From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) (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 8BC9915C158 for ; Thu, 18 Sep 2025 01:46:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758159992; cv=none; b=Nn3tR2Ev2LcQumLxEjefGqyFpg5ctN8N78VOR+0VWYUFrrEIMs4JmNgZ2YnBc3eTdzWnrAmwVEdNi/i7jFImGs7kADHpqd02hgDhbhOd78RWlPvXyutSrbNxTf82x/PXzS2ariO/AF1zzdKSCQvx4ML6w19yFGI0BMsJe3paxCA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758159992; c=relaxed/simple; bh=EcIm17rXLTyT6VggB8jdgilUv/GURJk+vhDCT+eHjtE=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=EfaOo/rDT/Og+3MSVV8skopqY2aAh44WlePCLlZxwYTNeYrD6iyUwotCT7702vOORBx3xmuDNJM1nbKJwBurPacWp59VFGC2lVkB8Ue1XyAxgoRsBnMG5ZCo7xl/RwWeImEdLEf0mnWgN8Q4oa9DHH5gKrU9kQKlE9BNmTCxSfQ= 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=209.85.166.208 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-il1-f208.google.com with SMTP id e9e14a558f8ab-42408b5749aso23421075ab.1 for ; Wed, 17 Sep 2025 18:46:30 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758159989; x=1758764789; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=h+zf4uv5RriG06k13quUnb48BuEdN08q1RtC6J5Rl/Q=; b=qMgOq7lFXbR6xmPSHThfnyqaOXEXO0DzS8uxoJw+9beS4NwKTF4qnVm1vtt0/FyAv8 5wZlfkR/T6IeISbRo5h1AnBQgiZycLrm23NRjrTwQOlWaRKsnQCvc0Ho3DU0+Lld2pgO XpuePBBqhj6C3c7DnsfCGPigixp0PxhTlWAzhpoCFXwXo24obAX0iyf0+bM79zam4Ykn HdCFet5qJglss9mGaoYWDFOj6qNcI4MYvKnCgjwGlXNsCHeU7rNoFB1WS2xpxVEeZ9qz FdNu9dj/UBoGA8puKrkmq7Hpdf+Csd+CTCcsulGRTGakRGkXO7kFgdknz4Sy4aCkhsBp qb6g== X-Gm-Message-State: AOJu0YwrTp8x/o+ZiU7CLKtcL1I+dTHDAJ16L8qfMFbvfklVgeSShPqm yoFRtrfQfPIzThQbGPG7PSvNKwBdt0UeurBKd7ivwsp/NVyz5p35EiOpEM1gQgA9f6QX+cLs8jj P6g31bi0BdhaNq7C5evQl8oPrFCvZzJ37ln96r07hkKbplPa/e6iE7zGK9bDHiQ== X-Google-Smtp-Source: AGHT+IFceJ1+o2gPB/SiAz4HbNXZXtPed2iLd3/IKy85zA3HuRbwALvEMdKIFAPybBnP27o5F+vfjOZyQ2bK0F2PId7RovZWfqKE Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:dc6:b0:3fa:9b12:9e3b with SMTP id e9e14a558f8ab-424414d520bmr22551605ab.5.1758159989697; Wed, 17 Sep 2025 18:46:29 -0700 (PDT) Date: Wed, 17 Sep 2025 18:46:29 -0700 In-Reply-To: <68caec73.050a0220.2ff435.0595.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68cb6475.050a0220.3c6139.0fab.GAE@google.com> Subject: Re: [syzbot] [kernel?] WARNING in __vhost_task_wake From: syzbot To: linux-kernel@vger.kernel.org, luto@kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: ae2d20002576 Add linux-next specific files for 20250917 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=11678f62580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d737cfaddae0058c dashboard link: https://syzkaller.appspot.com/bug?extid=a1a3cefd6148c781117c 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=1790ef62580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10242534580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/96197382e3c0/disk-ae2d2000.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/55a8a6ba3307/vmlinux-ae2d2000.xz kernel image: https://storage.googleapis.com/syzbot-assets/c1b4ed5d6e2c/bzImage-ae2d2000.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a1a3cefd6148c781117c@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: kernel/vhost_task.c:97 at __vhost_task_wake+0xbb/0xd0 kernel/vhost_task.c:97, CPU#0: syz.0.174/6507 Modules linked in: CPU: 0 UID: 0 PID: 6507 Comm: syz.0.174 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:__vhost_task_wake+0xbb/0xd0 kernel/vhost_task.c:97 Code: 38 00 74 08 48 89 df e8 93 81 95 00 48 8b 3b 5b 41 5e 41 5f e9 a6 45 01 00 e8 31 ef 30 00 90 0f 0b 90 eb 8b e8 26 ef 30 00 90 <0f> 0b 90 5b 41 5e 41 5f e9 18 c7 ff 09 cc 0f 1f 80 00 00 00 00 90 RSP: 0018:ffffc90003b7f680 EFLAGS: 00010293 RAX: ffffffff818f2d7a RBX: ffff888033c7c400 RCX: ffff88802bc85ac0 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffffc90003b7f750 R08: ffff888033c7c477 R09: 1ffff1100678f88e R10: dffffc0000000000 R11: ffffed100678f88f R12: 1ffff9200076fed8 R13: dffffc0000000000 R14: 0000000000000002 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88812579c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9942aa0f98 CR3: 0000000027bfc000 CR4: 00000000003526f0 Call Trace: vhost_worker_queue+0x194/0x260 drivers/vhost/vhost.c:253 __vhost_worker_flush+0x134/0x1e0 drivers/vhost/vhost.c:290 vhost_worker_flush drivers/vhost/vhost.c:303 [inline] vhost_dev_flush+0xb2/0x130 drivers/vhost/vhost.c:313 vhost_vsock_flush drivers/vhost/vsock.c:698 [inline] vhost_vsock_dev_release+0x1fb/0x3f0 drivers/vhost/vsock.c:750 __fput+0x44c/0xa70 fs/file_table.c:468 task_work_run+0x1d4/0x260 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x6b5/0x2300 kernel/exit.c:966 do_group_exit+0x21c/0x2d0 kernel/exit.c:1107 get_signal+0x1285/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9941b8eba9 Code: Unable to access opcode bytes at 0x7f9941b8eb7f. RSP: 002b:00007f9942aa10e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f9941dd5fa8 RCX: 00007f9941b8eba9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f9941dd5fa8 RBP: 00007f9941dd5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9941dd6038 R14: 00007ffd2989c130 R15: 00007ffd2989c218 --- 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.