------------[ cut here ]------------
WARNING: fs/buffer.c:1183 at mark_buffer_dirty+0x299/0x3f0, CPU#0: syz.0.8698/7477
Modules linked in:
CPU: 0 UID: 0 PID: 7477 Comm: syz.0.8698 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:mark_buffer_dirty+0x299/0x3f0
Code: 4c 89 f7 e8 79 48 db ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 04 8a fb ff e8 df ea 73 ff eb 8c e8 d8 ea 73 ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 ca ea 73 ff 90 0f 0b 90 e9 cf fd ff ff
RSP: 0018:ffffc9000b65e3a8 EFLAGS: 00010293
RAX: ffffffff824e91a8 RBX: ffff8881165980e8 RCX: ffff8881140aba80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffff88819d808001 R08: ffff8881165980ef R09: 1ffff11022cb301d
R10: dffffc0000000000 R11: ffffed1022cb301e R12: ffff8881192ff400
R13: ffff8881bf95e828 R14: ffff8881165980e8 R15: 000000000000000f
FS:  00007f10276ac6c0(0000) GS:ffff88818e409000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000fffffc00 CR3: 00000001073b6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 bfs_get_block+0x5da/0xae0
 __block_write_begin_int+0x6c6/0x1910
 block_write_begin+0x8d/0x120
 bfs_write_begin+0x35/0xd0
 generic_perform_write+0x2e2/0x8f0
 generic_file_write_iter+0x14a/0x680
 __kernel_write_iter+0x41e/0x880
 __kernel_write+0x106/0x170
 __dump_emit+0x20b/0x320
 writenote+0x1c0/0x2f0
 elf_core_dump+0x309a/0x3ad0
 coredump_write+0x11de/0x1980
 vfs_coredump+0x369e/0x4270
 get_signal+0x1107/0x1330
 arch_do_signal_or_restart+0xbc/0x830
 irqentry_exit+0x175/0x610
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7f102679acc1
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 <c3> 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: 00007f1026a16090 RCX: 00007f102679acb9
RDX: 0000000000000000 RSI: 00000000fffffeb0 RDI: 0000000002000400
RBP: 00007f1026808bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f1026a16128 R14: 00007f1026a16090 R15: 00007fff638bfcc8
 </TASK>
