Public bug reported:
SRU Justification:
------------------
Impact:
Kernel freezes/panic when running wireless tests for soft-ap
Test case:
1. Create a soft-ap upon reboot.
2. Install Checkbox plano and :
$ sudo snap install --devmode checkbox-plano
3. Run below wifi-ap test case
$ checkbox-plano.checkbox-cli run .*device
.*wireless/caracalla-wifi_ap_.*wlan0_auto
4. Upon 3-4 iteraions, observed kernel crash as below,
[ 718.83244] BUG: unable to handle page request at 00000000001067e38
[ 718.83248] IP: cfg80211_scan_done+0xb0/0xc0 [cfg80211]
[ 718.83971] __ieee80211_scan_completed+0xb1/0x390 [mac80211]
[ 718.84078] ieee80211_scan_work+0x7e/0x480 [mac80211]
[ 718.84098] process_one_work+0x142/0x3d0
[ 718.84111] worker_thread+0x229/0x440
[ 718.84122] kthread+0xf5/0x130
[ 718.84132] ? process_one_work+0x3d0/0x3d0
[ 718.84140] ? kthread_associate_blkcg+0x90/0x90
[ 718.84152] ret_from_fork+0x35/0x40
Fix:
scan work function keeps running even after cancel_hw_scan() call.
Issue is resolved by calling cancel_work_sync() in rsi_mac80211_stop().
Regression Petential:
Ran Step 3 in 30-times. Didn't see any kernel panic.
This bug is for tracking purposes only, please don't triage.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
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https://bugs.launchpad.net/bugs/1777850
Title:
Redpine: Observed kernel panic while when running soft-ap tests
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