From: linas@austin.ibm.com (Linas Vepstas)
To: linuxppc-dev@ozlabs.org
Subject: Hard hang in hypervisor!?
Date: Tue, 9 Oct 2007 15:37:24 -0500 [thread overview]
Message-ID: <20071009203724.GM4350@austin.ibm.com> (raw)
I was futzing with linux-2.6.23-rc8-mm1 in a power6 lpar when,
for whatever reason, a spinlock locked up. The bizarre thing
was that the rest of system locked up as well: an ssh terminal,
and also an hvc console.
Breaking into the debugger showed 4 cpus, 1 of which was
deadlocked in the spinlock, and the other 3 in
.pseries_dedicated_idle_sleep
This was, ahhh, unexpected. What's up with that? Can
anyone provide any insight?
I should mention:
-- prior to the complete hard lockp, I did see
BUG: soft lockup - CPU#0 stuck for 11s! [ip:4473]
go off, and I did manage to sneak in a few commands
into the console and the ssh session. Then it locked
up hard -- but still not completely -- exactly
360 seconds later, a kernel thread ran for a while,
producing some console output, even though the
keyboard and console were locked up.
--linas
next reply other threads:[~2007-10-09 20:37 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-09 20:37 Linas Vepstas [this message]
2007-10-09 21:18 ` Hard hang in hypervisor!? Nathan Lynch
2007-10-09 21:28 ` Linas Vepstas
2007-10-09 23:22 ` never mind .. [was " Linas Vepstas
2007-10-11 0:04 ` Paul Mackerras
2007-10-11 20:30 ` Linas Vepstas
2007-10-11 21:35 ` Milton Miller
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