linux-kernel - Re: "Unkillable processes" and INFO: task ... blocked for more than 120 seconds

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Message-ID: <mc7qvl$6ps$1@ger.gmane.org>
Date:	Fri, 20 Feb 2015 18:30:29 +0100
From:	Manuel Reimer <Manuel.Spam@...fuerspam.de>
To:	linux-kernel@...r.kernel.org
Subject: Re: "Unkillable processes" and INFO: task ... blocked for more than
 120 seconds

Hello,

I can add that this problem seems to be reproducible for me so either 
some change in one of the latest kernel updates caused this or something 
on my system hardware is starting to fail...

If I open "a few" photos on GIMP (enough to get the application memory 
usage above 40%) then I'm able to close GIMP without any problems but it 
seems to get stuck in exactly the same way as it happened the first time.

My system kernel: Linux manuelspc 3.18.6-1-ARCH #1 SMP PREEMPT Sat Feb 7 
08:44:05 CET 2015 x86_64 GNU/Linux


On 02/20/2015 06:13 PM, Manuel Reimer wrote:
> Hello,
>
> today, I had the following problem:
>
> I was editing a few photos in GIMP and after I finished with that, I
> tried to close GIMP which failed. KDE offered me to terminate the
> application which also didn't work.
>
> So I opened a terminal and tried "killall -9 gimp" --> No success
>
> Next I tried "pgrep gimp" to get the PID of the hanging process. With
> the result that pgrep now also got stuck with hangup of my whole shell.
>
> A "strace pgrep gimp" told me that pgrep actually hung up on a read on
> "/proc/18294/cmdline" so I guessed that this could be my hanging GIMP
> process. But even "kill -9 18294" was not able to kill the process.
>
> So I switched over to a VT shell and logged in as root which at first
> hung up the login shell, but was fixable by pressing "Ctrl + C". Even as
> root I was unable to kill GIMP.
>
> The kernel didn't actually crash. My music player continued to play
> nicely and my mail client was fully usable.
>
> I saved some log output to pastebin: http://pastebin.com/FPDvyePJ
>
> What has been happening here? Why is it possible that I actually get
> non-killable processes?
>
> If you need additional information, please ask.
>
> Thank you very much in advance.
>
> Manuel
>


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