as you can see i checked:
4.4.0-040400rc6-generic
and compiled btrfs-tooles btrfs-progs v4.3.1 from git source.
same bug.
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https://bugs.launchpad.net/bugs/1528177
Title:
14.04.3 - b
apport information
** Package changed: linux-lts-wily (Ubuntu) => linux (Ubuntu)
** Tags added: apport-collected
** Description changed:
[ 480.220058] INFO: task kworker/u16:1:85 blocked for more than 120 seconds.
[ 480.220067] Not tainted 4.2.0-21-generic #25~14.04.1-Ubuntu
[ 48
[ 579.578508] perf interrupt took too long (2507 > 2500), lowering
kernel.perf_event_max_sample_rate to 5
[ 600.236051] INFO: task kworker/u16:1:68 blocked for more than 120 seconds.
[ 600.236060] Not tainted 4.4.0-040400rc6-generic #201512202030
[ 600.236062] "echo 0 > /proc/sys/ker