From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750835AbdE0R4Q (ORCPT ); Sat, 27 May 2017 13:56:16 -0400 Received: from bh-25.webhostbox.net ([208.91.199.152]:38769 "EHLO bh-25.webhostbox.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750732AbdE0R4P (ORCPT ); Sat, 27 May 2017 13:56:15 -0400 Date: Sat, 27 May 2017 10:56:12 -0700 From: Guenter Roeck To: Vegard Nossum Cc: Oleg Nesterov , Jamie Iles , Thomas Gleixner , linux-kernel@vger.kernel.org Subject: mips qemu test failures in -next due to "kthread: Fix use-after-free if kthread fork fails" Message-ID: <20170527175612.GA22714@roeck-us.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.24 (2015-08-30) X-Authenticated_sender: guenter@roeck-us.net X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - bh-25.webhostbox.net X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - roeck-us.net X-Get-Message-Sender-Via: bh-25.webhostbox.net: authenticated_id: guenter@roeck-us.net X-Authenticated-Sender: bh-25.webhostbox.net: guenter@roeck-us.net X-Source: X-Source-Args: X-Source-Dir: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, my qemu testis of mips images are failing in -next. Symptom is a hang during boot; see http://kerneltests.org/builders/qemu-mips-next for some examples. I bisected the problem in next-20170526. It points to commit 4d6501dce079c ("kthread: Fix use-after-free if kthread fork fails"). Reverting that patch fixes the problem. Bisect log is attached. Guenter --- # bad: [494a19b0aa3c905b6c5221f49058526896b06a23] Add linux-next specific files for 20170526 # good: [08332893e37af6ae779367e78e444f8f9571511d] Linux 4.12-rc2 git bisect start 'HEAD' 'v4.12-rc2' # good: [61f91dc3a7c15bdc06e746b0fa30a2b125bd41b6] Merge remote-tracking branch 'drm/drm-next' git bisect good 61f91dc3a7c15bdc06e746b0fa30a2b125bd41b6 # bad: [854cfdd6fc9298018f6625d5e495405b2687b13c] Merge remote-tracking branch 'tip/auto-latest' git bisect bad 854cfdd6fc9298018f6625d5e495405b2687b13c # good: [bb4b4365c7a19d593d190ec6a380a7835b20e3fc] Merge remote-tracking branch 'sound/for-next' git bisect good bb4b4365c7a19d593d190ec6a380a7835b20e3fc # good: [830aade0f6121bf1bfa6504aa588b23469694803] Merge remote-tracking branch 'battery/for-next' git bisect good 830aade0f6121bf1bfa6504aa588b23469694803 # bad: [0f90e8b13c713120ae0d2485533e5acf956f8321] Merge branch 'x86/boot' git bisect bad 0f90e8b13c713120ae0d2485533e5acf956f8321 # good: [d04e31a23c3c828456cb5613f391ce4ac4e5765f] cpufreq/pasemi: Adjust system_state check git bisect good d04e31a23c3c828456cb5613f391ce4ac4e5765f # bad: [a451941cac2792181be56857e70233cbb9957cd2] Merge branch 'perf/urgent' git bisect bad a451941cac2792181be56857e70233cbb9957cd2 # bad: [2c510368365cd0ce0c48c3f97a7048dc07ccd94a] Merge branch 'locking/urgent' git bisect bad 2c510368365cd0ce0c48c3f97a7048dc07ccd94a # good: [b9de5068b2d7c22de1bb89d62a7119a6b8dff88f] x86/ioapic: Remove unused IO_APIC_irq_trigger() function git bisect good b9de5068b2d7c22de1bb89d62a7119a6b8dff88f # bad: [79824ccf1691d0b8d4ef83d5d212ba0b31d8081e] Merge branch 'core/urgent' git bisect bad 79824ccf1691d0b8d4ef83d5d212ba0b31d8081e # bad: [4d6501dce079c1eb6bf0b1d8f528a5e81770109e] kthread: Fix use-after-free if kthread fork fails git bisect bad 4d6501dce079c1eb6bf0b1d8f528a5e81770109e # first bad commit: [4d6501dce079c1eb6bf0b1d8f528a5e81770109e] kthread: Fix use-after-free if kthread fork fails