Issue

• xfs_fsr crashes the system
• Experiencing system crashes with the following signature:

BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
      IP: [<ffffffffa0248fb4>] xfs_trans_log_inode+0x14/0x40 [xfs]
      [...] 
      Modules linked in: mpt2sas raid_class mptctl ipmi_devintf ipmi_si ipmi_msghandler nfs lockd fscache nfs_acl auth_rpcgss sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf bonding ipv6 xfs exportfs microcode serio_raw i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support e1000e ioatdma i7core_edac edac_core sg ses enclosure myri10ge dca ext3 jbd mbcache dm_round_robin sd_mod crc_t10dif ahci mptsas mptscsih mptbase scsi_transport_sas megaraid_sas dm_multipath dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan]

      Pid: 9641, comm: xfs_fsr Not tainted 2.6.32-220.4.2.el6.x86_64 #1 SGI.COM ISS3500/X8DT6
      RIP: 0010:[<ffffffffa0248fb4>]  [<ffffffffa0248fb4>] xfs_trans_log_inode+0x14/0x40 [xfs]
      [...]
      Call Trace:
       [<ffffffffa020da20>] xfs_bunmapi+0x6d0/0x850 [xfs]
       [<ffffffffa0230520>] xfs_itruncate_finish+0x150/0x330 [xfs]
       [<ffffffffa024c0e1>] xfs_inactive+0x311/0x460 [xfs]
       [<ffffffffa0259730>] xfs_fs_clear_inode+0xa0/0xd0 [xfs]
       [<ffffffff81190def>] clear_inode+0x8f/0x110
       [<ffffffff81191596>] generic_delete_inode+0x196/0x1d0
       [<ffffffff81191635>] generic_drop_inode+0x65/0x80
       [<ffffffff811904b2>] iput+0x62/0x70
       [<ffffffff8118d010>] dentry_iput+0x90/0x100
       [<ffffffff8118d171>] d_kill+0x31/0x60
       [<ffffffff8118eb9c>] dput+0x7c/0x150
       [<ffffffff81177db9>] __fput+0x189/0x210
       [<ffffffff81177e65>] fput+0x25/0x30
       [<ffffffff811738ad>] filp_close+0x5d/0x90
       [<ffffffff81173985>] sys_close+0xa5/0x100
       [<ffffffff8100b0f2>] system_call_fastpath+0x16/0x1b
      [...]