netdev - Re: bnxt_en: NETDEV WATCHDOG in 6.13-rc7

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Message-ID: <CACKFLik4bdefMtUe_CjKcQuekadPj+kqExUnNrim2qiyyhG-QQ@mail.gmail.com>
Date: Fri, 17 Jan 2025 09:44:12 -0800
From: Michael Chan <michael.chan@...adcom.com>
To: Breno Leitao <leitao@...ian.org>
Cc: pavan.chebbi@...adcom.com, netdev@...r.kernel.org, kuba@...nel.org, 
	kernel-team@...a.com
Subject: Re: bnxt_en: NETDEV WATCHDOG in 6.13-rc7

On Fri, Jan 17, 2025 at 4:08 AM Breno Leitao <leitao@...ian.org> wrote:

>          Showing all locks held in the system:

>          7 locks held by kworker/u144:3/208:
>          4 locks held by kworker/u144:4/290:
>           #0: ffff88811db39948 ((wq_completion)bnxt_pf_wq){+.+.}-{0:0}, at: process_one_work+0x1090/0x1950
>           #1: ffffc9000303fda0 ((work_completion)(&bp->sp_task)){+.+.}-{0:0}, at: process_one_work+0x7eb/0x1950
>           #2: ffffffff86f71208 (rtnl_mutex){+.+.}-{4:4}, at: bnxt_reset+0x30/0xa0
>           #3: ffff88811e41d160 (&bp->hwrm_cmd_lock){+.+.}-{4:4}, at: __hwrm_send+0x2f6/0x28d0

Since there is TX timeout, we will call bnxt_reset() from
bnxt_sp_task() workqueue.  rtnl_lock will be held and we will hold the
hwrm_cmd_lock mutex for every command we send to the firmware.
Perhaps there is a problem communicating with the firmware.  This will
cause the firmware command to timeout in about a second with these
locks held.  We send many commands to the firmware and this can take a
while if firmware is not responding.

>          3 locks held by kworker/u144:6/322:
>           #0: ffff88810812a948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1090/0x1950
>           #1: ffffc90003a4fda0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7eb/0x1950
>           #2: ffffffff86f71208 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60

Meanwhile linkwatch is trying to get the rtnl_lock.

>
>
> Full log at https://pastebin.com/4pWmaayt
>

I will take a closer look at the full log today.  Thanks.

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