From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 531F8C0650F for ; Tue, 30 Jul 2019 18:44:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2905D20693 for ; Tue, 30 Jul 2019 18:44:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387875AbfG3SoB (ORCPT ); Tue, 30 Jul 2019 14:44:01 -0400 Received: from mail-io1-f72.google.com ([209.85.166.72]:36993 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387833AbfG3SoB (ORCPT ); Tue, 30 Jul 2019 14:44:01 -0400 Received: by mail-io1-f72.google.com with SMTP id v3so72443570ios.4 for ; Tue, 30 Jul 2019 11:44:01 -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=fmJowBjHOviryjb2uUOgQ9a1aEAnn80EMfZUz4dp24E=; b=IHwToVAakfcQ8PYShFmCqSj5um3a+NpKXjb20JS7VYKR7uE5i5TaQRI0ZZBomwwaM+ Bs1jrNAJbhgpREZYHs36c8SPNgrUxka/eC3a8xujE4xcnkt91xDS26vySnL1O+7loQT5 j+zSLpKOCIjUAS88RXJQyZ3hyjZUCTW/Gl54tIisfIobsE4RbuJmFBxQULlkKomUqxnL d5hsUgf+a9pfl/aXdFPEGFuFhb7W++RngDcsgsD/tmLctdCKq11L4NIWVVO7IdBvJM8y ncnNQu6Km7++m+RDbhBPUlxpXSfDqdCkZL51T0EqGzEJHWV+sGz0IWyf3oF9xo1twCks IpLA== X-Gm-Message-State: APjAAAWdc4wtsRk0J1BHM0zHxjEtePlNh4JpIblOEvhqbM9xiAy4qa2N 2Xn7jaVbNbfqxKxByHJW1Ttrb80/k+Ji1zwNI2c8ZlrEeuAZ X-Google-Smtp-Source: APXvYqzoNj4GkC6AvA/IixrfS8pKQM1y3yNNpmunmeiyXret+F6oMMDeESdIhA7JVKpU0ewJTz8RVY49EHSoE0rHng5ABCf8LyYm MIME-Version: 1.0 X-Received: by 2002:a5d:8c81:: with SMTP id g1mr43882953ion.239.1564512240868; Tue, 30 Jul 2019 11:44:00 -0700 (PDT) Date: Tue, 30 Jul 2019 11:44:00 -0700 In-Reply-To: <00000000000057102e058e722bba@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000005d23d0058eea64a6@google.com> Subject: Re: INFO: task hung in perf_event_free_task From: syzbot To: acme@kernel.org, acme@redhat.com, alexander.shishkin@linux.intel.com, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, eranian@google.com, jolsa@redhat.com, kafai@fb.com, linux-kernel@vger.kernel.org, mark.rutland@arm.com, mingo@kernel.org, mingo@redhat.com, namhyung@kernel.org, netdev@vger.kernel.org, peterz@infradead.org, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, torvalds@linux-foundation.org, vincent.weaver@maine.edu, yhs@fb.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org syzbot has bisected this bug to: commit 1cf8dfe8a661f0462925df943140e9f6d1ea5233 Author: Peter Zijlstra Date: Sat Jul 13 09:21:25 2019 +0000 perf/core: Fix race between close() and fork() bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1523f40c600000 start commit: c6dd78fc Merge branch 'x86-urgent-for-linus' of git://git... git tree: upstream final crash: https://syzkaller.appspot.com/x/report.txt?x=1723f40c600000 console output: https://syzkaller.appspot.com/x/log.txt?x=1323f40c600000 kernel config: https://syzkaller.appspot.com/x/.config?x=7937b718ddac333b dashboard link: https://syzkaller.appspot.com/bug?extid=7692cea7450c97fa2a0a syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17e888cc600000 Reported-by: syzbot+7692cea7450c97fa2a0a@syzkaller.appspotmail.com Fixes: 1cf8dfe8a661 ("perf/core: Fix race between close() and fork()") For information about bisection process see: https://goo.gl/tpsmEJ#bisection