* [moderation/CI] Re: bpf: Add preempt disable for bpf_get_stack
@ 2026-02-06 13:14 syzbot ci
2026-02-06 14:18 ` Aleksandr Nogikh
0 siblings, 1 reply; 2+ messages in thread
From: syzbot ci @ 2026-02-06 13:14 UTC (permalink / raw)
To: syzkaller-upstream-moderation; +Cc: syzbot
syzbot ci has tested the following series
[v2] bpf: Add preempt disable for bpf_get_stack
https://lore.kernel.org/all/20260206090653.1336687-1-chen.dylane@linux.dev
* [PATCH bpf-next v2 1/2] bpf: Add preempt disable for bpf_get_stack
* [PATCH bpf-next v2 2/2] bpf: Add preempt disable for bpf_get_stackid
and found the following issue:
WARNING in preempt_count_sub
Full report is available here:
https://ci.syzbot.org/series/90d08df2-d19d-404f-b9dd-c201605b83a2
***
WARNING in preempt_count_sub
tree: bpf-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git
base: 1ace9bac1ad2bc6a0a70baaa16d22b7e783e88c5
arch: amd64
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config: https://ci.syzbot.org/builds/64881591-241a-4854-9beb-1f691566835c/config
C repro: https://ci.syzbot.org/findings/98f347c8-b879-4c85-829b-a20ef900e645/c_repro
syz repro: https://ci.syzbot.org/findings/98f347c8-b879-4c85-829b-a20ef900e645/syz_repro
------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(val > preempt_count())
WARNING: kernel/sched/core.c:5751 at preempt_count_sub+0x9e/0x170 kernel/sched/core.c:5751, CPU#0: syz.0.17/5991
Modules linked in:
CPU: 0 UID: 0 PID: 5991 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:preempt_count_sub+0xa5/0x170 kernel/sched/core.c:5751
Code: 05 cf 8f 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 88 00 00 00 83 3d ef 21 3d 0e 00 75 13 48 8d 3d b2 f3 3f 0e 48 c7 c6 a0 fe 8b 8b <67> 48 0f b9 3a 90 eb b8 90 e8 5d ab 03 03 85 c0 74 2f 48 c7 c0 a4
RSP: 0018:ffffc90004437bc8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff8881746f8000
RDX: 0000000000000000 RSI: ffffffff8b8bfea0 RDI: ffffffff8fd1d770
RBP: ffffc90004437cd0 R08: ffffffff8fcf05a3 R09: 1ffffffff1f9e0b4
R10: dffffc0000000000 R11: fffffbfff1f9e0b5 R12: dffffc0000000000
R13: 1ffff92000886f84 R14: 0000000000000000 R15: 0000000000000000
FS: 000055557d481500(0000) GS:ffff88818e328000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1f89c706c0 CR3: 00000001742f0000 CR4: 00000000000006f0
Call Trace:
<TASK>
bpf_prog_test_run_raw_tp+0x4b9/0x6c0 net/bpf/test_run.c:794
bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4721
__sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6246
__do_sys_bpf kernel/bpf/syscall.c:6341 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6339 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1f89d9acb9
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:00007fff9e3fd488 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f1f8a015fa0 RCX: 00007f1f89d9acb9
RDX: 000000000000000c RSI: 0000200000000500 RDI: 000000000000000a
RBP: 00007f1f89e08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1f8a015fac R14: 00007f1f8a015fa0 R15: 00007f1f8a015fa0
</TASK>
----------------
Code disassembly (best guess):
0: 05 cf 8f 48 c1 add $0xc1488fcf,%eax
5: e8 03 0f b6 04 call 0x4b60f0d
a: 18 84 c0 0f 85 88 00 sbb %al,0x88850f(%rax,%rax,8)
11: 00 00 add %al,(%rax)
13: 83 3d ef 21 3d 0e 00 cmpl $0x0,0xe3d21ef(%rip) # 0xe3d2209
1a: 75 13 jne 0x2f
1c: 48 8d 3d b2 f3 3f 0e lea 0xe3ff3b2(%rip),%rdi # 0xe3ff3d5
23: 48 c7 c6 a0 fe 8b 8b mov $0xffffffff8b8bfea0,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 90 nop
30: eb b8 jmp 0xffffffea
32: 90 nop
33: e8 5d ab 03 03 call 0x303ab95
38: 85 c0 test %eax,%eax
3a: 74 2f je 0x6b
3c: 48 rex.W
3d: c7 .byte 0xc7
3e: c0 .byte 0xc0
3f: a4 movsb %ds:(%rsi),%es:(%rdi)
***
If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syzbot@syzkaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@googlegroups.com.
