We had this again last night. It hit the 14.04 machine again. This bug
seems to prefer this special VM...

librbd/ExclusiveLock.cc: In function 'std::__cxx11::string 
librbd::ExclusiveLock<ImageCtxT>::encode_lock_cookie() const [with ImageCtxT = 
librbd::ImageCtx; std::__cxx11::string = std::__cxx11::basic_string<char>]' 
thread 7efe88abfc00 time 2016-08-03 22:40:44.069765
librbd/ExclusiveLock.cc: 217: FAILED assert(m_watch_handle != 0)
 ceph version 10.2.2 (45107e21c568dd033c2f0a3107dec8f0b0e58374)
 1: (()+0x28d5d0) [0x7efe703335d0]
 2: (()+0x8c785) [0x7efe70132785]
 3: (()+0x8deab) [0x7efe70133eab]
 4: (()+0x8d6c7) [0x7efe701336c7]
 5: (()+0x74167) [0x7efe7011a167]
 6: (()+0x7456d) [0x7efe7011a56d]
 7: (rbd_aio_write()+0x4c) [0x7efe701067fc]
 8: (()+0x2359) [0x7efe7999c359]
 9: (()+0x241b) [0x7efe7999c41b]
 10: (()+0x495ada) [0x564d75434ada]
 11: (()+0x49809d) [0x564d7543709d]
 12: (()+0x498a87) [0x564d75437a87]
 13: (()+0x4633b6) [0x564d754023b6]
 14: (()+0x49809d) [0x564d7543709d]
 15: (()+0x498a87) [0x564d75437a87]
 16: (()+0x499730) [0x564d75438730]
 17: (()+0x4dd5ca) [0x564d7547c5ca]
 18: (()+0x4a590) [0x7efe83724590]
 NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to 
interpret this.

Might this correlate with creating snapshots or reading from them?
Because 4 seconds prior to this error, we took a snapshot of this block
device and created a rbd diff --whole-diff between the old snapshot and
the new snapshot...

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https://bugs.launchpad.net/bugs/1607694

Title:
  Exclusive-Lock Issue

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