print_req_error: I/O error, dev loop0, sector 72
Buffer I/O error on dev loop0, logical block 9, lost async page write
WARNING: CPU: 0 PID: 4479 at fs/buffer.c:1079 mark_buffer_dirty+0x555/0x6b0 fs/buffer.c:1079
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 4479 Comm: syzkaller958588 Not tainted 4.16.0+ #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 panic+0x22f/0x4de kernel/panic.c:184
 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:991
RIP: 0010:mark_buffer_dirty+0x555/0x6b0 fs/buffer.c:1079
RSP: 0018:ffff8801aa8a7058 EFLAGS: 00010293
RAX: ffff8801af19a4c0 RBX: ffff8801aa594150 RCX: ffffffff81cb40bf
RDX: 0000000000000000 RSI: ffffffff81cb4565 RDI: 0000000000000007
RBP: ffff8801aa8a7168 R08: ffff8801af19a4c0 R09: ffffea0006bc1b00
R10: ffffed0035e0d9ff R11: ffff8801af06cfff R12: 1ffff10035514e0c
R13: 0000000000000000 R14: ffff8801aa8a7140 R15: dffffc0000000000
 __block_commit_write.isra.35+0x19a/0x390 fs/buffer.c:2031
 block_write_end+0xa5/0x260 fs/buffer.c:2109
 blkdev_write_end+0xc5/0x2d0 fs/block_dev.c:593
 generic_perform_write+0x4c9/0x6a0 mm/filemap.c:3151
 __generic_file_write_iter+0x3be/0x5e0 mm/filemap.c:3265
 blkdev_write_iter+0x233/0x420 fs/block_dev.c:1910
 call_write_iter include/linux/fs.h:1784 [inline]
 do_iter_readv_writev+0x6a0/0x970 fs/read_write.c:680
 do_iter_write+0x185/0x5f0 fs/read_write.c:959
 vfs_iter_write+0x77/0xb0 fs/read_write.c:972
 iter_file_splice_write+0x8cb/0xff0 fs/splice.c:749
 do_splice_from fs/splice.c:851 [inline]
 direct_splice_actor+0x128/0x190 fs/splice.c:1018
 splice_direct_to_actor+0x310/0x8d0 fs/splice.c:973
 do_splice_direct+0x2cc/0x400 fs/splice.c:1061
 do_sendfile+0x60f/0xe00 fs/read_write.c:1440
 SYSC_sendfile64 fs/read_write.c:1495 [inline]
 SyS_sendfile64+0xdf/0x190 fs/read_write.c:1487
 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x449a59
RSP: 002b:00007efdef906ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00000000006dbc24 RCX: 0000000000449a59
RDX: 0000000020000000 RSI: 0000000000000014 RDI: 0000000000000013
RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000080000000007 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff9b9fb0df R14: 00007efdef9079c0 R15: 0000000000000001
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..