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[Bug 1777850] Re: Redpine: Observed kernel panic while running soft-ap tests

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>
Date: Wed, 03 Oct 2018 14:27:44 -0000
Reply-to: Bug 1777850 <1777850@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: linux (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1777850

Title:
  Redpine: Observed kernel panic while running soft-ap tests

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:
  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.

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