From: Konstantin Khorenko <khorenko@virtuozzo.com>
To: "Denis V. Lunev" <den@openvz.org>
Cc: devel@openvz.org
Subject: Re: [Devel] [PATCH vz10-latest 1/1] openvswitch: fix soft lockup in the netlink dump callbacks #VSTOR-144650
Date: Tue, 15 Sep 2026 22:42:04 +0200 [thread overview]
Message-ID: <178950492496.2412229.2603262189008554175.b4-review@b4> (raw)
In-Reply-To: <20260915114849.3869609-1-den@openvz.org>
On Tue, 15 Sep 2026 13:48:49 +0200, Denis V. Lunev <den@openvz.org> wrote:
> A production compute node carrying a few thousand datapath flows and
> ports hit a soft lockup inside a single netlink flow dump and panicked.
>
> ovs_flow_cmd_dump() calls ovs_flow_stats_get() for every flow it
> emits, and that releases stats->lock with spin_unlock_bh() once per
> CPU that has touched the flow. ovs_vport_cmd_dump() calls
> peernet2id_alloc() for every vport that lives in a foreign netns, and
> that releases nsid_lock with spin_unlock_bh(). Every release is a
> local_bh_enable(), and each one runs the pending softirq backlog in
> the dumping thread's own context.
>
> [...]
Reviewed-by: Konstantin Khorenko <khorenko@virtuozzo.com>
--
Konstantin Khorenko <khorenko@virtuozzo.com>
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next prev parent reply other threads:[~2026-09-15 20:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-15 11:48 Denis V. Lunev
2026-09-15 20:42 ` Konstantin Khorenko [this message]
2026-09-16 9:59 ` Konstantin Khorenko
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