Reproduced this on a vivid VM. All of the failing processes are hanging
sending data to a unix domain socket.
Tracked this down to a bad backport applied to the kernel:
commit 5981b6969d649a4fe1d402c915eb751c1243410c
Author: Joseph Salisbury <joseph.salisb...@canonical.com>
Date: Fri Mar 4 14:33:47 2016 -0500
Revert "af_unix: Revert 'lock_interruptible' in stream receive code"
This is missing a removal of a mutex_lock() in the second stanza.
Looking at what was reviewed and acked this was present in that version.
Possibly this was damaged in application due to the presence of the
commit below:
commit 0c0b98c6005644d1d00c8b91fbb0cea0032f99b2
Author: Rainer Weikusat <rweiku...@mobileactivedefense.com>
Date: Mon Feb 8 18:47:19 2016 +0000
af_unix: Don't set err in unix_stream_read_generic unless there was an error
Which appears to actually be the proper fix for the issue the revert is
attempting to fix.
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https://bugs.launchpad.net/bugs/1558447
Title:
vivid/linux: total ADT test failures
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Vivid:
New
Bug description:
vivid/linux is hanging ADT test en-toto. We seem to lose sshd, the
console log ends thus:
Ubuntu 15.04 adt ttyS0
adt login: [ 240.080182] INFO: task sshd:693 blocked for more than 120
seconds.
[ 240.081937] Not tainted 3.19.0-57-generic #63-Ubuntu
[ 240.083413] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 240.085791] INFO: task sshd:760 blocked for more than 120 seconds.
[ 240.087441] Not tainted 3.19.0-57-generic #63-Ubuntu
[ 240.088939] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 240.091099] INFO: task sshd:763 blocked for more than 120 seconds.
[ 240.092776] Not tainted 3.19.0-57-generic #63-Ubuntu
[ 240.094232] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 240.096431] INFO: task sshd:765 blocked for more than 120 seconds.
[ 240.098060] Not tainted 3.19.0-57-generic #63-Ubuntu
[ 240.099514] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
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