linux-kernel - Re: udiskd high CPU usage with 4.0 git

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Message-ID: <54FDC061.2030006@punnoor.de>
Date:	Mon, 09 Mar 2015 16:46:41 +0100
From:	Prakash Punnoor <prakash@...noor.de>
To:	NeilBrown <neilb@...e.de>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: udiskd high CPU usage with 4.0 git

On 09.03.2015 00:30, NeilBrown wrote:
> On Sun, 08 Mar 2015 18:14:39 +0100 Prakash Punnoor <prakash@...noor.de> wrote:
> 
>> Hi,
>>
>> I noticed the udisks daemon (version 2.1.4) suddenly started using high
>> cpu (one core at 100%) with linux 4.0 git kernel. I bisected it to:
>>
>> 750f199ee8b578062341e6ddfe36c59ac8ff2dcb
>>
>> And reverting it from current master (at
>> 2cf3afcd4cbe0e32b8722fc291e9255de1b4d6c6) fixes my problem indeed.
>>
>> I attached dmesg and config from
>> 2cf3afcd4cbe0e32b8722fc291e9255de1b4d6c6 with
>> 750f199ee8b578062341e6ddfe36c59ac8ff2dcb reverted. Any more infos
>> needed? I am actually using a raid5 array, if that matters:
>>
>> Personalities : [raid6] [raid5] [raid4]
>> md127 : active raid5 sdd1[1] sdb1[3] sdc1[0]
>>       3907023872 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3]
>> [UUU]
>>
>> unused devices: <none>
>>
>>
>> The array uses systemd automount feature (x-systemd.automount).
>>
>> Please CC me, as I am not subscribed.
>>
>>
>> Regards,
>>
>> Prakash
> 
> Thanks for the report.
> I can't reproduce this, or see what would cause it.
> 
> Can you please reproduce the problem and then run
> 
>   strace -o /tmp/udisks.trace -f -p `pidof udisksd`
> 
> for a few seconds, then interrupt and post the resulting '/tmp/udisks.trace'.

Hi, attached the trace.

Regards,

Prakash



Download attachment "udisks.trace.xz" of type "application/x-xz" (7464 bytes)