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

[LEDE Bugs]

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FS#494 - NETDEV WATCHDOG: ptm0 (): transmit queue 0 timed out
User who did this - Carl-Daniel Hailfinger (hailfinger)

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With o2 ADSL (Annex B) I'm seeing this usually within 4 minutes after boot. I don't even get an initial PPPoE connection established before everything falls over.

syslog is attached.
Output from dsl_control follows.
root at LEDE:~# /etc/init.d/dsl_control status
ATU-C Vendor ID:                          Broadcom 147.158
ATU-C System Vendor ID:                   00,00,30,30,30,30,00,00
Chipset:                                  Lantiq-VRX200 Unknown
Firmware Version:                         5.7.4.4.0.2
API Version:                              4.17.18.6
XTSE Capabilities:                        0x0, 0x0, 0x0, 0x0, 0x0, 0x4, 0x0, 0x0
Annex:                                    B
Line Mode:                                G.992.5 (ADSL2+)
Profile:                                  
Line State:                               UP [0x801: showtime_tc_sync]
Forward Error Correction Seconds (FECS):  Near: 0 / Far: 178461
Errored seconds (ES):                     Near: 0 / Far: 7808
Severely Errored Seconds (SES):           Near: 0 / Far: 1913
Loss of Signal Seconds (LOSS):            Near: 0 / Far: 8
Unavailable Seconds (UAS):                Near: 48 / Far: 48
Header Error Code Errors (HEC):           Near: 0 / Far: 608262
Non Pre-emtive CRC errors (CRC_P):        Near: 0 / Far: 0
Pre-emtive CRC errors (CRCP_P):           Near: 0 / Far: 0
Power Management Mode:                    L0 - Synchronized
Latency / Interleave Delay:               Down: Interleave (8.0 ms) / Up: Interleave (8.0 ms)
Data Rate:                                Down: 10.988 Mb/s / Up: 1.150 Mb/s
Line Attenuation (LATN):                  Down: 20.8dB / Up: 7.8dB
Signal Attenuation (SATN):                Down: 19.0dB / Up: 8.0dB
Noise Margin (SNR):                       Down: 9.2dB / Up: 9.4dB
Aggregate Transmit Power (ACTATP):        Down: 18.6dB / Up: 12.6dB
Max. Attainable Data Rate (ATTNDR):       Down: 11.104 Mb/s / Up: 1.234 Mb/s
Line Uptime Seconds:                      625
Line Uptime:                              10m 25s

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https://bugs.lede-project.org/index.php?do=details&task_id=494#comment1847