incfs: Can't find or create .incomplete dir in ./file0
incfs: mount failed -22
incfs: ino conflict with backing FS 2
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 377 Comm: syz.2.18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:mnt_want_write+0x2f/0x300 fs/namespace.c:402
Code: 57 41 56 41 55 41 54 53 50 48 89 fb 49 bd 00 00 00 00 00 fc ff df e8 b0 2f aa ff 48 89 5d d0 4c 8d 73 08 4c 89 f3 48 c1 eb 03 <42> 80 3c 2b 00 74 08 4c 89 f7 e8 02 5c ef ff 4d 8b 3e 4d 8d a7 a8
RSP: 0018:ffffc90000967a68 EFLAGS: 00010202
RAX: ffffffff81c71a10 RBX: 0000000000000001 RCX: ffff8881151e3cc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000967a98 R08: 0000000000000003 R09: 0000000000000004
R10: 0000000000000000 R11: fffff5200012cf2a R12: ffff8881150f1400
R13: dffffc0000000000 R14: 0000000000000008 R15: dffffc0000000000
FS:  000055555fe8a500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33863fff CR3: 000000012df29000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ovl_want_write+0x92/0xa0 fs/overlayfs/util.c:22
 ovl_setattr+0x9a/0x540 fs/overlayfs/inode.c:33
 notify_change+0xcc3/0xf80 fs/attr.c:499
 incfs_setattr+0x260/0x3e0 fs/incfs/vfs.c:1688
 notify_change+0xcc3/0xf80 fs/attr.c:499
 chmod_common+0x223/0x3c0 fs/open.c:607
 do_fchmodat+0xd4/0x1a0 fs/open.c:646
 __do_sys_chmod fs/open.c:664 [inline]
 __se_sys_chmod fs/open.c:662 [inline]
 __x64_sys_chmod+0x60/0x70 fs/open.c:662
 x64_sys_call+0x760/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:91
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc5e259acb9
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:00007ffff9f5e8f8 EFLAGS: 00000246 ORIG_RAX: 000000000000005a
RAX: ffffffffffffffda RBX: 00007fc5e2815fa0 RCX: 00007fc5e259acb9
RDX: 0000000000000000 RSI: 0000000000000054 RDI: 0000200000000000
RBP: 00007fc5e2608bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc5e2815fac R14: 00007fc5e2815fa0 R15: 00007fc5e2815fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:mnt_want_write+0x2f/0x300 fs/namespace.c:402
Code: 57 41 56 41 55 41 54 53 50 48 89 fb 49 bd 00 00 00 00 00 fc ff df e8 b0 2f aa ff 48 89 5d d0 4c 8d 73 08 4c 89 f3 48 c1 eb 03 <42> 80 3c 2b 00 74 08 4c 89 f7 e8 02 5c ef ff 4d 8b 3e 4d 8d a7 a8
RSP: 0018:ffffc90000967a68 EFLAGS: 00010202
RAX: ffffffff81c71a10 RBX: 0000000000000001 RCX: ffff8881151e3cc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000967a98 R08: 0000000000000003 R09: 0000000000000004
R10: 0000000000000000 R11: fffff5200012cf2a R12: ffff8881150f1400
R13: dffffc0000000000 R14: 0000000000000008 R15: dffffc0000000000
FS:  000055555fe8a500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c007056000 CR3: 000000012df29000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	57                   	push   %rdi
   1:	41 56                	push   %r14
   3:	41 55                	push   %r13
   5:	41 54                	push   %r12
   7:	53                   	push   %rbx
   8:	50                   	push   %rax
   9:	48 89 fb             	mov    %rdi,%rbx
   c:	49 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%r13
  13:	fc ff df
  16:	e8 b0 2f aa ff       	call   0xffaa2fcb
  1b:	48 89 5d d0          	mov    %rbx,-0x30(%rbp)
  1f:	4c 8d 73 08          	lea    0x8(%rbx),%r14
  23:	4c 89 f3             	mov    %r14,%rbx
  26:	48 c1 eb 03          	shr    $0x3,%rbx
* 2a:	42 80 3c 2b 00       	cmpb   $0x0,(%rbx,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 02 5c ef ff       	call   0xffef5c3b
  39:	4d 8b 3e             	mov    (%r14),%r15
  3c:	4d                   	rex.WRB
  3d:	8d                   	.byte 0x8d
  3e:	a7                   	cmpsl  %es:(%rdi),%ds:(%rsi)
  3f:	a8                   	.byte 0xa8