On Thu, Feb 01 2007, Christoph Lameter wrote:
> On Thu, 1 Feb 2007, Jens Axboe wrote:
>
> > That looks like barriers, could you try with those disabled? Sorry for
> > making you go through this, I can't debug and fix it myself before
> > monday.
>
> Disabling barriers + your patch works. Modified /etc/fstab and added a
> nobarrier option to the root filesystem. If I take your patch out then the
> systems hangs again.
I can't reproduce this. Can you see if this debug patch catches
anything? You need to enable barriers again.
diff --git a/kernel/sched.c b/kernel/sched.c
index e209901..00c2ab9 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3434,6 +3434,10 @@ asmlinkage void __sched schedule(void)
print_irqtrace_events(current);
dump_stack();
}
+ if (unlikely(current->io_context && current->io_context->plugged)) {
+ printk(KERN_ERR "%s: schedules plugged\n", current->comm);
+ print_irqtrace_events(current);
+ }
profile_hit(SCHED_PROFILING, __builtin_return_address(0));
need_resched:
--
Jens Axboe
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