------------[ cut here ]------------
WARNING: CPU: 0 PID: 5350 at fs/buffer.c:1177 mark_buffer_dirty+0x2e5/0x520 fs/buffer.c:1177
Modules linked in:
CPU: 0 UID: 0 PID: 5350 Comm: syz-executor725 Not tainted 6.12.0-rc4-syzkaller-00256-gc71f8fb4dc91 #0
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+0x2e5/0x520 fs/buffer.c:1177
Code: 89 df e8 8e 83 db ff 48 8b 3b be 20 00 00 00 5b 41 5e 41 5f 5d e9 fb e8 fb ff e8 a6 c5 71 ff e9 73 ff ff ff e8 9c c5 71 ff 90 <0f> 0b 90 e9 61 fd ff ff e8 8e c5 71 ff 90 0f 0b 90 e9 88 fd ff ff
RSP: 0018:ffffc9000d15eb48 EFLAGS: 00010293
RAX: ffffffff822324d4 RBX: ffff888047989101 RCX: ffff88801f5ec880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff82232231 R09: 1ffff11008f368cb
R10: dffffc0000000000 R11: ffffed1008f368cc R12: dffffc0000000000
R13: ffff8880479b4658 R14: ffff8880479b4658 R15: ffff8880505de600
FS:  00007f403bdec6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020003000 CR3: 0000000044544000 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+0xadd/0xb70 fs/bfs/file.c:126
 __block_write_begin_int+0x50c/0x1a70 fs/buffer.c:2121
 block_write_begin+0x8f/0x120 fs/buffer.c:2231
 bfs_write_begin+0x35/0xd0 fs/bfs/file.c:179
 generic_perform_write+0x344/0x6d0 mm/filemap.c:4054
 generic_file_write_iter+0xae/0x310 mm/filemap.c:4181
 __kernel_write_iter+0x42a/0x940 fs/read_write.c:616
 __kernel_write+0x120/0x180 fs/read_write.c:636
 __dump_emit+0x237/0x360 fs/coredump.c:807
 writenote+0x221/0x3b0 fs/binfmt_elf.c:1463
 write_note_info fs/binfmt_elf.c:1948 [inline]
 elf_core_dump+0x3836/0x4770 fs/binfmt_elf.c:2108
 do_coredump+0x2162/0x2ec0 fs/coredump.c:758
 get_signal+0x13fc/0x1740 kernel/signal.c:2902
 arch_do_signal_or_restart+0x96/0x860 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:328 [inline]
 irqentry_exit_to_user_mode+0x79/0x280 kernel/entry/common.c:231
 exc_page_fault+0x590/0x8c0 arch/x86/mm/fault.c:1542
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f403be412b1
Code: c4 28 c3 e8 31 1e 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:ffffffffffffffe0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f403bec7488 RCX: 00007f403be412a9
RDX: 0000000000000000 RSI: ffffffffffffffe0 RDI: 0000000004008011
RBP: 00007f403bec7480 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f403be8d420
R13: 00007f403be8d055 R14: 0073746e6576652e R15: 652e79726f6d656d
 </TASK>