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SubjectRe: preempt-related hangs
On Sun, 24 Mar 2002, Andrew Morton wrote:

> I sent this email to Ingo last week; seems that he's
> having some downtime. It was happening on my dual PIII
> and I now discover that the quad pIII does the same
> thing. Any ideas?
> Kernel is 2.5.7, dual PIII. When I enable preempt it
> locks during boot.

same 2.5.7 here with quad ppro emulation, i have preempt disabled.

> I applied the kgdb patch and had a poke.
> (gdb) info threads
> * 6 Thread 6 preempt_schedule () at sched.c:848
> 5 Thread 5 preempt_schedule () at sched.c:848
> 4 Thread 4 context_thread (startup=0xc0395f90) at context.c:101
> 3 Thread 3 migration_thread (unused=0x0) at sched.c:1646
> 2 Thread 2 migration_thread (unused=0x0) at sched.c:1646
> 1 Thread 1 spawn_ksoftirqd () at softirq.c:407
> Note that init is stuck in spawn_ksoftirqd. It's spinning in
> that function, yielding, waiting for the softirqd threads to
> come alive. They're threads 5 and 6.

I'm locking in the same place i have my last CPU spinning, waiting for its
softirqd thread. Then i get a smp_migrate_task IPI from an alive CPU, at
which case i'm stuck.


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