From: Nathan Lynch <ntl@pobox.com>
To: Linas Vepstas <linas@austin.ibm.com>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: Hard hang in hypervisor!?
Date: Tue, 9 Oct 2007 16:18:19 -0500 [thread overview]
Message-ID: <20071009211819.GR29559@localdomain> (raw)
In-Reply-To: <20071009203724.GM4350@austin.ibm.com>
Linas Vepstas wrote:
>
> 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?
Sounds consistent with a task trying to double-acquire the lock, or an
interrupt handler attempting to acquire a lock that the current task
holds. Or maybe even an uninitialized spinlock. Do you know which
lock it was?
next prev parent reply other threads:[~2007-10-09 21:18 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-09 20:37 Hard hang in hypervisor!? Linas Vepstas
2007-10-09 21:18 ` Nathan Lynch [this message]
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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