------------[ 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.1.656/11068
Modules linked in:
CPU: 0 UID: 0 PID: 11068 Comm: syz.1.656 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 32 1c 28 00 4c 8b 33 4c 89 f6 48 83 e6 08 31 ff e8 c1 03 c2 ff 49 83 e6 08 75 1c e8 56 fe c1 ff 90 <0f> 0b 90 eb 16 e8 4b fe c1 ff e9 60 07 00 00 e8 41 fe c1 ff eb 05
RSP: 0000:ffffc90006777a18 EFLAGS: 00010293
RAX: ffffffff820281ea RBX: ffffea0001aa9400 RCX: ffff888032c25b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff94000355281 R12: ffff8880346f2930
R13: ffff8880346f2928 R14: 0000000000000000 R15: dffffc0000000000
FS:  00005555907cf500(0000) GS:ffff888126338000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000002c0 CR3: 000000002b45a000 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+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: 0033:0x7facf0e35ee2
Code: 30 48 8b 14 24 48 85 d2 74 17 8b 44 24 10 0f c8 89 c0 48 89 44 24 10 48 83 fa 01 0f 85 aa 02 00 00 48 8b 44 24 18 8b 74 24 10 <89> 30 e9 1e fe ff ff 48 8b 44 24 18 8b 10 48 8b 04 24 48 85 c0 0f
RSP: 002b:00007fff06a5e4c0 EFLAGS: 00010246
RAX: 00002000000002c0 RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000002000000 RDI: 00005555907cf3d8
RBP: 00007fff06a5e5e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000002000000 R11: 0000000000000003 R12: 00007fff06a5e620
R13: 00007facf11e5fac R14: 000000000006ae49 R15: 00007facf11e5fa0
 </TASK>