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List:       linux-rt-users
Subject:    Re: kernel BUG at /build/linux-rt/kernel/locking/rtmutex.c:997!
From:       Rolf Wojtech <rolf.wojtech () fos4x ! de>
Date:       2014-12-18 13:35:38
Message-ID: loom.20141218T143235-363 () post ! gmane ! org
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Juerg Haefliger <juergh <at> gmail.com> writes:

> 
> Dear RT experts,
> 
> I have a simple test that runs two iperf clients in parallel with the
> ltp network tests and it triggers a deadlock within a few minutes.
> This is 100% repeatable. I've tried this on different RT kernels and
> determined that prior to the following commit (which went into 3.10
> upstream), the machine doesn't deadlock and seems to run just fine:
> 
> fb52f40e085ef4074f1335672cd62c1f832af13b rtmutex: Handle deadlock
> detection smarter
> 
[...]

Hi Juerg,
it seems like we share the same problem.
There is a proposed fix by Paul Gortmaker from October 2014 that I replied 
to here: http://permalink.gmane.org/gmane.linux.rt.user/12699
We will try to reproduce the problem quicker using your suggestion (2 iperf 
clients). Keep us posted if you get a reply from someone with more RT and 
mutex experience.




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