Curious to know a couple of things about this if you could maybe dig in a bit...
/etc/dnsmasq.conf
I just noticed you changed your dnsmasq cache size in /etc/dnsmasq.conf. You should try removing this option cachesize '1000' line (and removing the --max-procs= value) and see if the problem still occurs.
Router is Netgear R7800:
root@R7800:~# ubus call system board
{
"kernel": "5.4.106",
"hostname": "R7800",
"system": "ARMv7 Processor rev 0 (v7l)",
"model": "Netgear Nighthawk X4S R7800",
"board_name": "netgear,r7800",
"release": {
"distribution": "OpenWrt",
"version": "SNAPSHOT",
"revision": "r16345-d71424a085",
"target": "ipq806x/generic",
"description": "OpenWrt SNAPSHOT r16345-d71424a085"
}
}
root@R7800:~# cat /etc/dnsmasq.conf
# Change the following lines if you want dnsmasq to serve SRV
# records.
# You may add multiple srv-host lines.
# The fields are <name>,<target>,<port>,<priority>,<weight>
# A SRV record sending LDAP for the example.com domain to
# ldapserver.example.com port 289
#srv-host=_ldap._tcp.example.com,ldapserver.example.com,389
# Two SRV records for LDAP, each with different priorities
#srv-host=_ldap._tcp.example.com,ldapserver.example.com,389,1
#srv-host=_ldap._tcp.example.com,ldapserver.example.com,389,2
# A SRV record indicating that there is no LDAP server for the domain
# example.com
#srv-host=_ldap._tcp.example.com
# The following line shows how to make dnsmasq serve an arbitrary PTR
# record. This is useful for DNS-SD.
# The fields are <name>,<target>
#ptr-record=_http._tcp.dns-sd-services,"New Employee Page._http._tcp.dns-sd-services"
# Change the following lines to enable dnsmasq to serve TXT records.
# These are used for things like SPF and zeroconf.
# The fields are <name>,<text>,<text>...
#Example SPF.
#txt-record=example.com,"v=spf1 a -all"
#Example zeroconf
#txt-record=_http._tcp.example.com,name=value,paper=A4
# Provide an alias for a "local" DNS name. Note that this _only_ works
# for targets which are names from DHCP or /etc/hosts. Give host
# "bert" another name, bertrand
# The fields are <cname>,<target>
#cname=bertand,bert
#max-procs=1
root@R7800:~#
Below memory usage after commenting out option cachesize '1000' and reboot:
root@R7800:~# free -m
total used free shared buff/cache available
Mem: 444176 133436 257800 12472 52940 253460
Swap: 0 0 0
Notes:
Tue Mar 30 20:22:53 2021 user.info adblock-4.1.0[1278]: adblock instance started ::: action: start, priority: 0, pid: 1278
Tue Mar 30 20:24:15 2021 user.info adblock-4.1.0[1278]: blocklist with overall 309334 blocked domains loaded successfully (Netgear Nighthawk X4S R7800, OpenWrt SNAPSHOT r16345-d71424a085)
[ 0.000000] Kernel command line: mem=0x1C000000 ramoops.mem_address=0x5F000000 ramoops.mem_size=0x2C000 ramoops.record_size=0x4000
[ 0.018995] ramoops: using module parameters
[ 0.019360] pstore: Registered ramoops as persistent store backend
[ 0.019378] ramoops: using 0x2c000@0x5f000000, ecc: 0
For below testing of dnsmasq oom I used netcat as when using Taxi App oo-reaper clears all the extra dnsmasq processes and memory consumption returns normal.
