netdev - Re: [PATCH net 1/3] devlink: hold region lock when flushing snapshots

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Date:   Thu, 15 Dec 2022 09:38:15 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com,
        pabeni@...hat.com, jacob.e.keller@...el.com, jiri@...dia.com
Subject: Re: [PATCH net 1/3] devlink: hold region lock when flushing snapshots

Thu, Dec 15, 2022 at 03:01:00AM CET, kuba@...nel.org wrote:
>Netdevsim triggers a splat on reload, when it destroys regions
>with snapshots pending:
>
>  WARNING: CPU: 1 PID: 787 at net/core/devlink.c:6291 devlink_region_snapshot_del+0x12e/0x140
>  CPU: 1 PID: 787 Comm: devlink Not tainted 6.1.0-07460-g7ae9888d6e1c #580
>  RIP: 0010:devlink_region_snapshot_del+0x12e/0x140
>  Call Trace:
>   <TASK>
>   devl_region_destroy+0x70/0x140
>   nsim_dev_reload_down+0x2f/0x60 [netdevsim]
>   devlink_reload+0x1f7/0x360
>   devlink_nl_cmd_reload+0x6ce/0x860
>   genl_family_rcv_msg_doit.isra.0+0x145/0x1c0
>
>This is the locking assert in devlink_region_snapshot_del(),
>we're supposed to be holding the region->snapshot_lock here.
>
>Fixes: 2dec18ad826f ("net: devlink: remove region snapshots list dependency on devlink->lock")
>Signed-off-by: Jakub Kicinski <kuba@...nel.org>

Ooup.

Thanks for the fix.

Reviewed-by: Jiri Pirko <jiri@...dia.com>