print_req_error: I/O error, dev loop0, sector 40
print_req_error: I/O error, dev loop0, sector 48
print_req_error: I/O error, dev loop0, sector 56
print_req_error: I/O error, dev loop0, sector 64
print_req_error: I/O error, dev loop0, sector 72
WARNING: CPU: 1 PID: 14655 at fs/buffer.c:1079 mark_buffer_dirty+0x319/0x470 fs/buffer.c:1109
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 14655 Comm: syz-executor.1 Not tainted 4.18.0-rc7-syzkaller #0
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+0x109/0x15a lib/dump_stack.c:113
 panic+0x1c6/0x36b kernel/panic.c:184
 __warn.cold.8+0x120/0x168 kernel/panic.c:536
 report_bug+0x1a4/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x200/0x350 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:mark_buffer_dirty+0x319/0x470 fs/buffer.c:1079
Code: 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 07 01 00 00 49 8b 3c 24 be 04 00 00 00 e8 30 f1 fd ff 5b 41 5c 41 5d 41 5e 5d c3 <0f> 0b e9 14 fd ff ff 0f 0b e9 22 fd ff ff 0f 0b e9 f3 fd ff ff e8 
RSP: 0018:ffff880083347488 EFLAGS: 00010246
RAX: 000000000000092c RBX: ffff880097bc6348 RCX: 0000000000000001
RDX: 1ffff10012f78c69 RSI: 0000000000000000 RDI: ffff880097bc6348
RBP: ffff8800833474a8 R08: 0000000000001000 R09: ffffea00024ca580
R10: dffffc0000000000 R11: ffff880093297000 R12: dffffc0000000000
R13: 0000000000001000 R14: ffff880097bc6348 R15: 0000000000000000
 __block_commit_write.isra.36+0xdf/0x200 fs/buffer.c:2031
 block_write_end+0x2e/0xf0 fs/buffer.c:2109
 blkdev_write_end+0x14/0xf0 fs/block_dev.c:594
 generic_perform_write+0x33d/0x480 mm/filemap.c:3150
 __generic_file_write_iter+0x201/0x580 mm/filemap.c:3264
 blkdev_write_iter+0x1c7/0x390 fs/block_dev.c:1914
 call_write_iter include/linux/fs.h:1793 [inline]
 do_iter_readv_writev+0x49c/0x940 fs/read_write.c:680
 do_iter_write+0x12b/0x520 fs/read_write.c:959
 vfs_iter_write+0x5b/0xb0 fs/read_write.c:972
 iter_file_splice_write+0x558/0xc30 fs/splice.c:750
 do_splice_from fs/splice.c:852 [inline]
 direct_splice_actor+0x104/0x1c0 fs/splice.c:1019
 splice_direct_to_actor+0x288/0x770 fs/splice.c:974
 do_splice_direct+0x14c/0x270 fs/splice.c:1062
 do_sendfile+0x477/0xd20 fs/read_write.c:1440
 __do_compat_sys_sendfile fs/read_write.c:1522 [inline]
 __se_compat_sys_sendfile fs/read_write.c:1505 [inline]
 __ia32_compat_sys_sendfile+0x197/0x1e0 fs/read_write.c:1505
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x235/0xa5a arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f14cb9
Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 0c 24 c3 8b 1c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 
RSP: 002b:00000000f7eef0cc EFLAGS: 00000296 ORIG_RAX: 00000000000000bb
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000000004
RDX: 0000000000000000 RSI: 0000000024000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..