The email will later be sent to:
[andrii@kernel.org ast@kernel.org bpf@vger.kernel.org chen.dylane@linux.dev daniel@iogearbox.net eddyz87@gmail.com haoluo@google.com john.fastabend@gmail.com jolsa@kernel.org kpsingh@kernel.org linux-kernel@vger.kernel.org martin.lau@linux.dev sdf@fomichev.me song@kernel.org yonghong.song@linux.dev]
If the report looks fine to you, reply with:
#syz upstream
If the report is a false positive, reply with
#syz invalid
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [moderation/CI] Re: bpf: Add preempt disable for bpf_get_stack
2026-02-06 13:14 [moderation/CI] Re: bpf: Add preempt disable for bpf_get_stack syzbot ci
@ 2026-02-06 14:18 ` Aleksandr Nogikh
0 siblings, 0 replies; 2+ messages in thread
From: Aleksandr Nogikh @ 2026-02-06 14:18 UTC (permalink / raw)
To: syzbot ci; +Cc: syzkaller-upstream-moderation, syzbot
#syz upstream
On Fri, Feb 6, 2026 at 2:14 PM syzbot ci
<syzbot+ci1ea0462c6f16682e@syzkaller.appspotmail.com> wrote:
>
> syzbot ci has tested the following series
>
> [v2] bpf: Add preempt disable for bpf_get_stack
> https://lore.kernel.org/all/20260206090653.1336687-1-chen.dylane@linux.dev
> * [PATCH bpf-next v2 1/2] bpf: Add preempt disable for bpf_get_stack
> * [PATCH bpf-next v2 2/2] bpf: Add preempt disable for bpf_get_stackid
>
> and found the following issue:
> WARNING in preempt_count_sub
>
> Full report is available here:
> https://ci.syzbot.org/series/90d08df2-d19d-404f-b9dd-c201605b83a2
>
> ***
>
> WARNING in preempt_count_sub
>
> tree: bpf-next
> URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git
> base: 1ace9bac1ad2bc6a0a70baaa16d22b7e783e88c5
> arch: amd64
> compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
> config: https://ci.syzbot.org/builds/64881591-241a-4854-9beb-1f691566835c/config
> C repro: https://ci.syzbot.org/findings/98f347c8-b879-4c85-829b-a20ef900e645/c_repro
> syz repro: https://ci.syzbot.org/findings/98f347c8-b879-4c85-829b-a20ef900e645/syz_repro
>
> ------------[ cut here ]------------
> DEBUG_LOCKS_WARN_ON(val > preempt_count())
> WARNING: kernel/sched/core.c:5751 at preempt_count_sub+0x9e/0x170 kernel/sched/core.c:5751, CPU#0: syz.0.17/5991
> Modules linked in:
> CPU: 0 UID: 0 PID: 5991 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> RIP: 0010:preempt_count_sub+0xa5/0x170 kernel/sched/core.c:5751
> Code: 05 cf 8f 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 88 00 00 00 83 3d ef 21 3d 0e 00 75 13 48 8d 3d b2 f3 3f 0e 48 c7 c6 a0 fe 8b 8b <67> 48 0f b9 3a 90 eb b8 90 e8 5d ab 03 03 85 c0 74 2f 48 c7 c0 a4
> RSP: 0018:ffffc90004437bc8 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff8881746f8000
> RDX: 0000000000000000 RSI: ffffffff8b8bfea0 RDI: ffffffff8fd1d770
> RBP: ffffc90004437cd0 R08: ffffffff8fcf05a3 R09: 1ffffffff1f9e0b4
> R10: dffffc0000000000 R11: fffffbfff1f9e0b5 R12: dffffc0000000000
