From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f207.google.com (mail-il1-f207.google.com [209.85.166.207]) (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 600602FAC17 for ; Wed, 17 Sep 2025 17:14:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758129270; cv=none; b=utCfNrz9kDDK3FkxaWqV1i5BfJzZc+qz5hD6+u81je5O0ws/RdpAhMp3FutBuxpxXWKk06uIL0HyEXVHPhvhGpAL4PPEh7rg1+CD6QnIbn2I6AXixo3DWU5h2Wx469Si1usmGciPz5gatV3qUiQ0zF3EzQD8Av8BXpPBicWjsNk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758129270; c=relaxed/simple; bh=8PLkdaWrDgMesaX4mEXVPgd+cvSRzXSOLhBmlB375FM=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=cgBeH/gQgWuOQT8DL+sJs2DgzxRr5gOF60jXsr2y2QYEgh0gQZebpF8gzTsKjbE2dKt31b1M5PkcqePDefxWTUhGCTr8jkN83+CLP/1N47qWxT6ekGy3woa4yk2emOGWVKkWeQvgC6Q5SUiByUXPLzscCJGwHxc/ekJ69L2Qs24= 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=209.85.166.207 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-f207.google.com with SMTP id e9e14a558f8ab-42404e7bc94so93058435ab.3 for ; Wed, 17 Sep 2025 10:14:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758129267; x=1758734067; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=JKOpGpOzHLGkWDPCobkz16a2M+/D5W5KB7XR68mNObk=; b=lW9pNvCFPSkfDJUcqc98bDgC6SWHN1FxcTZW6D10iJdrOFjTb55/fDVrCp6AoWziZt PViHMyktVwk/ZeHP4fdzGNBs3ikhh2P0ek46N4O04szg2v4fvtNToK2o+Pt/LvX76Ex1 l33YS7G5QkaUNp0RLJDzTf+9ZVDR/PTczRCcU3e9xfZtXPjRcdrUbiD9MjoU7wkOa1No WJI6IvU6KGREGBpu5zcnC44ZTqEdz4vWlXDmoqPHKkfYjnuQKK1so/VRuiYZ0QGjXaKm ZdYHXQvT0xXvKboPHJt0uhi+wQCwpMpMOo76p/a4QEQJogtGWSLQrrgKPmVy4p8W0PH+ +a+Q== X-Gm-Message-State: AOJu0YwyuOeZhFhgwbtpT0G01tlVfI0usjnD/lzX0l2N5xiccbHdm1vy EoFyCaQsiMwLapGKD9c1LfK7vZtggkMv1tX0cKuAQBQUAHxdRMRyRIwdr6WcqMgmvniKejUpOnJ 4fApuu4m/sZreE96kLUKFb97GpVqhc7GUgs3XeiWMbFrxNUwsZelQOEXVD7+UtQ== X-Google-Smtp-Source: AGHT+IGKZu3C4gvQELP0BkLbCJBZ2HTDqYSkiEbHOJtYSp5Epm5vnnVwlLaAZ23a70WFQVobt33bfcWqAs8qXjCaMCgp/x1bob1V Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a92:ca4d:0:b0:409:d91f:a48f with SMTP id e9e14a558f8ab-4241a54ab35mr37326615ab.22.1758129267497; Wed, 17 Sep 2025 10:14:27 -0700 (PDT) Date: Wed, 17 Sep 2025 10:14:27 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68caec73.050a0220.2ff435.0595.GAE@google.com> Subject: [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" Hello, syzbot found 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=149ec534580000 kernel config: https://syzkaller.appspot.com/x/.config?x=7dcbc33245a844f3 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 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7c34033bfd08/disk-ae2d2000.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5b001294bb15/vmlinux-ae2d2000.xz kernel image: https://storage.googleapis.com/syzbot-assets/83d50ef44860/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#1: syz.3.28/6112 Modules linked in: CPU: 1 UID: 0 PID: 6112 Comm: syz.3.28 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 47 f7 09 cc 0f 1f 80 00 00 00 00 90 RSP: 0018:ffffc9000b127a20 EFLAGS: 00010293 RAX: ffffffff818eed7a RBX: ffff8880563ff400 RCX: ffff88807e13bc80 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffffc9000b127af0 R08: ffff8880563ff477 R09: 1ffff1100ac7fe8e R10: dffffc0000000000 R11: ffffed100ac7fe8f R12: 1ffff92001624f4c R13: dffffc0000000000 R14: 0000000000000002 R15: dffffc0000000000 FS: 000055556f6ab500(0000) GS:ffff888125ae1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9324bff000 CR3: 0000000028336000 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 drivers/vhost/vhost.c:313 [inline] vhost_dev_stop+0x282/0x320 drivers/vhost/vhost.c:1178 vhost_vsock_dev_release+0x203/0x3f0 drivers/vhost/vsock.c:751 __fput+0x44c/0xa70 fs/file_table.c:468 task_work_run+0x1d4/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43 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: 0033:0x7f6e0278eba9 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:00007ffe017861a8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f6e029d7da0 RCX: 00007f6e0278eba9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f6e029d7da0 R08: 0000000000013868 R09: 0000001a0178649f R10: 00007f6e029d7cb0 R11: 0000000000000246 R12: 000000000001c379 R13: 00007f6e029d6090 R14: ffffffffffffffff R15: 00007ffe017862c0 --- 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