Gregory Haskins wrote: > Hi Chirag > > Chirag Jog wrote: > >> Hi Gregory, >> We see the following BUG followed by a hang on the latest kernel 2.6.26.5-rt9 on a Power6 blade (PPC64) >> It is easily recreated by running the async_handler or sbrk_mutex (realtime tests from ltp) tests. >> >> > > Call me an LTP newbie, but where can I get the sbrk_mutex/async_handler > tests. Ok, I figured out this part. I needed a newer version of the .rpm from a different repo. However, both async_handler and sbrk_mutex seem to segfault for me. Hmm --- ghaskins@test:~> uname -a Linux test 2.6.26.5-rt9-rt #1 SMP PREEMPT RT Mon Sep 29 14:26:45 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux test:/home/ghaskins # /usr/lib64/ltp/testcases/realtime/func/async_handler/async_handler ----------------------------------- Asynchronous Event Handling Latency ----------------------------------- jvmsim disabled Running 1000000 iterations Segmentation fault --- Any ideas? -Greg > I installed the LTP rpm and I dont seem to have tests by that > name. I have a 26.5-rt9 kernel all configured and ready to go but no > way to reproduce this issue. Please advise. > > Regards, > -Greg > > > >> login: cpu 0x2: Vector: 700 (Program Check) at [c0000000e8e875d0] >> pc: c00000000005110c: .pick_next_pushable_task+0x54/0x9c >> lr: c000000000059f50: .push_rt_task+0x44/0x2b4 >> sp: c0000000e8e87850 >> msr: 8000000000021032 >> current = 0xc0000000ea5bb2e0 >> paca = 0xc000000000608700 >> pid = 2811, comm = async_handler >> kernel BUG at kernel/sched_rt.c:1041! <--------------------- >> enter ? for help >> [link register ] c000000000059f50 .push_rt_task+0x44/0x2b4 >> [c0000000e8e87850] c0000000e8e878f0 (unreliable) >> [c0000000e8e87900] c00000000005a1dc .push_rt_tasks+0x1c/0x38 >> [c0000000e8e87980] c00000000005a21c .post_schedule_rt+0x24/0x44 >> [c0000000e8e87a10] c000000000057cbc .finish_task_switch+0xd0/0x180 >> [c0000000e8e87ab0] c0000000003b6e88 .__schedule+0x6e0/0x798 >> [c0000000e8e87b90] c0000000003b7148 .schedule+0xec/0x11c >> [c0000000e8e87c10] c0000000003b7a40 .do_nanosleep+0x6c/0xcc >> [c0000000e8e87c90] c000000000080738 .hrtimer_nanosleep+0x7c/0x100 >> [c0000000e8e87d90] c000000000080830 .sys_nanosleep+0x74/0x94 >> [c0000000e8e87e30] c0000000000086ac syscall_exit+0x0/0x40 >> --- Exception: c00 (System Call) at 0000008026449844 >> SP (400014185f0) is in userspace >> >> >> This is generated by the BUG_ON lines in the pick_next_pushable function >> introduced by the sched-only-push-once-per-queue.patch . >> >> The -rt kernel prior to this patch didnot give such BUGes. >> >> All this was tried with >> CONFIG_GROUP_SCHED=N >> CONFIG_RT_GROUP_SCHED=N >> >> >> Setting the options >> CONFIG_GROUP_SCHED=y >> CONFIG_RT_GROUP_SCHED=Y, >> seems to solve the problem. >> >> >> >> >> > > >
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