* [syzbot] [kernel?] general protection fault in task_work_cancel
@ 2026-03-07 5:17 syzbot
2026-03-08 3:46 ` [syzbot] [fuse?] " syzbot
0 siblings, 1 reply; 5+ messages in thread
From: syzbot @ 2026-03-07 5:17 UTC (permalink / raw)
To: linux-kernel, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: af4e9ef3d784 uaccess: Fix scoped_user_read_access() for 'p..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13774952580000
kernel config: https://syzkaller.appspot.com/x/.config?x=779072223d02a312
dashboard link: https://syzkaller.appspot.com/bug?extid=741e2278ef71fef03a10
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f6b75c8f432f/disk-af4e9ef3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4513ad566789/vmlinux-af4e9ef3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f7eea878db42/bzImage-af4e9ef3.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+741e2278ef71fef03a10@syzkaller.appspotmail.com
Oops: general protection fault, probably for non-canonical address 0xdffffc000000013c: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000009e0-0x00000000000009e7]
CPU: 1 UID: 0 PID: 8400 Comm: syz.0.629 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 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 bd b6 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 17 f5 9f 00 48 83 3b 00 75 51 e8
RSP: 0018:ffffc9001eadfb20 EFLAGS: 00010216
RAX: ffffffff818fdf23 RBX: 00000000000009e0 RCX: 0000000000080000
RDX: ffffc9000e905000 RSI: 00000000000099dd RDI: 00000000000099de
RBP: ffffc9001eadfbd0 R08: ffffc9001eadfc97 R09: 1ffff92003d5bf92
R10: dffffc0000000000 R11: fffff52003d5bf93 R12: dffffc0000000000
R13: 1ffff92003d5bf68 R14: 0000000000000000 R15: 000000000000013c
FS: 00007f83f86a96c0(0000) GS:ffff888125564000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff8027ea4b8 CR3: 0000000021f07000 CR4: 0000000000350ef0
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: 0033:0x7f83f779c799
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:00007f83f86a9028 EFLAGS: 00000246 ORIG_RAX: 00000000000001be
RAX: ffffffffffffffda RBX: 00007f83f7a16090 RCX: 00007f83f779c799
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000004
RBP: 00007f83f7832bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f83f7a16128 R14: 00007f83f7a16090 R15: 00007fff928f0338
</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 bd b6 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 17 f5 9f 00 48 83 3b 00 75 51 e8
RSP: 0018:ffffc9001eadfb20 EFLAGS: 00010216
RAX: ffffffff818fdf23 RBX: 00000000000009e0 RCX: 0000000000080000
RDX: ffffc9000e905000 RSI: 00000000000099dd RDI: 00000000000099de
RBP: ffffc9001eadfbd0 R08: ffffc9001eadfc97 R09: 1ffff92003d5bf92
R10: dffffc0000000000 R11: fffff52003d5bf93 R12: dffffc0000000000
R13: 1ffff92003d5bf68 R14: 0000000000000000 R15: 000000000000013c
FS: 00007f83f86a96c0(0000) GS:ffff888125564000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faa33e5c000 CR3: 0000000021f07000 CR4: 0000000000350ef0
----------------
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 bd b6 35 00 call 0x35b6d0
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 17 f5 9f 00 call 0x9ff550
39: 48 83 3b 00 cmpq $0x0,(%rbx)
3d: 75 51 jne 0x90
3f: e8 .byte 0xe8
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [fuse?] general protection fault in task_work_cancel
2026-03-07 5:17 [syzbot] [kernel?] general protection fault in task_work_cancel syzbot
@ 2026-03-08 3:46 ` syzbot
2026-03-10 12:51 ` Günther Noack
2026-03-10 12:59 ` Günther Noack
0 siblings, 2 replies; 5+ messages in thread
From: syzbot @ 2026-03-08 3:46 UTC (permalink / raw)
To: gnoack, linux-fsdevel, linux-kernel, linux-security-module, mic,
miklos, penguin-kernel, syzkaller-bugs
syzbot has found a reproducer for the following issue on:
HEAD commit: 4ae12d8bd9a8 Merge tag 'kbuild-fixes-7.0-2' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17dc475a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=779072223d02a312
dashboard link: https://syzkaller.appspot.com/bug?extid=741e2278ef71fef03a10
