general protection fault, probably for non-canonical address 0xdffffc018f4e944e: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: probably user-memory-access in range [0x0000000c7a74a270-0x0000000c7a74a277]
CPU: 1 PID: 6271 Comm: syz-executor.2 Not tainted 6.9.0-rc6-syzkaller-00053-g0106679839f7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:smk_of_inode security/smack/smack.h:373 [inline]
RIP: 0010:smack_inode_permission+0x2bf/0x380 security/smack/smack_lsm.c:1234
Code: 49 83 c7 38 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 32 3d 97 fd 4c 63 35 53 9f 73 09 4d 03 37 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 13 3d 97 fd 49 8b 3e 8b 74 24 14 4c
RSP: 0018:ffffc9000a9bf900 EFLAGS: 00010206
RAX: 000000018f4e944e RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000a9bf948
RBP: ffffc9000a9bfa18 R08: ffffc9000a9bf987 R09: 0000000000000000
R10: ffffc9000a9bf968 R11: fffff52001537f31 R12: 1ffff92001537f24
R13: ffffc9000a9bf940 R14: 0000000c7a74a270 R15: ffff8880519460e8
FS:  000055557c39c480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff57c1a8000 CR3: 0000000062320000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 security_inode_permission+0xa5/0x100 security/security.c:2216
 may_lookup fs/namei.c:1726 [inline]
 link_path_walk+0x2ef/0xea0 fs/namei.c:2273
 path_lookupat+0xa9/0x450 fs/namei.c:2484
 filename_lookup+0x256/0x610 fs/namei.c:2514
 user_path_at_empty+0x42/0x60 fs/namei.c:2921
 user_path_at include/linux/namei.h:57 [inline]
 ksys_umount fs/namespace.c:1916 [inline]
 __do_sys_umount fs/namespace.c:1924 [inline]
 __se_sys_umount fs/namespace.c:1922 [inline]
 __x64_sys_umount+0xf4/0x170 fs/namespace.c:1922
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4ee5c7f1d7
Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffdf4d54958 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007f4ee5cc93b9 RCX: 00007f4ee5c7f1d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdf4d54a10
RBP: 00007ffdf4d54a10 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdf4d55b00
R13: 00007f4ee5cc93b9 R14: 0000000000033c8a R15: 000000000000001c
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:smk_of_inode security/smack/smack.h:373 [inline]
RIP: 0010:smack_inode_permission+0x2bf/0x380 security/smack/smack_lsm.c:1234
Code: 49 83 c7 38 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 32 3d 97 fd 4c 63 35 53 9f 73 09 4d 03 37 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 13 3d 97 fd 49 8b 3e 8b 74 24 14 4c
RSP: 0018:ffffc9000a9bf900 EFLAGS: 00010206
RAX: 000000018f4e944e RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000a9bf948
RBP: ffffc9000a9bfa18 R08: ffffc9000a9bf987 R09: 0000000000000000
R10: ffffc9000a9bf968 R11: fffff52001537f31 R12: 1ffff92001537f24
R13: ffffc9000a9bf940 R14: 0000000c7a74a270 R15: ffff8880519460e8
FS:  000055557c39c480(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe90e151000 CR3: 0000000062320000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	49 83 c7 38          	add    $0x38,%r15
   4:	4c 89 f8             	mov    %r15,%rax
   7:	48 c1 e8 03          	shr    $0x3,%rax
   b:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
   f:	74 08                	je     0x19
  11:	4c 89 ff             	mov    %r15,%rdi
  14:	e8 32 3d 97 fd       	call   0xfd973d4b
  19:	4c 63 35 53 9f 73 09 	movslq 0x9739f53(%rip),%r14        # 0x9739f73
  20:	4d 03 37             	add    (%r15),%r14
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 f7             	mov    %r14,%rdi
  33:	e8 13 3d 97 fd       	call   0xfd973d4b
  38:	49 8b 3e             	mov    (%r14),%rdi
  3b:	8b 74 24 14          	mov    0x14(%rsp),%esi
  3f:	4c                   	rex.WR