Date: Sun, 06 Jun 2004 22:33:16 +0900 From: Jun Kuriyama <kuriyama@imgsrc.co.jp> To: Kirk McKusick <mckusick@beastie.mckusick.com> Cc: Frode Nordahl <frode@nordahl.net> Subject: Re: UFS snapshot deadlocks Message-ID: <7moenw4xr7.wl@black3.imgsrc.co.jp> In-Reply-To: <B25DE1CD-B638-11D8-B9FB-000A95A9A574@nordahl.net> References: <B25DE1CD-B638-11D8-B9FB-000A95A9A574@nordahl.net>
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At Fri, 4 Jun 2004 15:06:55 +0000 (UTC),
Frode Nordahl wrote:
> The following is a 100% reproducible procedure to make it happen:
>
> Running 5.2-CURRENT #0: Fri Jun 4 15:07:54 CEST 2004
>
> tty1:
> while (1)
> ls -la /usr/.snap
> end
>
> tty2:
> dump -0af /some/where -C 32 -L /dev/ad0s1f
I can also reproduce this with above steps.
FWIW, I did them with debug.snapdebug=1. It looks we are in the deadlock between mksnap_ffs and ls...
-----
ffs_snapgone: lost snapshot vnode 1346
ffs_snapshot: busy vnode: 0xc1354924: tag ufs, type VDIR, usecount 1, writecount 0, refcount 1, flags (VV_ROOT|VV_OBJBUF), lock type ufs: EXCL (count 1) by thread 0xc12ff420 (pid 870)
ino 2, on dev ad0s1e (4, 16)
### go to debugger ###
db> ps
pid proc uarea uid ppid pgrp flag stat wmesg wchan cmd
874 c12fec08 c9e16000 1021 562 874 0004002 [SLPQ ufs 0xc1356bd8][SLP] ls
870 c13f1370 ca01a000 0 869 866 0004002 [SLPQ ufs 0xc14ad3b8][SLP] mksnap_ffs
...
db> show lockedvnods
Locked vnodes
0xc14ad30c: tag ufs, type VDIR, usecount 3, writecount 0, refcount 2, flags (VV_OBJBUF), lock type ufs: EXCL (count 1) by thread 0xc12ff9a0 (pid 874) with 1 pending
ino 3, on dev ad0s1e (4, 16)
0xc1356b2c: tag ufs, type VREG, usecount 2, writecount 0, refcount 16, lock type ufs: EXCL (count 1) by thread 0xc12ff420 (pid 870) with 1 pending
ino 1347, on dev ad0s1e (4, 16)
--
Jun Kuriyama <kuriyama@imgsrc.co.jp> // IMG SRC, Inc.
<kuriyama@FreeBSD.org> // FreeBSD Project
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