linux-kernel - Re: Hung task - sync - 2.6.33-rc7 w/md6 multicore rebuild in process

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]

Message-id: <4B7CAB4E.2090002@majjas.com>
Date:	Wed, 17 Feb 2010 21:51:58 -0500
From:	Michael Breuer <mbreuer@...jas.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Hung task - sync - 2.6.33-rc7  w/md6 multicore rebuild in	process

On 2/17/2010 9:39 PM, Jan Kara wrote:
>> On 2/13/2010 11:51 AM, Michael Breuer wrote:
>>      
>> Note: this cleared after about 90 minutes - sync eventually completed.
>> I'm thinking that with multicore enabled the resync is able to starve
>> out normal system activities that weren't starved w/o multicore.
>>      
>    Hmm, it is a bug in writeback code. But as Linus pointed out, it's not really
> clear why it's *so* slow. So when it happens again, could you please sample for
> a while (like every second for 30 seconds) stacks of blocked tasks via
> Alt-Sysrq-W? I'd like to see where flusher threads are hanging... Thanks.
>
> 								Honza
>    
Ok - will do. On rc8 now - and up about 3 days without any issues. If I 
have some time tomorrow I'll force a raid resync and see what happens.
--
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/