From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f79.google.com (mail-ot1-f79.google.com [209.85.210.79]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 75262326931 for ; Thu, 8 Jan 2026 22:43:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767912206; cv=none; b=ceEpY2oPcbTJ+NzwPGG3H3enVvhOCG8LYQEP6l6dPcv1MkcSbH+Q8K1d/YPYXXDGQCXb4qEqLiP23jWaIJ7Mrc+1hvnJWIc3LOki8svP0nzruJwuIYiTB+BRtp0V9xK33eHAmhC4qCN/vgj75sHrXubNGuGcJ9ds04D90HbzjS0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767912206; c=relaxed/simple; bh=D4SiCcZnagi1n5ujXKNODjmWJFDN8mwFcgYlm5guZjk=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=pLKZ5rjLSGHgNPJZxy72KgxldG4nK1xVhX1+18btANHg5OdmQsJ+99Zhpl1QS+DQkYZnkIAl/2fWAE5k4P3h3r1YfMPWdOlMbGsVqrt7jKTjB+M7wn9joqNUlyDrqDenVHkFn0dABlsfIs0EHBVT9aKqilxi0eKqNHuSIuqrMcE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.210.79 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f79.google.com with SMTP id 46e09a7af769-7c70930bdf4so812627a34.2 for ; Thu, 08 Jan 2026 14:43:24 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767912203; x=1768517003; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=9TiEK9HPqCMHBDhTZnOlClVfYIrH5v0N+vhwn/LE/jA=; b=uzjDroQG1sIGKQ+aJAX0ZeXNR9o2LfWCTININqups1+FrAtfg8WcdhvhH7d003ApP9 m0bmZSEPMjtfvHROWNf0YE+zz72lRNSatZYGoYxKPIEfTkENOmrt4hMvHMdL9B9dNPlw TjpQAVr83uRMbcx7kMB6XOmUIbvIoRS4eQNwpd/WSBZO25CgtTxld/MMpZuZ+vi1oaDQ BOf6UjEY7GC5uHCHA3SMkLcr51m8lF2o516+ODAAwFE0embQ3VaAU5KMpLx16PAUrOXa y7SgRbaT6rEJ9GGi/jjiS/J6910JwNi1Cz5qUdgPtJUSTAPh4JxhBqKnn0moLHBs9uZl fnxw== X-Forwarded-Encrypted: i=1; AJvYcCWwXvg4nDgqU2nArlMottw8ptnvcmCYEXY+u/rp1fDjK5P6qWrgXQiB48AT84rlheh4Q8Q5Ug4=@vger.kernel.org X-Gm-Message-State: AOJu0Yz45KVGv4mYHr0It469PT5PQo1Y1C5WbP/h1FuIa8Y7lgdimR6N kaNKcvqLP5oepUVjA3i1e4fM3TKcFXGP3wMTlRgF8zzRr7nyjNXJ3aOx1or3Mwzgs3nDU3FlW/X BU9aRHZ9OsMkiqxTfIicPdQE5fYLQkSDsSH5Zis3E0Izzk8uxNsl3j8Xj+jg= X-Google-Smtp-Source: AGHT+IE8xjXTGeRVle2y1n9kyRhHQ27tNqGnF+vOObwYB1W2n6IDOLJRU7eiCCGS9BqZQrPHgusDY97H9CLlxWdaDI/Zw6baX5hM Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:60b:b0:65f:bad:789c with SMTP id 006d021491bc7-65f54f670d5mr3384227eaf.58.1767912203538; Thu, 08 Jan 2026 14:43:23 -0800 (PST) Date: Thu, 08 Jan 2026 14:43:23 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6960330b.050a0220.1c677c.03a9.GAE@google.com> Subject: [syzbot] [wireguard?] WARNING in stub_timer From: syzbot To: Jason@zx2c4.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com, wireguard@lists.zx2c4.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 54e82e93ca93 Merge tag 'core_urgent_for_v6.19_rc4' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1022ee22580000 kernel config: https://syzkaller.appspot.com/x/.config?x=513255d80ab78f2b dashboard link: https://syzkaller.appspot.com/bug?extid=19e796f043fe3be7b76a compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-54e82e93.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f3befb5f53a4/vmlinux-54e82e93.xz kernel image: https://storage.googleapis.com/syzbot-assets/92820ca1dbd8/bzImage-54e82e93.