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=130b075a580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/010ac4052aed/disk-4ae12d8b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2aad8bef9031/vmlinux-4ae12d8b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/fd350ec4896a/bzImage-4ae12d8b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+741e2278ef71fef03a10@syzkaller.appspotmail.com
Oops: general protection fault, probably for non-canonical address 0xdffffc000000013c: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000009e0-0x00000000000009e7]
CPU: 1 UID: 0 PID: 13249 Comm: syz.1.1775 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 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 17 fe 9f 00 48 83 3b 00 75 51 e8
RSP: 0018:ffffc9000ddffb20 EFLAGS: 00010216
RAX: ffffffff818fdfc3 RBX: 00000000000009e0 RCX: ffff88805d5c3d00
RDX: 0000000000000000 RSI: ffff888032f5c540 RDI: 0000000000000000
RBP: ffffc9000ddffbd0 R08: ffffc9000ddffc97 R09: 1ffff92001bbff92
R10: dffffc0000000000 R11: fffff52001bbff93 R12: dffffc0000000000
R13: 1ffff92001bbff68 R14: 0000000000000000 R15: 000000000000013c
FS: 00007f9c8a1cb6c0(0000) GS:ffff888125561000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000010000 CR3: 0000000059bf0000 CR4: 0000000000350ef0
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: 0033:0x7f9c8939c799
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:00007f9c8a1cb028 EFLAGS: 00000246 ORIG_RAX: 00000000000001be
RAX: ffffffffffffffda RBX: 00007f9c89616180 RCX: 00007f9c8939c799
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000003
RBP: 00007f9c89432bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9c89616218 R14: 00007f9c89616180 R15: 00007ffee5d65d48
</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 17 fe 9f 00 48 83 3b 00 75 51 e8
RSP: 0018:ffffc9000ddffb20 EFLAGS: 00010216
RAX: ffffffff818fdfc3 RBX: 00000000000009e0 RCX: ffff88805d5c3d00
RDX: 0000000000000000 RSI: ffff888032f5c540 RDI: 0000000000000000
RBP: ffffc9000ddffbd0 R08: ffffc9000ddffc97 R09: 1ffff92001bbff92
R10: dffffc0000000000 R11: fffff52001bbff93 R12: dffffc0000000000
R13: 1ffff92001bbff68 R14: 0000000000000000 R15: 000000000000013c
FS: 00007f9c8a1cb6c0(0000) GS:ffff888125561000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f810d34da08 CR3: 0000000059bf0000 CR4: 0000000000350ef0
----------------
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 17 fe 9f 00 call 0x9ffe50
39: 48 83 3b 00 cmpq $0x0,(%rbx)
3d: 75 51 jne 0x90
3f: e8 .byte 0xe8
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [fuse?] general protection fault in task_work_cancel
2026-03-08 3:46 ` [syzbot] [fuse?] " syzbot
@ 2026-03-10 12:51 ` Günther Noack
2026-03-10 12:51 ` syzbot
2026-03-10 12:59 ` Günther Noack
1 sibling, 1 reply; 5+ messages in thread
From: Günther Noack @ 2026-03-10 12:51 UTC (permalink / raw)
To: syzbot
Cc: linux-fsdevel, linux-kernel, linux-security-module, mic, miklos,
penguin-kernel, syzkaller-bugs
On Sat, Mar 07, 2026 at 07:46:25PM -0800, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 4ae12d8bd9a8 Merge tag 'kbuild-fixes-7.0-2' of git://git.k..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=17dc475a580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=779072223d02a312
> dashboard link: https://syzkaller.appspot.com/bug?extid=741e2278ef71fef03a10
> compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=130b075a580000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/010ac4052aed/disk-4ae12d8b.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/2aad8bef9031/vmlinux-4ae12d8b.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/fd350ec4896a/bzImage-4ae12d8b.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+741e2278ef71fef03a10@syzkaller.appspotmail.com
#syz dup: general protection fault in task_work_cancel_match
#syz set subsystems: lsm
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [fuse?] general protection fault in task_work_cancel
2026-03-10 12:51 ` Günther Noack
@ 2026-03-10 12:51 ` syzbot
0 siblings, 0 replies; 5+ messages in thread
From: syzbot @ 2026-03-10 12:51 UTC (permalink / raw)
To: gnoack
Cc: gnoack, linux-fsdevel, linux-kernel, linux-security-module, mic,
miklos, penguin-kernel, syzkaller-bugs
> On Sat, Mar 07, 2026 at 07:46:25PM -0800, syzbot wrote:
>> syzbot has found a reproducer for the following issue on:
>>
>> HEAD commit: 4ae12d8bd9a8 Merge tag 'kbuild-fixes-7.0-2' of git://git.k..
