------------[ cut here ]------------
!folio_buffers(folio)
WARNING: fs/ext4/inode.c:4450 at ext4_dirty_folio+0x167/0x1b0, CPU#0: syz.9.2536/21739
Modules linked in:
CPU: 0 UID: 0 PID: 21739 Comm: syz.9.2536 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:ext4_dirty_folio+0x167/0x1b0
Code: bf a0 a7 ff 49 83 3f 00 74 1a e8 84 65 3c ff 4c 89 e7 48 89 de 5b 41 5c 41 5d 41 5e 41 5f 5d e9 0f 44 cd ff e8 6a 65 3c ff 90 <0f> 0b 90 eb e0 e8 5f 65 3c ff 90 0f 0b 90 eb a7 e8 54 65 3c ff 48
RSP: 0000:ffffc90004277940 EFLAGS: 00010287
RAX: ffffffff82896b86 RBX: ffffea00008c18c0 RCX: 0000000000080000
RDX: ffffc90020622000 RSI: 00000000000000cb RDI: 00000000000000cc
RBP: 1ffffd4000118318 R08: ffffea00008c18c7 R09: 1ffffd4000118318
R10: dffffc0000000000 R11: fffff94000118319 R12: ffff888116b98450
R13: 1ffffd4000118319 R14: 0000000000000001 R15: ffffea00008c18e8
FS:  00007f25ec7d56c0(0000) GS:ffff88818dc0f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0d763064b8 CR3: 000000011a1ea000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 folio_mark_dirty_lock+0xa8/0xe0
 set_page_dirty_lock+0x44/0x50
 fuse_copy_finish+0x10d/0x360
 fuse_dev_do_read+0xd0c/0x1280
 fuse_dev_read+0x16a/0x200
 vfs_read+0x582/0xa70
 ksys_read+0x150/0x270
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f25ee59c819
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:00007f25ec7d5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f25ee816090 RCX: 00007f25ee59c819
RDX: 000000000000202f RSI: 0000200000000040 RDI: 0000000000000005
RBP: 00007f25ee632c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f25ee816128 R14: 00007f25ee816090 R15: 00007ffd788d58c8
 </TASK>
