------------[ cut here ]------------
!folio_buffers(folio)
WARNING: fs/ext4/inode.c:3939 at ext4_dirty_folio+0x17e/0x1e0 fs/ext4/inode.c:3939, CPU#0: syz.0.2109/12102
Modules linked in:
CPU: 0 UID: 0 PID: 12102 Comm: syz.0.2109 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:ext4_dirty_folio+0x17e/0x1e0 fs/ext4/inode.c:3939
Code: 18 b0 35 ff 90 0f 0b 90 e9 2e ff ff ff e8 0a b0 35 ff 48 c7 c6 c0 a7 ed 8b 48 89 df e8 fb 5d 86 ff 90 0f 0b e8 f3 af 35 ff 90 <0f> 0b 90 e9 38 ff ff ff e8 e5 af 35 ff 48 c7 c6 c0 a7 ed 8b 48 89
RSP: 0018:ffffc9000571fa00 EFLAGS: 00010283
RAX: 000000000000c2f1 RBX: ffffea00022f48c0 RCX: ffffc90006d59000
RDX: 0000000000080000 RSI: ffffffff82d40b8d RDI: ffffea00022f48e8
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888036e06b78
R13: ffffea00022f48c8 R14: ffffea00022f48c0 R15: ffff88807c950000
FS:  00007f3152ef16c0(0000) GS:ffff888123de6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000034afa4 CR3: 00000000372e8000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 folio_mark_dirty+0x10a/0x200 mm/page-writeback.c:2796
 unpin_user_pages_dirty_lock+0x28e/0x350 mm/gup.c:321
 process_vm_rw_single_vec mm/process_vm_access.c:127 [inline]
 process_vm_rw_core.constprop.0+0x805/0x950 mm/process_vm_access.c:216
 process_vm_rw+0x309/0x370 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+0xe2/0x1c0 mm/process_vm_access.c:299
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3151f9de99
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:00007f3152ef1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000137
RAX: ffffffffffffffda RBX: 00007f3152225fa0 RCX: 00007f3151f9de99
RDX: 00000000000001d0 RSI: 0000200000c22000 RDI: 0000000000000355
RBP: 00007f3152033eaf R08: 0000000000000001 R09: 0000000000000000
R10: 0000200000c22fa0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3152226038 R14: 00007f3152225fa0 R15: 00007ffd8ffcfe98
 </TASK>