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 F258A7FBA2 for ; Sun, 5 Oct 2025 04:26:28 +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=1759638390; cv=none; b=mrZWAH4IQKylP6gk4wG1qFmXB0h0uAdc+ayBZAMgvQlBqsmOLOKWS1Lqqi8q0QapTL6qQf8C+6sxGqQEeGXzY52CRb5TqRhkTknewteYZGij3hF8BRYgg2OhjlznnHDwUHvkOCdvX1bPsB2ViNxzGekneHgYgptnD3aFCkD1f20= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759638390; c=relaxed/simple; bh=bEVwJUPinqPdCfKqSomN9iBpPONckYSTSRa9V7qwvnI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=JcbYRvgBUTjW3IQZ4bPEFTRhkvRPL956xpKVpz83ciRl3vgKE/xVHxnAPExk74qCng2zaPHl+gar06b2csEymMLTdXbBl2aqHovYFxtbkmUAPbtd00s6Y5VcH1kXkIXWjYBfB5p++LXqDU59Iqqq1z5NX1Vaxzfixg2SxUocHIg= 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-42f6c3feed8so3404025ab.0 for ; Sat, 04 Oct 2025 21:26:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1759638388; x=1760243188; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=uL0vNEmJw+4LB7Q3FpsP4QzGIadNWrpy9p1/JLh4FK8=; b=nmiEAMBcCKNMvmAHpcxGgNQ374OGljw0oD1yP6EAFIh5CjQgyQWLYgOMneeXpd6o3o dHxju91my7BYakHs5dg9vXStW4Q/e8EyT9ljvITBvHiALifkty2FM/tj3yl6YJXa6ycS vjSJlgnFoZz8qbZw21WEMLVSUb3UucXlbcG5qO6pd/USOKoxb92paXbdqyPuPkaMkW+j fhP4O3x6GCXc99tF5nzvE0QOyaar+p4zfSAvqLCKkDMcwtzO/Vh9p0NvvwfGnGuQ/O1y GdZfrzvnHIjX7ECHpSsDEcMtpLHX+ILBvLnoXQxa7umnLo7e/MBw0sWLn/gkC9/yXD4R H3vg== X-Forwarded-Encrypted: i=1; AJvYcCWg07k4Kz50pyoGduNtJlFtUeiPoz+600RCA3tTrLJbcXRrRceP3O7m7dtXxaXVF03HjOh7RFdwliqn7gY=@vger.kernel.org X-Gm-Message-State: AOJu0YwHmvwSFcItok6/CPXAdvEr5J+5gy/hNPb6Dp+M/htNW/GtfIrp ojIbU143F3Oecdi9ypBBDFQoXCSiRt5PvnYIyqnwoQwd0YMJykp14hU6e2IeIsi7yHCqK7u062w 1Awi+KwA9HDSPQceJdrlVKoO7LPrAcsW+elw+9GLEsH4dtof50EC2UkB6zUY= X-Google-Smtp-Source: AGHT+IGPvbeckVVCtyYzmDwA7gwjCKzyLe+4IWGjam7H5qCdm/6AruTf74YkqoNNjRF2LgmF6yRHb2ozuiT4SPh8ionCqNqLFlMa Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:2293:b0:426:9b42:24c6 with SMTP id e9e14a558f8ab-42e7ad18eeemr113924715ab.10.1759638388051; Sat, 04 Oct 2025 21:26:28 -0700 (PDT) Date: Sat, 04 Oct 2025 21:26:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68e1f374.050a0220.2c17c1.0034.GAE@google.com> Subject: [syzbot] [usb?] KASAN: vmalloc-out-of-bounds Read in kcov_remote_start From: syzbot To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: d104e3d17f7b Merge tag 'cxl-for-6.18' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1146b942580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ccc18dddafa95b97 dashboard link: https://syzkaller.appspot.com/bug?extid=8a173e13208949931dc7 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/335d7c35cbbe/disk-d104e3d1.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/72dbd901415b/vmlinux-d104e3d1.xz kernel image: https://storage.googleapis.com/syzbot-assets/3ff1353d0870/bzImage-d104e3d1.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8a173e13208949931dc7@syzkaller.appspotmail.com ================================================================== BUG: KASAN: vmalloc-out-of-bounds in __list_del_entry_valid_or_report+0xb5/0x190 lib/list_debug.c:65 Read of size 8 at addr ffffc9000d912008 by task kworker/1:5/5918 CPU: 1 UID: 0 PID: 5918 Comm: kworker/1:5 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Workqueue: usb_hub_wq hub_event Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 __list_del_entry_valid_or_report+0xb5/0x190 lib/list_debug.c:65 __list_del_entry_valid include/linux/list.h:132 [inline] __list_del_entry include/linux/list.h:223 [inline] list_del include/linux/list.h:237 [inline] kcov_remote_area_get kernel/kcov.c:143 [inline] kcov_remote_start+0x2b0/0x6f0 kernel/kcov.c:906 kcov_remote_start_usb include/linux/kcov.h:55 [inline] hub_event+0x158/0x4a20 drivers/usb/core/hub.c:5888 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to a vmalloc virtual mapping Memory state around the buggy address: ffffc9000d911f00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc9000d911f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 >ffffc9000d912000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc9000d912080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc9000d912100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ================================================================== --- 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