Buffer I/O error on dev loop0, logical block 3, lost async page write
INFO: task syz-executor0:9221 blocked for more than 120 seconds.
      Not tainted 4.4.114-ga81d322 #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D ffff8800bbaf7240 26440  9221   9088 0x20020004
 ffff8800bbaf7240 ffff8800ab0ce8d0 0000000000000024 ffff8800ab0ce000
 ffffffff842bdbe0 0000000000000000 ffff8801db31fdb8 ffff8801db31fde0
 ffff8801db31f4d8 ffff8801d9b49800 ffff8800ab0ce000 ffff8800bbaf77e0
Call Trace:
 [<ffffffff83765dba>] schedule+0x7a/0x1b0 kernel/sched/core.c:3353
 [<ffffffff837710d0>] schedule_timeout+0x3a0/0x970 kernel/time/timer.c:1515
 [<ffffffff83763d4e>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:4935
 [<ffffffff8376707b>] io_schedule include/linux/sched.h:447 [inline]
 [<ffffffff8376707b>] bit_wait_io+0x1b/0xc0 kernel/sched/wait.c:595
 [<ffffffff837667bc>] __wait_on_bit+0x8c/0x140 kernel/sched/wait.c:395
 [<ffffffff8141d545>] wait_on_page_bit+0x1e5/0x210 mm/filemap.c:758
 [<ffffffff8141d733>] wait_on_page_writeback include/linux/pagemap.h:530 [inline]
 [<ffffffff8141d733>] __filemap_fdatawait_range+0x1c3/0x2e0 mm/filemap.c:410
 [<ffffffff8141d875>] filemap_fdatawait_range+0x25/0x50 mm/filemap.c:440
 [<ffffffff81423a44>] filemap_write_and_wait_range+0x74/0xb0 mm/filemap.c:539
 [<ffffffff815cfe86>] blkdev_fsync+0x66/0xb0 fs/block_dev.c:355
 [<ffffffff815bcf2a>] vfs_fsync_range+0x10a/0x250 fs/sync.c:195
 [<ffffffff815d15a8>] generic_write_sync include/linux/fs.h:2497 [inline]
 [<ffffffff815d15a8>] blkdev_write_iter+0x398/0x490 fs/block_dev.c:1658
 [<ffffffff8151cc07>] vfs_iter_write+0x1c7/0x2d0 fs/read_write.c:364
 [<ffffffff815b824a>] iter_file_splice_write+0x58a/0xae0 fs/splice.c:1024
 [<ffffffff815b4c25>] do_splice_from fs/splice.c:1128 [inline]
 [<ffffffff815b4c25>] direct_splice_actor+0x125/0x180 fs/splice.c:1294
 [<ffffffff815b5f32>] splice_direct_to_actor+0x2d2/0x830 fs/splice.c:1247
 [<ffffffff815b6637>] do_splice_direct+0x1a7/0x270 fs/splice.c:1337
 [<ffffffff81520d3c>] do_sendfile+0x54c/0xd30 fs/read_write.c:1227
 [<ffffffff81522ef1>] C_SYSC_sendfile fs/read_write.c:1303 [inline]
 [<ffffffff81522ef1>] compat_SyS_sendfile+0xd1/0x160 fs/read_write.c:1292
 [<ffffffff81006d74>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d74>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff8377586a>] sysenter_flags_fixed+0xd/0x17
no locks held by syz-executor0/9221.
