Received: by 2002:a05:6a10:22f:0:0:0:0 with SMTP id 15csp1842387pxk; Sat, 26 Sep 2020 07:01:57 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyvxvQgLK3HLZGejspH8ijBWqvwbLz1q1pOq/Z6eYhU/gEbuIK1i4EWjJpIv2Fr7aeyVgZw X-Received: by 2002:a17:906:7fca:: with SMTP id r10mr7452167ejs.534.1601128917611; Sat, 26 Sep 2020 07:01:57 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1601128917; cv=none; d=google.com; s=arc-20160816; b=a9R5srQ3sYoYBLdWipIb6mXTkckW5nk8VmVq3gjyoHppMOrWwrohwBFj/f0LkfE7J1 QL7Zpmcpo5aHturnnfyWkQPd+wxSVFKlCXG1X9jeAJQnFqsehOxSWTYiU7NUQ280zvRL HyRJgtpk1r1lyl8sjw8IBN6B33uCcbvTroLTlyJllzQmTAbcKCEzTOLtgnp0+B4pNQJg T9LRx41P0sSgAYL2J23frS8cFRQ8kjlYMSBC0nEzzDGJawVy5CIAZIOCzyCvmFn/XGPN nH0tZ6qpBbKdr6uEIsYAbnl0SdpEqAIzqBneKSwE3up1gQZFM2hOWD3d+ZQUg9ZrQanK DxlQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:to:from:subject:message-id:in-reply-to:date :mime-version; bh=98+aEA9pvx2wg/3Mq+Ya25XYLOCXE6/GNWyXPqnMQmI=; b=aAUjx/J/Pc28Y/RQZy8l+IRrrLVTlVfD0kl8DjdNI9JapDp8pD7ob7ndrDVnPLZrIK XHuYw3kAK6xH9IWv1X1W+eeoT4ViL6PBWm3EtPA7qgJtwX2Y0z/PnubB8fzl7Y3c2UEh ZsU/LDJInKbqJxGwTcSwTV1cARM5O3JUTny8P/+IOXBEzgNX9D5zFefHcSaz0b5gNMvW nby5ECC4Ge8p3x26gxFduS+RO4zUAEd9UYSxG5HY8drvVa23uKYwj49gUxkIJN+lnoK3 BFS2cKXnEI8Ypjy1a2dvxXg/BRnBhs6n/tHUUk5FQ5cehY1tzDbVqIjqNn4qFmGPxwE6 d2Sg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id cf14si3912183ejb.441.2020.09.26.07.01.34; Sat, 26 Sep 2020 07:01:57 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729418AbgIZN5H (ORCPT + 99 others); Sat, 26 Sep 2020 09:57:07 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:49886 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729093AbgIZN5G (ORCPT ); Sat, 26 Sep 2020 09:57:06 -0400 Received: by mail-io1-f70.google.com with SMTP id k133so4039194iof.16 for ; Sat, 26 Sep 2020 06:57:06 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=98+aEA9pvx2wg/3Mq+Ya25XYLOCXE6/GNWyXPqnMQmI=; b=uMg0XvMjfq/g9keiFOnQqfpohGxLmpJmFUj5EBJbEgTpteTl+daypE6wGeOTl/un0i 9mDXBo8i0cCU0iY0j/TUaeL6FaPEQnyZbVxspoQN3W/a4XOfoT/TLfy2PMBzTIutFPYV 4xxuxKQk/LsznydfMdgqS1+WEQJk84kxuMUGyBmwHcgjq2q5mMXHWZtFIlGpo29JVlEA cgi+lGOD24bBP1KHidY1rX46a6ZsJq855lRvck7tTJ62KGJkyDGnHQjAxuleTBm4KolN VVqQVrXzpZXQoDh0OvgYWdPwiB5WbUwsPiuykQeZWA9YM/lNyDO6bKl8KOkB/2ILT1Ca GLfA== X-Gm-Message-State: AOAM532RN8O/31mfqSlqHeghRiDge3Yr+Gr7Xcmy4rIJvlXc26708EOZ rnAXUK9g+swF3N+Q4eWSMn1Jh1IYIrrx1D6iH/fqx8ju+LsG MIME-Version: 1.0 X-Received: by 2002:a92:3554:: with SMTP id c81mr4125160ila.265.1601128625954; Sat, 26 Sep 2020 06:57:05 -0700 (PDT) Date: Sat, 26 Sep 2020 06:57:05 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000fd66ac05b037ce27@google.com> Subject: Re: KASAN: use-after-free Read in io_wqe_worker From: syzbot To: axboe@kernel.dk, io-uring@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot has tested the proposed patch and the reproducer did not trigger any issue: Reported-and-tested-by: syzbot+9af99580130003da82b1@syzkaller.appspotmail.com Tested on: commit: 41d5f92f io-wq: fix worker refcount race git tree: git://git.kernel.dk/linux-block io_uring-5.9 kernel config: https://syzkaller.appspot.com/x/.config?x=d31db37354c30905 dashboard link: https://syzkaller.appspot.com/bug?extid=9af99580130003da82b1 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) Note: testing is done by a robot and is best-effort only.