------------[ cut here ]------------
WARNING: CPU: 0 PID: 5328 at mm/page-writeback.c:2716 __folio_mark_dirty+0x202/0xe30 mm/page-writeback.c:2716
Modules linked in:
CPU: 0 UID: 0 PID: 5328 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~bpo12+1 04/01/2014
RIP: 0010:__folio_mark_dirty+0x202/0xe30 mm/page-writeback.c:2716
Code: 3c 20 00 74 08 48 89 df e8 7b be 2a 00 4c 8b 33 4c 89 f6 48 83 e6 08 31 ff e8 6a 84 c3 ff 49 83 e6 08 75 20 e8 7f 7f c3 ff 90 <0f> 0b 90 eb 1a e8 74 7f c3 ff 48 8b 2c 24 e9 74 07 00 00 e8 66 7f
RSP: 0018:ffffc9000d3275b0 EFLAGS: 00010087
RAX: ffffffff81fc9491 RBX: ffffea00010dd200 RCX: 0000000000100000
RDX: ffffc9000eac3000 RSI: 00000000000002f8 RDI: 00000000000002f9
RBP: ffff8880427897d8 R08: ffffea00010dd207 R09: 1ffffd400021ba40
R10: dffffc0000000000 R11: fffff9400021ba41 R12: dffffc0000000000
R13: ffff8880427897e0 R14: 0000000000000000 R15: 0000000000000001
FS:  00007f662e54e6c0(0000) GS:ffff88808d733000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000080 CR3: 00000000120a2000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 block_dirty_folio+0x17a/0x1d0 fs/buffer.c:754
 ext4_block_page_mkwrite fs/ext4/inode.c:6649 [inline]
 ext4_page_mkwrite+0xf07/0x1190 fs/ext4/inode.c:6746
 do_page_mkwrite+0x14d/0x310 mm/memory.c:3488
 wp_page_shared mm/memory.c:3889 [inline]
 do_wp_page+0x268d/0x5800 mm/memory.c:4108
 handle_pte_fault mm/memory.c:6193 [inline]
 __handle_mm_fault+0x1033/0x5400 mm/memory.c:6318
 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6487
 do_user_addr_fault+0x764/0x1380 arch/x86/mm/fault.c:1387
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:rep_movs_alternative+0x33/0x90 arch/x86/lib/copy_user_64.S:61
Code: 73 25 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 e9 cd 31 04 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb
RSP: 0018:ffffc9000d327dc8 EFLAGS: 00050246
RAX: 0000000c0000000b RBX: 0000000000000008 RCX: 0000000000000008
RDX: 0000000000000000 RSI: ffffc9000d327e20 RDI: 0000200000000080
RBP: ffffc9000d327ec0 R08: ffffc9000d327e27 R09: 1ffff92001a64fc4
R10: dffffc0000000000 R11: fffff52001a64fc5 R12: 0000200000000088
R13: 00007ffffffff000 R14: ffffc9000d327e20 R15: 0000200000000080
 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline]
 _inline_copy_to_user include/linux/uaccess.h:197 [inline]
 _copy_to_user+0x8a/0xb0 lib/usercopy.c:26
 copy_to_user include/linux/uaccess.h:225 [inline]
 do_pipe2+0xc2/0x170 fs/pipe.c:1040
 __do_sys_pipe fs/pipe.c:1061 [inline]
 __se_sys_pipe fs/pipe.c:1059 [inline]
 __x64_sys_pipe+0x3a/0x50 fs/pipe.c:1059
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f662d78efc9
Code: ff ff c3 66 2e 0f 1f 84 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
RSP: 002b:00007f662e54e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000016
RAX: ffffffffffffffda RBX: 00007f662d9e6090 RCX: 00007f662d78efc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000080
RBP: 00007f662d811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f662d9e6128 R14: 00007f662d9e6090 R15: 00007ffd8c41bee8
 </TASK>
----------------
Code disassembly (best guess):
   0:	73 25                	jae    0x27
   2:	85 c9                	test   %ecx,%ecx
   4:	74 0f                	je     0x15
   6:	8a 06                	mov    (%rsi),%al
   8:	88 07                	mov    %al,(%rdi)
   a:	48 ff c7             	inc    %rdi
   d:	48 ff c6             	inc    %rsi
  10:	48 ff c9             	dec    %rcx
  13:	75 f1                	jne    0x6
  15:	e9 cd 31 04 00       	jmp    0x431e7
  1a:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  21:	00 00 00
  24:	0f 1f 00             	nopl   (%rax)
  27:	48 8b 06             	mov    (%rsi),%rax
* 2a:	48 89 07             	mov    %rax,(%rdi) <-- trapping instruction
  2d:	48 83 c6 08          	add    $0x8,%rsi
  31:	48 83 c7 08          	add    $0x8,%rdi
  35:	83 e9 08             	sub    $0x8,%ecx
  38:	74 db                	je     0x15
  3a:	83 f9 08             	cmp    $0x8,%ecx
  3d:	73 e8                	jae    0x27
  3f:	eb                   	.byte 0xeb