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 485 Comm: khungtaskd Not tainted 4.4.114-ga81d322 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bb368000 task.stack: ffff8800bb3c8000
RIP: 0010:[<ffffffff810c3d57>]  [<ffffffff810c3d57>] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810c3d57>]  [<ffffffff810c3d57>] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810c3d57>]  [<ffffffff810c3d57>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810c3d57>]  [<ffffffff810c3d57>] flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800bb3cfcb8  EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8800bb3cfce0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000003 R14: ffffffff8426f3a0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000181e000 CR3: 00000000b4de6000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8426f3a0 ffffffff847ef700 fffffbfff08fd994 dffffc0000000000
 ffff8801db31bca0 ffff8800bb3cfd00 ffffffff810b988b ffffffff839f6180
 0000000000000003 ffff8800bb3cfd60 ffffffff81d0e8b4 0000000000000000
Call Trace:
 [<ffffffff810b988b>] nmi_raise_cpu_backtrace+0x5b/0x70 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81d0e8b4>] nmi_trigger_all_cpu_backtrace+0x4a4/0x550 lib/nmi_backtrace.c:85
 [<ffffffff810b9924>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff81368cba>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff81368cba>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81368cba>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81368cba>] watchdog+0x6fa/0xae0 kernel/hung_task.c:238
 [<ffffffff811907d8>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff83774305>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:506
Code: b3 5f ff f6 c4 10 75 e1 44 89 e8 c1 e0 18 89 04 25 10 b3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 b3 5f ff <41> f7 c4 00 02 00 00 74 1a e8 6b 30 17 00 4c 89 e7 57 9d 0f 1f 
NMI backtrace for cpu 1
CPU: 1 PID: 3900 Comm: rs:main Q:Reg Not tainted 4.4.114-ga81d322 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800bb8d4800 task.stack: ffff8800aa4b0000
RIP: 0010:[<ffffffff811ffffc>]  [<ffffffff811ffffc>] idle_balance kernel/sched/fair.c:9279 [inline]
RIP: 0010:[<ffffffff811ffffc>]  [<ffffffff811ffffc>] pick_next_task_fair+0x54c/0x2220 kernel/sched/fair.c:7097
RSP: 0018:ffff8800aa4b77a8  EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffff8801d9b01400 RCX: 1ffffffff08fd6b1
RDX: 0000000000000000 RSI: ffffffff839fe320 RDI: ffff8800bb8d50cc
RBP: ffff8800aa4b78b0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff10015496ec0 R12: ffff8801d9b01400
R13: ffff8801db31f4c0 R14: dffffc0000000000 R15: 000000010000185f
FS:  00007ffa63bc3700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c4201a9e80 CR3: 00000000b4de6000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff811fff48 1ffff10015496f05 ffff8800bb8d4800 0000000000000001
 fffffbfff0841200 ffff8801db31f578 ffff8801db31f530 ffff8801db31fe68
 ffff8801db31fe90 ffffed001771aa19 ffff8801db31f4d8 ffff8801db31f4d8
Call Trace:
 [<ffffffff83764237>] pick_next_task kernel/sched/core.c:3176 [inline]
 [<ffffffff83764237>] __schedule+0x317/0x1ca0 kernel/sched/core.c:3306
 [<ffffffff83765dba>] schedule+0x7a/0x1b0 kernel/sched/core.c:3353
 [<ffffffff812db597>] freezable_schedule include/linux/freezer.h:171 [inline]
 [<ffffffff812db597>] futex_wait_queue_me+0x307/0x5d0 kernel/futex.c:2205
 [<ffffffff812dc0cf>] futex_wait+0x20f/0x610 kernel/futex.c:2320
 [<ffffffff812e0fd7>] do_futex+0x7c7/0x15d0 kernel/futex.c:3102
 [<ffffffff812e1fe8>] SYSC_futex kernel/futex.c:3162 [inline]
 [<ffffffff812e1fe8>] SyS_futex+0x208/0x2c0 kernel/futex.c:3130
 [<ffffffff83773edf>] entry_SYSCALL_64_fastpath+0x1c/0x98
Code: 89 f8 48 c1 e8 03 42 80 3c 30 00 0f 85 ba 1b 00 00 48 8b 9b 48 09 00 00 e8 42 5e 08 00 85 c0 49 89 dc 74 0d 80 3d ad a4 5d 03 00 <0f> 84 3d 04 00 00 48 85 db 0f 84 d0 08 00 00 48 c7 85 70 ff ff