[Bug 1171582] [NEW] [highbank] hvc0 getty causes random hangs

Launchpad Bug Tracker 1171582 at bugs.launchpad.net
Tue Apr 23 20:16:05 UTC 2013


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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.

** Affects: finish-install (Ubuntu)
     Importance: High
     Assignee: dann frazier (dannf)
         Status: Confirmed

** Affects: linux (Ubuntu)
     Importance: High
     Assignee: Paolo Pisati (p-pisati)
         Status: In Progress

** Affects: finish-install (Ubuntu Raring)
     Importance: High
     Assignee: dann frazier (dannf)
         Status: Confirmed

** Affects: linux (Ubuntu Raring)
     Importance: High
     Assignee: Paolo Pisati (p-pisati)
         Status: In Progress


** Tags: highbank patch raring verification-done
-- 
[highbank] hvc0 getty causes random hangs
https://bugs.launchpad.net/bugs/1171582
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