All of lore.kernel.org
 help / color / mirror / Atom feed
From: Rusty Russell <rusty@rustcorp.com.au>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Pekka Enberg <penberg@cs.helsinki.fi>,
	Ingo Molnar <mingo@elte.hu>,
	Manfred Spraul <manfred@colorfullife.com>,
	Peter Zijlstra <peterz@infradead.org>,
	cpufreq@vger.kernel.org
Subject: Re: circular locking dependency on shutdown
Date: Fri, 30 Jan 2009 15:13:35 +1030	[thread overview]
Message-ID: <200901301513.36002.rusty@rustcorp.com.au> (raw)
In-Reply-To: <1233255049.4067.12.camel@johannes.local>

On Friday 30 January 2009 05:20:49 Johannes Berg wrote:
> Hi,
> 
> Every time I shut down my machine with a 2.6.29-rc2 kernel, I get a
> lockdep report that scrolls off.
...
> halt is trying to acquire lock
> 	(&per_cpu(cpu_policy_rwsem, cpu)){---}
> 
> but task is already holding lock
> 	(&cpu_hotplug.lock){--..}

Hi Johannes,

   This looks much like the work_on_cpu()-getting-hotplug-lock problem which caused us to stop work_on_cpu doing that.  -rc3 has that fix; any chance of a re-test?

Thanks,
Rusty.

      parent reply	other threads:[~2009-01-30  4:44 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-01-29 18:50 circular locking dependency on shutdown Johannes Berg
2009-01-29 19:54 ` Johannes Berg
2009-01-29 20:27   ` Ingo Molnar
2009-01-30  4:43 ` Rusty Russell [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=200901301513.36002.rusty@rustcorp.com.au \
    --to=rusty@rustcorp.com.au \
    --cc=cpufreq@vger.kernel.org \
    --cc=heiko.carstens@de.ibm.com \
    --cc=johannes@sipsolutions.net \
    --cc=linux-kernel@vger.kernel.org \
    --cc=manfred@colorfullife.com \
    --cc=mingo@elte.hu \
    --cc=penberg@cs.helsinki.fi \
    --cc=peterz@infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.