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List:       reiserfs-devel
Subject:    Re: Problems with the 'flush-8:0' process in 2.6.35.3
From:       Edward Shishkin <edward.shishkin () gmail ! com>
Date:       2010-08-31 0:21:16
Message-ID: 4C7C4AFC.2040009 () gmail ! com
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Edward Shishkin wrote:
> Andrej Podzimek wrote:
>   
>> Hello,
>>     
>
> Hello.
>
>   
>> I use a 2.6.35.3 kernel and Reiser4 as the root file system. In a
>> couple of minutes after boot, a kernel process called 'flush-8:0'
>> takes up all the available CPU time. From that moment on, it is
>> impossible to sync filesystems (and suspend, hibernate or reboot).
>> (The 'sync' command halts indefinitely.) In some cases it is even
>> impossible to log in. Existing sessions seem to work fine, to an extent.
>>
>> I first thought this was related to the GTT chipset coherency patch.
>> (This patch fixes a one-year-old bug that caused all the Intel 855
>> class GPUs to be totally unusable.) However, removing the patch and
>> testing with only a vanilla kernel (and Reiser4, of course) showed
>> that 'flush-8:0' will eventually go mad, no matter if the GPU-related
>> patch is present or not.
>>
>> The machine is an Asus M2400N laptop with a 100GB Seagate Momentus.
>>
>> Is this a known issue?
>>     
>
> Um, nop..
>
>   
>> How could I track this down?
>>     
>
> Could you try to catch sysrq-t output to take a look what the flush-8:0
> doing?
>   

Any progress here?
Also could you please check your partition with fsck?

Thanks,
Edward.

>   
>> In fact I don't even know whether this is related to Reiser4 or not.
>>     
>
> Which kernel version did you have before upgrade?
>
> Thanks,
> Edward.
>
>   
>> It may be a bug in VFS. I don't use 'noflushd' or anything of that
>> kind. (Some people reported similar problems related to noflushd. So
>> this is not the case.) If this is unrelated to Reiser4, where should I
>> report it?
>>
>> Andrej
>>
>>     
>
>
>   

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