From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.99]:41108 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728810AbeHOPUe (ORCPT ); Wed, 15 Aug 2018 11:20:34 -0400 MIME-Version: 1.0 From: Krzysztof Kozlowski Date: Wed, 15 Aug 2018 14:28:32 +0200 Message-ID: Subject: [BUG][BISECT] NFSv4 root failures after "fs/locks: allow a lock request to block other requests." To: NeilBrown , Jeff Layton Cc: Alexander Viro , "J. Bruce Fields" , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, "linux-samsung-soc@vger.kernel.org" Content-Type: text/plain; charset="UTF-8" Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Hi, Bisect pointed commit ce3147990450a68b3f549088b30f087742a08b5d ("fs/locks: allow a lock request to block other requests.") to failure boot of NFSv4 with root on several boards. Log is here: https://krzk.eu/#/builders/21/builds/836/steps/12/logs/serial0 With several errors: kernel BUG at ../fs/locks.c:336! Unable to handle kernel NULL pointer dereference at virtual address 00000004 Configuration: 1. exynos_defconfig 2. Arch ARM Linux 3. Boards: a. Odroid family (ARMv7, octa-core (Cortex-A7+A15), Exynos5422 SoC) b. Toradex Colibri VF50 (ARMv7, UP, Cortex-A5) 4. Systemd: v236, 238 5. All boards boot from TFTP with NFS root (NFSv4) On Colibri VF50 I got slightly different errors: [ 11.663204] Internal error: Oops - undefined instruction: 0 [#1] ARM [ 12.455273] Unable to handle kernel NULL pointer dereference at virtual address 00000004 and only with some specific GCC (v6.3) or with other conditions which I did not bisect yet. Maybe Colibri's failure is unrelated to that commit. Best regards, Krzysztof