Below warn and err logs I find in System logs,
[14 May 2026, 2:54:18 pm IST] kern.warn: [ 16.228265] gpio_button_hotplug: loading out-of-tree module taints kernel.
[14 May 2026, 2:54:18 pm IST] user.err: [ 27.788787] block: unable to load configuration (fstab: Entry not found)
[14 May 2026, 2:54:18 pm IST] user.err: [ 27.938857] block: unable to load configuration (fstab: Entry not found)
[14 May 2026, 2:54:18 pm IST] user.err: [ 28.098042] block: unable to load configuration (fstab: Entry not found)
[14 May 2026, 2:54:18 pm IST] user.err: [ 28.153608] block: no usable configuration
[14 May 2026, 2:54:18 pm IST] user.err: [ 29.184369] block: unable to load configuration (fstab: Entry not found)
[14 May 2026, 2:54:18 pm IST] user.err: [ 29.348819] block: unable to load configuration (fstab: Entry not found)
[14 May 2026, 2:54:18 pm IST] user.err: [ 29.506022] block: unable to load configuration (fstab: Entry not found)
[14 May 2026, 2:54:18 pm IST] user.err: [ 29.565357] block: no usable configuration
[14 May 2026, 2:54:18 pm IST] user.err: [ 32.113506] block: unable to load configuration (fstab: Entry not found)
[14 May 2026, 2:54:18 pm IST] user.err: [ 32.263826] block: unable to load configuration (fstab: Entry not found)
[14 May 2026, 2:54:18 pm IST] user.err: [ 32.418927] block: unable to load configuration (fstab: Entry not found)
[14 May 2026, 2:54:18 pm IST] user.err: [ 32.478236] block: no usable configuration
[14 May 2026, 2:54:18 pm IST] user.err: [ 32.608453] block: unable to load configuration (fstab: Entry not found)
[14 May 2026, 2:54:18 pm IST] user.err: [ 32.774053] block: unable to load configuration (fstab: Entry not found)
[14 May 2026, 2:54:18 pm IST] user.err: [ 32.931411] block: unable to load configuration (fstab: Entry not found)
[14 May 2026, 2:54:18 pm IST] user.err: [ 32.990584] block: no usable configuration
[14 May 2026, 2:54:18 pm IST] user.warn: [ 33.777378] urandom-seed: Seed file not found (/etc/urandom.seed)
[14 May 2026, 2:54:18 pm IST] kern.warn: [ 79.854606] ath10k_ahb a000000.wifi: 10.4 wmi init: vdevs: 16 peers: 48 tid: 96
[14 May 2026, 2:54:18 pm IST] kern.warn: [ 79.854685] ath10k_ahb a000000.wifi: msdu-desc: 2500 skid: 32
[14 May 2026, 2:54:18 pm IST] kern.warn: [ 83.269403] ath10k_ahb a800000.wifi: 10.4 wmi init: vdevs: 16 peers: 48 tid: 96
[14 May 2026, 2:54:18 pm IST] kern.warn: [ 83.269485] ath10k_ahb a800000.wifi: msdu-desc: 2500 skid: 32
[14 May 2026, 2:54:29 pm IST] kern.warn: [ 100.214939] ath10k_ahb a000000.wifi: 10.4 wmi init: vdevs: 16 peers: 48 tid: 96
[14 May 2026, 2:54:29 pm IST] kern.warn: [ 100.215027] ath10k_ahb a000000.wifi: msdu-desc: 2500 skid: 32
[14 May 2026, 2:54:29 pm IST] kern.warn: [ 100.844075] ath10k_ahb a000000.wifi: Firmware lacks feature flag indicating a retry limit of > 2 is OK, requested limit: 4
[14 May 2026, 2:54:33 pm IST] kern.warn: [ 104.292886] ath10k_ahb a800000.wifi: 10.4 wmi init: vdevs: 16 peers: 48 tid: 96
[14 May 2026, 2:54:33 pm IST] kern.warn: [ 104.292977] ath10k_ahb a800000.wifi: msdu-desc: 2500 skid: 32
[14 May 2026, 2:54:33 pm IST] kern.warn: [ 105.016237] ath10k_ahb a800000.wifi: Firmware lacks feature flag indicating a retry limit of > 2 is OK, requested limit: 4
[14 May 2026, 2:54:35 pm IST] daemon.warn: pppd[3016]: Connected to 00:00:XX:00:00:xx via interface wan
[14 May 2026, 2:54:35 pm IST] daemon.warn: odhcpd[1785]: No default route present, setting ra_lifetime to 0!
