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[Bug 1769671] Re: [Xenial] Kernels OOPS when mwifiex is in AP mode

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Kleber Sacilotto de Souza <kleber.souza@xxxxxxxxxxxxx>
Date: Tue, 08 May 2018 16:07:57 -0000
Reply-to: Bug 1769671 <1769671@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** No longer affects: linux (Ubuntu Bionic)

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https://bugs.launchpad.net/bugs/1769671

Title:
  [Xenial] Kernels OOPS when mwifiex is in AP mode

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  New

Bug description:
  There's quite a chance to find kernel oops when mwifiex is in AP mode.
  Previously two workaround commits were added in the Xenial kernel,
  8a034f97a28dba62026343eef7992766c91273a7 and
  f21d12781c88413aec7ee44983f05b1cdf90662f, to mitigate this issue. The
  original report can be found at
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1712746 .

  Now that a fix has been merged in mainline, it's time to revert the
  workaround and apply the fix:

  commit c61cfe49f0f0f0d1f8b56d0b045838d597e8c3a3
  Author: Limin Zhu <liminzhu@xxxxxxxxxxx>
  Date:   Thu Nov 30 14:22:34 2017 +0800

      mwifiex: cfg80211: do not change virtual interface during scan processing
      
      (1) Change virtual interface operation in cfg80211 process reset and
      reinitilize private data structure.
      (2) Scan result event processed in main process will dereference private
      data structure concurrently, ocassionly crash the kernel.
      
      The cornel case could be trigger by below steps:
      (1) wpa_cli mlan0 scan
      (2) ./hostapd mlan0.conf
      
      Cfg80211 asynchronous scan procedure is not all the time operated
      under rtnl lock, here we add the protect to serialize the cfg80211
      scan and change_virtual interface operation.
      
      Signed-off-by: Limin Zhu <liminzhu@xxxxxxxxxxx>
      Signed-off-by: Xinming Hu <huxm@xxxxxxxxxxx>
      Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx>

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