Hi Manfred,
> I am using 2.6.21-rc7 with Preempt_rt Patch 2.6.20-rc6-rt0 on ep93xx.
Do you mean 2.6.21-rc6-rt0?
> This oops does not trigger in preempt_rt patch is applied.
It does only appear, when the preempt_rt patch is applied. Did I get you
right?
> On startup i get following oops when preemption is none.
>
> Mount-cache hash table entries: 512
> CPU: Testing write buffer coherency: ok
> BUG: at kernel/sched.c:4285 __schedule()
> [<c006d404>] (dump_stack+0x0/0x14) from [<c02eeea4>] (__schedule+0x844/0x8e0)
> [<c02ee660>] (__schedule+0x0/0x8e0) from [<c02ef038>] (schedule+0xd0/0x118)
> [<c02eef68>] (schedule+0x0/0x118) from [<c02ef3e0>]
> (wait_for_completion+0x94/0xf0)
> r4 = C042DE88
> [<c02ef34c>] (wait_for_completion+0x0/0xf0) from [<c0099c14>]
> (keventd_create_kthread+0x3c/0x74)
> r7 = 00000000 r6 = 00000002 r5 = C042DED4 r4 = C042DF18
> [<c0099bd8>] (keventd_create_kthread+0x0/0x74) from [<c0099ccc>]
> (kthread_create+0x80/0xc8)
> r6 = C001C320 r5 = C042DED4 r4 = 00000000
> [<c0099c4c>] (kthread_create+0x0/0xc8) from [<c009ad48>]
> (posix_cpu_thread_call+0x40/0xb8)
> r3 = 00000000 r2 = C0352BD0
> r5 = 00000000 r4 = 00000000
> [<c009ad08>] (posix_cpu_thread_call+0x0/0xb8) from [<c000dd10>]
> (posix_cpu_thread_init+0x24/0x40)
> r5 = 00000000 r4 = C03A7F74
> [<c000dcec>] (posix_cpu_thread_init+0x0/0x40) from [<c00088b0>]
> (init+0x38/0x30c)
> r4 = 00000000
> [<c0008878>] (init+0x0/0x30c) from [<c0087b90>] (do_exit+0x0/0x80c)
This WARN_ON in __schedule seems to be triggered:
if (!irqs_disabled()) {
static int once = 1;
if (once) {
once = 0;
print_irqtrace_events(current);
WARN_ON(1);
}
}
I've seen this on an Atmel AT91SAM9261EK board a few days ago, when I
was implementing GENERIC_TIME and GENERIC_CLOCKEVENTS. I've tested with
2.6.20-rt8 and 2.6.21-rc6-rt0.
(an early version of the patch can be found here:
http://www.tglx.de/private/jan/at91sam/at91sam9260-generic-time-2.6.21-rc6-rt0.diff)
Jan
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