Re: Also seeing full deadlocks with 3.15.1

[Marc MERLIN <marc@merlins.org>]

On Fri, Jun 27, 2014 at 11:50:09AM -0700, Marc MERLIN wrote:
> My laptop deadlocked some more times (everything works until it needs to
> touch the filesystem, and then it's deadlocked).
> Unfortunately, I can trigger sysrq, but it doesn't get committed to disk and
> netconsole eats half of it because it goes too fast for UDP apparently
> 
> Now, I just captured that on my server with serial console.
> 
> 11005  1-16:11:10 wait_current_trans.isra.15     /usr/bin/zma -m 3
> 14441  1-16:07:44 wait_current_trans.isra.15     /usr/bin/zma -m 1
> 17045  1-23:53:33 wait_current_trans.isra.15     /usr/bin/zma -m 9
> 22261  2-00:40:36 wait_current_trans.isra.15     /usr/bin/zma -m 6
> 22292  2-00:40:36 wait_current_trans.isra.15     /usr/bin/zma -m 8
> 
> 19911    09:29:35 wait_current_trans.isra.15     rm -f -- /mnt/dshelf2/backup/0Notmachines/mysql//mysql.daily.sql.gz.13 /mnt/dshelf2/backup/0Notmachines/mysql//mysql.daily.sql.gz.13.gz
> 22848  1-05:18:35 wait_current_trans.isra.15     rm -f -- mnt/dshelf2/backup/0Notmachines/jen//backup.tar.bz.11 mnt/dshelf2/backup/0Notmachines/jen//backup.tar.bz.11.gz
> 
> Those are 2 different filesystems (one single device mapper disk, the other one is btrfs raid1), so I'm not sure which one of the 2 caused the problem, but I'm perplexed as to why one would than hang the other, unless they both hit the same bug?

Ok, soon after reboot, I'm already seeing this:
  742       37:19 wait_current_trans.isra.15     /usr/bin/zma -m 9
 5494       06:45 wait_current_trans.isra.15     /bin/rm -rf 1/14/06/27/13/10/18
11258    01:48:28 wait_current_trans.isra.15     /usr/bin/zma -m 3
14076       27:01 wait_current_trans.isra.15     /usr/bin/zma -m 1
21615       47:18 wait_current_trans.isra.15     /usr/bin/zma -m 8

on this filesystem:
gargamel:~# btrfs fi df /mnt/btrfs_raid0/
Data, RAID0: total=1.47TiB, used=892.25GiB
Data, single: total=8.00MiB, used=7.95MiB
System, RAID1: total=8.00MiB, used=128.00KiB
System, single: total=4.00MiB, used=0.00
Metadata, RAID1: total=15.00GiB, used=6.09GiB
Metadata, single: total=8.00MiB, used=0.00
unknown, single: total=512.00MiB, used=64.00KiB

If I don't hear anything by the end of today, I'll just delete the
filesystem and start over.

Marc
-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/                         | PGP 1024R/763BE901