FILE: mm/filemap.c

INFO: task syz-executor6:9207 blocked for more than 120 seconds.
      Not tainted 4.15.0-rc2-next-20171208+ #63
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor6   D21264  9207   3394 0x80000002
Call Trace:
 context_switch kernel/sched/core.c:2800 [inline]
 __schedule+0x8eb/0x2060 kernel/sched/core.c:3376
 schedule+0xf5/0x430 kernel/sched/core.c:3435
 io_schedule+0x1c/0x70 kernel/sched/core.c:5043
 wait_on_page_bit_common mm/filemap.c:1099 [inline]
 __lock_page+0x585/0x740 mm/filemap.c:1272
 lock_page include/linux/pagemap.h:483 [inline]
 truncate_inode_pages_range+0x1945/0x1f90 mm/truncate.c:452
 truncate_inode_pages+0x24/0x30 mm/truncate.c:482
 kill_bdev+0xbc/0xf0 fs/block_dev.c:86
 __blkdev_put+0x183/0x7c0 fs/block_dev.c:1764
 blkdev_put+0x85/0x4f0 fs/block_dev.c:1835
 blkdev_close+0x91/0xc0 fs/block_dev.c:1842
 __fput+0x333/0x7f0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ae0 kernel/exit.c:869
 do_group_exit+0x149/0x400 kernel/exit.c:972
 get_signal+0x73f/0x16c0 kernel/signal.c:2337
 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:161
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x94/0x96