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[Sean Clarke <sean.clarke@xxxxxxxxxxxxxxxxxxxx>]

Situation is intolerable, crashed 2nd time in 12 hrs:

top - 12:06:37 up  1:51,  1 user,  load average: 3.33, 0.87, 0.33
Tasks: 226 total,   5 running, 221 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.0 us, 48.5 sy,  0.0 ni, 50.9 id,  0.1 wa,  0.0 hi,  0.5 si,  0.0 st
KiB Mem:  12295372 total, 12138296 used,   157076 free,      312 buffers
KiB Swap:  7831536 total,       56 used,  7831480 free,    24644 cached

  PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND                                                 
 1005 root      20   0     0    0    0 R 100.1  0.0   0:50.16 btrfs-transacti                                         
 2462 root      20   0     0    0    0 R  75.8  0.0   0:06.66 btrfs-flush_del                                         
 2459 root      20   0     0    0    0 S  72.5  0.0   0:10.18 btrfs-flush_del                                         
 2463 root      20   0     0    0    0 S  70.5  0.0   0:14.41 btrfs-flush_del                                         
 2457 root      20   0     0    0    0 R  38.6  0.0   0:28.35 btrfs-flush_del                                         
 2458 root      20   0     0    0    0 S  17.0  0.0   0:39.31 btrfs-flush_del                                         
 1959 root      20   0     0    0    0 R   9.6  0.0   0:31.68 btrfs-flush_del                                         
  100 root      20   0     0    0    0 S   7.6  0.0   0:00.31 kswap

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https://bugs.launchpad.net/bugs/1237794

Title:
  hard lockup on filserver

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Hi,
      My Core i7 18TB BTRFS file server has been upgraded to 13.10 and since doing so locks up frequently.  Previously it never crashed and was only taken down for maintenance, Monday we upgraded to 13.10 and since then it locks up ever 20hrs or so. We were doing a large backup last night and it locked up within 6 or so hrs.

  On the 1st occurrence absolutely nothing was in the logs, on the 2nd
  occurrence there was some NFS hang messages, when system comes back up
  I will check and post any logging information gleaned.

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