Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 22536 Comm: GC for TOMOYO Not tainted 6.13.0-rc3-syzkaller-00044-gaef25be35d23 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
RIP: 0010:tomoyo_collect_acl security/tomoyo/gc.c:511 [inline]
RIP: 0010:tomoyo_collect_entry security/tomoyo/gc.c:537 [inline]
RIP: 0010:tomoyo_gc_thread security/tomoyo/gc.c:619 [inline]
RIP: 0010:tomoyo_gc_thread+0x1ab/0x1390 security/tomoyo/gc.c:612
Code: 9b 61 47 fd c6 45 18 ff 4c 89 ee bf 09 00 00 00 e8 8a f1 ff ff e8 85 61 47 fd 48 89 d8 48 89 de 49 89 dd 48 c1 e8 03 83 e6 07 <42> 0f b6 0c 20 48 8d 43 07 48 89 c2 48 c1 ea 03 42 0f b6 14 22 40
RSP: 0018:ffffc90004adfe78 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8451ed4b
RDX: ffff888028161e00 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffff888026830480 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880256b2080
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0076b452d8 CR3: 000000002929a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:tomoyo_collect_acl security/tomoyo/gc.c:511 [inline]
RIP: 0010:tomoyo_collect_entry security/tomoyo/gc.c:537 [inline]
RIP: 0010:tomoyo_gc_thread security/tomoyo/gc.c:619 [inline]
RIP: 0010:tomoyo_gc_thread+0x1ab/0x1390 security/tomoyo/gc.c:612
Code: 9b 61 47 fd c6 45 18 ff 4c 89 ee bf 09 00 00 00 e8 8a f1 ff ff e8 85 61 47 fd 48 89 d8 48 89 de 49 89 dd 48 c1 e8 03 83 e6 07 <42> 0f b6 0c 20 48 8d 43 07 48 89 c2 48 c1 ea 03 42 0f b6 14 22 40
RSP: 0018:ffffc90004adfe78 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8451ed4b
RDX: ffff888028161e00 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffff888026830480 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880256b2080
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020002980 CR3: 00000000694a8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	47 fd                	rex.RXB std
   2:	c6 45 18 ff          	movb   $0xff,0x18(%rbp)
   6:	4c 89 ee             	mov    %r13,%rsi
   9:	bf 09 00 00 00       	mov    $0x9,%edi
   e:	e8 8a f1 ff ff       	call   0xfffff19d
  13:	e8 85 61 47 fd       	call   0xfd47619d
  18:	48 89 d8             	mov    %rbx,%rax
  1b:	48 89 de             	mov    %rbx,%rsi
  1e:	49 89 dd             	mov    %rbx,%r13
  21:	48 c1 e8 03          	shr    $0x3,%rax
  25:	83 e6 07             	and    $0x7,%esi
* 28:	42 0f b6 0c 20       	movzbl (%rax,%r12,1),%ecx <-- trapping instruction
  2d:	48 8d 43 07          	lea    0x7(%rbx),%rax
  31:	48 89 c2             	mov    %rax,%rdx
  34:	48 c1 ea 03          	shr    $0x3,%rdx
  38:	42 0f b6 14 22       	movzbl (%rdx,%r12,1),%edx
  3d:	40                   	rex