------------[ cut here ]------------
WARNING: fs/buffer.c:1183 at mark_buffer_dirty+0x299/0x400 fs/buffer.c:1183, CPU#0: syz.1.26/6064
Modules linked in:
CPU: 0 UID: 0 PID: 6064 Comm: syz.1.26 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:mark_buffer_dirty+0x299/0x400 fs/buffer.c:1183
Code: 4c 89 f7 e8 49 c3 db ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 24 a2 fb ff e8 1f 6b 75 ff eb 8c e8 18 6b 75 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 0a 6b 75 ff 90 0f 0b 90 e9 cf fd ff ff
RSP: 0018:ffffc90004cbe388 EFLAGS: 00010293
RAX: ffffffff824c4878 RBX: ffff888032065000 RCX: ffff88802abc3d00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffff888022346001 R08: ffff888032065007 R09: 1ffff1100640ca00
R10: dffffc0000000000 R11: ffffed100640ca01 R12: ffff88801a7bc000
R13: ffff8880320612b8 R14: ffff888032065000 R15: 0000000000000010
FS:  00007fe4126bb6c0(0000) GS:ffff888125e37000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 000000002e5da000 CR4: 00000000003526f0
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:2145
 block_write_begin+0x8d/0x120 fs/buffer.c:2256
 bfs_write_begin+0x35/0xd0 fs/bfs/file.c:180
 generic_perform_write+0x2c5/0x900 mm/filemap.c:4314
 generic_file_write_iter+0x117/0x550 mm/filemap.c:4457
 __kernel_write_iter+0x428/0x910 fs/read_write.c:619
 __kernel_write+0xef/0x150 fs/read_write.c:639
 __dump_emit+0x206/0x310 fs/coredump.c:1220
 writenote+0x1be/0x2e0 fs/binfmt_elf.c:1434
 write_note_info fs/binfmt_elf.c:1936 [inline]
 elf_core_dump+0x2e3b/0x3960 fs/binfmt_elf.c:2098
 coredump_write+0x1121/0x18b0 fs/coredump.c:1049
 do_coredump fs/coredump.c:1126 [inline]
 vfs_coredump+0x3321/0x3e60 fs/coredump.c:1200
 get_signal+0x1108/0x1340 kernel/signal.c:3019
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:75 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
 irqentry_exit+0x177/0x660 kernel/entry/common.c:196
 exc_page_fault+0xab/0x100 arch/x86/mm/fault.c:1535
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7fe41178f751
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:0000000000000010 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fe4119e5fa0 RCX: 00007fe41178f749
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 000000008d00a080
RBP: 00007fe411813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007fe4119e6038 R14: 00007fe4119e5fa0 R15: 00007ffe72b8b538
 </TASK>