From: syzbot <syzbot+2524754f17993441bf66@syzkaller.appspotmail.com>
To: acme@kernel.org, adrian.hunter@intel.com,
alexander.shishkin@linux.intel.com, irogers@google.com,
jolsa@kernel.org, kan.liang@linux.intel.com,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
mark.rutland@arm.com, mingo@redhat.com, namhyung@kernel.org,
netdev@vger.kernel.org, peterz@infradead.org,
syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [perf?] WARNING in __perf_event_overflow (2)
Date: Tue, 07 Oct 2025 09:18:26 -0700 [thread overview]
Message-ID: <68e53d52.a00a0220.298cc0.047d.GAE@google.com> (raw)
In-Reply-To: <681c8009.050a0220.654ca.0000.GAE@google.com>
syzbot has found a reproducer for the following issue on:
HEAD commit: de7342228b73 bpf: Finish constification of 1st parameter o..
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=16e75a7c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1e0e0bf7e51565cd
dashboard link: https://syzkaller.appspot.com/bug?extid=2524754f17993441bf66
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=167761e2580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16b941e2580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/48d49cec8205/disk-de734222.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0c197aec9229/vmlinux-de734222.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7f7872725138/bzImage-de734222.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2524754f17993441bf66@syzkaller.appspotmail.com
------------[ cut here ]------------
WARNING: CPU: 1 PID: 6380 at kernel/events/core.c:10369 __perf_event_overflow+0xb3b/0xe40 kernel/events/core.c:10369
Modules linked in:
CPU: 1 UID: 0 PID: 6380 Comm: syz.3.105 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__perf_event_overflow+0xb3b/0xe40 kernel/events/core.c:10369
Code: 08 4c 89 f7 e8 a6 f9 34 00 4d 89 3e e9 bc fa ff ff 48 c7 44 24 40 00 00 00 00 e8 d0 55 cf ff e9 1c fe ff ff e8 c6 55 cf ff 90 <0f> 0b 90 e9 2d ff ff ff e8 b8 55 cf ff 48 c7 c7 a0 fa 73 8b e8 ec
RSP: 0018:ffffc9000afd74c0 EFLAGS: 00010293
RAX: ffffffff81efce8a RBX: 1ffff1100b67a3b5 RCX: ffff8880572d0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000afd75d0 R08: ffff88805b3d1b4f R09: 1ffff1100b67a369
R10: dffffc0000000000 R11: ffffed100b67a36a R12: dffffc0000000000
R13: ffff88805b3d1900 R14: ffff88805b3d1b48 R15: 0000000000000000
FS: 00007fd06a42e6c0(0000) GS:ffff888125e27000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000114bc000 CR4: 00000000003526f0
Call Trace:
<TASK>
perf_swevent_overflow kernel/events/core.c:10467 [inline]
perf_swevent_event+0x2f4/0x5e0 kernel/events/core.c:-1
do_perf_sw_event kernel/events/core.c:10607 [inline]
___perf_sw_event+0x4a1/0x700 kernel/events/core.c:10634
__perf_sw_event+0xfa/0x1a0 kernel/events/core.c:10646
perf_sw_event include/linux/perf_event.h:1596 [inline]
do_user_addr_fault+0x12d9/0x1380 arch/x86/mm/fault.c:1283
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:74
Code: 35 04 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 <f3> a4 e9 4f 35 04 00 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48
RSP: 0018:ffffc9000afd7af0 EFLAGS: 00050202
RAX: 00007ffffffff001 RBX: 0000000000000060 RCX: 0000000000000060
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffc9000af0d060
RBP: 0000000000000000 R08: ffffc9000af0d0bf R09: 1ffff920015e1a17
R10: dffffc0000000000 R11: fffff520015e1a18 R12: ffffc9000af0d060
R13: dffffc0000000000 R14: ffffc9000af0d060 R15: 0000000000000000
copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]
raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline]
_inline_copy_from_user include/linux/uaccess.h:178 [inline]
_copy_from_user+0x7a/0xb0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:212 [inline]
copy_from_bpfptr_offset include/linux/bpfptr.h:53 [inline]
copy_from_bpfptr+0x5c/0x90 include/linux/bpfptr.h:59
bpf_prog_load+0xa83/0x19e0 kernel/bpf/syscall.c:2992
__sys_bpf+0x507/0x860 kernel/bpf/syscall.c:6134
__do_sys_bpf kernel/bpf/syscall.c:6244 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6242 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6242
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd06958eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd06a42e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fd0697e5fa0 RCX: 00007fd06958eec9
RDX: 0000000000000094 RSI: 00002000000000c0 RDI: 0000000000000005
RBP: 00007fd069611f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd0697e6038 R14: 00007fd0697e5fa0 R15: 00007ffcf5bcab18
</TASK>
----------------
Code disassembly (best guess):
0: 35 04 00 66 2e xor $0x2e660004,%eax
5: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1)
c: 00
d: 0f 1f 00 nopl (%rax)
10: 48 8b 06 mov (%rsi),%rax
13: 48 89 07 mov %rax,(%rdi)
16: 48 83 c6 08 add $0x8,%rsi
1a: 48 83 c7 08 add $0x8,%rdi
1e: 83 e9 08 sub $0x8,%ecx
21: 74 db je 0xfffffffe
23: 83 f9 08 cmp $0x8,%ecx
26: 73 e8 jae 0x10
28: eb c5 jmp 0xffffffef
* 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction
2c: e9 4f 35 04 00 jmp 0x43580
31: 48 8b 06 mov (%rsi),%rax
34: 48 89 07 mov %rax,(%rdi)
37: 48 8d 47 08 lea 0x8(%rdi),%rax
3b: 48 83 e0 f8 and $0xfffffffffffffff8,%rax
3f: 48 rex.W
---
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.
prev parent reply other threads:[~2025-10-07 16:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-08 9:57 [syzbot] [perf?] WARNING in __perf_event_overflow (2) syzbot
2025-10-07 16:18 ` syzbot [this message]
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