linux-kernel - Re: Debugging system freezes on filesystem writes

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Date:	Mon, 25 Feb 2013 14:05:46 +0100
From:	Jan Kara <jack@...e.cz>
To:	Marcus Sundman <marcus@...ox.fi>
Cc:	Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: Debugging system freezes on filesystem writes

On Sat 23-02-13 01:27:38, Marcus Sundman wrote:
> Sure:
> >$ cat /proc/mounts
> >rootfs / rootfs rw 0 0
> >sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
> >proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
> >udev /dev devtmpfs rw,relatime,size=1964816k,nr_inodes=491204,mode=755 0 0
> >devpts /dev/pts devpts
> >rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
> >tmpfs /run tmpfs rw,nosuid,relatime,size=789652k,mode=755 0 0
> >/dev/disk/by-uuid/5bfa7a58-2d35-4758-954e-4deafb09b892 / ext4
> >rw,noatime,discard,errors=remount-ro 0 0
> >none /sys/fs/fuse/connections fusectl rw,relatime 0 0
> >none /sys/kernel/debug debugfs rw,relatime 0 0
> >none /sys/kernel/security securityfs rw,relatime 0 0
> >none /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0 0
> >none /run/shm tmpfs rw,nosuid,nodev,relatime 0 0
> >none /run/user tmpfs
> >rw,nosuid,nodev,noexec,relatime,size=102400k,mode=755 0 0
> >/dev/sda6 /home ext4 rw,noatime,discard 0 0
> >binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc
> >rw,nosuid,nodev,noexec,relatime 0 0
> >gvfsd-fuse /run/user/marcus/gvfs fuse.gvfsd-fuse
> >rw,nosuid,nodev,relatime,user_id=1000,group_id=100 0 0
> 
> Both / and /home are on the same SSD and suffer from the same
> problem. (I think the swap does as well, but I have my swappiness
> set very low to minimize swapping.)
  Yeah, my suspicion is confirmed. Try removing the 'discard' option. See
Ted's email for more details.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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