[ZFS] Potential silent data corruption when receiving incremental stream with block size change on receiving side

[Shiva Bhanujan]

Hi Eric,

thanks for the pointer.  I tried the patch and it works.

regards,
Shiva

________________________________
From: Eric Borisch [eborisch at gmail.com]
Sent: Tuesday, October 01, 2019 5:03 PM
To: Shiva Bhanujan
Cc: Fabian Keil; freebsd-fs at freebsd.org
Subject: Re: [ZFS] Potential silent data corruption when receiving incremental stream with block size change on receiving side

That sounds like a potential hole birth issue.

You might consider upgrading to at least 10.4 or 11.1 and re-trying the send; these added the vfs.zfs.send_holes_without_birth_time (default true/1) tunable to avoid "numerous hole_birth bugs". See this [1] commit.

  - Eric

[1] https://svnweb.freebsd.org/base/releng/10.4/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_traverse.c?revision=308086&view=markup

On Tue, Oct 1, 2019 at 5:51 PM Shiva Bhanujan <Shiva.Bhanujan at quorum.com<mailto:Shiva.Bhanujan at quorum.com>> wrote:
Hello,

This seems to be an older email, but I seem to be hitting this in FreeBSD 10.3.  Following is the precise version -

FreeBSD R530-Filer-20-194.quorum.net<http://R530-Filer-20-194.quorum.net> 10.3-RELEASE-p29 FreeBSD 10.3-RELEASE-p29 #12 r335461M: Wed Jun 20 16:11:04 PDT 2018     root at R520-31-232.quorum.net:/usr/obj/usr/src/sys/QUORUM  amd64

When I send an incremental snapshot, the md5sum of a couple of the files in the source and the destination don't match.  The previous incrementals don't have a mismatch.

Can somebody please advise on what I should be looking for?  I've checked the URLs mentioned here.  The addition or removal of the -L option doesn't have any change.

Regards,
Shiva


________________________________
From: owner-freebsd-fs at freebsd.org<mailto:owner-freebsd-fs at freebsd.org> [owner-freebsd-fs at freebsd.org<mailto:owner-freebsd-fs at freebsd.org>] on behalf of Fabian Keil [freebsd-listen at fabiankeil.de<mailto:freebsd-listen at fabiankeil.de>]
Sent: Monday, August 07, 2017 8:10 AM
To: freebsd-fs at freebsd.org<mailto:freebsd-fs at freebsd.org>
Subject: [ZFS] Potential silent data corruption when receiving incremental stream with block size change on receiving side

The original message is attached because it is signed.
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