As 3.16 is claimed to be ok this is fixed in the development tree.
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1425128
Title:
bcache causes task hang with 3.13 kernel
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Trusty:
Confirmed
Bug description:
We're doing some testing of bcache to see how it improves block
performance in trusty; right now we're hitting a problem where
processes performing filesystem operations get hung on the default
3.13 kernel:
[ 7083.029073] INFO: task qemu-img:96548 blocked for more than 120 seconds.
[ 7083.035797] Not tainted 3.13.0-45-generic #74-Ubuntu
[ 7083.041325] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
we don't see the same issue if we switch to the 3.16 hwe kernel.
Fairly easy to reproduce so can try test kernels - will also try to
get a bit more debug for you on this one.
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