linux-kernel - Re: [2.6.33-rc5] Weird deadlock when shutting down

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 18 Feb 2010 10:36:15 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [2.6.33-rc5] Weird deadlock when shutting down

On Fri, 2010-01-29 at 15:41 +1100, Benjamin Herrenschmidt wrote:
> Hi Ingo !
> 
> Johannes and I see this on our quad G5s... it -could- be similar to
> one reported a short while ago by Xiaotian Feng <xtfeng@...il.com>
> under the subject [2.6.33-rc4] sysfs lockdep warnings on cpu hotplug.
>  
> Basically, the machine deadlocks right after printing the following
> when doing a shutdown:
> 
> halt/4071 is trying to acquire lock:
>  (s_active){++++.+}, at: [<c0000000001ef868>]
> .sysfs_addrm_finish+0x58/0xc0
> 
> but task is already holding lock:
>  (&per_cpu(cpu_policy_rwsem, cpu)){+.+.+.}, at: [<c0000000004cd6ac>]
> .lock_policy_rwsem_write+0x84/0xf4
> 
> which lock already depends on the new lock.
> 
> the existing dependency chain (in reverse order) is:

This is still happening with -rc8. Any news?

johannes

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/