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