>> git tree: upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=17dc475a580000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=779072223d02a312
>> dashboard link: https://syzkaller.appspot.com/bug?extid=741e2278ef71fef03a10
>> compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=130b075a580000
>>
>> Downloadable assets:
>> disk image: https://storage.googleapis.com/syzbot-assets/010ac4052aed/disk-4ae12d8b.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/2aad8bef9031/vmlinux-4ae12d8b.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/fd350ec4896a/bzImage-4ae12d8b.xz
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+741e2278ef71fef03a10@syzkaller.appspotmail.com
>
> #syz dup: general protection fault in task_work_cancel_match
> #syz set subsystems: lsm
Command #1:
Can't dup bug to a bug in different reporting (upstream->moderation2).Please dup syzbot bugs only onto syzbot bugs for the same kernel/reporting.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [fuse?] general protection fault in task_work_cancel
2026-03-08 3:46 ` [syzbot] [fuse?] " syzbot
2026-03-10 12:51 ` Günther Noack
@ 2026-03-10 12:59 ` Günther Noack
1 sibling, 0 replies; 5+ messages in thread
From: Günther Noack @ 2026-03-10 12:59 UTC (permalink / raw)
To: syzbot
Cc: linux-fsdevel, linux-kernel, linux-security-module, mic, miklos,
penguin-kernel, syzkaller-bugs
On Sat, Mar 07, 2026 at 07:46:25PM -0800, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 4ae12d8bd9a8 Merge tag 'kbuild-fixes-7.0-2' of git://git.k..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=17dc475a580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=779072223d02a312
> dashboard link: https://syzkaller.appspot.com/bug?extid=741e2278ef71fef03a10
> compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=130b075a580000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/010ac4052aed/disk-4ae12d8b.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/2aad8bef9031/vmlinux-4ae12d8b.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/fd350ec4896a/bzImage-4ae12d8b.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+741e2278ef71fef03a10@syzkaller.appspotmail.com
>
> Oops: general protection fault, probably for non-canonical address 0xdffffc000000013c: 0000 [#1] SMP KASAN NOPTI
> KASAN: null-ptr-deref in range [0x00000000000009e0-0x00000000000009e7]
> CPU: 1 UID: 0 PID: 13249 Comm: syz.1.1775 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 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 17 fe 9f 00 48 83 3b 00 75 51 e8
> RSP: 0018:ffffc9000ddffb20 EFLAGS: 00010216
> RAX: ffffffff818fdfc3 RBX: 00000000000009e0 RCX: ffff88805d5c3d00
> RDX: 0000000000000000 RSI: ffff888032f5c540 RDI: 0000000000000000
> RBP: ffffc9000ddffbd0 R08: ffffc9000ddffc97 R09: 1ffff92001bbff92
> R10: dffffc0000000000 R11: fffff52001bbff93 R12: dffffc0000000000
> R13: 1ffff92001bbff68 R14: 0000000000000000 R15: 000000000000013c
> FS: 00007f9c8a1cb6c0(0000) GS:ffff888125561000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000200000010000 CR3: 0000000059bf0000 CR4: 0000000000350ef0
> 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: 0033:0x7f9c8939c799
> 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:00007f9c8a1cb028 EFLAGS: 00000246 ORIG_RAX: 00000000000001be
> RAX: ffffffffffffffda RBX: 00007f9c89616180 RCX: 00007f9c8939c799
> RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000003
> RBP: 00007f9c89432bd9 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007f9c89616218 R14: 00007f9c89616180 R15: 00007ffee5d65d48
> </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 17 fe 9f 00 48 83 3b 00 75 51 e8
> RSP: 0018:ffffc9000ddffb20 EFLAGS: 00010216
> RAX: ffffffff818fdfc3 RBX: 00000000000009e0 RCX: ffff88805d5c3d00
> RDX: 0000000000000000 RSI: ffff888032f5c540 RDI: 0000000000000000
> RBP: ffffc9000ddffbd0 R08: ffffc9000ddffc97 R09: 1ffff92001bbff92
> R10: dffffc0000000000 R11: fffff52001bbff93 R12: dffffc0000000000
> R13: 1ffff92001bbff68 R14: 0000000000000000 R15: 000000000000013c
> FS: 00007f9c8a1cb6c0(0000) GS:ffff888125561000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f810d34da08 CR3: 0000000059bf0000 CR4: 0000000000350ef0
> ----------------
> 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 17 fe 9f 00 call 0x9ffe50
> 39: 48 83 3b 00 cmpq $0x0,(%rbx)
> 3d: 75 51 jne 0x90
> 3f: e8 .byte 0xe8
>
>
> ---
> If you want syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash
> If you attach or paste a git patch, syzbot will apply it before testing.
#syz fix: landlock: Fully release unused TSYNC work entries
(See https://github.com/google/syzkaller/blob/master/docs/syzbot.md#communication-with-syzbot)
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2026-03-10 13:00 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-03-07 5:17 [syzbot] [kernel?] general protection fault in task_work_cancel syzbot
2026-03-08 3:46 ` [syzbot] [fuse?] " syzbot
2026-03-10 12:51 ` Günther Noack
2026-03-10 12:51 ` syzbot
2026-03-10 12:59 ` Günther Noack
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox