3.16.3 hung on btrfs_evict_inode+0x13e/0x3fd

INFO: task jhead:16654 blocked for more than 120 seconds.
      Tainted: G        W  O  3.16.3-amd64-i915-preempt-20140714fm1 #1

"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
jhead D ffff8802f7e6d060 0 16654 15616 0x20020080
ffff88023c797d00 0000000000000086 ffff88016da19c60 ffff88023c797fd8 ffff8801cc9da2d0 00000000000140c0 ffff88016da19c60 ffff8801dbbdb0a4 0000000000178000 ffff88023c797d78 ffff8801dbbdb088 ffff88023c797d10

Call Trace:
 [<ffffffff8163ab89>] schedule+0x6e/0x70
 [<ffffffff8124c492>] lock_extent_bits+0x10a/0x192
 [<ffffffff81087b7c>] ? finish_wait+0x65/0x65
 [<ffffffff8123e03e>] btrfs_evict_inode+0x13e/0x3fd
 [<ffffffff8117556a>] evict+0xac/0x153
 [<ffffffff81175b8d>] iput+0x129/0x132
 [<ffffffff8116c9d2>] do_unlinkat+0x135/0x1ce
 [<ffffffff810a4aba>] ? current_kernel_time+0xe/0x32
 [<ffffffff810cb5e0>] ? __audit_syscall_entry+0xa6/0xc8
 [<ffffffff8101acdf>] ? syscall_trace_enter+0x184/0x1fd
 [<ffffffff8116d79f>] SyS_unlink+0x16/0x18
 [<ffffffff81640929>] ia32_do_call+0x13/0x13

sysrq dump here if that helps:
http://marc.merlins.org/tmp/sysrq-3.16.3.txt

Marc

"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/                         | PGP 1024R/763BE901