Hi Vineet,

On 09/03/2013 09:34 AM, Vineet Gupta wrote:

However assuming we are going ahead with debugging this - can you please confirm whether you see the issue on x86 as well as I have not tested that ? I vaguely remember one of your earlier posts suggested you did Thx, -Vineet

I'm unable to reproduce the issue so far. I ran
- something like 4000 stock msgctl08 with 4 cores on x86.
- a few runs with modified msgctl08 with either slowed down reader or slowed down writer threads. (i.e.: force queue full or queue empty waits).
- a few runs (modified&unmodified) with all but one core taken offline.

I have not yet tested with PREEMPT enabled.

A few more ideas:
- what is the output of ipcs -q? Are the queues empty or full?
- what is the output of then WCHAN field with ps when it hangs?
Something like
#ps -o pid,f,stat,pcpu,pmem,psr,wchan=WIDE-WCHAN -o comm,args

--
Manfred