In my case the workaround works.
It is not the whole device ccmni0 blocked - only transmission with a huge
number of errors:
/var/log/syslog:
.
Aug 3 17:42:06 ubuntu-phablet kernel: [43904.216292][ccci/net] (1)CCMNI0 TX
busy and stop queue: q_idx=32, skb->len=70
Aug 3 17:42:06 ubuntu-phablet kernel: [43904.216326][ccci/net] (1) TX
read_out = 0 avai_out = 32 avai_in = 32
Aug 3 17:42:06 ubuntu-phablet kernel: [43904.216352][ccci/net] (1) RX
read_out = 0 avai_out = 0 avai_in = 99
.
[Repeating serveral times]
.
Output of ifconfig:
ccmni0 Link encap:Ethernet Hardware Adresse c2:75:ba:b8:fd:3e
inet Adresse:10.79.248.38 Maske:255.255.255.0
UP RUNNING NOARP MTU:1500 Metrik:1
RX-Pakete:21543 Fehler:0 Verloren:0 Überläufe:0 Fenster:0
TX-Pakete:17009 Fehler:8017 Verloren:0 Überläufe:0 Träger:0
Kollisionen:0 Sendewarteschlangenlänge:1000
RX-Bytes:15643461 (15.6 MB) TX-Bytes:1860544 (1.8 MB)
.
(massive transmission errors: "Fehler:8017")
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https://bugs.launchpad.net/bugs/1607079
Title:
Cellular Option immediately crashes [OTA-12]
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