------------[ cut here ]------------
WARNING: CPU: 0 PID: 5342 at fs/buffer.c:1189 mark_buffer_dirty+0x2a9/0x410 fs/buffer.c:1189
Modules linked in:
CPU: 0 UID: 0 PID: 5342 Comm: syz.0.0 Not tainted 6.16.0-rc7-syzkaller-00140-gec2df4364666 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:mark_buffer_dirty+0x2a9/0x410 fs/buffer.c:1189
Code: 4c 89 f7 e8 b9 b1 dd ff 49 8b 3e be 20 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 84 33 fc ff e8 ff 30 7a ff eb 8c e8 f8 30 7a ff 90 <0f> 0b 90 e9 95 fd ff ff e8 ea 30 7a ff 90 0f 0b 90 e9 bf fd ff ff
RSP: 0000:ffffc9000d436a28 EFLAGS: 00010293
RAX: ffffffff82460018 RBX: ffff888044c6a2b8 RCX: ffff888032e3c880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffff8880116cc001 R08: ffff888044c6a2bf R09: 1ffff1100898d457
R10: dffffc0000000000 R11: ffffed100898d458 R12: ffff88804d6d9600
R13: ffff888044c67740 R14: ffff888044c6a2b8 R15: 0000000000000012
FS:  00007fc4ee62a6c0(0000) GS:ffff88808d218000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 00000000534d0000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 bfs_move_block fs/bfs/file.c:44 [inline]
 bfs_move_blocks fs/bfs/file.c:57 [inline]
 bfs_get_block+0x5da/0xae0 fs/bfs/file.c:126
 __block_write_begin_int+0x6b5/0x1900 fs/buffer.c:2151
 block_write_begin+0x8a/0x120 fs/buffer.c:2262
 bfs_write_begin+0x35/0xd0 fs/bfs/file.c:179
 generic_perform_write+0x2c7/0x910 mm/filemap.c:4112
 generic_file_write_iter+0x10f/0x540 mm/filemap.c:4255
 __kernel_write_iter+0x390/0x860 fs/read_write.c:619
 __kernel_write+0xef/0x150 fs/read_write.c:639
 __dump_emit+0x206/0x310 fs/coredump.c:1034
 elf_core_dump+0x2ca2/0x3900 fs/binfmt_elf.c:2054
 do_coredump+0x2809/0x3440 fs/coredump.c:950
 get_signal+0x1109/0x1340 kernel/signal.c:3019
 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 irqentry_exit_to_user_mode+0x81/0x120 kernel/entry/common.c:184
 exc_page_fault+0x9f/0xf0 arch/x86/mm/fault.c:1535
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7fc4ed78e9b1
Code: 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 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:00000000ffffff10 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fc4ed9b5fa0 RCX: 00007fc4ed78e9a9
RDX: 0000000000000000 RSI: 00000000ffffff10 RDI: 0000000000008000
RBP: 00007fc4ed810d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc4ed9b5fa0 R15: 00007fff1c50c8f8
 </TASK>