[highbank] hvc0 getty causes random hangs
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
finish-install (Ubuntu) |
Fix Released
|
High
|
dann frazier | ||
Raring |
Fix Released
|
High
|
dann frazier | ||
Saucy |
Fix Released
|
High
|
dann frazier | ||
linux (Ubuntu) |
Fix Released
|
High
|
Paolo Pisati | ||
Raring |
Won't Fix
|
High
|
Paolo Pisati | ||
Saucy |
Won't Fix
|
High
|
Paolo Pisati |
Bug Description
After doing a fresh install of raring, I've observed several issues across multiple systems, and they all seem to be correlated with the hvc0 upstart job (hvc0 getty) running.
One symptom I've seen on both machines is that the network goes unresponsive for several seconds before recovering. If I run a ping, I see a pattern of 84-85s of responses, followed by about 41s of failures.
The khvcd process consumes a lot of CPU - often 100% of a processor.
Processes seem to randomly hang and are seemingly unrecoverable. I ran an apt-get install that never emitted any output, but remained hung until I rebooted the system.
When I try to kill the hvc0 upstart job (sudo stop hvc0 - or a kill -9), the process does not die.
One one of the two hosts, I observed the console getty (ttyAMA0) successfully starting, but never providing a login prompt to the console. Restarting this process didn't help solve the problem.
Disabling the hvc0 upstart job and rebooting reliably makes these problems go away.
Related branches
Changed in linux (Ubuntu): | |
importance: | Undecided → High |
Changed in linux (Ubuntu): | |
assignee: | nobody → Paolo Pisati (p-pisati) |
tags: | added: highbank |
tags: | added: raring |
Changed in finish-install (Ubuntu): | |
status: | New → Confirmed |
importance: | Undecided → High |
assignee: | nobody → dann frazier (dannf) |
Changed in linux (Ubuntu Raring): | |
status: | Confirmed → Triaged |
status: | Triaged → In Progress |
milestone: | none → raring-updates |
Changed in finish-install (Ubuntu Raring): | |
status: | Confirmed → Fix Released |
Changed in linux (Ubuntu): | |
milestone: | raring-updates → saucy-updates |
Changed in linux (Ubuntu): | |
status: | In Progress → Fix Released |
[ 0.000000] Linux version 3.8.0-19-generic (buildd@alnasl) (gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-1ubuntu1) ) #29-Ubuntu SMP Wed Apr 17 18:22:15 UTC 2013 (Ubuntu 3.8.0-19.29-generic 3.8.8)