[14 May 2026, 2:54:35 pm IST] daemon.warn: odhcpd[1785]: rfc9096: br-lan: piofile updated
[14 May 2026, 2:54:35 pm IST] daemon.warn: odhcpd[1785]: No default route present, setting ra_lifetime to 0!
[14 May 2026, 2:54:36 pm IST] daemon.warn: odhcpd[1785]: No default route present, setting ra_lifetime to 0!
[14 May 2026, 2:54:37 pm IST] daemon.warn: odhcpd[1785]: No default route present, setting ra_lifetime to 0!
[14 May 2026, 2:54:40 pm IST] daemon.err: procd: Got unexpected signal 1
[14 May 2026, 2:56:28 pm IST] daemon.warn: odhcpd[1785]: rfc9096: br-lan: piofile updated
[14 May 2026, 2:56:39 pm IST] daemon.warn: dnsmasq[1]: failed to create listening socket for 2001:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:d4c4: Address in use
[14 May 2026, 2:56:45 pm IST] cron.err: crond[1884]: USER root pid 4163 cmd /mnt/usb/scripts/update-trusted-ipset.sh >> /mnt/usb/scripts/update-trusted-ipset.log
[14 May 2026, 2:57:33 pm IST] kern.warn: [ 180.189670] ath10k_ahb a000000.wifi: htt tx: fixing invalid VHT TX rate code 0xff
[14 May 2026, 2:58:07 pm IST] daemon.warn: dnsmasq[1]: possible DNS-rebind attack detected: dns.msftncsi.com
[14 May 2026, 2:58:07 pm IST] daemon.warn: dnsmasq[1]: possible DNS-rebind attack detected: dns.msftncsi.com
[14 May 2026, 2:58:07 pm IST] daemon.warn: dnsmasq[1]: possible DNS-rebind attack detected: dns.msftncsi.com
[14 May 2026, 2:58:08 pm IST] daemon.warn: dnsmasq[23]: possible DNS-rebind attack detected: dns.msftncsi.com
[14 May 2026, 2:58:26 pm IST] daemon.warn: dnsmasq[1]: possible DNS-rebind attack detected: dns.msftncsi.com
[14 May 2026, 3:00:00 pm IST] cron.err: crond[1884]: USER root pid 4520 cmd /mnt/usb/scripts/update-trusted-ipset.sh >> /mnt/usb/scripts/update-trusted-ipset.log
[14 May 2026, 3:05:00 pm IST] cron.err: crond[1884]: USER root pid 5154 cmd /mnt/usb/scripts/update-trusted-ipset.sh >> /mnt/usb/scripts/update-trusted-ipset.log
[14 May 2026, 3:07:06 pm IST] kern.warn: [ 753.280198] ath10k_ahb a000000.wifi: wmi: fixing invalid VHT TX rate code 0xff
[14 May 2026, 3:10:00 pm IST] cron.err: crond[1884]: USER root pid 5501 cmd /mnt/usb/scripts/update-trusted-ipset.sh >> /mnt/usb/scripts/update-trusted-ipset.log
I dont know if they are something to worry about.
I do have a cron and it works normally irrespective of the err found in System logs.
I also have an external pen drive plugged in, and that got mounted correctly too irrespective of the err found in System logs.