** Description changed:
SRU Justification
-----------------
Impact:
- Kernel freezes/panic when running wireless tests in regression
+ Kernel freezes/panic when running wireless tests in regression
Test case:
- 1. Keep a wrong access-point name in sta.conf file and run the nmcli.
- 2. There will be continuous scan will be happen and do remove the module
using rmmod.sh script.
- 3. When soft scan is happening in redpine driver, before connection. Some
times, we have observed
- a kernel panic. like below
- [ 1171.913244] BUG: unable to handle page request at 00000000001067e38
- [ 1171.913248] IP: cfg80211_scan_done+0xb0/0xc0 [cfg80211]
- [ 1171.913971] __ieee80211_scan_completed+0xb1/0x390 [mac80211]
- [ 1171.914078] ieee80211_scan_work+0x7e/0x480 [mac80211]
- [ 1171.914098] process_one_work+0x142/0x3d0
- [ 1171.914111] worker_thread+0x229/0x440
- [ 1171.914122] kthread+0xf5/0x130
- [ 1171.914132] ? process_one_work+0x3d0/0x3d0
- [ 1171.914140] ? kthread_associate_blkcg+0x90/0x90
- [ 1171.914152] ret_from_fork+0x35/0x40
-
+ 1. Keep a wrong access-point name in sta.conf file and run the nmcli.
+ 2. There will be continuous scan will be happen and do remove the module
using rmmod.sh script.
+ 3. When soft scan is happening in redpine driver, before connection. Some
times, we have observed
+ a kernel panic. like below
+ [ 1171.913244] BUG: unable to handle page request at 00000000001067e38
+ [ 1171.913248] IP: cfg80211_scan_done+0xb0/0xc0 [cfg80211]
+ [ 1171.913971] __ieee80211_scan_completed+0xb1/0x390 [mac80211]
+ [ 1171.914078] ieee80211_scan_work+0x7e/0x480 [mac80211]
+ [ 1171.914098] process_one_work+0x142/0x3d0
+ [ 1171.914111] worker_thread+0x229/0x440
+ [ 1171.914122] kthread+0xf5/0x130
+ [ 1171.914132] ? process_one_work+0x3d0/0x3d0
+ [ 1171.914140] ? kthread_associate_blkcg+0x90/0x90
+ [ 1171.914152] 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().
+ scan work function keeps running even after cancel_hw_scan() call.
+ Issue is resolved by calling cancel_work_sync().
Regression potential:
- Ran driver_crash.sh for 100 times and didn't see the issue.
+ Ran driver_crash.sh for 100 times and didn't see the issue.
+
+ This bug is for tracking purposes only, please don't triage.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Changed in: linux (Ubuntu)
Importance: Undecided => Critical
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https://bugs.launchpad.net/bugs/1773410
Title:
Redpine: Observed kernel panic while when running wireless tests in
regression mode
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