Bug#922306: linux: btrfs corruption (compressed data + hole data)

From	Christoph Anton Mitterer <calestyo@scientia.net>
Newsgroups	linux.debian.bugs.rc
Subject	Bug#922306: linux: btrfs corruption (compressed data + hole data)
Date	2019-02-14 13:40 +0100
Message-ID	<xrot3-6GD-7@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Source: linux
Version: 4.19.20-1
Severity: critical
Tags: upstream patch
Justification: causes serious data loss

Hi.

Apparently there was a longer existing data corruption bug in btrfs[0],
AFAIU it happened when compression was used together with holes in data
and there was *no* recognition by checksumming.

Seems some movement got into this the last days and a patch[1] may have
been found fixing the issue.


Due to potential silent data corruptpion it makes perhaps sense to
cherry pick that fix (maybe waiting for confirmation from upstream
whether it's the final one) instead of waiting for it being released
in some upcoming stable release?

Cheers,
Chris.


[0] https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg85407.html
[1] https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg85492.html


-- System Information:
Debian Release: buster/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-3-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_DE.UTF-8, LC_CTYPE=en_DE.UTF-8 (charmap=UTF-8), LANGUAGE=en_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

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Bug#922306: linux: btrfs corruption (compressed data + hole data) Christoph Anton Mitterer <calestyo@scientia.net> - 2019-02-14 13:40 +0100
  Bug#922306: linux: btrfs corruption (compressed data + hole data) Christoph Anton Mitterer <calestyo@scientia.net> - 2019-02-14 16:50 +0100
  Bug#922306: linux: btrfs corruption (compressed data + hole data) Salvatore Bonaccorso <carnil@debian.org> - 2019-02-24 09:50 +0100
  Processed: Re: Bug#922306: linux: btrfs corruption (compressed  data + hole data) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2019-02-24 09:50 +0100
  Processed: Re: Bug#922306: linux: btrfs corruption (compressed  data + hole data) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2019-02-26 21:30 +0100
  Bug#922306: linux: btrfs corruption (compressed data + hole data) Salvatore Bonaccorso <carnil@debian.org> - 2019-03-14 20:30 +0100

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