xfs deadlock in stable kernel 3.0.4

Stefan Priebe s.priebe at profihost.ag
Mon Sep 19 19:47:12 CDT 2011


Am 19.09.2011 um 01:02 schrieb Dave Chinner <david at fromorbit.com>:

> On Sun, Sep 18, 2011 at 11:14:08AM +0200, Stefan Priebe - Profihost AG wrote:
>> Hi,
>> 
>> at least i'm now able to reproduce the issue. I hope this will help
>> to investigate the issue and hopefully you can reproduce it as well.
>> 
>> I'm using vanilla 3.0.4 kernel + xfs as root filesystem and had
>> detect hanging taks with 120s set. You'll then see that the bonnie++
>> command get's stuck in xlog_grant_log_space while creating or
>> deleting files. I was using a SSD or a fast Raid 10 (24x SAS Disks)
>> - i was not able to reproduce it on normal SATA disks even a 20x
>> SATA Raid 10 didn't work.
>> 
>> I used bonnie++ (V 1.96) to reproduce it. Mostly in the 1st run the
>> bug is triggered - sometimes I needed two runs.
>> 
>> bonnie++ -u root -s 0 -n 1024:32768:0:1024:4096 -d /
>> 
>> I hope that helps - as i now have a testing machine and can trigger
>> the bug pretty fast (10-30min instead of hours). I can also add
>> debug code if you want or have one.
> 
> If it is a log space accounting issue, then the output of 'xfs_info
> <mtpt>' is really necessary to set the filesystem up the same way
> (e.g. same log size, number of AGs, etc) so that it behaves the same
> way on different 

I can't get it. It just works on some part. and not on the other. Even xfs_info shows the same
for them. Also i have one part where it only happens when that one is
root (/). When i mount that one as /mnt it does not happen ;-(

Any idea on how to proceed now?

Stefan




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