> R13: 1ffff92000886f84 R14: 0000000000000000 R15: 0000000000000000
> FS: 000055557d481500(0000) GS:ffff88818e328000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f1f89c706c0 CR3: 00000001742f0000 CR4: 00000000000006f0
> Call Trace:
> <TASK>
> bpf_prog_test_run_raw_tp+0x4b9/0x6c0 net/bpf/test_run.c:794
> bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4721
> __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6246
> __do_sys_bpf kernel/bpf/syscall.c:6341 [inline]
> __se_sys_bpf kernel/bpf/syscall.c:6339 [inline]
> __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339
> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f1f89d9acb9
> 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:00007fff9e3fd488 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
> RAX: ffffffffffffffda RBX: 00007f1f8a015fa0 RCX: 00007f1f89d9acb9
> RDX: 000000000000000c RSI: 0000200000000500 RDI: 000000000000000a
> RBP: 00007f1f89e08bf7 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007f1f8a015fac R14: 00007f1f8a015fa0 R15: 00007f1f8a015fa0
> </TASK>
> ----------------
> Code disassembly (best guess):
> 0: 05 cf 8f 48 c1 add $0xc1488fcf,%eax
> 5: e8 03 0f b6 04 call 0x4b60f0d
> a: 18 84 c0 0f 85 88 00 sbb %al,0x88850f(%rax,%rax,8)
> 11: 00 00 add %al,(%rax)
> 13: 83 3d ef 21 3d 0e 00 cmpl $0x0,0xe3d21ef(%rip) # 0xe3d2209
> 1a: 75 13 jne 0x2f
> 1c: 48 8d 3d b2 f3 3f 0e lea 0xe3ff3b2(%rip),%rdi # 0xe3ff3d5
> 23: 48 c7 c6 a0 fe 8b 8b mov $0xffffffff8b8bfea0,%rsi
> * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
> 2f: 90 nop
> 30: eb b8 jmp 0xffffffea
> 32: 90 nop
> 33: e8 5d ab 03 03 call 0x303ab95
> 38: 85 c0 test %eax,%eax
> 3a: 74 2f je 0x6b
> 3c: 48 rex.W
> 3d: c7 .byte 0xc7
> 3e: c0 .byte 0xc0
> 3f: a4 movsb %ds:(%rsi),%es:(%rdi)
>
>
> ***
>
> If these findings have caused you to resend the series or submit a
> separate fix, please add the following tag to your commit message:
> Tested-by: syzbot@syzkaller.appspotmail.com
>
> ---
> This report is generated by a bot. It may contain errors.
> syzbot ci engineers can be reached at syzkaller@googlegroups.com.
>
> The email will later be sent to:
> [andrii@kernel.org ast@kernel.org bpf@vger.kernel.org chen.dylane@linux.dev daniel@iogearbox.net eddyz87@gmail.com haoluo@google.com john.fastabend@gmail.com jolsa@kernel.org kpsingh@kernel.org linux-kernel@vger.kernel.org martin.lau@linux.dev sdf@fomichev.me song@kernel.org yonghong.song@linux.dev]
>
> If the report looks fine to you, reply with:
> #syz upstream
>
> If the report is a false positive, reply with
> #syz invalid
>
> --
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2026-02-06 13:14 [moderation/CI] Re: bpf: Add preempt disable for bpf_get_stack syzbot ci
2026-02-06 14:18 ` Aleksandr Nogikh
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