------------[ cut here ]------------ WARNING: mm/page-writeback.c:2710 at __folio_mark_dirty+0x202/0xe10 mm/page-writeback.c:2710, CPU#0: syz.0.0/5340 Modules linked in: CPU: 0 UID: 0 PID: 5340 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+0x202/0xe10 mm/page-writeback.c:2710 Code: 3c 20 00 74 08 48 89 df e8 fb ce 2a 00 4c 8b 33 4c 89 f6 48 83 e6 08 31 ff e8 2a 29 c3 ff 49 83 e6 08 75 20 e8 3f 24 c3 ff 90 <0f> 0b 90 eb 1a e8 34 24 c3 ff 48 8b 2c 24 e9 5d 07 00 00 e8 26 24 RSP: 0018:ffffc90002247810 EFLAGS: 00010093 RAX: ffffffff81fde321 RBX: ffffea000043d500 RCX: ffff88801c718000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88801270a198 R08: ffffea000043d507 R09: 1ffffd4000087aa0 R10: dffffc0000000000 R11: fffff94000087aa1 R12: dffffc0000000000 R13: ffff88801270a1a0 R14: 0000000000000000 R15: 0000000000000001 FS: 0000555591a93500(0000) GS:ffff88808d416000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000080 CR3: 000000001fbf5000 CR4: 0000000000352ef0 Call Trace: block_dirty_folio+0x17a/0x1d0 fs/buffer.c:754 ext4_block_page_mkwrite fs/ext4/inode.c:6634 [inline] ext4_page_mkwrite+0xf07/0x1190 fs/ext4/inode.c:6731 do_page_mkwrite+0x14d/0x310 mm/memory.c:3528 wp_page_shared mm/memory.c:3929 [inline] do_wp_page+0x2676/0x5810 mm/memory.c:4148 handle_pte_fault mm/memory.c:6289 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0x14c5/0x32b0 mm/memory.c:6580 do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x71/0xd0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7f9ca1d58b88 Code: 66 89 74 17 02 88 0f c3 c5 fa 6f 06 c5 fa 6f 4c 16 f0 c5 fa 7f 07 c5 fa 7f 4c 17 f0 c3 0f 1f 44 00 00 48 8b 4c 16 f8 48 8b 36 <48> 89 37 48 89 4c 17 f8 c3 62 e1 fe 28 6f 54 16 ff 62 e1 fe 28 6f RSP: 002b:00007ffed9c90b58 EFLAGS: 00010202 RAX: 0000200000000080 RBX: 0000000000000004 RCX: 00746174732e7570 RDX: 0000000000000009 RSI: 746174732e757063 RDI: 0000200000000080 RBP: 0000000000000000 R08: 00007f9ca1bff030 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000009 R12: 00007f9ca1fe5fac R13: 00007f9ca1fe5fa0 R14: fffffffffffffffe R15: 0000000000000004