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[V4.4-rc6 Regression] af_unix: Revert 'lock_interruptible' in stream receive code

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Hi Rainer,

A kernel bug report was opened against Ubuntu [0].  After a kernel
bisect, it was found that reverting the following commit resolved this bug:

commit 3822b5c2fc62e3de8a0f33806ff279fb7df92432
Author: Rainer Weikusat <rweikusat@mobileactivedefense.com>
Date:   Wed Dec 16 20:09:25 2015 +0000

    af_unix: Revert 'lock_interruptible' in stream receive code

      
The regression was introduced as of v4.4-rc6.

I was hoping to get your feedback, since you are the patch author.  Do
you think gathering any additional data will help diagnose this issue,
or would it be best to submit a revert request?

    
Thanks,
    
Joe

[0] http://pad.lv/1540731

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[V4.4-rc6 Regression] af_unix: Revert 'lock_interruptible' in stream  receive code Joseph Salisbury <joseph.salisbury@canonical.com> - 2016-02-05 20:00 +0100
  Re: [V4.4-rc6 Regression] af_unix: Revert 'lock_interruptible' in stream receive code Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2016-02-05 21:00 +0100
    Re: [V4.4-rc6 Regression] af_unix: Revert 'lock_interruptible' in  stream receive code Joseph Salisbury <joseph.salisbury@canonical.com> - 2016-02-05 21:10 +0100
      Re: [V4.4-rc6 Regression] af_unix: Revert 'lock_interruptible' in stream receive code Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2016-02-05 22:20 +0100
        Re: [V4.4-rc6 Regression] af_unix: Revert 'lock_interruptible' in stream receive code Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2016-02-05 23:10 +0100
  Re: [V4.4-rc6 Regression] af_unix: Revert 'lock_interruptible' in stream receive code Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2016-02-05 22:50 +0100
    Re: [V4.4-rc6 Regression] af_unix: Revert 'lock_interruptible' in  stream receive code Eric Dumazet <eric.dumazet@gmail.com> - 2016-02-06 00:10 +0100
      Re: [V4.4-rc6 Regression] af_unix: Revert 'lock_interruptible' in stream receive code Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2016-02-07 19:50 +0100
        Re: [V4.4-rc6 Regression] af_unix: Revert 'lock_interruptible' in stream receive code Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2016-02-07 21:40 +0100
        Re: [V4.4-rc6 Regression] af_unix: Revert 'lock_interruptible' in stream receive code Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2016-02-07 23:30 +0100
          Re: [V4.4-rc6 Regression] af_unix: Revert 'lock_interruptible' in  stream receive code Eric Dumazet <eric.dumazet@gmail.com> - 2016-02-08 04:40 +0100
  [PATCH] af_unix: Don't set err in unix_stream_read_generic unless there was an error Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2016-02-05 23:40 +0100
    Re: [PATCH] af_unix: Don't set err in unix_stream_read_generic unless there was an error Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2016-02-07 20:30 +0100
      [PATCH] af_unix: Don't set err in unix_stream_read_generic unless there was an error Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2016-02-08 16:40 +0100
        Re: [PATCH] af_unix: Don't set err in unix_stream_read_generic unless there was an error Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2016-02-08 19:10 +0100
          [PATCH] af_unix: Don't set err in unix_stream_read_generic unless there was an error Rainer Weikusat <rweikusat@mobileactivedefense.com> - 2016-02-08 19:50 +0100
        Re: [PATCH] af_unix: Don't set err in unix_stream_read_generic unless  there was an error Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> - 2016-02-08 19:40 +0100

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