Public bug reported:

My home server/router/access point runs under Ubuntu 18.04.4 with all updates 
and has 2 wifi adapters operated by hostapd
one is USB AR9271 (0cf3:9271, driver ath9k_htc), another is PCIe Intel AC 9260 
(8086:2526, driver iwlwifi).
with kernel 4.15.0-88 it worked quite stable, with reboots required mostly 
after kernel upgrades (much less frequent reboots due to panics)
with kernel 4.15.0-91 and -96 it started rebooting by itself by panic when a 
lot of activity happening via Intel 9260.
In /etc/sysctl* I have kernel.panic=10 , kernel.softlockup_panic=1 and 
kernel.panic_on_oops=1 overrides of default values.
In dmesg logs preceding the reboot, I see multiple warnings with stacks inside 
iwl_mvm functions which I could provide by apport. Also, multiple messages like 
"Command LQ_CMD: a command is already active!" or "Error sending LQ_CMD: time 
out after 2000ms"
Unfortunately I run this box headless and I don't have another wired Ethernet 
host to capture its panics by netconsole
The rest of hardware is pretty standard. Asus B85M-G mobo, Core i3-4130T CPU, 
nothing overly special.
More details I would provide in your further requests but the current kernel 
behavior is very annoying.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1871430

Title:
  iwlwifi/iwlmvm & Intel 9260 made kernel unstable since 4.15.0-91

Status in linux package in Ubuntu:
  New

Bug description:
  My home server/router/access point runs under Ubuntu 18.04.4 with all updates 
and has 2 wifi adapters operated by hostapd
  one is USB AR9271 (0cf3:9271, driver ath9k_htc), another is PCIe Intel AC 
9260 (8086:2526, driver iwlwifi).
  with kernel 4.15.0-88 it worked quite stable, with reboots required mostly 
after kernel upgrades (much less frequent reboots due to panics)
  with kernel 4.15.0-91 and -96 it started rebooting by itself by panic when a 
lot of activity happening via Intel 9260.
  In /etc/sysctl* I have kernel.panic=10 , kernel.softlockup_panic=1 and 
kernel.panic_on_oops=1 overrides of default values.
  In dmesg logs preceding the reboot, I see multiple warnings with stacks 
inside iwl_mvm functions which I could provide by apport. Also, multiple 
messages like "Command LQ_CMD: a command is already active!" or "Error sending 
LQ_CMD: time out after 2000ms"
  Unfortunately I run this box headless and I don't have another wired Ethernet 
host to capture its panics by netconsole
  The rest of hardware is pretty standard. Asus B85M-G mobo, Core i3-4130T CPU, 
nothing overly special.
  More details I would provide in your further requests but the current kernel 
behavior is very annoying.

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