linux-kernel - 2.6.31.4-rt14 posix message queues problem

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Message-ID: <4AD76126.1000408@alcatel-lucent.de>
Date:	Thu, 15 Oct 2009 19:51:34 +0200
From:	Joerg Abraham <Joerg.Abraham@...atel-lucent.de>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: 2.6.31.4-rt14 posix message queues problem

Hi,

During some performance measurement I stumbled over unexpected bad results for 
a posix message queue test case. Which is not surprising since the kernel log 
shows a "BUG: scheduling while atomic:" on every measurement trigger.

Attached is the kernel log for an embedded 8572ds powerpc system and a 
condensed user space test appli. The test appli uses 2 processes (mq_server 
and mq_client) and pingpongs some messages via posix message queues. Please 
see the c-file header for details (the appli itself makes not much sense but 
shows the problem).

./mq_server
./mq_client # just crashes during run

The problem does _not_ occur on kernels 2.6.29.6-rt24, 2.6.29.6 vanilla and 
2.6.31.4 vanilla. The problem does _also_ show up on an embedded x86_64 system 
and a full featured fc11 x86_64 system running a 2.6.31.4-rt14 based kernel, 
so I dont think it's arch dependent.

Can anybody reproduce the crash ???

If you need more info's please let me know.

[And if I'm doing stupid things just forgive me]

Thanx

Joerg

View attachment "2.6.31.4-rt14_posix_mq.crash" of type "text/plain" (3509 bytes)

View attachment "mq.c" of type "text/plain" (5936 bytes)