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 6BCBF3EF0CF for ; Thu, 19 Mar 2026 17:27:21 +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=1773941246; cv=none; b=mva81N9FEioqFNEenJHmE0xltmt3f4aRLhKHrZf/pQuTugINNiDBVWGeOGDTnYGjz0YkgGLqWYVUVwsOTwCvYO7CQthVWGbrNATldUa66qiAB0+C027Oja9g8FEk8FHQpoiRqi8GofX4kj2zTz+YZMH8zaQhj5Rb22LWlB/VSl8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773941246; c=relaxed/simple; bh=mnhZAQ2WTA9U0Tz1dprJ+7Ue4IXMoLBP4eJmGkwYA0c=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=SneUPyRMjjChZLQGX6SVYtGGHdaNiHkg6w5V6PIXrjQW6ekTiiGrSZl1wPzv2bR3XOj+wtgqTz7F6JpNmgIfqD9p20M559JlDw1FrUg6w/BdxPuzH+jS0VTjOSeVs9dy5XeRmb1ifHT/MvlFJpVJZHm4EMW6bsw9FOay04e+7EQ= 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 46e09a7af769-7d73e009a3dso7258555a34.1 for ; Thu, 19 Mar 2026 10:27:21 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1773941240; x=1774546040; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=6PSG3ejNRrlnw9XOugg9Tq/1P/fmevmevXBXVs3hffk=; b=H4J8bBnEL9h9FYOKH25aSffnyiM52IBJ5LJnKYJoopUQJhVZhN4Uu/PxOcFPLAE2ZY t07rTln+TIZ1OU4HZ7DXArW6Y8XrJGucaoREOhANt/iAQU9vsrMwUHoTeP5POOOOc/Uz EJXw1bJAOpvALX5/btPHaOP92mivVleKB7EOh8E6ZqVlEjzFvpC7U1kp8cd5Rd/czuaT /wsmgyTBsEPHMV/av8MiQ2fYux7io2b2/0oCvXAfm+qPbSKkKkJgwFzBYXCWdWR7Qk6v AzI+M0IT4zMlK6BUrqFP/stgL63XCmGj8rfwdj9jSX9vZzefpBJ23dSCBOomhXwmf6rm wZag== X-Forwarded-Encrypted: i=1; AJvYcCVQaKcd8HlAl82uCql6LeKMTUHVgP6JhnO5kja4+y6pPpSi7rH2kvqk6jDIWasVydVbkn6wm2b5RrShyXw=@vger.kernel.org X-Gm-Message-State: AOJu0YzvST7Tj7BC3yK7CxVgsQ2XENoybUWvIfcR6mS+08mI40rFCaCI CCKqJHPq/SKEOdySEfHpaTJpk6imnfoVj/pD3g76GhcrtLyR+SulYnvooJ09t8f2G1TuTqt7sBs eSTmbGj+lGGkPHmR3cK0MpT+qRyUq+giPtPjViQl4Xjy2fLEx769i5SEiR9M= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2291:b0:672:7c0d:5607 with SMTP id 006d021491bc7-67c22ecae21mr230743eaf.26.1773941240062; Thu, 19 Mar 2026 10:27:20 -0700 (PDT) Date: Thu, 19 Mar 2026 10:27:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69bc31f8.050a0220.18f14c.0050.GAE@google.com> Subject: [syzbot] [wireguard?] KCSAN: data-race in wg_expired_retransmit_handshake / wg_packet_send_queued_handshake_initiation (4) 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: 5ee8dbf54602 Merge tag 'fsverity-for-linus' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=123477e6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6b32b22d8934c136 dashboard link: https://syzkaller.appspot.com/bug?extid=4ca9a7b9d61b76d0177c 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/dacfe44e33b2/disk-5ee8dbf5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/10e825a65a06/vmlinux-5ee8dbf5.xz kernel image: https://storage.googleapis.com/syzbot-assets/b2fe6914587d/bzImage-5ee8dbf5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4ca9a7b9d61b76d0177c@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in wg_expired_retransmit_handshake / wg_packet_send_queued_handshake_initiation read to 0xffff88810b667808 of 4 bytes by interrupt on cpu 0: wg_expired_retransmit_handshake+0x2a/0x160 drivers/net/wireguard/timers.c:46 call_timer_fn+0x3b/0x2a0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x426/0x620 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0x31/0x70 kernel/time/timer.c:2404 handle_softirqs+0xb9/0x2a0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x39/0xc0 kernel/softirq.c:723 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x74/0x80 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:62 arch_safe_halt arch/x86/kernel/process.c:766 [inline] default_idle+0x9/0x20 arch/x86/kernel/process.c:767 default_idle_call+0x3b/0x60 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:191 [inline] do_idle+0xcd/0x230 kernel/sched/idle.c:332 cpu_startup_entry+0x24/0x30 kernel/sched/idle.c:430 rest_init+0xee/0xf0 init/main.c:760 start_kernel+0x49a/0x4c0 init/main.c:1210 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310 x86_64_start_kernel+0xfc/0x100 arch/x86/kernel/head64.c:291 common_startup_64+0x13e/0x147 write to 0xffff88810b667808 of 4 bytes by interrupt on cpu 1: wg_packet_send_queued_handshake_initiation+0x32/0x180 drivers/net/wireguard/send.c:59 wg_expired_new_handshake+0x26/0x30 drivers/net/wireguard/timers.c:104 call_timer_fn+0x3b/0x2a0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x426/0x620 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0x31/0x70 kernel/time/timer.c:2404 handle_softirqs+0xb9/0x2a0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x39/0xc0 kernel/softirq.c:723 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x74/0x80 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:62 arch_safe_halt arch/x86/kernel/process.c:766 [inline] default_idle+0x9/0x20 arch/x86/kernel/process.c:767 default_idle_call+0x3b/0x60 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:191 [inline] do_idle+0xcd/0x230 kernel/sched/idle.c:332 cpu_startup_entry+0x24/0x30 kernel/sched/idle.c:430 start_secondary+0x95/0xa0 arch/x86/kernel/smpboot.c:312 common_startup_64+0x13e/0x147 value changed: 0x00000002 -> 0x00000003 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ================================================================== --- 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