[FS#494] NETDEV WATCHDOG: ptm0 (): transmit queue 0 timed out

[LEDE Bugs]

The following task has a new comment added:

FS#494 - NETDEV WATCHDOG: ptm0 (): transmit queue 0 timed out
User who did this - Mathias Kresin (mkresin)

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I can confirm the issue. I'm seeing the same using vdsl + ptm + vlan but never heard of someone else having these problems. I was the opinion it is related to my local (development) changes.

Sometimes it does work for weeks, sometimes it does work only for days. Never found a way to trigger the warning/crash.

And I can confirm that only after a reboot the pppoe discover works again. Simply unloading the ptm kernel module or similar does not work.

After the warning is shown and the pppoe discovery doesn't work any longer, things like querying the ptm carrier state fail as well:


root at LEDE:~# cat /sys/devices/virtual/net/ptm0/carrier
cat: read error: Invalid argument


If tried different xdsl firmware version to make sure that it's not related to a crash of the xdsl firmware.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=494#comment1698