Mem after 1st netcat -t 127.0.0.1 53 &
root@R7800:~# free -m
total used free shared buff/cache available
Mem: 444176 185020 206048 12472 53108 201792
Swap: 0 0 0
Mem after 2nd netcat -t 127.0.0.1 53 &
root@R7800:~# free -m
total used free shared buff/cache available
Mem: 444176 232116 158928 12472 53132 154684
Swap: 0 0 0
Mem after 3rd netcat -t 127.0.0.1 53 &
root@R7800:~# free -m
total used free shared buff/cache available
Mem: 444176 283340 107692 12472 53144 103456
Swap: 0 0 0
Mem after 4th netcat -t 127.0.0.1 53 &
root@R7800:~# free -m
total used free shared buff/cache available
Mem: 444176 338756 52232 12472 53188 48016
Swap: 0 0 0
Mem after 5th netcat -t 127.0.0.1 53 &
root@R7800:~# free -m
total used free shared buff/cache available
Mem: 444176 386996 26696 12472 30484 11088
Swap: 0 0 0
Mem after 6th netcat -t 127.0.0.1 53 & --> dnsmasq oom
root@R7800:~# free -m
total used free shared buff/cache available
Mem: 444176 389360 29004 12472 25812 11100
Swap: 0 0 0
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.820556] dnsmasq invoked oom-killer: gfp_mask=0x100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=0
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.820590] CPU: 0 PID: 9121 Comm: dnsmasq Not tainted 5.4.106 #0
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.829094] Hardware name: Generic DT based system
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.835182] [<c0311068>] (unwind_backtrace) from [<c030c4e0>] (show_stack+0x14/0x20)
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.839867] [<c030c4e0>] (show_stack) from [<c0923098>] (dump_stack+0x94/0xa8)
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.847768] [<c0923098>] (dump_stack) from [<c0422338>] (dump_header+0x54/0x1a8)
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.854794] [<c0422338>] (dump_header) from [<c0422bb4>] (oom_kill_process+0x190/0x194)
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.862347] [<c0422bb4>] (oom_kill_process) from [<c04235c8>] (out_of_memory+0x268/0x324)
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.870076] [<c04235c8>] (out_of_memory) from [<c0467dd8>] (__alloc_pages_nodemask+0xb9c/0x1260)
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.878410] [<c0467dd8>] (__alloc_pages_nodemask) from [<c044e8f4>] (wp_page_copy+0x64/0x77c)
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.887262] [<c044e8f4>] (wp_page_copy) from [<c04513a8>] (do_wp_page+0xb0/0x5b0)
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.895678] [<c04513a8>] (do_wp_page) from [<c04529a0>] (handle_mm_fault+0x64c/0xb6c)
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.903147] [<c04529a0>] (handle_mm_fault) from [<c0311fd4>] (do_page_fault+0x124/0x2c4)
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.910960] [<c0311fd4>] (do_page_fault) from [<c0312328>] (do_DataAbort+0x48/0xd4)
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.919117] [<c0312328>] (do_DataAbort) from [<c0301ddc>] (__dabt_usr+0x3c/0x40)
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.926492] Exception stack(0xda22dfb0 to 0xda22dff8)
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.934132] dfa0: 00000000 00000000 04145f10 ffffffff
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.939089] dfc0: 00000000 004b2f58 00000026 00000000 004b2f58 004b2fa0 004b2f3c 05425990
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.947245] dfe0: bef34b20 bef34b60 00482f84 0048311c 20000010 ffffffff
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.955529] Mem-Info:
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.961836] active_anon:83316 inactive_anon:770 isolated_anon:0
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.961836] active_file:14 inactive_file:50 isolated_file:1
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.961836] unevictable:0 dirty:1 writeback:3 unstable:0
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.961836] slab_reclaimable:1994 slab_unreclaimable:3315
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.961836] mapped:3 shmem:3118 pagetables:336 bounce:0
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.961836] free:4015 free_pcp:33 free_cma:0
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.974227] Node 0 active_anon:333264kB inactive_anon:3080kB active_file:92kB inactive_file:200kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:12kB dirty:4kB writeback:8kB shmem:12472kB writeback_tmp:0kB unstable:0kB all_unreclaimable? yes
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1760.996533] Normal free:16060kB min:16384kB low:20480kB high:24576kB active_anon:332796kB inactive_anon:3080kB active_file:40kB inactive_file:284kB unevictable:0kB writepending:12kB present:458752kB managed:444176kB mlocked:0kB kernel_stack:856kB pagetables:1344kB bounce:0kB free_pcp:132kB local_pcp:0kB free_cma:0kB
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1761.024640] lowmem_reserve[]: 0 0 0
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1761.046894] Normal: 165*4kB (UE) 119*8kB (UME) 43*16kB (UE) 12*32kB (UE) 17*64kB (UE) 19*128kB (UME) 5*256kB (UE) 1*512kB (M) 0*1024kB 2*2048kB (UE) 1*4096kB (M) = 16188kB
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1761.050128] 3199 total pagecache pages
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1761.065440] 0 pages in swap cache
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1761.069211] Swap cache stats: add 0, delete 0, find 0/0
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1761.072579] Free swap = 0kB
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1761.077674] Total swap = 0kB
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1761.080738] 114688 pages RAM
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1761.083671] 0 pages HighMem/MovableOnly
Tue Mar 30 20:50:39 2021 kern.warn kernel: [ 1761.086466] 3644 pages reserved
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.090041] Tasks state (memory values in pages):
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.093168] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.098087] [ 190] 81 190 260 23 10240 0 0 ubusd
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.106606] [ 191] 0 191 176 10 6144 0 0 askfirst
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.114853] [ 235] 0 235 204 12 6144 0 0 urngd
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.123283] [ 614] 514 614 267 42 10240 0 0 logd
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.131412] [ 615] 0 615 293 23 8192 0 0 logread
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.139564] [ 667] 0 667 500 64 12288 0 0 rpcd
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.147655] [ 736] 323 736 252 33 8192 0 0 chronyd
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.155996] [ 954] 0 954 215 11 6144 0 0 dropbear
