Process perl (pid: 20791, threadinfo ffff8101b12aa000, task ffff8101ee9ac860)
Stack:  0000000000000001 0000000000000000 ffff81012f59d1b8 ffffffff802b841d
 0000000000000000 ffff81012f59d1b8 0000000000000000 0000000000001000
 0000000000000000 ffffffff802b8fb2 0000000000000000 ffffffff802b95b8
Call Trace:
 [] __find_get_block_slow+0x2f/0xf1
 [] unmap_underlying_metadata+0x6/0x37
 [] __block_prepare_write+0x1af/0x36d
 [] ext3_get_block+0x0/0xe4
 [] block_write_begin+0x79/0xcd
 [] ext3_write_begin+0xeb/0x1ab
 [] ext3_get_block+0x0/0xe4
                  [] generic_file_buffered_write+0x153/0x66b
 [] __generic_file_aio_write_nolock+0x33e/0x3a8
 [] sock_common_recvmsg+0x30/0x45
 [] generic_file_aio_write+0x61/0xc1
 [] ext3_file_write+0x16/0x94
 [] do_sync_write+0xc9/0x10c
 [] autoremove_wake_function+0x0/0x2e
 [] __dequeue_entity+0x1c/0x32
 [] vfs_write+0xad/0x136
 [] sys_write+0x45/0x6e

 [] system_call+0x7e/0x83


Code: 48 8b 00 48 89 ca 25 00 40 02 00 48 3d 00 40 02 00 75 04 48 
RIP  [] find_get_page+0x29/0x51
 RSP 
---[ end trace eb8dc33d0a183bb4 ]---