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+19e796f043fe3be7b76a@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: kernel/time/timer.c:716 at stub_timer+0xa/0x20 kernel/time/timer.c:716, CPU#0: kworker/0:1/10 Modules linked in: CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: events_power_efficient wg_ratelimiter_gc_entries RIP: 0010:stub_timer+0xa/0x20 kernel/time/timer.c:716 Code: 0f 94 c0 5b 41 5e e9 05 73 b0 09 cc 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa e8 27 fa 12 00 90 <0f> 0b 90 c3 cc cc cc cc cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 RSP: 0018:ffffc90000007c98 EFLAGS: 00010246 RAX: ffffffff81ae0d39 RBX: 0000000000000101 RCX: ffff88801bef0000 RDX: 0000000000000100 RSI: ffffffff8bc095c0 RDI: ffffc9000db0f1c0 RBP: ffffc90000007d90 R08: ffffffff8f824677 R09: 1ffffffff1f048ce R10: dffffc0000000000 R11: ffffffff81ae0d30 R12: 0000000000000000 R13: ffffc9000db0f1c0 R14: 1ffff92000000f98 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff88808d414000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2cc5528910 CR3: 00000000377e7000 CR4: 0000000000352ef0 Call Trace: call_timer_fn+0x16e/0x590 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2404 handle_softirqs+0x22b/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x60/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_release+0x2d8/0x3b0 kernel/locking/lockdep.c:5893 Code: e4 e2 10 00 00 00 00 eb b5 e8 84 7f bd 09 f7 c3 00 02 00 00 74 b9 65 48 8b 05 74 9e e2 10 48 3b 44 24 28 75 44 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 59 5e c0 09 cc 48 8d 3d 11 6d e7 RSP: 0018:ffffc900001c79e0 EFLAGS: 00000282 RAX: f62d7e25cf48d100 RBX: 0000000000000283 RCX: 0000000080000001 RDX: 0000000000000002 RSI: ffffffff8d97c93e RDI: ffffffff8bc095e0 RBP: ffff88801bef0b80 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000038f34 R12: 0000000000000002 R13: 0000000000000002 R14: ffffffff8ea6eef8 R15: ffff88801bef0000 __raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline] _raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] wg_ratelimiter_gc_entries+0x384/0x450 drivers/net/wireguard/ratelimiter.c:76 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 ---------------- Code disassembly (best guess): 0: e4 e2 in $0xe2,%al 2: 10 00 adc %al,(%rax) 4: 00 00 add %al,(%rax) 6: 00 eb add %ch,%bl 8: b5 e8 mov $0xe8,%ch a: 84 7f bd test %bh,-0x43(%rdi) d: 09 f7 or %esi,%edi f: c3 ret 10: 00 02 add %al,(%rdx) 12: 00 00 add %al,(%rax) 14: 74 b9 je 0xffffffcf 16: 65 48 8b 05 74 9e e2 mov %gs:0x10e29e74(%rip),%rax # 0x10e29e92 1d: 10 1e: 48 3b 44 24 28 cmp 0x28(%rsp),%rax 23: 75 44 jne 0x69 25: fb sti 26: 48 83 c4 30 add $0x30,%rsp * 2a: 5b pop %rbx <-- trapping instruction 2b: 41 5c pop %r12 2d: 41 5d pop %r13 2f: 41 5e pop %r14 31: 41 5f pop %r15 33: 5d pop %rbp 34: e9 59 5e c0 09 jmp 0x9c05e92 39: cc int3 3a: 48 rex.W 3b: 8d .byte 0x8d 3c: 3d .byte 0x3d 3d: 11 6d e7 adc %ebp,-0x19(%rbp) --- 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