------------[ cut here ]------------
kernel BUG at fs/buffer.c:3032!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 22439 Comm: syz-executor.0 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:submit_bh_wbc+0x6b0/0x6d0 fs/buffer.c:3032
Code: ff 44 89 e1 80 e1 07 fe c1 38 c1 0f 8c 43 fc ff ff 4c 89 e7 e8 11 a5 e7 ff e9 36 fc ff ff e8 37 a6 a8 ff 0f 0b e8 30 a6 a8 ff <0f> 0b e8 29 a6 a8 ff 0f 0b e8 22 a6 a8 ff 0f 0b e8 1b a6 a8 ff 0f
RSP: 0018:ffffc9000d45f8a8 EFLAGS: 00010287
RAX: ffffffff81cbd520 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc90001909000 RSI: 00000000000020ea RDI: 00000000000020eb
RBP: 0000000000000800 R08: ffffffff81cbcf13 R09: ffffed100671faaf
R10: ffffed100671faaf R11: 0000000000000000 R12: 0000000000000001
R13: ffff8880338fd570 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007fe1c2401700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004e2330 CR3: 0000000088cf2000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 submit_bh fs/buffer.c:3079 [inline]
 __sync_dirty_buffer+0x19b/0x2d0 fs/buffer.c:3165
 __fat_write_inode+0x6f4/0x890 fs/fat/inode.c:899
 write_inode fs/fs-writeback.c:1312 [inline]
 __writeback_single_inode+0x568/0x630 fs/fs-writeback.c:1511
 writeback_single_inode+0x1b1/0x7d0 fs/fs-writeback.c:1565
 sync_inode fs/fs-writeback.c:2602 [inline]
 sync_inode_metadata+0x6d/0xb0 fs/fs-writeback.c:2622
 __generic_file_fsync+0x13c/0x190 fs/libfs.c:1083
 fat_file_fsync+0x7a/0x190 fs/fat/file.c:190
 generic_write_sync include/linux/fs.h:2882 [inline]
 generic_file_write_iter+0x599/0x650 mm/filemap.c:3464
 do_iter_readv_writev+0x5b7/0x820 include/linux/fs.h:1901
 do_iter_write+0x16a/0x540 fs/read_write.c:999
 vfs_writev fs/read_write.c:1072 [inline]
 do_writev+0x23f/0x4a0 fs/read_write.c:1115
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007fe1c2400c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 000000000050eee0 RCX: 000000000045cb29
RDX: 0000000000000001 RSI: 00000000200001c0 RDI: 0000000000000006
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000d62 R14: 00000000004cb843 R15: 00007fe1c24016d4
Modules linked in:
---[ end trace b4faaf20b1cafd54 ]---
RIP: 0010:submit_bh_wbc+0x6b0/0x6d0 fs/buffer.c:3032
Code: ff 44 89 e1 80 e1 07 fe c1 38 c1 0f 8c 43 fc ff ff 4c 89 e7 e8 11 a5 e7 ff e9 36 fc ff ff e8 37 a6 a8 ff 0f 0b e8 30 a6 a8 ff <0f> 0b e8 29 a6 a8 ff 0f 0b e8 22 a6 a8 ff 0f 0b e8 1b a6 a8 ff 0f
RSP: 0018:ffffc9000d45f8a8 EFLAGS: 00010287
RAX: ffffffff81cbd520 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc90001909000 RSI: 00000000000020ea RDI: 00000000000020eb
RBP: 0000000000000800 R08: ffffffff81cbcf13 R09: ffffed100671faaf
R10: ffffed100671faaf R11: 0000000000000000 R12: 0000000000000001
R13: ffff8880338fd570 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007fe1c2401700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcc0e1e1000 CR3: 0000000088cf2000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400