------------[ cut here ]------------ !buffer_uptodate(bh) WARNING: fs/buffer.c:1093 at mark_buffer_dirty+0x299/0x410 fs/buffer.c:1093, CPU#0: syz.0.0/5329 Modules linked in: CPU: 0 UID: 0 PID: 5329 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:mark_buffer_dirty+0x299/0x410 fs/buffer.c:1093 Code: 4c 89 f7 e8 39 10 d9 ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 d4 5e fb ff e8 cf eb 69 ff eb 8c e8 c8 eb 69 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 ba eb 69 ff 90 0f 0b 90 e9 cf fd ff ff RSP: 0018:ffffc9000fbb6688 EFLAGS: 00010293 RAX: ffffffff825c96c8 RBX: ffff888044158d20 RCX: ffff888012982540 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002 RBP: 0000000000000201 R08: ffff888044158d27 R09: 1ffff1100882b1a4 R10: dffffc0000000000 R11: ffffed100882b1a5 R12: 0000000000000011 R13: ffff888044158d20 R14: ffff88804413f540 R15: dffffc0000000000 FS: 00007f883252a6c0(0000) GS:ffff88808c54e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000001fb16000 CR4: 0000000000352ef0 Call Trace: bfs_move_block fs/bfs/file.c:44 [inline] bfs_move_blocks fs/bfs/file.c:57 [inline] bfs_get_block+0x5c6/0xb50 fs/bfs/file.c:126 __block_write_begin_int+0x6c2/0x1900 fs/buffer.c:2123 block_write_begin+0x8d/0x120 fs/buffer.c:2234 bfs_write_begin+0x35/0xd0 fs/bfs/file.c:180 generic_perform_write+0x2d5/0x8f0 mm/filemap.c:4358 generic_file_write_iter+0xae/0x330 mm/filemap.c:4501 __kernel_write_iter+0x44a/0x8f0 fs/read_write.c:621 __kernel_write+0x106/0x170 fs/read_write.c:641 __dump_emit fs/coredump.c:1220 [inline] dump_emit+0x920/0xb00 fs/coredump.c:1258 elf_core_dump+0x2ff4/0x3a90 fs/binfmt_elf.c:2088 coredump_write+0x1290/0x1960 fs/coredump.c:1052 do_coredump fs/coredump.c:1131 [inline] vfs_coredump+0x36ff/0x44b0 fs/coredump.c:1200 get_signal+0x1094/0x12c0 kernel/signal.c:3023 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop kernel/entry/common.c:101 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline] irqentry_exit+0x2ba/0x8f0 kernel/entry/common.c:165 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0033:0x7f883159de61 Code: 00 00 00 00 0f 1f 44 00 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 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:00000000fffffeb0 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f8831826090 RCX: 00007f883159de59 RDX: 0000000000000000 RSI: 00000000fffffeb0 RDI: 0000000002000400 RBP: 00007f8831633e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007f8831826128 R14: 00007f8831826090 R15: 00007fff57edebe8