Oops: general protection fault, probably for non-canonical address 0xdffffc000000013c: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000009e0-0x00000000000009e7]
CPU: 0 UID: 0 PID: 30445 Comm: syz.0.6287 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 ad b9 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 c7 fc 9f 00 48 83 3b 00 75 51 e8
RSP: 0018:ffffc900001f7b20 EFLAGS: 00010206
RAX: ffffffff818fdfc3 RBX: 00000000000009e0 RCX: ffff88802e3a9e80
RDX: 0000000000000003 RSI: ffff88801dfcbf80 RDI: 0000000000000000
RBP: ffffc900001f7bd0 R08: 0000000000000da7 R09: 0000000000400000
R10: 000000000001b4e8 R11: fffff5200003ef93 R12: dffffc0000000000
R13: 1ffff9200003ef68 R14: 0000000000000000 R15: 000000000000013c
FS: 00007f7880fac6c0(0000) GS:ffff888125461000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000039e030 CR3: 0000000095f7e000 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_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7882d9c799
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:00007f7880fac028 EFLAGS: 00000246 ORIG_RAX: 00000000000001be
RAX: ffffffffffffffda RBX: 00007f7883016180 RCX: 00007f7882d9c799
RDX: 0000000000000000 RSI: 000000000000000c RDI: 0000000000000008
RBP: 00007f7882e32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7883016218 R14: 00007f7883016180 R15: 00007f788313fa48
</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 ad b9 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 c7 fc 9f 00 48 83 3b 00 75 51 e8
RSP: 0018:ffffc900001f7b20 EFLAGS: 00010206
RAX: ffffffff818fdfc3 RBX: 00000000000009e0 RCX: ffff88802e3a9e80
RDX: 0000000000000003 RSI: ffff88801dfcbf80 RDI: 0000000000000000
RBP: ffffc900001f7bd0 R08: 0000000000000da7 R09: 0000000000400000
R10: 000000000001b4e8 R11: fffff5200003ef93 R12: dffffc0000000000
R13: 1ffff9200003ef68 R14: 0000000000000000 R15: 000000000000013c
FS: 00007f7880fac6c0(0000) GS:ffff888125461000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffa64a0b6b0 CR3: 0000000095f7e000 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 ad b9 35 00 call 0x35b9c0
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 c7 fc 9f 00 call 0x9ffd00
39: 48 83 3b 00 cmpq $0x0,(%rbx)
3d: 75 51 jne 0x90
3f: e8 .byte 0xe8