Oops: general protection fault, probably for non-canonical address 0xdffffc000000013c: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000009e0-0x00000000000009e7]
CPU: 1 UID: 0 PID: 21493 Comm: syz.4.3837 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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 kernel/task_work.c:124 [inline]
RIP: 0010:task_work_cancel+0x8a/0x220 kernel/task_work.c:187
Code: b8 f1 f1 f1 f1 f8 f3 f3 f3 4b 89 44 25 00 e8 2d bc 35 00 43 c6 44 25 04 00 49 89 de 48 81 c3 e0 09 00 00 49 89 df 49 c1 ef 03 <43> 80 3c 27 00 74 08 48 89 df e8 37 fe 9f 00 48 83 3b 00 75 51 e8
RSP: 0000:ffffc9000cbcfb20 EFLAGS: 00010206
RAX: ffffffff818fe4b3 RBX: 00000000000009e0 RCX: 0000000000080000
RDX: ffffc90011626000 RSI: 000000000000dbd9 RDI: 000000000000dbda
RBP: ffffc9000cbcfbd0 R08: ffffc9000cbcfc97 R09: 1ffff92001979f92
R10: dffffc0000000000 R11: fffff52001979f93 R12: dffffc0000000000
R13: 1ffff92001979f68 R14: 0000000000000000 R15: 000000000000013c
FS:  0000000000000000(0000) GS:ffff888125560000(0063) knlGS:00000000f545bb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000080041018 CR3: 0000000035da0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 cancel_tsync_works security/landlock/tsync.c:415 [inline]
 landlock_restrict_sibling_threads+0xdc4/0x11f0 security/landlock/tsync.c:533
 __do_sys_landlock_restrict_self security/landlock/syscalls.c:574 [inline]
 __se_sys_landlock_restrict_self+0x540/0x810 security/landlock/syscalls.c:482
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 do_int80_emulation+0x173/0x4d0 arch/x86/entry/syscall_32.c:172
 asm_int80_emulation+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
RIP: 0023:0xf70aef6c
Code: 90 85 d2 74 0a 89 ce 81 e6 ff 0f 00 00 89 32 85 c0 74 05 c1 e9 0c 89 08 31 c0 5e 5d c3 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 58 b8
RSP: 002b:00000000f545b50c EFLAGS: 00000206 ORIG_RAX: 00000000000001be
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000000000c
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </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 kernel/task_work.c:124 [inline]
RIP: 0010:task_work_cancel+0x8a/0x220 kernel/task_work.c:187
Code: b8 f1 f1 f1 f1 f8 f3 f3 f3 4b 89 44 25 00 e8 2d bc 35 00 43 c6 44 25 04 00 49 89 de 48 81 c3 e0 09 00 00 49 89 df 49 c1 ef 03 <43> 80 3c 27 00 74 08 48 89 df e8 37 fe 9f 00 48 83 3b 00 75 51 e8
RSP: 0000:ffffc9000cbcfb20 EFLAGS: 00010206
RAX: ffffffff818fe4b3 RBX: 00000000000009e0 RCX: 0000000000080000
RDX: ffffc90011626000 RSI: 000000000000dbd9 RDI: 000000000000dbda
RBP: ffffc9000cbcfbd0 R08: ffffc9000cbcfc97 R09: 1ffff92001979f92
R10: dffffc0000000000 R11: fffff52001979f93 R12: dffffc0000000000
R13: 1ffff92001979f68 R14: 0000000000000000 R15: 000000000000013c
FS:  0000000000000000(0000) GS:ffff888125560000(0063) knlGS:00000000f545bb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000034612ff8 CR3: 0000000035da0000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	b8 f1 f1 f1 f1       	mov    $0xf1f1f1f1,%eax
   5:	f8                   	clc
   6:	f3 f3 f3 4b 89 44 25 	repz repz xrelease mov %rax,0x0(%r13,%r12,1)
   d:	00
   e:	e8 2d bc 35 00       	call   0x35bc40
  13:	43 c6 44 25 04 00    	movb   $0x0,0x4(%r13,%r12,1)
  19:	49 89 de             	mov    %rbx,%r14
  1c:	48 81 c3 e0 09 00 00 	add    $0x9e0,%rbx
  23:	49 89 df             	mov    %rbx,%r15
  26:	49 c1 ef 03          	shr    $0x3,%r15
* 2a:	43 80 3c 27 00       	cmpb   $0x0,(%r15,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 37 fe 9f 00       	call   0x9ffe70
  39:	48 83 3b 00          	cmpq   $0x0,(%rbx)
  3d:	75 51                	jne    0x90
  3f:	e8                   	.byte 0xe8