------------[ cut here ]------------
kernel BUG at fs/buffer.c:3071!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 7893 Comm: syz-executor.0 Not tainted 5.5.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:submit_bh_wbc+0x5e9/0x7b0 fs/buffer.c:3071
Code: 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 be 08 00 00 00 4c 89 e7 e8 85 15 e9 ff f0 41 80 64 24 01 f7 e9 5b fb ff ff 0f 0b <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b e8 18 42 e9 ff e9 ed fd ff ff 48 89
RSP: 0018:ffffc90002af7c30 EFLAGS: 00010246
RAX: 0000000000000005 RBX: 0000000000000800 RCX: ffffffff81b5ad70
RDX: 1ffff11012c2353b RSI: 0000000000000008 RDI: ffff88809611a9d8
RBP: ffffc90002af7c78 R08: ffffed1012c2353c R09: ffffed1012c2353c
R10: ffffed1012c2353b R11: ffff88809611a9df R12: ffff88809611a9d8
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00000000019ef940(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6b31afca20 CR3: 000000009fa38000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 submit_bh fs/buffer.c:3118 [inline]
 __sync_dirty_buffer+0xe7/0x290 fs/buffer.c:3204
 sync_dirty_buffer+0xe/0x10 fs/buffer.c:3217
 fat_set_state+0x1be/0x280 fs/fat/inode.c:708
 fat_put_super+0x40/0xd0 fs/fat/inode.c:734
 generic_shutdown_super+0x12d/0x330 fs/super.c:464
 kill_block_super+0x96/0xe0 fs/super.c:1444
 deactivate_locked_super+0x77/0xd0 fs/super.c:335
 deactivate_super+0x136/0x150 fs/super.c:366
 cleanup_mnt+0x204/0x440 fs/namespace.c:1102
 __cleanup_mnt+0xd/0x10 fs/namespace.c:1109
 task_work_run+0x108/0x180 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x24e/0x2e0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x4ff/0x5f0 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45d347
Code: 64 89 04 25 d0 02 00 00 58 5f ff d0 48 89 c7 e8 2f be ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 4d 8c fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff29ee0f88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000045d347
RDX: 0000000000403720 RSI: 0000000000000002 RDI: 00007fff29ee1030
RBP: 000000000000056a R08: 0000000000000000 R09: 000000000000000b
R10: 0000000000000005 R11: 0000000000000206 R12: 00007fff29ee20c0
R13: 00000000019f0940 R14: 0000000000000000 R15: 00007fff29ee20c0
Modules linked in:
---[ end trace 9b3e6850c07d0823 ]---
RIP: 0010:submit_bh_wbc+0x5e9/0x7b0 fs/buffer.c:3071
Code: 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 be 08 00 00 00 4c 89 e7 e8 85 15 e9 ff f0 41 80 64 24 01 f7 e9 5b fb ff ff 0f 0b <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b e8 18 42 e9 ff e9 ed fd ff ff 48 89
RSP: 0018:ffffc90002af7c30 EFLAGS: 00010246
RAX: 0000000000000005 RBX: 0000000000000800 RCX: ffffffff81b5ad70
RDX: 1ffff11012c2353b RSI: 0000000000000008 RDI: ffff88809611a9d8
RBP: ffffc90002af7c78 R08: ffffed1012c2353c R09: ffffed1012c2353c
R10: ffffed1012c2353b R11: ffff88809611a9df R12: ffff88809611a9d8
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00000000019ef940(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000075c000 CR3: 000000009fa38000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400