------------[ cut here ]------------
warn && !folio_test_uptodate(folio)
WARNING: mm/page-writeback.c:2666 at __folio_mark_dirty+0x1fb/0xe30 mm/page-writeback.c:2666, CPU#0: syz.3.77/6416
Modules linked in:
CPU: 0 UID: 0 PID: 6416 Comm: syz.3.77 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:__folio_mark_dirty+0x1fb/0xe30 mm/page-writeback.c:2666
Code: 3c 38 00 74 08 48 89 df e8 12 1b 28 00 4c 8b 33 4c 89 f6 48 83 e6 08 31 ff e8 81 fc c1 ff 49 83 e6 08 75 1c e8 16 f7 c1 ff 90 <0f> 0b 90 eb 16 e8 0b f7 c1 ff e9 60 07 00 00 e8 01 f7 c1 ff eb 05
RSP: 0018:ffffc9000625f0d8 EFLAGS: 00010287
RAX: ffffffff82028f5a RBX: ffffea00019acbc0 RCX: 0000000000080000
RDX: ffffc9000fb45000 RSI: 0000000000000cba RDI: 0000000000000cbb
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff94000335979 R12: ffff8880407a3510
R13: ffff8880407a3508 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f4e4966e6c0(0000) GS:ffff888126335000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000200 CR3: 000000003f8b8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 block_dirty_folio+0x17a/0x1d0 fs/buffer.c:751
 fault_dirty_shared_page+0x103/0x540 mm/memory.c:3619
 wp_page_shared mm/memory.c:4006 [inline]
 do_wp_page+0x20b5/0x49d0 mm/memory.c:4209
 handle_pte_fault mm/memory.c:6333 [inline]
 __handle_mm_fault mm/memory.c:6455 [inline]
 handle_mm_fault+0x9f5/0x13c0 mm/memory.c:6624
 do_user_addr_fault+0x75b/0x1340 arch/x86/mm/fault.c:1385
 handle_page_fault arch/x86/mm/fault.c:1474 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
 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 c3 cc cc cc cc 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:ffffc9000625f6a8 EFLAGS: 00050216
RAX: 000001fffffff7f8 RBX: 0000000000000020 RCX: 0000000000000020
RDX: 0000000000000000 RSI: ffffc9000625fad0 RDI: 0000200000000200
RBP: ffffc9000625fea8 R08: ffffc9000625faef R09: 1ffff92000c4bf5d
R10: dffffc0000000000 R11: fffff52000c4bf5e R12: 0000200000000220
R13: 00007ffffffff000 R14: ffffc9000625fad0 R15: 0000200000000200
 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:206 [inline]
 _copy_to_user+0x8a/0xb0 lib/usercopy.c:26
 copy_to_user include/linux/uaccess.h:236 [inline]
 ext4_ioctl_get_es_cache fs/ext4/ioctl.c:1060 [inline]
 __ext4_ioctl fs/ext4/ioctl.c:1875 [inline]
 ext4_ioctl+0x2585/0x4b40 fs/ext4/ioctl.c:1922
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4e4b41c819
Code: ff c3 66 2e 0f 1f 84 00 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
RSP: 002b:00007f4e4966e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4e4b695fa0 RCX: 00007f4e4b41c819
RDX: 0000200000000200 RSI: 00000000c020662a RDI: 000000000000000c
RBP: 00007f4e4b4b2c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4e4b696038 R14: 00007f4e4b695fa0 R15: 00007fff53b1b9e8
 </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:	c3                   	ret
  16:	cc                   	int3
  17:	cc                   	int3
  18:	cc                   	int3
  19:	cc                   	int3
  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