Re: [Devel] [PATCH hci-8.1 v2 0/3] dm-ploop: fix flip_upper_deltas panicking the host in its pre-flip check

From: Konstantin Khorenko <khorenko@virtuozzo.com>
To: "Denis V. Lunev" <den@openvz.org>
Cc: devel@openvz.org
Subject: Re: [Devel] [PATCH hci-8.1 v2 0/3] dm-ploop: fix flip_upper_deltas panicking the host in its pre-flip check
Date: Thu, 05 Nov 2026 19:19:24 +0100	[thread overview]
Message-ID: <179390276466.2948524.7014567228246329015.b4-ty@b4> (raw)
In-Reply-To: <20261105145749.2643035-1-den@openvz.org>

On Thu, 05 Nov 2026 15:57:46 +0100, Denis V. Lunev wrote:
> dm-ploop: fix flip_upper_deltas panicking the host in its pre-flip check
> 
> ploop_check_delta_before_flip() runs on every flip_upper_deltas, as
> PLOOP_DEBUG is always defined in dm-ploop-cmd.c, and has three bugs
> (VSTOR-153445):
> 
> - patch 1: when it finds a cluster both deltas map, it returns -EEXIST
>   with two md_locks held and interrupts disabled. The next pio on that
>   BAT page spins on the lock forever, and the host panics on a hard
>   lockup;
> 
> [...]

Applied to branch-rh10-6.12.0-211.52.1.22.x.vz10-ovz, will be released in rh10-6.12.0-211.52.1.22.19.vz10, thanks!

[1/3] dm-ploop: fix flip_upper_deltas returning with two md_locks held
      https://bitbucket.org/virtuozzocore/vzkernel.vzs/commits/e47cf5cfc4c9
[2/3] dm-ploop: refuse flip_upper_deltas onto a lower delta smaller than the device
      https://bitbucket.org/virtuozzocore/vzkernel.vzs/commits/18c4383f77c9
[3/3] dm-ploop: fix the flip_upper_deltas check skipping the last BAT entry
      https://bitbucket.org/virtuozzocore/vzkernel.vzs/commits/f0cff9cebdb0

-- 
Konstantin Khorenko,
Virtuozzo Linux Kernel Team

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