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.164056] [ 1052] 0 1052 1027 68 12288 0 0 hostapd
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.172675] [ 1053] 0 1053 1003 51 12288 0 0 wpa_supplicant
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.180811] [ 1115] 0 1115 393 37 8192 0 0 netifd
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.189829] [ 1311] 0 1311 211 14 6144 0 0 odhcp6c
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.198076] [ 1336] 0 1336 270 10 8192 0 0 udhcpc
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.206324] [ 1462] 0 1462 315 31 6144 0 0 odhcpd
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.214665] [ 1626] 0 1626 271 10 8192 0 0 crond
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.222848] [ 1813] 0 1813 1016 152 12288 0 0 uhttpd
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.231161] [ 2000] 0 2000 1045 160 10240 0 0 collectd
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.239313] [ 2089] 65534 2089 1043 317 12288 0 0 https-dns-proxy
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.247904] [ 2090] 65534 2090 1080 353 14336 0 0 https-dns-proxy
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.256683] [ 4161] 453 4161 13047 12443 61440 0 0 dnsmasq
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.265711] [ 4536] 0 4536 229 22 8192 0 0 dropbear
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.274052] [ 4555] 0 4555 272 13 8192 0 0 ash
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.282659] [ 8868] 0 8868 185 15 8192 0 0 netcat
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.290454] [ 8869] 453 8869 13064 12444 61440 0 0 dnsmasq
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.298764] [ 8883] 0 8883 185 15 8192 0 0 netcat
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.307011] [ 8884] 453 8884 13064 12444 61440 0 0 dnsmasq
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.315352] [ 8890] 0 8890 185 15 8192 0 0 netcat
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.323600] [ 8891] 453 8891 13064 12444 61440 0 0 dnsmasq
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.331878] [ 8900] 0 8900 185 15 8192 0 0 netcat
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.340187] [ 8901] 453 8901 13064 12444 61440 0 0 dnsmasq
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.348528] [ 9046] 0 9046 185 15 10240 0 0 netcat
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.356776] [ 9047] 453 9047 13064 12444 61440 0 0 dnsmasq
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.365087] [ 9120] 0 9120 185 15 10240 0 0 netcat
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.373282] [ 9121] 453 9121 13047 12442 61440 0 0 dnsmasq
Tue Mar 30 20:50:39 2021 kern.info kernel: [ 1761.381671] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/,task=dnsmasq,pid=9047,uid=453
Tue Mar 30 20:50:39 2021 kern.err kernel: [ 1761.389935] Out of memory: Killed process 9047 (dnsmasq) total-vm:52256kB, anon-rss:49776kB, file-rss:0kB, shmem-rss:0kB, UID:453 pgtables:60kB oom_score_adj:0
and if you'd do the same with the block list disabled/removed ?
I'm curious if it creates a full copy of the block list in RAM, for every child is starts.
Seems like it does.
Memory usage after disabling adblock.
root@R7800:~# free -m
total used free shared buff/cache available
Mem: 444176 86876 329344 288 27956 318604
Swap: 0 0 0
Memory usage after max 20 dnsmasq instances running and cannot oom:
root@R7800:~# free -m
total used free shared buff/cache available
Mem: 444176 89320 326792 288 28064 316104
Swap: 0 0 0
root@R7800:~# ps |grep dnsmasq
13232 dnsmasq 2564 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
13832 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
13916 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
13918 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
13920 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
13922 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
13931 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
13933 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
13940 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
14032 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
14039 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
14041 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
14043 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
14045 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
14047 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
14056 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
14058 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
14065 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
14067 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
14163 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
14228 dnsmasq 2632 S /usr/sbin/dnsmasq -C /var/etc/dnsmasq.conf.cfg01411c -k -x /var/run/dnsmasq/dnsmasq.cfg01411c.pid
14253 root 1080 R grep dnsmasq
root@R7800:~#
Ok,
ideally the children would use the dns buffer from the mother, but it seems they don't 
Work as designed I'm sure, but in this case the culprit is the huge block list of yours.
Based on your first test, you shouldn't let it create more than 4 or 5 childs.
Not sure in what way the conclusion helps you thought 
Heh... I'll use patch as long as it's working as cannot replace the Taxi App.
And still going to use the adblock as well as that's one of the main apps in Openwrt for my use case.
Anyhow this is kind of a border case unless DNS over TCP usage will grow and others will start facing similar issues.
Are those TCP queries really important?
Can the client failover to UDP if you reject DNS over TCP?
Perhaps you should just reject TCP queries from that specific client, or reject them entirely?
Otherwise, consider to use 2 Dnsmasq instances.
The second instance can be lightweight running without Adblock.
You can redirect TCP queries or all queries from that client to the second instance.
I would be interested to know if running "sysctl -w vm.overcommit_memory=1" reduces the instances of OOM killer.
That's a food for thought...
To be noted, ultimately I can just disable mobile wireless and use mobile data for Taxi App whenever I need it (as did before all the findings in this thread).
When I let the TCP:53 through and the App works, it seems like it is resolving required addresses later using IPv6 UDP DNS.
So I really don't understand for what is this App using the hardcoded IPv4 DNS query over TCP to google DNS server. Seems it's only SYN/ACK/FIN ACK msg in-between and no data, but then I don't know what to expect in this communication...
You have posted the TCP SYN and RST captures, but not the actual query.
Is this really a DNS query and not just a workaround to check internet connectivity?
