I've been running 17.01.4 for a couple weeks now, and I'm seeing occasional kernel warning/stack backtraces, plus a hang/reboot/something weird just now while doing a large download (internet->wifi client). The download is restarted and running now, but I'm seeing warnings like this:
Sun Mar 4 11:31:26 2018 kern.warn kernel: [ 2007.521605] ------------[ cut here ]------------
Sun Mar 4 11:31:26 2018 kern.warn kernel: [ 2007.528283] WARNING: CPU: 0 PID: 3 at net/sched/sch_hfsc.c:1426 hfsc_dequeue+0x188/0x568 [sch_hfsc]()
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.533013] Modules linked in: ifb pppoe ppp_async iptable_nat pppox ppp_generic nf_nat_ipv4 nf_conntrack_ipv6 nf_conntrack_ipv4 ipt_REJECT ipt_MASQUERADE xt_time xt_tcpudp xt_tcpmss xt_statistic xt_state xt_recent xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_helper xt_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_HL xt_DSCP xt_CLASSIFY usblp ums_usbat ums_sddr55 ums_sddr09 ums_karma Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.656877] CPU: 0 PID: 3 Comm: ksoftirqd/0 Tainted: G W 4.4.92 #0
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.656968] Hardware name: Qualcomm (Flattened Device Tree)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.664105] [<c02207c4>] (unwind_backtrace) from [<c021d258>] (show_stack+0x14/0x20)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.669657] [<c021d258>] (show_stack) from [<c03bd380>] (dump_stack+0x8c/0xa0)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.677642] [<c03bd380>] (dump_stack) from [<c0228b88>] (warn_slowpath_common+0xa4/0xd0)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.684669] [<c0228b88>] (warn_slowpath_common) from [<c0228c68>] (warn_slowpath_null+0x1c/0x24)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.692930] [<c0228c68>] (warn_slowpath_null) from [<bf282490>] (hfsc_dequeue+0x188/0x568 [sch_hfsc])
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.701702] [<bf282490>] (hfsc_dequeue [sch_hfsc]) from [<c0532950>] (__qdisc_run+0xcc/0x1b4)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.710800] [<c0532950>] (__qdisc_run) from [<c0510120>] (net_tx_action+0xf4/0x180)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.719306] [<c0510120>] (net_tx_action) from [<c022bd84>] (__do_softirq+0xdc/0x230)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.726769] [<c022bd84>] (__do_softirq) from [<c022bf0c>] (run_ksoftirqd+0x34/0x64)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.734758] [<c022bf0c>] (run_ksoftirqd) from [<c024698c>] (smpboot_thread_fn+0x190/0x1b8)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.742139] [<c024698c>] (smpboot_thread_fn) from [<c0243aec>] (kthread+0xf8/0x100)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.750469] [<c0243aec>] (kthread) from [<c0209cb8>] (ret_from_fork+0x14/0x3c)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.758096] ---[ end trace 70b2df21d1202634 ]---
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.766032] ath10k_pci 0001:01:00.0: SWBA overrun on vdev 0, skipped old beacon
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.770182] ath10k_pci 0001:01:00.0: SWBA overrun on vdev 1, skipped old beacon
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.777134] ath10k_pci 0001:01:00.0: SWBA overrun on vdev 0, skipped old beacon
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.784525] ath10k_pci 0001:01:00.0: SWBA overrun on vdev 1, skipped old beacon
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.791795] ath10k_pci 0001:01:00.0: SWBA overrun on vdev 0, skipped old beacon
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.799118] ath10k_pci 0001:01:00.0: SWBA overrun on vdev 1, skipped old beacon
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.806299] ath10k_pci 0001:01:00.0: SWBA overrun on vdev 0, skipped old beacon
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.813671] ath10k_pci 0001:01:00.0: SWBA overrun on vdev 1, skipped old beacon
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.821255] ------------[ cut here ]------------
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.828279] WARNING: CPU: 1 PID: 2387 at net/sched/sch_hfsc.c:1426 hfsc_dequeue+0x188/0x568 [sch_hfsc]()
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.833017] Modules linked in: ifb pppoe ppp_async iptable_nat pppox ppp_generic nf_nat_ipv4 nf_conntrack_ipv6 nf_conntrack_ipv4 ipt_REJECT ipt_MASQUERADE xt_time xt_tcpudp xt_tcpmss xt_statistic xt_state xt_recent xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_helper xt_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_HL xt_DSCP xt_CLASSIFY usblp ums_usbat ums_sddr55 ums_sddr09 ums_karma Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.957144] CPU: 1 PID: 2387 Comm: logread Tainted: G W 4.4.92 #0
