Issue

• Whenever user attempted to use docker in RHEL 6, server panics with tracebacks similar to the following

         CPUS: 24
         DATE: Wed Apr 29 22:31:47 2015
       UPTIME: 00:09:29
 LOAD AVERAGE: 0.49, 0.53, 0.40
        TASKS: 1250
     NODENAME: somehost
      RELEASE: 2.6.32-431.23.3.el6.x86_64
      VERSION: #1 SMP Wed Jul 16 06:12:23 EDT 2014
      MACHINE: x86_64  (2666 Mhz)
       MEMORY: 96 GB
        PANIC: "kernel BUG at drivers/md/persistent-data/dm-btree-remove.c:353!"
          PID: 2986
      COMMAND: "dm-thin"
         TASK: ffff881811958040  [THREAD_INFO: ffff88180875e000]
          CPU: 7
        STATE: TASK_RUNNING (PANIC)
 crash> bt
 PID: 2986   TASK: ffff881811958040  CPU: 7   COMMAND: "dm-thin"
  #0 [ffff88180875f6b0] machine_kexec at ffffffff81038f3b
  #1 [ffff88180875f710] crash_kexec at ffffffff810c5bc2
  #2 [ffff88180875f7e0] oops_end at ffffffff8152c800
  #3 [ffff88180875f810] die at ffffffff81010e0b
  #4 [ffff88180875f840] do_trap at ffffffff8152c064
  #5 [ffff88180875f8a0] do_invalid_op at ffffffff8100cf95
  #6 [ffff88180875f940] invalid_op at ffffffff8100bf9b
     [exception RIP: remove_raw+2021]
     RIP: ffffffffa05efe75  RSP: ffff88180875f9f0  RFLAGS: 00010212
     RAX: ffff880c0b96f000  RBX: ffff88180875fb20  RCX: 00000000000000ee
     RDX: ffff880c0b96f000  RSI: ffff880c13fd3000  RDI: ffff880c13fd3000
     RBP: ffff88180875fae0   R8: ffff880c0c4fc000   R9: 0000000000000150
     R10: 00000000000000d7  R11: 0000000000000055  R12: ffff88180870c0b0
     R13: ffff88180875faa8  R14: ffff880b40dd5000  R15: 0000000000001ebb
     ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
  #7 [ffff88180875fae8] dm_btree_remove at ffffffffa05eff50 [dm_persistent_data]
  #8 [ffff88180875fb88] sm_ll_mutate at ffffffffa05ebc9b [dm_persistent_data]
  #9 [ffff88180875fc28] sm_ll_dec at ffffffffa05ebcfa [dm_persistent_data]
 #10 [ffff88180875fc38] sm_disk_dec_block at ffffffffa05ec20a [dm_persistent_data]
 #11 [ffff88180875fc58] data_block_dec at ffffffffa0602e6e [dm_thin_pool]
 #12 [ffff88180875fc78] dm_btree_remove at ffffffffa05effa0 [dm_persistent_data]
 #13 [ffff88180875fd18] dm_thin_remove_block at ffffffffa06039e7 [dm_thin_pool]
 #14 [ffff88180875fd58] process_prepared_discard at ffffffffa05ff6a2 [dm_thin_pool]
 #15 [ffff88180875fd78] process_prepared at ffffffffa05fd2e7 [dm_thin_pool]
 #16 [ffff88180875fdb8] do_worker at ffffffffa0600fd0 [dm_thin_pool]
 #17 [ffff88180875fe38] worker_thread at ffffffff81094a20
 #18 [ffff88180875fee8] kthread at ffffffff8109abf6
 #19 [ffff88180875ff48] kernel_thread at ffffffff8100c20a

• other crash tracebacks have been observed - the exact signature varies
• usually includes dm_thin_remove_block in the traceback