Try to capture and extract specifically the DNS query message if any.
Keeping all the above config the same when Taxi App "works", unfortunately dnsmasq will still Oom.
root@R7800:~# date
Wed Mar 31 23:16:12 +08 2021
root@R7800:~# sysctl -w vm.overcommit_memory=1
vm.overcommit_memory = 1
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.816450] dnsmasq invoked oom-killer: gfp_mask=0x100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.816483] CPU: 0 PID: 29692 Comm: dnsmasq Not tainted 5.4.106 #0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.824986] Hardware name: Generic DT based system
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.831077] [<c0311068>] (unwind_backtrace) from [<c030c4e0>] (show_stack+0x14/0x20)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.835850] [<c030c4e0>] (show_stack) from [<c0923098>] (dump_stack+0x94/0xa8)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.843751] [<c0923098>] (dump_stack) from [<c0422338>] (dump_header+0x54/0x1a8)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.850777] [<c0422338>] (dump_header) from [<c0422bb4>] (oom_kill_process+0x190/0x194)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.858328] [<c0422bb4>] (oom_kill_process) from [<c04235c8>] (out_of_memory+0x268/0x324)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.866058] [<c04235c8>] (out_of_memory) from [<c0467dd8>] (__alloc_pages_nodemask+0xb9c/0x1260)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.874390] [<c0467dd8>] (__alloc_pages_nodemask) from [<c044e8f4>] (wp_page_copy+0x64/0x77c)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.883243] [<c044e8f4>] (wp_page_copy) from [<c04513a8>] (do_wp_page+0xb0/0x5b0)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.891662] [<c04513a8>] (do_wp_page) from [<c04529a0>] (handle_mm_fault+0x64c/0xb6c)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.899129] [<c04529a0>] (handle_mm_fault) from [<c0311fd4>] (do_page_fault+0x124/0x2c4)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.906941] [<c0311fd4>] (do_page_fault) from [<c0312328>] (do_DataAbort+0x48/0xd4)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.915099] [<c0312328>] (do_DataAbort) from [<c0301ddc>] (__dabt_usr+0x3c/0x40)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.922473] Exception stack(0xd559ffb0 to 0xd559fff8)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.930113] ffa0: 00000000 00000000 03639fa0 ffffffff
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.935070] ffc0: 00000000 00532f58 00000026 00000000 00532f58 00532fa0 00532f3c 04fb9ba0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.943227] ffe0: be8ccb20 be8ccb60 00502f84 0050311c 20000010 ffffffff
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.951538] Mem-Info:
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.957887] active_anon:84821 inactive_anon:772 isolated_anon:0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.957887] active_file:44 inactive_file:82 isolated_file:35
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.957887] unevictable:0 dirty:76 writeback:0 unstable:0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.957887] slab_reclaimable:2014 slab_unreclaimable:3414
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.957887] mapped:18 shmem:3380 pagetables:402 bounce:0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.957887] free:3965 free_pcp:0 free_cma:0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.970182] Node 0 active_anon:339284kB inactive_anon:3088kB active_file:332kB inactive_file:252kB unevictable:0kB isolated(anon):0kB isolated(file):12kB mapped:72kB dirty:304kB writeback:0kB shmem:13520kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5242.993020] Normal free:15860kB min:16384kB low:20480kB high:24576kB active_anon:339208kB inactive_anon:3088kB active_file:88kB inactive_file:464kB unevictable:0kB writepending:304kB present:458752kB managed:444176kB mlocked:0kB kernel_stack:840kB pagetables:1608kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.021065] lowmem_reserve[]: 0 0 0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.043276] Normal: 89*4kB (UME) 28*8kB (UME) 14*16kB (UME) 20*32kB (UME) 10*64kB (UE) 4*128kB (UE) 9*256kB (U) 15*512kB (UM) 3*1024kB (UM) 0*2048kB 0*4096kB = 15652kB
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.046441] 3547 total pagecache pages
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.061427] 0 pages in swap cache
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.065175] Swap cache stats: add 0, delete 0, find 0/0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.068612] Free swap = 0kB
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.073595] Total swap = 0kB
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.076718] 114688 pages RAM
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.079639] 0 pages HighMem/MovableOnly
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.082449] 3644 pages reserved
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.086007] Tasks state (memory values in pages):
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.089200] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.094012] [ 189] 81 189 262 24 8192 0 0 ubusd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.102574] [ 190] 0 190 176 10 8192 0 0 askfirst
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.110820] [ 234] 0 234 204 12 8192 0 0 urngd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.119318] [ 613] 514 613 268 43 8192 0 0 logd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.127421] [ 614] 0 614 293 23 10240 0 0 logread
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.135496] [ 666] 0 666 500 64 10240 0 0 rpcd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.143622] [ 735] 323 735 252 33 10240 0 0 chronyd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.151963] [ 953] 0 953 215 11 6144 0 0 dropbear
