Bug#915666: linux: data corruption with blk-mq

[Christoph Anton Mitterer <calestyo@scientia.net>]

Source: linux
Version: 4.18.20-2
Severity: critical
Tags: upstream patch
Justification: causes serious data loss


Hi.

There's a bug in the blk-mq schedulers which may cause serious data
curruption...
See https://bugzilla.kernel.org/show_bug.cgi?id=201685

Seems like a patch was made recently,... maybe it would make sense
to cherry pick that one before it makes its way via the stable kernels.

AFAIU the discussions, at least 4.18 may be affected as well.


Cheers,
Chris.


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

Kernel: Linux 4.18.0-3-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)