================================================
WARNING: lock held when returning to user space!
6.18.0-rc7-next-20251127 #1 Not tainted
------------------------------------------------
syz-executor.5/11843 is leaving the kernel with locks still held!
1 lock held by syz-executor.5/11843:
 #0: ffff8880162e9c88 (&sb->s_type->i_mutex_key#30/1){+.+.}-{4:4}, at: start_creating_noperm+0x84/0xd0
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 1 UID: 0 PID: 11856 Comm: syz-executor.6 Not tainted 6.18.0-rc7-next-20251127 #1 PREEMPT(voluntary) 
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:__fput+0x1cc/0xb50
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 f6 08 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 7e 68 49 8d 7f 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 c9 08 00 00 48 ba 00 00 00 00 00 fc ff df 49 8b
RSP: 0018:ffff88806601faa0 EFLAGS: 00010216
RAX: dffffc0000000000 RBX: ffff8880507e9480 RCX: ffffffff81b955d0
RDX: 0000000000000005 RSI: ffffffff81b955e2 RDI: 0000000000000028
RBP: ffff8880094d4fc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000004000000 R11: 0000000000000000 R12: ffff8880094d5000
R13: 0000000000000008 R14: ffff888009106d38 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880e547a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d128000 CR3: 0000000017125000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 task_work_run+0x172/0x280
 do_exit+0x856/0x2950
 do_group_exit+0xd3/0x2a0
 get_signal+0x24aa/0x25d0
 arch_do_signal_or_restart+0x80/0x7a0
 exit_to_user_mode_loop+0x92/0x4d0
 do_syscall_64+0x3c3/0x420
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7e48390b19
Code: Unable to access opcode bytes at 0x7f7e48390aef.
RSP: 002b:00007f7e45906218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f7e484a3f68 RCX: 00007f7e48390b19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7e484a3f68
RBP: 00007f7e484a3f60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7e484a3f6c
R13: 00007ffffb963a1f R14: 00007f7e45906300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__fput+0x1cc/0xb50
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 f6 08 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 7e 68 49 8d 7f 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 c9 08 00 00 48 ba 00 00 00 00 00 fc ff df 49 8b
RSP: 0018:ffff88806601faa0 EFLAGS: 00010216
RAX: dffffc0000000000 RBX: ffff8880507e9480 RCX: ffffffff81b955d0
RDX: 0000000000000005 RSI: ffffffff81b955e2 RDI: 0000000000000028
RBP: ffff8880094d4fc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000004000000 R11: 0000000000000000 R12: ffff8880094d5000
R13: 0000000000000008 R14: ffff888009106d38 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880e547a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d128000 CR3: 0000000017125000 CR4: 0000000000350ef0
Fixing recursive fault but reboot is needed!
BUG: scheduling while atomic: syz-executor.6/11856/0x00000000
INFO: lockdep is turned off.
Modules linked in:
CPU: 1 UID: 0 PID: 11856 Comm: syz-executor.6 Tainted: G      D             6.18.0-rc7-next-20251127 #1 PREEMPT(voluntary) 
Tainted: [D]=DIE
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xfa/0x120
 __schedule_bug+0xb9/0x100
 __schedule+0x249f/0x46a0
 do_task_dead+0xdc/0x110
 make_task_dead+0x373/0x3b0
 rewind_stack_and_make_dead+0x16/0x20
RIP: 0033:0x7f7e48390b19
Code: Unable to access opcode bytes at 0x7f7e48390aef.
RSP: 002b:00007f7e45906218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f7e484a3f68 RCX: 00007f7e48390b19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7e484a3f68
RBP: 00007f7e484a3f60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7e484a3f6c
R13: 00007ffffb963a1f R14: 00007f7e45906300 R15: 0000000000022000
 </TASK>
FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop3): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
FAT-fs (loop6): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
----------------
Code disassembly (best guess):
   0:	48 89 fa             	mov    %rdi,%rdx
   3:	48 c1 ea 03          	shr    $0x3,%rdx
   7:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   b:	0f 85 f6 08 00 00    	jne    0x907
  11:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  18:	fc ff df
  1b:	4d 8b 7e 68          	mov    0x68(%r14),%r15
  1f:	49 8d 7f 28          	lea    0x28(%r15),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 c9 08 00 00    	jne    0x8fd
  34:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  3b:	fc ff df
  3e:	49                   	rex.WB
  3f:	8b                   	.byte 0x8b