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.957232] Hardware name: Qualcomm (Flattened Device Tree)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.964371] [<c02207c4>] (unwind_backtrace) from [<c021d258>] (show_stack+0x14/0x20)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.969840] [<c021d258>] (show_stack) from [<c03bd380>] (dump_stack+0x8c/0xa0)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.977823] [<c03bd380>] (dump_stack) from [<c0228b88>] (warn_slowpath_common+0xa4/0xd0)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.984850] [<c0228b88>] (warn_slowpath_common) from [<c0228c68>] (warn_slowpath_null+0x1c/0x24)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2007.993114] [<c0228c68>] (warn_slowpath_null) from [<bf282490>] (hfsc_dequeue+0x188/0x568 [sch_hfsc])
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.001889] [<bf282490>] (hfsc_dequeue [sch_hfsc]) from [<c0532950>] (__qdisc_run+0xcc/0x1b4)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.010985] [<c0532950>] (__qdisc_run) from [<c0514e6c>] (__dev_queue_xmit+0x30c/0x56c)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.019493] [<c0514e6c>] (__dev_queue_xmit) from [<bf2b071c>] (tcf_mirred+0x1a4/0x1ec [act_mirred])
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.027320] [<bf2b071c>] (tcf_mirred [act_mirred]) from [<c0538918>] (tcf_action_exec+0x60/0x98)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.036338] [<c0538918>] (tcf_action_exec) from [<bf2a8500>] (u32_classify+0x194/0x380 [cls_u32])
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.045370] [<bf2a8500>] (u32_classify [cls_u32]) from [<c05341c4>] (tc_classify+0x74/0x12c)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.054121] [<c05341c4>] (tc_classify) from [<c050f8b8>] (__netif_receive_skb_core+0x38c/0x99c)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.062626] [<c050f8b8>] (__netif_receive_skb_core) from [<c0512e3c>] (process_backlog+0xa0/0x168)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.071046] [<c0512e3c>] (process_backlog) from [<c051256c>] (net_rx_action+0x128/0x2e4)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.080077] [<c051256c>] (net_rx_action) from [<c022bd84>] (__do_softirq+0xdc/0x230)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.088321] [<c022bd84>] (__do_softirq) from [<c022c1d8>] (irq_exit+0xb0/0x140)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.096049] [<c022c1d8>] (irq_exit) from [<c021f9f8>] (handle_IPI+0xd4/0x1bc)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.103078] [<c021f9f8>] (handle_IPI) from [<c0209474>] (gic_handle_irq+0x90/0xbc)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.110369] [<c0209474>] (gic_handle_irq) from [<c020a594>] (__irq_svc+0x54/0x70)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.117824] Exception stack(0xd9677e60 to 0xd9677ea8)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.125396] 7e60: d9677ed0 b6fee000 00000000 00001000 dcb26e70 b6fed000 00003000 dcb26ed8
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.130432] 7e80: db3a5a40 00100000 c07cc610 00000000 00001000 d9677eb4 b6f48000 c02c772c
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.138575] 7ea0: a0000013 ffffffff
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.146741] [<c020a594>] (__irq_svc) from [<c02c772c>] (unmapped_area_topdown+0xb4/0x1a0)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.150041] [<c02c772c>] (unmapped_area_topdown) from [<c02235cc>] (arch_get_unmapped_area_topdown+0x78/0x134)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.158374] [<c02235cc>] (arch_get_unmapped_area_topdown) from [<c02c5fd8>] (get_unmapped_area.part.1+0x58/0xa8)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.168272] [<c02c5fd8>] (get_unmapped_area.part.1) from [<c02c8c9c>] (do_mmap+0x130/0x3d8)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.178602] [<c02c8c9c>] (do_mmap) from [<c02b83b4>] (vm_mmap_pgoff+0x78/0xbc)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.186672] [<c02b83b4>] (vm_mmap_pgoff) from [<c02c7194>] (SyS_mmap_pgoff+0x94/0xf0)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.193962] [<c02c7194>] (SyS_mmap_pgoff) from [<c0209c00>] (ret_fast_syscall+0x0/0x3c)
Sun Mar 4 11:31:27 2018 kern.warn kernel: [ 2008.201955] ---[ end trace 70b2df21d1202635 ]---
Any pointers to where to begin looking? Or is this sort of warning expected and handled correctly, so there's nothing that needs fixing?