1TITLE: INFO: task hung in iterate_bdevs 2 3[ 615.391254] INFO: task syz-executor5:10045 blocked for more than 120 seconds. 4[ 615.398657] Not tainted 4.13.0-rc1+ #4 5[ 615.403147] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 6[ 615.411181] syz-executor5 D23584 10045 3045 0x00000004 7[ 615.416901] Call Trace: 8[ 615.419521] __schedule+0x8e8/0x2070 9[ 615.423294] ? find_held_lock+0x35/0x1d0 10[ 615.452695] schedule+0x108/0x440 11[ 615.456212] ? wait_on_page_bit_common+0x4a9/0x7f0 12[ 615.482851] io_schedule+0x1c/0x70 13[ 615.486414] wait_on_page_bit_common+0x4c7/0x7f0 14[ 615.495766] ? jbd2_log_wait_commit+0x345/0x420 15[ 615.530975] ? pagevec_lookup_tag+0x3a/0x80 16[ 615.535375] __filemap_fdatawait_range+0x23f/0x390 17[ 615.567092] ? down_read+0x96/0x150 18[ 615.570758] filemap_fdatawait_keep_errors+0x80/0x110 19[ 615.575974] fdatawait_one_bdev+0x50/0x70 20[ 615.580151] iterate_bdevs+0x109/0x260 21[ 615.584054] ? sync_inodes_one_sb+0x50/0x50 22[ 615.588430] sys_sync+0x122/0x1c0 23[ 615.591894] ? sync_filesystem+0x2e0/0x2e0 24[ 615.601208] ? trace_hardirqs_on_thunk+0x1a/0x1c 25[ 615.606028] entry_SYSCALL_64_fastpath+0x1f/0xbe 26[ 615.610818] RIP: 0033:0x4512c9 27[ 615.614042] RSP: 002b:00007f4d6c47fc08 EFLAGS: 00000216 ORIG_RAX: 00000000000000a2 28[ 615.621807] RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 00000000004512c9 29[ 615.629146] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 30[ 615.636484] RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 31[ 615.643830] R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004b6f8f 32[ 615.651186] R13: 00000000ffffffff R14: 0000000000000000 R15: 0000000000000000 33