BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 800000010cb35067 P4D 800000010cb35067 PUD 103b35067 PMD 0 
Oops: Oops: 0000 [#1] PREEMPT SMP PTI
CPU: 0 UID: 0 PID: 3331 Comm: syz.0.15 Not tainted 6.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:strlen+0xb/0x20 lib/string.c:402
Code: d8 5b 41 5e 41 5f c3 cc cc cc cc 90 0f 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 c7 c0 ff ff ff ff <80> 7c 07 01 00 48 8d 40 01 75 f5 c3 cc cc cc cc 0f 1f 44 00 00 90
RSP: 0018:ffffc90002d1fc68 EFLAGS: 00010246
RAX: ffffffffffffffff RBX: ffff888102b40000 RCX: 0000000000000000
RDX: ffffc90002d1fce8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000001000 R09: 0000000000000000
R10: ffff888102b40000 R11: 0000000000000000 R12: 0000000000000003
R13: 0000000000000001 R14: 0000000000000000 R15: ffff8881771a4000
FS:  00007f38b18596c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010bf94000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 getname_kernel+0x13/0x100 fs/namei.c:232
 kern_path+0x12/0x80 fs/namei.c:2716
 is_good_dev_path fs/btrfs/volumes.c:760 [inline]
 btrfs_scan_one_device+0x90/0x450 fs/btrfs/volumes.c:1484
 btrfs_get_tree_super fs/btrfs/super.c:1841 [inline]
 btrfs_get_tree+0xc7/0x770 fs/btrfs/super.c:2114
 vfs_get_tree+0x24/0xb0 fs/super.c:1800
 fc_mount+0xd/0x40 fs/namespace.c:1231
 btrfs_get_tree_subvol fs/btrfs/super.c:2077 [inline]
 btrfs_get_tree+0x22d/0x770 fs/btrfs/super.c:2115
 vfs_get_tree+0x24/0xb0 fs/super.c:1800
 vfs_cmd_create+0x53/0xc0 fs/fsopen.c:225
 __do_sys_fsconfig fs/fsopen.c:472 [inline]
 __se_sys_fsconfig+0x32c/0x4c0 fs/fsopen.c:344
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x8d/0x190 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f38b097dff9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f38b1859038 EFLAGS: 00000246 ORIG_RAX: 00000000000001af
RAX: ffffffffffffffda RBX: 00007f38b0b35f80 RCX: 00007f38b097dff9
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003
RBP: 00007f38b09f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f38b0b35f80 R15: 00007fffa4b3bf28
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:strlen+0xb/0x20 lib/string.c:402
Code: d8 5b 41 5e 41 5f c3 cc cc cc cc 90 0f 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 c7 c0 ff ff ff ff <80> 7c 07 01 00 48 8d 40 01 75 f5 c3 cc cc cc cc 0f 1f 44 00 00 90
RSP: 0018:ffffc90002d1fc68 EFLAGS: 00010246
RAX: ffffffffffffffff RBX: ffff888102b40000 RCX: 0000000000000000
RDX: ffffc90002d1fce8 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000001000 R09: 0000000000000000
R10: ffff888102b40000 R11: 0000000000000000 R12: 0000000000000003
R13: 0000000000000001 R14: 0000000000000000 R15: ffff8881771a4000
FS:  00007f38b18596c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010bf94000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	d8 5b 41             	fcomps 0x41(%rbx)
   3:	5e                   	pop    %rsi
   4:	41 5f                	pop    %r15
   6:	c3                   	ret
   7:	cc                   	int3
   8:	cc                   	int3
   9:	cc                   	int3
   a:	cc                   	int3
   b:	90                   	nop
   c:	0f 0b                	ud2
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	90                   	nop
  1f:	f3 0f 1e fa          	endbr64
  23:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
* 2a:	80 7c 07 01 00       	cmpb   $0x0,0x1(%rdi,%rax,1) <-- trapping instruction
  2f:	48 8d 40 01          	lea    0x1(%rax),%rax
  33:	75 f5                	jne    0x2a
  35:	c3                   	ret
  36:	cc                   	int3
  37:	cc                   	int3
  38:	cc                   	int3
  39:	cc                   	int3
  3a:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  3f:	90                   	nop