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Re: Some alpha problems in current
On Sat, 2 Feb 2008, Michael L. Hitch wrote:
I finally got around to trying out a more current kernel on one my MP
alphas, and have problems with hangs. I can't get tracebacks from the other
CPU - most likely because it is spinning on a lock or mutex with interrupts
disabled and the IPI to suspend it can not be processed. A couple of times
the halted CPU appears to be in _kernel_lock(). The last
one appears to be in mutex_vector_enter(), called from pmap_tlb_shootdown().
I have rev 1.231 of pmap.c.
One other note: a -current UP kernel seems to work fine.
I'm now trying a kernel where I've added a SPINLOCK_SPIN_HOOK in
the places where sys/kern/mutex.c spins, and my MP kernel has been running
for over 2 hours. I'm going to try a LOCKDEBUG kernel again after a while
to see if that's changed by the addition of the SPINLOCK_SPIN_HOOKs.
Michael L. Hitch mhitch%NetBSD.org@localhost
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