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.160054] [ 1051] 0 1051 1027 68 12288 0 0 hostapd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.168708] [ 1052] 0 1052 1003 51 10240 0 0 wpa_supplicant
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.176730] [ 1114] 0 1114 393 37 12288 0 0 netifd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.185827] [ 1266] 0 1266 313 30 10240 0 0 odhcpd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.194076] [ 1362] 0 1362 270 10 8192 0 0 udhcpc
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.202324] [ 1391] 0 1391 211 14 8192 0 0 odhcp6c
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.210569] [ 1490] 0 1490 271 10 8192 0 0 crond
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.218816] [ 1577] 0 1577 1077 213 10240 0 0 uhttpd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.227077] [ 1808] 0 1808 1059 174 14336 0 0 collectd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.235312] [ 2006] 65534 2006 996 227 12288 0 0 https-dns-proxy
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.243902] [ 2007] 65534 2007 873 154 10240 0 0 https-dns-proxy
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.252649] [ 4846] 0 4846 229 22 10240 0 0 dropbear
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.261678] [ 4866] 0 4866 272 13 10240 0 0 ash
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.270363] [ 15537] 453 15537 13137 12532 61440 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.278080] [ 29686] 453 29686 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.286364] [ 29687] 453 29687 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.294762] [ 29688] 453 29688 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.303102] [ 29689] 453 29689 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.311413] [ 29690] 453 29690 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.319753] [ 29691] 453 29691 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.328094] [ 29692] 453 29692 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.336365] [ 29693] 453 29693 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.344745] [ 29694] 453 29694 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.353083] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/,task=dnsmasq,pid=15537,uid=453
Wed Mar 31 23:18:02 2021 kern.err kernel: [ 5243.361436] Out of memory: Killed process 15537 (dnsmasq) total-vm:52548kB, anon-rss:50124kB, file-rss:4kB, shmem-rss:0kB, UID:453 pgtables:60kB oom_score_adj:0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.374667] ath10k_pci 0000:01:00.0: SWBA overrun on vdev 0, skipped old beacon
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.388813] ath10k_pci 0000:01:00.0: SWBA overrun on vdev 0, skipped old beacon
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.406714] oom_reaper: reaped process 15537 (dnsmasq), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.407296] ath10k_pci 0001:01:00.0: SWBA overrun on vdev 0, skipped old beacon
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.414951] ath10k_pci 0001:01:00.0: SWBA overrun on vdev 0, skipped old beacon
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.422146] ath10k_pci 0001:01:00.0: SWBA overrun on vdev 0, skipped old beacon
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.547286] dnsmasq invoked oom-killer: gfp_mask=0x100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.547319] CPU: 0 PID: 29692 Comm: dnsmasq Not tainted 5.4.106 #0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.555822] Hardware name: Generic DT based system
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.561915] [<c0311068>] (unwind_backtrace) from [<c030c4e0>] (show_stack+0x14/0x20)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.566684] [<c030c4e0>] (show_stack) from [<c0923098>] (dump_stack+0x94/0xa8)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.574590] [<c0923098>] (dump_stack) from [<c0422338>] (dump_header+0x54/0x1a8)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.581614] [<c0422338>] (dump_header) from [<c0422bb4>] (oom_kill_process+0x190/0x194)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.589165] [<c0422bb4>] (oom_kill_process) from [<c04235c8>] (out_of_memory+0x268/0x324)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.596905] [<c04235c8>] (out_of_memory) from [<c0467dd8>] (__alloc_pages_nodemask+0xb9c/0x1260)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.605226] [<c0467dd8>] (__alloc_pages_nodemask) from [<c041df0c>] (pagecache_get_page+0x120/0x34c)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.614078] [<c041df0c>] (pagecache_get_page) from [<c041e708>] (filemap_fault+0x5d0/0x94c)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.623194] [<c041e708>] (filemap_fault) from [<c044e6b8>] (__do_fault+0x40/0x12c)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.631265] [<c044e6b8>] (__do_fault) from [<c0452b3c>] (handle_mm_fault+0x7e8/0xb6c)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.638907] [<c0452b3c>] (handle_mm_fault) from [<c0311fd4>] (do_page_fault+0x124/0x2c4)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.646805] [<c0311fd4>] (do_page_fault) from [<c03123fc>] (do_PrefetchAbort+0x48/0xa4)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.654964] [<c03123fc>] (do_PrefetchAbort) from [<c0302088>] (ret_from_exception+0x0/0x18)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.662686] Exception stack(0xd559ffb0 to 0xd559fff8)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.671019] ffa0: 00000000 00000000 03551fa0 ffffffff
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.676236] ffc0: 00000000 00532f58 00000026 00000000 00532f58 00532fa0 00532f3c 04fb9ba0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.684394] ffe0: be8ccb20 be8ccb60 00502f84 0050311c 20000010 ffffffff
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.692746] Mem-Info:
