Re: RAID-1 and Reiser4 issue: umount hangs

[Alexander Zarochentsev <zam@namesys.com>]

Hello,

On Tuesday 30 May 2006 00:17, Arend Freije wrote:
> Hi,
>
> I'm using Reiser4 for my filesystems on disk (/dev/sda) , and it
> works just fine. Recently I bought a second disk (/dev/sdb) for
> RAID-1 mirroring. With mdadm I created a degraded raid-1 array  on
> /dev/md/0, devices missing,/dev/sdb1. After that I created a Reiser4
> filesystem on /dev/md/0 and mounted it at /mnt. Then I copied the
> data from /dev/sda1 to /mnt.

would it work better with "no_write_barrier" mount option?

> All goes well until I umount /mnt, umount simply hangs without any
> error. Syslog doesn't report any error. In /proc/mdstat, the array
> remains "active sync". Shutting down linux fails because the umount
> is still waiting and seems to block other umounts. The umount process
> cannot be killed by the root. A hard reset is the only resolution to
> get my system functioning normally, but without the raid-1 of course.
> The problem seems to emerge only with the combination of RAID and
> Reiser4.  I've created an ext-2 filesystem on /dev/md/0, and after
> that mount ; cp -ax ; umount works without  a problem, and the
> hanging umount re-appears when using Reiser4 again.
>
> My questions:
> - how can I find the cause of the hanging umount?
> - how can I fix it?
>
> A few details of my linux-box:
>
> Gentoo Linux, 2.6.16 kernel with Reiser4-for-2.6.16-2.patch.gz
> i686 AMD Athlon(tm) XP 2400+
> DC4300 SATA-II controller (Silicon Image 3124, libata + sata_sil24
> drivers) 2 x Samsung SP2504C hard disk
>
> I've posted this issue to the linux-kernel mailing list, but Neil
> Brown
>
> wrote:
> > This looks very much like a reiser4 problem rather than a raid
> > problem, or at least you will need someone very familiar with
> > reiser4 to understand what is going on here.
>
> So here's my post.
>
> The call trace of the hanging umount is the following:
> > syslog-ng     R running     0  7581      1                7197
> > (NOTLB) umount        D C011B591     0  7588   7200                
> >     (NOTLB) f6643c98 00000000 c1808320 c011b591 f7db5ad0 f4d18c00
> > 003d092a 00000000 00000000 f7db5ad0 c1808320 00000000 f4d18c00
> > 003d092a f6b33540 c1808320 00000000 f4d18c00 003d092a f6b33540
> > f6b33668 c1808320 00000000 f6643cfc Call Trace:
> > [<c011b591>] __wake_up_common+0x41/0x70
> > [<c0318346>] io_schedule+0x26/0x30
> > [<c01469fb>] sync_page+0x4b/0x60
> > [<c03184d5>] __wait_on_bit+0x45/0x70
> > [<c01469b0>] sync_page+0x0/0x60
> > [<c014726d>] wait_on_page_bit+0xad/0xc0
> > [<c0136a30>] wake_bit_function+0x0/0x60
> > [<c0136a30>] wake_bit_function+0x0/0x60
> > [<c01ac2f9>] jwait_io+0x59/0x80
> > [<c01c1763>] update_journal_header+0x83/0xb0
> > [<c01c272a>] commit_tx+0xca/0x110
> > [<c01c29a1>] reiser4_write_logs+0x141/0x1e0
> > [<c01b9d91>] commit_current_atom+0x171/0x2c0
> > [<c01baabf>] try_commit_txnh+0x13f/0x1e0
> > [<c01bab94>] commit_txnh+0x34/0xd0
> > [<c01b91bc>] txn_end+0x2c/0x30
> > [<c01b91d0>] txn_restart+0x10/0x30
> > [<c01b920a>] txn_restart_current+0x1a/0x20
> > [<c01b9f1f>] force_commit_atom+0x3f/0x70
> > [<c01ba03a>] txnmgr_force_commit_all+0xea/0x130
> > [<c01fcb0e>] release_format40+0x7e/0x150
> > [<c01b5ea8>] init_context+0x58/0x80
> > [<c01c8b89>] reiser4_put_super+0x89/0xf0
> > [<c01857ed>] invalidate_inodes+0x5d/0x80
> > [<c0170fb6>] generic_shutdown_super+0x156/0x160
> > [<c0171b2d>] kill_block_super+0x2d/0x50
> > [<c0170d90>] deactivate_super+0x60/0x80
> > [<c0188e1f>] sys_umount+0x3f/0x90
> > [<c01171b0>] do_page_fault+0x1c0/0x5a8
> > [<c0159bc1>] sys_munmap+0x51/0x80
> > [<c0188e87>] sys_oldumount+0x17/0x20
> > [<c010306b>] sysenter_past_esp+0x54/0x75
>
> Thanx in advance,
>
> Arend
>
>
>
>
> !DSPAM:447b56ed69838791294130!

-- 
Alex.