loop0: detected capacity change from 0 to 2048
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
------------[ cut here ]------------
!folio_buffers(folio)
WARNING: fs/ext4/inode.c:3937 at ext4_dirty_folio+0x167/0x1b0 fs/ext4/inode.c:3937, CPU#0: syz.0.0/5321
Modules linked in:
CPU: 0 UID: 0 PID: 5321 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 04/01/2014
RIP: 0010:ext4_dirty_folio+0x167/0x1b0 fs/ext4/inode.c:3937
Code: ff 32 a5 ff 49 83 3f 00 74 1a e8 b4 8c 33 ff 4c 89 e7 48 89 de 5b 41 5c 41 5d 41 5e 41 5f 5d e9 ef 33 cd ff e8 9a 8c 33 ff 90 <0f> 0b 90 eb e0 e8 8f 8c 33 ff 90 0f 0b 90 eb a7 e8 84 8c 33 ff 48
RSP: 0018:ffffc9000e0a7ac8 EFLAGS: 00010283
RAX: ffffffff829456f6 RBX: ffffea0001358d80 RCX: 0000000000100000
RDX: ffffc9000eb2a000 RSI: 00000000000057ac RDI: 00000000000057ad
RBP: 1ffffd400026b1b0 R08: ffffea0001358d87 R09: 1ffffd400026b1b0
R10: dffffc0000000000 R11: fffff9400026b1b1 R12: ffff888043dd5ef8
R13: 1ffffd400026b1b1 R14: 0000000000000001 R15: ffffea0001358da8
FS:  00007fba9f4f76c0(0000) GS:ffff88808c2c2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001bc0 CR3: 000000001fcd3000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 unpin_user_pages_dirty_lock+0x267/0x310 mm/gup.c:321
 process_vm_rw_single_vec mm/process_vm_access.c:127 [inline]
 process_vm_rw_core mm/process_vm_access.c:216 [inline]
 process_vm_rw+0x8fa/0xba0 mm/process_vm_access.c:284
 __do_sys_process_vm_writev mm/process_vm_access.c:304 [inline]
 __se_sys_process_vm_writev mm/process_vm_access.c:299 [inline]
 __x64_sys_process_vm_writev+0xe0/0x100 mm/process_vm_access.c:299
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fba9e59e159
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:00007fba9f4f6fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000137
RAX: ffffffffffffffda RBX: 00007fba9e825fa0 RCX: 00007fba9e59e159
RDX: 0000000000000001 RSI: 0000200000001c80 RDI: 0000000000000006
RBP: 00007fba9e63506b R08: 0000000000000001 R09: 0000000000000000
R10: 0000200000001d80 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fba9e826038 R14: 00007fba9e825fa0 R15: 00007ffe6eb5dde8
 </TASK>