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.699045] active_anon:84540 inactive_anon:772 isolated_anon:0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.699045] active_file:38 inactive_file:28 isolated_file:0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.699045] unevictable:0 dirty:66 writeback:2 unstable:0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.699045] slab_reclaimable:2003 slab_unreclaimable:3415
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.699045] mapped:16 shmem:3380 pagetables:367 bounce:0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.699045] free:3987 free_pcp:80 free_cma:0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.711367] Node 0 active_anon:338184kB inactive_anon:3088kB active_file:108kB inactive_file:116kB unevictable:0kB isolated(anon):0kB isolated(file):48kB mapped:32kB dirty:260kB writeback:12kB shmem:13520kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.734188] Normal free:16272kB min:16384kB low:20480kB high:24576kB active_anon:338124kB inactive_anon:3088kB active_file:156kB inactive_file:0kB unevictable:0kB writepending:272kB present:458752kB managed:444176kB mlocked:0kB kernel_stack:832kB pagetables:1468kB bounce:0kB free_pcp:320kB local_pcp:12kB free_cma:0kB
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.762298] lowmem_reserve[]: 0 0 0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.784539] Normal: 128*4kB (UME) 53*8kB (UME) 27*16kB (UME) 30*32kB (UME) 11*64kB (UME) 4*128kB (UE) 11*256kB (UM) 14*512kB (U) 3*1024kB (UM) 0*2048kB 0*4096kB = 16600kB
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.787945] 3467 total pagecache pages
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.803191] 0 pages in swap cache
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.806862] Swap cache stats: add 0, delete 0, find 0/0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.810312] Free swap = 0kB
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.815280] Total swap = 0kB
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.818465] 114688 pages RAM
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.821269] 0 pages HighMem/MovableOnly
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5243.824133] 3644 pages reserved
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.827744] Tasks state (memory values in pages):
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.830821] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.835702] [ 189] 81 189 262 24 8192 0 0 ubusd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.844276] [ 190] 0 190 176 10 8192 0 0 askfirst
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.852521] [ 234] 0 234 204 12 8192 0 0 urngd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.861020] [ 613] 514 613 268 43 8192 0 0 logd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.869080] [ 614] 0 614 293 23 10240 0 0 logread
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.877232] [ 666] 0 666 500 64 10240 0 0 rpcd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.885257] [ 735] 323 735 252 33 10240 0 0 chronyd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.893664] [ 953] 0 953 215 11 6144 0 0 dropbear
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.901725] [ 1051] 0 1051 1027 68 12288 0 0 hostapd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.910409] [ 1052] 0 1052 1003 51 10240 0 0 wpa_supplicant
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.918468] [ 1114] 0 1114 393 37 12288 0 0 netifd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.927497] [ 1266] 0 1266 313 30 10240 0 0 odhcpd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.935691] [ 1362] 0 1362 270 10 8192 0 0 udhcpc
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.943992] [ 1391] 0 1391 211 14 8192 0 0 odhcp6c
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.952238] [ 1490] 0 1490 271 10 8192 0 0 crond
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.960487] [ 1577] 0 1577 1077 213 10240 0 0 uhttpd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.968828] [ 1808] 0 1808 1059 174 14336 0 0 collectd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.976923] [ 2006] 65534 2006 996 227 12288 0 0 https-dns-proxy
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.985572] [ 2007] 65534 2007 873 154 10240 0 0 https-dns-proxy
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5243.994350] [ 4846] 0 4846 229 22 10240 0 0 dropbear
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5244.003379] [ 4866] 0 4866 272 13 10240 0 0 ash
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5244.012067] [ 29686] 453 29686 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5244.019780] [ 29687] 453 29687 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5244.028121] [ 29688] 453 29688 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5244.036384] [ 29689] 453 29689 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5244.044772] [ 29690] 453 29690 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5244.053113] [ 29691] 453 29691 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5244.061454] [ 29692] 453 29692 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5244.069795] [ 29693] 453 29693 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5244.078105] [ 29694] 453 29694 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5244.086381] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/,task=dnsmasq,pid=29694,uid=453
Wed Mar 31 23:18:02 2021 kern.err kernel: [ 5244.094797] Out of memory: Killed process 29694 (dnsmasq) total-vm:52548kB, anon-rss:50124kB, file-rss:0kB, shmem-rss:0kB, UID:453 pgtables:58kB oom_score_adj:0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5244.108122] ath10k_pci 0000:01:00.0: SWBA overrun on vdev 0, skipped old beacon
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5244.122193] ath10k_pci 0000:01:00.0: SWBA overrun on vdev 0, skipped old beacon
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5244.124204] oom_reaper: reaped process 29694 (dnsmasq), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5244.129817] ath10k_pci 0001:01:00.0: SWBA overrun on vdev 0, skipped old beacon
