------------[ cut here ]------------
WARNING: CPU: 0 PID: 5313 at fs/buffer.c:1186 mark_buffer_dirty+0x2a9/0x410 fs/buffer.c:1186
Modules linked in:
CPU: 0 UID: 0 PID: 5313 Comm: syz.0.0 Not tainted 6.15.0-rc4-syzkaller-00291-g2a239ffbebb5 #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:1186
Code: 4c 89 f7 e8 79 0d de ff 49 8b 3e be 20 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 c4 34 fc ff e8 8f 18 7c ff eb 8c e8 88 18 7c ff 90 <0f> 0b 90 e9 95 fd ff ff e8 7a 18 7c ff 90 0f 0b 90 e9 bf fd ff ff
RSP: 0018:ffffc9000d6c6b08 EFLAGS: 00010293
RAX: ffffffff8243a7c8 RBX: ffff888044837658 RCX: ffff88801f53a440
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffff888043040001 R08: ffff88804483765f R09: 1ffff11008906ecb
R10: dffffc0000000000 R11: ffffed1008906ecc R12: ffff88804c668800
R13: ffff8880448371d0 R14: ffff888044837658 R15: 000000000000000a
FS:  00007f27e095b6c0(0000) GS:ffff88808d6cb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f27e0959a00 CR3: 0000000042214000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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+0x6b2/0x1900 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+0x2c4/0x910 mm/filemap.c:4103
 generic_file_write_iter+0x10f/0x540 mm/filemap.c:4246
 __kernel_write_iter+0x390/0x860 fs/read_write.c:617
 __kernel_write+0xef/0x150 fs/read_write.c:637
 __dump_emit+0x206/0x310 fs/coredump.c:808
 elf_core_dump+0x2ca2/0x3900 fs/binfmt_elf.c:2107
 do_coredump+0x1ec8/0x2a30 fs/coredump.c:759
 get_signal+0x10d9/0x1310 kernel/signal.c:3019
 arch_do_signal_or_restart+0x95/0x780 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:329 [inline]
 irqentry_exit_to_user_mode+0x81/0x120 kernel/entry/common.c:231
 exc_general_protection+0x171/0x200 arch/x86/kernel/traps.c:791
 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:617
RIP: 0033:0x7f27dfb8e971
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:0000200000000890 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f27dfdb6080 RCX: 00007f27dfb8e969
RDX: 00002000000003c0 RSI: 0000200000000890 RDI: 0000000000001000
RBP: 00007f27dfc10ab1 R08: 0000200000001580 R09: 0000200000001580
R10: 00002000000008c0 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f27dfdb6080 R15: 00007ffe1843f568
 </TASK>