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Transmit queue timed out on eth0 causing netdev watchdog

Question asked by Charles Ung on Aug 22, 2016
Latest reply on Feb 7, 2017 by Jim Brooke

On our imx6q board running kernel 3.14.52-1.1.0_ga (commit 5f6f0a5), we have encountered a case that the transmit queue timing out on eth0. I did a search on the web and found a thread on the boundary forum that is very similar to this but it was more than 3 years ago and the patch was done on a much older kernel. So I just want to know is there something wrong in the fec driver that is causing this? If so, is there a patch available that can fix this problem?

 

 

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WARNING: CPU: 0 PID: 0 at /yocto/iteris-2.0/build/tmp/work-shared/ccu6/kernel-source/net/sched/sch_generic.c:264 dev_watchdog+0x260/0x26c()

NETDEV WATCHDOG: eth0 (fec): transmit queue 0 timed out

Modules linked in: loadfpga(O) virtual_fb(O) mxc_v4l2_capture ipu_bg_overlay_sdc ipu_still ipu_prp_enc ipu_csi_enc tvp5147(O) v4l2_int_device ipu_fg_overlay_sdc evbug mxc_dcic galcore(O)

CPU: 0 PID: 0 Comm: swapper/0 Tainted: G           O 3.14.52-1.1.0_ga+g5f6f0a5 #1

[<800158e4>] (unwind_backtrace) from [<800123d4>] (show_stack+0x10/0x14)

[<800123d4>] (show_stack) from [<806eed4c>] (dump_stack+0x7c/0xbc)

[<806eed4c>] (dump_stack) from [<8002f660>] (warn_slowpath_common+0x6c/0x88)

[<8002f660>] (warn_slowpath_common) from [<8002f6ac>] (warn_slowpath_fmt+0x30/0x40)

[<8002f6ac>] (warn_slowpath_fmt) from [<805944bc>] (dev_watchdog+0x260/0x26c)

[<805944bc>] (dev_watchdog) from [<80039848>] (call_timer_fn.isra.8+0x24/0x84)

[<80039848>] (call_timer_fn.isra.8) from [<80039a10>] (run_timer_softirq+0x168/0x1ec)

[<80039a10>] (run_timer_softirq) from [<8003368c>] (__do_softirq+0x140/0x244)

[<8003368c>] (__do_softirq) from [<80033a6c>] (irq_exit+0xb8/0xf4)

[<80033a6c>] (irq_exit) from [<8000f990>] (handle_IRQ+0x44/0x90)

[<8000f990>] (handle_IRQ) from [<8000856c>] (gic_handle_irq+0x2c/0x5c)

[<8000856c>] (gic_handle_irq) from [<80012ec0>] (__irq_svc+0x40/0x70)

Exception stack(0x80a11f20 to 0x80a11f68)

1f20: 80a11f68 3b9aca00 7d4a167b 000269c2 bf7250d0 80a1e7c8 7d49a533 000269c2

1f40: 00000000 00000000 80a10000 00000000 00000017 80a11f68 00000009 804b4808

1f60: 000f0013 ffffffff

[<80012ec0>] (__irq_svc) from [<804b4808>] (cpuidle_enter_state+0x50/0xe4)

[<804b4808>] (cpuidle_enter_state) from [<804b4950>] (cpuidle_idle_call+0xb4/0x150)

[<804b4950>] (cpuidle_idle_call) from [<8000fce0>] (arch_cpu_idle+0x8/0x44)

[<8000fce0>] (arch_cpu_idle) from [<8006ab10>] (cpu_startup_entry+0x100/0x14c)

[<8006ab10>] (cpu_startup_entry) from [<809bfb2c>] (start_kernel+0x350/0x35c)

---[ end trace bbaf3f4e344cdb53 ]---

 

I have attached the full log as an attachment which has the dump of the tx ring buffer.

 

Thanks,

Charles

Original Attachment has been moved to: net_timeout_issue.log.zip

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