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5244.145867] ath10k_pci 0001:01:00.0: SWBA overrun on vdev 0, skipped old beacon
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5244.152994] ath10k_pci 0001:01:00.0: SWBA overrun on vdev 0, skipped old beacon
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5245.887722] dnsmasq invoked oom-killer: gfp_mask=0x100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5245.887766] CPU: 0 PID: 29687 Comm: dnsmasq Not tainted 5.4.106 #0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5245.896265] Hardware name: Generic DT based system
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5245.902363] [<c0311068>] (unwind_backtrace) from [<c030c4e0>] (show_stack+0x14/0x20)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5245.907132] [<c030c4e0>] (show_stack) from [<c0923098>] (dump_stack+0x94/0xa8)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5245.915025] [<c0923098>] (dump_stack) from [<c0422338>] (dump_header+0x54/0x1a8)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5245.922052] [<c0422338>] (dump_header) from [<c0422bb4>] (oom_kill_process+0x190/0x194)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5245.929605] [<c0422bb4>] (oom_kill_process) from [<c04235c8>] (out_of_memory+0x268/0x324)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5245.937333] [<c04235c8>] (out_of_memory) from [<c0467dd8>] (__alloc_pages_nodemask+0xb9c/0x1260)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5245.945664] [<c0467dd8>] (__alloc_pages_nodemask) from [<c044e8f4>] (wp_page_copy+0x64/0x77c)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5245.954518] [<c044e8f4>] (wp_page_copy) from [<c04513a8>] (do_wp_page+0xb0/0x5b0)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5245.962935] [<c04513a8>] (do_wp_page) from [<c04529a0>] (handle_mm_fault+0x64c/0xb6c)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5245.970404] [<c04529a0>] (handle_mm_fault) from [<c0311fd4>] (do_page_fault+0x124/0x2c4)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5245.978216] [<c0311fd4>] (do_page_fault) from [<c0312328>] (do_DataAbort+0x48/0xd4)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5245.986374] [<c0312328>] (do_DataAbort) from [<c0301ddc>] (__dabt_usr+0x3c/0x40)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5245.993748] Exception stack(0xd4c09fb0 to 0xd4c09ff8)
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.001388] 9fa0: 00000000 00000000 02ea6f60 ffffffff
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.006345] 9fc0: 00000000 00532f58 00000026 00000000 00532f58 00532fa0 00532f3c 04fb9ba0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.014502] 9fe0: be8ccb20 be8ccb60 00502f84 0050311c 20000010 ffffffff
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.022821] Mem-Info:
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.029141] active_anon:84915 inactive_anon:772 isolated_anon:0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.029141] active_file:28 inactive_file:57 isolated_file:32
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.029141] unevictable:0 dirty:14 writeback:3 unstable:0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.029141] slab_reclaimable:2001 slab_unreclaimable:3415
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.029141] mapped:48 shmem:3380 pagetables:338 bounce:0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.029141] free:4019 free_pcp:0 free_cma:0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.041448] Node 0 active_anon:339660kB inactive_anon:3088kB active_file:112kB inactive_file:228kB unevictable:0kB isolated(anon):0kB isolated(file):128kB mapped:192kB dirty:56kB writeback:12kB shmem:13520kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.064629] Normal free:16076kB min:16384kB low:20480kB high:24576kB active_anon:339660kB inactive_anon:3088kB active_file:112kB inactive_file:228kB unevictable:0kB writepending:68kB present:458752kB managed:444176kB mlocked:0kB kernel_stack:832kB pagetables:1352kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.092489] lowmem_reserve[]: 0 0 0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.114730] Normal: 133*4kB (UME) 39*8kB (UME) 18*16kB (UME) 29*32kB (UME) 11*64kB (UE) 4*128kB (UE) 10*256kB (UM) 14*512kB (U) 3*1024kB (UM) 0*2048kB 0*4096kB = 16076kB
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.117948] 3496 total pagecache pages
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.133225] 0 pages in swap cache
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.136798] Swap cache stats: add 0, delete 0, find 0/0
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.140252] Free swap = 0kB
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.145216] Total swap = 0kB
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.148406] 114688 pages RAM
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.151205] 0 pages HighMem/MovableOnly
Wed Mar 31 23:18:02 2021 kern.warn kernel: [ 5246.154071] 3644 pages reserved
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.157685] Tasks state (memory values in pages):
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.160757] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.165631] [ 189] 81 189 262 24 8192 0 0 ubusd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.174183] [ 190] 0 190 176 10 8192 0 0 askfirst
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.182430] [ 234] 0 234 204 12 8192 0 0 urngd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.190959] [ 613] 514 613 268 43 8192 0 0 logd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.199019] [ 614] 0 614 293 23 10240 0 0 logread
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.207172] [ 666] 0 666 500 64 10240 0 0 rpcd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.215192] [ 735] 323 735 252 33 10240 0 0 chronyd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.223573] [ 953] 0 953 215 11 6144 0 0 dropbear
