Date: Wed, 21 Oct 2009 01:34:56 GMT From: Carl Chave <online@chave.us> To: freebsd-gnats-submit@FreeBSD.org Subject: amd64/139806: Write attempt to file in ZFS snapshot dir causes panic Message-ID: <200910210134.n9L1Yu2m034218@www.freebsd.org> Resent-Message-ID: <200910210140.n9L1e2C5023743@freefall.freebsd.org>
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>Number: 139806 >Category: amd64 >Synopsis: Write attempt to file in ZFS snapshot dir causes panic >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-amd64 >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed Oct 21 01:40:02 UTC 2009 >Closed-Date: >Last-Modified: >Originator: Carl Chave >Release: 8.0-RC1-amd64-dvd1.iso >Organization: >Environment: 8.0-RC1-amd64-dvd1.iso booted to Fixit environment in vmware. >Description: Attempting to modify a file in a zfs snapshot directory causes kernel panic with the following message: panic: dirtying snapshot! Maybe related to this PR: http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/138764 >How-To-Repeat: 1. load zfs from bootloader prompt and then boot. 2. enter fixit environment. 3. import zpool (in this case a 2 disk vmware mirror named sodpool) 4. cd to previously created snapshot at sodpool/test/myfs/.zfs/snapshot/one 5. attempting to create a new file here results in: Fixit# echo hello > hello.txt cannot create hello.txt: Read-only file system 6. That seems like the desired response. Next, attempt to modify a file that already exists in the snapshot: Fixit# echo hello >> test.txt panic: dirtying snapshot! >Fix: Unknown >Release-Note: >Audit-Trail: >Unformatted:
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