From: Konstantin Khorenko <khorenko@virtuozzo.com>
To: "Denis V. Lunev" <den@openvz.org>
Cc: devel@openvz.org
Subject: Re: [Devel] [PATCH hci-8.1 1/4] dm-ploop: fix pio submission racing with the suspend and resume of a cmd
Date: Wed, 04 Nov 2026 18:14:19 +0100 [thread overview]
Message-ID: <179381245947.2686233.4128969536870407704.b4-review@b4> (raw)
In-Reply-To: <20261103083642.130885-2-den@openvz.org>
I won't apply this version, please send v2 with the change below.
On Tue, 03 Nov 2026 09:36:39 +0100, Denis V. Lunev wrote:
> - a pio that passed the check before the flag was set takes its ref on
> the new index or on the already killed old one. The cmd does not
> wait for it, and it runs while a merge, resize or delta index update
> rewrites the BAT levels and deltas[];
Item 1 of the cover letter reply: add notify_merged to that list.
Why: ploop_delta_clusters_merged() stops submission the same way and
renumbers deltas[], so it is hit by the same race. The code is fine,
the RCU section and the grace period before the index switch close
both races.
With that fixed:
Reviewed-by: Konstantin Khorenko <khorenko@virtuozzo.com>
--
Konstantin Khorenko,
Virtuozzo Linux Kernel Team
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next prev parent reply other threads:[~2026-11-04 17:15 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-03 8:36 [Devel] [PATCH hci-8.1 0/4] dm-ploop: fix the pio submission stop around cmds Denis V. Lunev
2026-11-03 8:36 ` [Devel] [PATCH hci-8.1 1/4] dm-ploop: fix pio submission racing with the suspend and resume of a cmd Denis V. Lunev
2026-11-03 8:40 ` no-reply
2026-11-04 17:14 ` Konstantin Khorenko [this message]
2026-11-03 8:36 ` [Devel] [PATCH hci-8.1 2/4] dm-ploop: fix a lost wakeup of the ploop_allocator() thread Denis V. Lunev
2026-11-03 8:39 ` no-reply
2026-11-04 17:14 ` Konstantin Khorenko
2026-11-03 8:36 ` [Devel] [PATCH hci-8.1 3/4] dm-ploop: wait for the ploop_allocator() thread before changing deltas[] Denis V. Lunev
2026-11-03 8:42 ` no-reply
2026-11-04 17:14 ` Konstantin Khorenko
2026-11-03 8:36 ` [Devel] [PATCH hci-8.1 4/4] dm-ploop: fix a failed cluster copy on grow leaving the BAT page busy Denis V. Lunev
2026-11-03 8:42 ` no-reply
2026-11-04 17:14 ` Konstantin Khorenko
2026-11-04 13:24 ` [Devel] [PATCH hci-8.1 0/4] dm-ploop: fix the pio submission stop around cmds Andrey Zhadchenko
2026-11-04 17:14 ` Konstantin Khorenko
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