Messages in this thread | | | Date | Fri, 25 Nov 2005 13:04:23 +0530 | From | Dinakar Guniguntala <> | Subject | Re: PI BUG with -rt13 |
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On Thu, Nov 24, 2005 at 08:56:06PM -0800, david singleton wrote: > On Nov 24, 2005, at 12:32 PM, Dinakar Guniguntala wrote: > > >>I just noticed with the above fix, Paul's testcase completely > >>hangs up and when killed I hit the BUG mentioned below. > >>Till -rt13, this testcase just ran to completion > > > >Forgot to mention that I notice the same failure with -rt15 as well > > Good news and bad news. > Good news. This test doesn't exercise the robust futex code. > Pthread mutexes that want priority queuing, priority inheritance and/or > robustness must have either the robust (PTHREAD_MUTEX_ROBUST_NP) > attribute set and/or the PTHREAD_PRIO_INHERIT attribute set at mutex > creation time.
Davi, Thank you for looking into this
Yes, this particular testcase does not exercise the robust futex code. However, the testcase only hangs when I apply your fix on top of -rt13. A Vanilla -rt13 works fine
> Now a question before the bad news, Are you in the OOM path when you > think the system is hung? What does 'top' say about freemem and > available and used swap space?
Since one of the threads is a SCHED_FIFO, the system takes forever to respond to simple commands like ls/ps. I'll get back on this
> > If you are not in the OOM path then the bad news is this looks like an > SMP timer problem. >
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