netdev - NETDEV WATCHDOG: enp1s0 (r8169): transmit queue 0 timed out

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Message-ID: <YgY7LW8WLtTCZUu0@Red>
Date:   Fri, 11 Feb 2022 11:32:13 +0100
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     hkallweit1@...il.com, swsd@...ltek.com, davem@...emloft.net,
        kuba@...nel.org, thierry.reding@...il.com, jonathanh@...dia.com
Cc:     linux-tegra@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: NETDEV WATCHDOG: enp1s0 (r8169): transmit queue 0 timed out

Hello

On my tegra124-jetson-tk1, I always got:
[ 1311.064826] ------------[ cut here ]------------
[ 1311.064880] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:477 dev_watchdog+0x2fc/0x300
[ 1311.064976] NETDEV WATCHDOG: enp1s0 (r8169): transmit queue 0 timed out
[ 1311.065011] Modules linked in:
[ 1311.065074] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.16.7-dirty #7
[ 1311.065116] Hardware name: NVIDIA Tegra SoC (Flattened Device Tree)
[ 1311.065177] [<c01103e4>] (unwind_backtrace) from [<c010ade0>] (show_stack+0x10/0x14)
[ 1311.065253] [<c010ade0>] (show_stack) from [<c0bbe884>] (dump_stack_lvl+0x40/0x4c)
[ 1311.065322] [<c0bbe884>] (dump_stack_lvl) from [<c0122d6c>] (__warn+0xd0/0x12c)
[ 1311.065379] [<c0122d6c>] (__warn) from [<c0bb8c48>] (warn_slowpath_fmt+0x90/0xb4)
[ 1311.065434] [<c0bb8c48>] (warn_slowpath_fmt) from [<c0a0f0f0>] (dev_watchdog+0x2fc/0x300)
[ 1311.065493] [<c0a0f0f0>] (dev_watchdog) from [<c01a8ab0>] (call_timer_fn+0x34/0x1a8)
[ 1311.065554] [<c01a8ab0>] (call_timer_fn) from [<c01a8e50>] (__run_timers.part.0+0x22c/0x328)
[ 1311.065599] [<c01a8e50>] (__run_timers.part.0) from [<c01a8f84>] (run_timer_softirq+0x38/0x68)
[ 1311.065648] [<c01a8f84>] (run_timer_softirq) from [<c0101394>] (__do_softirq+0x124/0x3cc)
[ 1311.065732] [<c0101394>] (__do_softirq) from [<c0129ff4>] (irq_exit+0xa4/0xd4)
[ 1311.065818] [<c0129ff4>] (irq_exit) from [<c0100b90>] (__irq_svc+0x50/0x80)
[ 1311.065860] Exception stack(0xc1101ed8 to 0xc1101f20)
[ 1311.065884] 1ec0:                                                       00000000 00000001
[ 1311.065913] 1ee0: c110a800 00000060 00000001 eed889f8 c121eaa0 418a949d 00000001 00000131
[ 1311.065940] 1f00: 00000001 00000131 00000000 c1101f28 c08bbe20 c08bbee8 60000113 ffffffff
[ 1311.065962] [<c0100b90>] (__irq_svc) from [<c08bbee8>] (cpuidle_enter_state+0x270/0x480)
[ 1311.066031] [<c08bbee8>] (cpuidle_enter_state) from [<c08bc15c>] (cpuidle_enter+0x50/0x54)
[ 1311.066078] [<c08bc15c>] (cpuidle_enter) from [<c015a658>] (do_idle+0x1e0/0x298)
[ 1311.066133] [<c015a658>] (do_idle) from [<c015a9e0>] (cpu_startup_entry+0x18/0x1c)
[ 1311.066174] [<c015a9e0>] (cpu_startup_entry) from [<c1000fc8>] (start_kernel+0x678/0x6bc)
[ 1311.066242] ---[ end trace 3df1a997f30c7eb8 ]---
[ 1311.083269] r8169 0000:01:00.0 enp1s0: rtl_rxtx_empty_cond == 0 (loop: 42, delay: 100).
[ 2671.118597] r8169 0000:01:00.0 enp1s0: rtl_rxtx_empty_cond == 0 (loop: 42, delay: 100).
[27521.391461] r8169 0000:01:00.0 enp1s0: rtl_rxtx_empty_cond == 0 (loop: 42, delay: 100).
[47441.629280] r8169 0000:01:00.0 enp1s0: rtl_rxtx_empty_cond == 0 (loop: 42, delay: 100).
[49046.691475] r8169 0000:01:00.0 enp1s0: rtl_rxtx_empty_cond == 0 (loop: 42, delay: 100).
[53081.713430] r8169 0000:01:00.0 enp1s0: rtl_rxtx_empty_cond == 0 (loop: 42, delay: 100).
[55101.737951] r8169 0000:01:00.0 enp1s0: rtl_rxtx_empty_cond == 0 (loop: 42, delay: 100).
[59351.771382] r8169 0000:01:00.0 enp1s0: rtl_rxtx_empty_cond == 0 (loop: 42, delay: 100).
[60491.797371] r8169 0000:01:00.0 enp1s0: rtl_rxtx_empty_cond == 0 (loop: 42, delay: 100).
[61351.805499] r8169 0000:01:00.0 enp1s0: rtl_rxtx_empty_cond == 0 (loop: 42, delay: 100).
[69631.911327] r8169 0000:01:00.0 enp1s0: rtl_rxtx_empty_cond == 0 (loop: 42, delay: 100).
[71246.958267] r8169 0000:01:00.0 enp1s0: rtl_rxtx_empty_cond == 0 (loop: 42, delay: 100).
[86522.110241] r8169 0000:01:00.0 enp1s0: rtl_rxtx_empty_cond == 0 (loop: 42, delay: 100).
[88507.174307] r8169 0000:01:00.0 enp1s0: rtl_rxtx_empty_cond == 0 (loop: 42, delay: 100).
[104612.315286] r8169 0000:01:00.0 enp1s0: rtl_rxtx_empty_cond == 0 (loop: 42, delay: 100).
[132797.695339] r8169 0000:01:00.0 enp1s0: rtl_rxtx_empty_cond == 0 (loop: 42, delay: 100).

This happen since at least 5.10.
Any idea on how to debug this ?

Regards