Oops: general protection fault, probably for non-canonical address 0xdffffc000000013c: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000009e0-0x00000000000009e7]
CPU: 0 UID: 0 PID: 17346 Comm: syz.3.2375 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:task_work_pending include/linux/task_work.h:26 [inline]
RIP: 0010:task_work_cancel_match+0x86/0x250 kernel/task_work.c:124
Code: 40 04 00 f3 f3 f3 65 48 8b 05 be 6b 3c 12 48 89 44 24 70 31 c0 e8 ea 84 37 00 4c 89 f8 48 c7 44 24 38 00 00 00 00 48 c1 e8 03 <42> 80 3c 30 00 0f 85 7e 01 00 00 4c 8b b3 e0 09 00 00 4d 85 f6 75
RSP: 0018:ffffc9000513fba0 EFLAGS: 00010216
RAX: 000000000000013c RBX: 0000000000000000 RCX: ffffc90010a06000
RDX: 0000000000080000 RSI: ffffffff81d11456 RDI: 0000000000000000
RBP: 1ffff92000a27f77 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000000 R12: ffffffff81d10ff0
R13: ffff888031a7de00 R14: dffffc0000000000 R15: 00000000000009e0
FS:  00007f9ba89af6c0(0000) GS:ffff888124348000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5269d621d4 CR3: 0000000066b51000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 task_work_cancel+0x23/0x30 kernel/task_work.c:187
 cancel_tsync_works security/landlock/tsync.c:415 [inline]
 landlock_restrict_sibling_threads+0xafe/0x1280 security/landlock/tsync.c:533
 __do_sys_landlock_restrict_self+0x5c9/0x9e0 security/landlock/syscalls.c:574
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9ba7b9c799
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:00007f9ba89af028 EFLAGS: 00000246 ORIG_RAX: 00000000000001be
RAX: ffffffffffffffda RBX: 00007f9ba7e16090 RCX: 00007f9ba7b9c799
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000003
RBP: 00007f9ba7c32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9ba7e16128 R14: 00007f9ba7e16090 R15: 00007ffc88c7e038
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:task_work_pending include/linux/task_work.h:26 [inline]
RIP: 0010:task_work_cancel_match+0x86/0x250 kernel/task_work.c:124
Code: 40 04 00 f3 f3 f3 65 48 8b 05 be 6b 3c 12 48 89 44 24 70 31 c0 e8 ea 84 37 00 4c 89 f8 48 c7 44 24 38 00 00 00 00 48 c1 e8 03 <42> 80 3c 30 00 0f 85 7e 01 00 00 4c 8b b3 e0 09 00 00 4d 85 f6 75
RSP: 0018:ffffc9000513fba0 EFLAGS: 00010216
RAX: 000000000000013c RBX: 0000000000000000 RCX: ffffc90010a06000
RDX: 0000000000080000 RSI: ffffffff81d11456 RDI: 0000000000000000
RBP: 1ffff92000a27f77 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000000 R12: ffffffff81d10ff0
R13: ffff888031a7de00 R14: dffffc0000000000 R15: 00000000000009e0
FS:  00007f9ba89af6c0(0000) GS:ffff888124348000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3711be CR3: 0000000066b51000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	40 04 00             	rex add $0x0,%al
   3:	f3 f3 f3 65 48 8b 05 	repz repz repz mov %gs:0x123c6bbe(%rip),%rax        # 0x123c6bcc
   a:	be 6b 3c 12
   e:	48 89 44 24 70       	mov    %rax,0x70(%rsp)
  13:	31 c0                	xor    %eax,%eax
  15:	e8 ea 84 37 00       	call   0x378504
  1a:	4c 89 f8             	mov    %r15,%rax
  1d:	48 c7 44 24 38 00 00 	movq   $0x0,0x38(%rsp)
  24:	00 00
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1) <-- trapping instruction
  2f:	0f 85 7e 01 00 00    	jne    0x1b3
  35:	4c 8b b3 e0 09 00 00 	mov    0x9e0(%rbx),%r14
  3c:	4d 85 f6             	test   %r14,%r14
  3f:	75                   	.byte 0x75