From: Andrew Morton <akpm@digeo.com>
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.5.70 (virgin) hangs running SDET
Date: Mon, 9 Jun 2003 14:08:34 -0700 [thread overview]
Message-ID: <20030609140834.11ad0d63.akpm@digeo.com> (raw)
In-Reply-To: <60380000.1055188542@flay>
"Martin J. Bligh" <mbligh@aracnet.com> wrote:
>
> I thought this was specific to the -mjb tree for a while, but I can
> reproduce it pretty easily on virgin 2.5.70 (but 2.5.69 didn't do
> this). Andrew looked and pointed out it seems to be an i_sem (ISTR
> some mention of /proc somewhere too?). Got a good sysrq+t trace out
> of the virgin kernel (on 16x NUMA-Q) ... below:
The ps instance which is spinning on kernel_flag in proc_root_lookup is
what's holding things up.
Or is it spinning in proc_lookup() or proc_pid_lookup()? I have a vague
feeling that I've seen these traces miss out the innermost stack slot...
Suggest:
a) Use CONFIG_SPINLINE, get a new sysrq-T trace
b) Enable spinlock debugging
c) Try disabling the sched_balance_exec() code.
next parent reply other threads:[~2003-06-09 20:58 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <60380000.1055188542@flay>
2003-06-09 21:08 ` Andrew Morton [this message]
2003-06-10 5:27 ` Martin J. Bligh
2003-06-10 14:14 ` Martin J. Bligh
2003-06-10 17:34 ` Martin J. Bligh
2003-06-10 19:46 ` Andrew Morton
2003-06-10 20:01 ` William Lee Irwin III
2003-06-11 5:06 ` Martin J. Bligh
2003-06-11 5:21 ` Andrew Morton
2003-06-11 14:36 ` Martin J. Bligh
2003-06-09 20:21 Martin J. Bligh
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