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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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