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

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Date:	Mon, 9 Mar 2015 10:30:56 +1100
From:	NeilBrown <neilb@...e.de>
To:	Prakash Punnoor <prakash@...noor.de>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: udiskd high CPU usage with 4.0 git

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'.

Thanks,
NeilBrown

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