Date: Sat, 15 Jul 2006 21:55:00 -0400 (EDT) From: "Stephen J. Roznowski" <sjr@comcast.net> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/100365: snapshots on busy filesystem fail Message-ID: <200607160155.k6G1t0dU076031@istari.comcast.net> Resent-Message-ID: <200607160200.k6G20Wjt087325@freefall.freebsd.org>
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>Number: 100365 >Category: kern >Synopsis: snapshots on busy filesystem fail >Confidential: no >Severity: critical >Priority: high >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sun Jul 16 02:00:31 GMT 2006 >Closed-Date: >Last-Modified: >Originator: Stephen J. Roznowski >Release: FreeBSD 6.1-STABLE amd64 >Organization: >Environment: System: FreeBSD 6.1-STABLE FreeBSD 6.1-STABLE #3: Sat Jul 8 22:34:39 EDT 2006 >Description: Taking snapshots while creating/deleting directories leads to corrupted snapshots. >How-To-Repeat: I'm running the following script as root: #!/bin/sh FS=/usr/ports for i in 1 2 3 4 5 6 7 8 9 10 do echo $i mksnap_ffs $FS $FS/.snap/snapshot fsck_ffs $FS/.snap/snapshot /bin/rm -f $FS/.snap/snapshot done If the filesystem is quiet, the script completes without errors. In another window, I'm running the following: # mkdir /usr/ports/.a # cd /usr/ports/.a # while (1) > mkdir a b c d e f g h i j k l m n o p > rmdir a b c d e f g h i j k l m n o p > sleep 1 > end Now, when I run the previous script, occasionally I'll get snapshots that are corrupt when the fsck is checking them. [Appears to be about 50% of the time....] Additionally, I'm seeing the following error: mksnap_ffs: Cannot create /usr/ports/.snap/snapshot: Resource temporarily unavailable /usr/ports/.snap/snapshot is not a disk device and dmesg shows: fsync: giving up on dirty 0xffffff002fcee9b0: tag devfs, type VCHR usecount 1, writecount 0, refcount 635 mountedhere 0xffffff0000e7c600 flags () v_object 0xffffff002ff5a460 ref 0 pages 2556 lock type devfs: EXCL (count 1) by thread 0xffffff002ac52260 (pid 71385) dev ad0s1f fsync: giving up on dirty 0xffffff002fcee9b0: tag devfs, type VCHR usecount 1, writecount 0, refcount 634 mountedhere 0xffffff0000e7c600 flags () v_object 0xffffff002ff5a460 ref 0 pages 2552 lock type devfs: EXCL (count 1) by thread 0xffffff002ac52260 (pid 71385) dev ad0s1f I can provide more system configuration details if needed. >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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