Date: Fri, 5 Nov 2004 15:45:31 +0100 (CET) From: Stijn Hoop <stijn@win.tue.nl> To: FreeBSD-gnats-submit@FreeBSD.org Cc: Lukas Ertl <le@FreeBSD.org> Subject: kern/73579: data corruption on striped geom_vinum volume Message-ID: <200411051445.iA5EjV6Q001541@pcwin002.win.tue.nl> Resent-Message-ID: <200411052020.iA5KKguF056908@freefall.freebsd.org>
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>Number: 73579 >Category: kern >Synopsis: data corruption on striped geom_vinum volume >Confidential: no >Severity: serious >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri Nov 05 20:20:41 GMT 2004 >Closed-Date: >Last-Modified: >Originator: Stijn Hoop >Release: FreeBSD 6.0-CURRENT i386 >Organization: >Environment: System: FreeBSD 6.0-CURRENT #0: Fri Nov 5 12:50:21 CET 2004 >Description: I'm seeing data corruption on a freshly created striped geom_vinum volume, with a fresh -CURRENT. Verification of the same file yields different checksums: [stijn@pcwin002] </local/storage> md5 testfile MD5 (testfile) = 1af4c4d4bd34128548f9052327bfc717 [stijn@pcwin002] </local/storage> md5 testfile MD5 (testfile) = 208118b38cd382c2273f00f26a1f3c73 >How-To-Repeat: - create a striped geom_vinum volume. The fresh test was done with this configuration file: %%% drive meg device ad4s1e drive herc device ad6s1e volume storage plex org striped 479k sd len * drive meg sd len * drive herc %%% but my initial volume that exhibited the problem had a stripe size of 279k. - newfs with default paramaters + softupdates - create a (large) testfile, I used sudo dd if=/dev/urandom of=testfile bs=1m count=1024 - create a checksum, twice, and witness the result above. Note how the checksums differ even though no process has since written to or modified the file. Drives are fine, checksumming data read from the raw device consistently gives the same result. >Fix: n/a >Release-Note: >Audit-Trail: >Unformatted:
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