------------[ cut here ]------------
kernel BUG at fs/buffer.c:555!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 542 Comm: syz.1.34 Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:mark_buffer_dirty_inode+0x2ff/0x310 fs/buffer.c:555
Code: 74 08 4c 89 f7 e8 11 53 ec ff 4d 89 2e 48 8b 7d a8 e8 15 d2 89 02 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 21 58 be ff <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 48 89 e5 41
RSP: 0018:ffff8881e4257458 EFLAGS: 00010293
RAX: ffffffff81a126bf RBX: 0000000000000000 RCX: ffff8881e4260000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881e4260000
RBP: ffff8881e42574b0 R08: dffffc0000000000 R09: fffff94000e4b3d9
R10: fffff94000e4b3d9 R11: 1ffffd4000e4b3d8 R12: dffffc0000000000
R13: ffff8881dd3a0d08 R14: 1ffff1103ba741b5 R15: ffff8881dd3a0da8
FS:  00007f9ec5e036c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f39bb44003e CR3: 00000001e8c87000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 fat_add_entries+0xc25/0x2660 fs/fat/dir.c:1362
 msdos_add_entry+0x1d4/0x320 fs/fat/namei_msdos.c:250
 msdos_create+0x343/0x4c0 fs/fat/namei_msdos.c:289
 lookup_open fs/namei.c:3379 [inline]
 do_last fs/namei.c:3471 [inline]
 path_openat+0x1603/0x35c0 fs/namei.c:3683
 do_filp_open+0x1ae/0x3f0 fs/namei.c:3713
 do_sys_open+0x2bb/0x5d0 fs/open.c:1123
 __do_sys_openat fs/open.c:1150 [inline]
 __se_sys_openat fs/open.c:1144 [inline]
 __x64_sys_openat+0xa2/0xb0 fs/open.c:1144
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f9ec77dc969
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9ec5e03038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f9ec7a04160 RCX: 00007f9ec77dc969
RDX: 000000000000275a RSI: 0000200000000000 RDI: ffffffffffffff9c
RBP: 00007f9ec785eab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f9ec7a04160 R15: 00007ffc1ebf2748
Modules linked in:
---[ end trace 6d4e6be967fa1e5f ]---
RIP: 0010:mark_buffer_dirty_inode+0x2ff/0x310 fs/buffer.c:555
Code: 74 08 4c 89 f7 e8 11 53 ec ff 4d 89 2e 48 8b 7d a8 e8 15 d2 89 02 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 21 58 be ff <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 48 89 e5 41
RSP: 0018:ffff8881e4257458 EFLAGS: 00010293
RAX: ffffffff81a126bf RBX: 0000000000000000 RCX: ffff8881e4260000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881e4260000
RBP: ffff8881e42574b0 R08: dffffc0000000000 R09: fffff94000e4b3d9
R10: fffff94000e4b3d9 R11: 1ffffd4000e4b3d8 R12: dffffc0000000000
R13: ffff8881dd3a0d08 R14: 1ffff1103ba741b5 R15: ffff8881dd3a0da8
FS:  00007f9ec5e036c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd9f717fa8 CR3: 00000001e8c87000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400