------------[ 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#1: syz.6.228/7463
Modules linked in:
CPU: 1 UID: 0 PID: 7463 Comm: syz.6.228 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__folio_mark_dirty+0x1fb/0xe30 mm/page-writeback.c:2666
Code: 3c 38 00 74 08 48 89 df e8 62 1e 28 00 4c 8b 33 4c 89 f6 48 83 e6 08 31 ff e8 91 1a c2 ff 49 83 e6 08 75 1c e8 26 15 c2 ff 90 <0f> 0b 90 eb 16 e8 1b 15 c2 ff e9 60 07 00 00 e8 11 15 c2 ff eb 05
RSP: 0018:ffffc9000664fa18 EFLAGS: 00010293
RAX: ffffffff82023dea RBX: ffffea00018a1540 RCX: ffff88802e7a1e40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff940003142a9 R12: ffff888060c99d50
R13: ffff888060c99d48 R14: 0000000000000000 R15: dffffc0000000000
FS:  000055556c2cb500(0000) GS:ffff888126442000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7d9b9eab60 CR3: 00000000298aa000 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:6332 [inline]
 __handle_mm_fault mm/memory.c:6454 [inline]
 handle_mm_fault+0x9f5/0x13c0 mm/memory.c:6623
 do_user_addr_fault+0xa73/0x1340 arch/x86/mm/fault.c:1334
 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: 0033:0x7f2c5fc5b658
Code: fc 89 37 c3 c5 fa 6f 06 c5 fa 6f 4c 16 f0 c5 fa 7f 07 c5 fa 7f 4c 17 f0 c3 66 0f 1f 84 00 00 00 00 00 48 8b 4c 16 f8 48 8b 36 <48> 89 37 48 89 4c 17 f8 c3 c5 fe 6f 54 16 e0 c5 fe 6f 5c 16 c0 c5
RSP: 002b:00007ffcb8dece28 EFLAGS: 00010246
RAX: 0000200000000040 RBX: 0000000000000004 RCX: 0031656c69662f2e
RDX: 0000000000000008 RSI: 0031656c69662f2e RDI: 0000200000000040
RBP: fffffffffffffffe R08: 0000001b2d920000 R09: 0000000000000001
R10: 7ffffffffffffff7 R11: 0000000000000009 R12: 00007ffcb8decf50
R13: 00007f2c5ff0618c R14: 000000000002d748 R15: 00007f2c5ff06180
 </TASK>