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.231664] [ 1051] 0 1051 1027 68 12288 0 0 hostapd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.240349] [ 1052] 0 1052 1003 51 10240 0 0 wpa_supplicant
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.248409] [ 1114] 0 1114 393 37 12288 0 0 netifd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.257437] [ 1266] 0 1266 313 30 10240 0 0 odhcpd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.265625] [ 1362] 0 1362 270 10 8192 0 0 udhcpc
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.273932] [ 1391] 0 1391 211 45 8192 0 0 odhcp6c
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.282179] [ 1490] 0 1490 271 26 8192 0 0 crond
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.290427] [ 1577] 0 1577 1077 213 10240 0 0 uhttpd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.298768] [ 1808] 0 1808 1059 174 14336 0 0 collectd
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.306858] [ 2006] 65534 2006 996 227 12288 0 0 https-dns-proxy
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.315513] [ 2007] 65534 2007 873 154 10240 0 0 https-dns-proxy
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.324291] [ 4846] 0 4846 229 22 10240 0 0 dropbear
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.333319] [ 4866] 0 4866 272 13 10240 0 0 ash
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.341976] [ 29686] 453 29686 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.349721] [ 29687] 453 29687 13137 12547 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.358061] [ 29688] 453 29688 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.366320] [ 29689] 453 29689 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.374714] [ 29690] 453 29690 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.383053] [ 29691] 453 29691 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.391395] [ 29692] 453 29692 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.399704] [ 29693] 453 29693 13137 12531 59392 0 0 dnsmasq
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.408043] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/,task=dnsmasq,pid=29687,uid=453
Wed Mar 31 23:18:02 2021 kern.err kernel: [ 5246.416335] Out of memory: Killed process 29687 (dnsmasq) total-vm:52548kB, anon-rss:50124kB, file-rss:64kB, shmem-rss:0kB, UID:453 pgtables:58kB oom_score_adj:0
Wed Mar 31 23:18:02 2021 kern.info kernel: [ 5246.436459] oom_reaper: reaped process 29687 (dnsmasq), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
root@R7800:~# date
Wed Mar 31 23:18:07 +08 2021
root@R7800:~# sysctl vm.overcommit_memory
vm.overcommit_memory = 1
I suspect this might be the case as I cannot find any address query from message transfers between the mobile and google DNS server.
--> Any advise what should I look for as an actual "DNS query" msg when using DNS over TCP?
Capturing DNS over TCP:
# Client command
dig -q google.com @8.8.8.8 +vc
nslookup -vc google.com 8.8.8.8
# Wireshark > Filter
dns && tcp
# Wireshark > Packet Details
Frame ...
Linux cooked capture ...
Internet Protocol ...
Transmission Control Protocol ...
Domain Name System (query)
Length: 28
Transaction ID: 0x0928
Flags: 0x0100 Standard query
Questions: 1
Answer RRs: 0
Authority RRs: 0
Additional RRs: 0
Queries
google.com: type A, class IN
Name: google.com
[Name Length: 10]
[Label Count: 2]
Type: A (Host Address) (1)
Class: IN (0x0001)
[Response In: 31995]
Possible workaround for OpenWrt:
uci -q delete firewall.dns_tcp
uci set firewall.dns_tcp="redirect"
uci set firewall.dns_tcp.name="Dummy-DNS+TCP"
uci set firewall.dns_tcp.src="lan"
uci set firewall.dns_tcp.src_dip="8.8.8.8"
uci set firewall.dns_tcp.src_dport="53"
uci set firewall.dns_tcp.dest_port="80"
uci set firewall.dns_tcp.proto="tcp"
uci set firewall.dns_tcp.target="DNAT"
uci reorder firewall.dns_tcp="0"
uci commit firewall
/etc/init.d/firewall restart
You can limit the rule scope to a specific MAC address and/or redirect it as-is to a public DNS.
Thanks for trying that. I'll go back to the drawing board 
Thanks for the above. Can confirm I can filter and find TCP DNS query.
Also can confirm there's no DNS query in messages from mobile to TCP 8.8.8.8:53 when using Taxi App. So most likely it's used for kind of a connectivity check as you suspected as no real data is transferred in between.
As for the possible firewall rule workaround, seems it doesn't have effect when I'm using https-dns-proxy. It hits https-dns-proxy own firewall rule before;
For the sake of testing and understanding, I stopped https-dns-proxy and set dns manually to 1.1.1.1 in /etc/config/dhcp.
Now it hits the firewall rule and it is working.
Question:
Why it works when forwarding request to port 80 (uhttpd) but when forwarding the same request to port 53 (dnsmasq, and the rule below it) it does not work at all ("Oops! You're Offline") ?
The iptables targets such as DNAT and REDIRECT are terminating in the current chain.
If traffic matches the first rule, it won't be processed by the following rules in the chain.
You can disable the automatic redirects that mess your rule order:
uci set https-dns-proxy.config.force_dns="0"
uci commit https-dns-proxy
/etc/init.d/https-dns-proxy restart
And set up a manual redirect instead:
https://openwrt.org/docs/guide-user/firewall/fw3_configurations/intercept_dns
uHTTPd should process those connections more gracefully compared to Dnsmasq.
Apparently it has no need to fork or consume too much RAM to load blocklists.
Noted with thanks. Will try later.
Edit:
Am I able to see current parameter value for https-dns-proxy.config.force_dns parameter?
I cannot find just by uci show command.
Check out the default settings:
Thanks for pointing out. Seem I had an old config from https://docs.openwrt.melmac.net/https-dns-proxy/ that did not have that option force_dns line.
I added it and set it to '0' in the config and got rid of the related firewall rules.
Thanks once again.