linux-kernel - Re: 2.6.23.1: mdadm/raid5 hung/d-state

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Message-ID: <Pine.LNX.4.64.0711040841160.2225@p34.internal.lan>
Date:	Sun, 4 Nov 2007 08:42:04 -0500 (EST)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	BERTRAND Joël <joel.bertrand@...tella.fr>
cc:	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org
Subject: Re: 2.6.23.1: mdadm/raid5 hung/d-state



On Sun, 4 Nov 2007, BERTRAND Joël wrote:

> Justin Piszcz wrote:
>> # ps auxww | grep D
>> USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
>> root       273  0.0  0.0      0     0 ?        D    Oct21  14:40 [pdflush]
>> root       274  0.0  0.0      0     0 ?        D    Oct21  13:00 [pdflush]
>> 
>> After several days/weeks, this is the second time this has happened, while 
>> doing regular file I/O (decompressing a file), everything on the device 
>> went into D-state.
>
> 	Same observation here (kernel 2.6.23). I can see this bug when I try 
> to synchronize a raid1 volume over iSCSI (each element is a raid5 volume), or 
> sometimes only with a 1,5 TB raid5 volume. When this bug occurs, md subsystem 
> eats 100% of one CPU and pdflush remains in D state too. What is your 
> architecture ? I use two 32-threads T1000 (sparc64), and I'm trying to 
> determine if this bug is arch specific.
>
> 	Regards,
>
> 	JKB
>

Using x86_64 here (Q6600/Intel DG965WH).

Justin.