From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f70.google.com (mail-wm0-f70.google.com [74.125.82.70]) by kanga.kvack.org (Postfix) with ESMTP id 668586B0008 for ; Wed, 30 May 2018 04:02:14 -0400 (EDT) Received: by mail-wm0-f70.google.com with SMTP id e1-v6so12020419wma.3 for ; Wed, 30 May 2018 01:02:14 -0700 (PDT) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id u20-v6si3323339edl.251.2018.05.30.01.02.13 for (version=TLS1 cipher=AES128-SHA bits=128/128); Wed, 30 May 2018 01:02:13 -0700 (PDT) Date: Wed, 30 May 2018 10:02:12 +0200 From: Michal Hocko Subject: Re: [PATCH 2/2] fs, elf: drop MAP_FIXED usage from elf_map Message-ID: <20180530080212.GA27180@dhcp22.suse.cz> References: <20171129144219.22867-1-mhocko@kernel.org> <20171129144219.22867-3-mhocko@kernel.org> <93ce964b-e352-1905-c2b6-deedf2ea06f8@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Mike Kravetz Cc: Andrew Morton , linux-mm@kvack.org, LKML , libhugetlbfs@googlegroups.com On Tue 29-05-18 15:21:14, Mike Kravetz wrote: > Just a quick heads up. I noticed a change in libhugetlbfs testing starting > with v4.17-rc1. > > V4.16 libhugetlbfs test results > ********** TEST SUMMARY > * 2M > * 32-bit 64-bit > * Total testcases: 110 113 > * Skipped: 0 0 > * PASS: 105 111 > * FAIL: 0 0 > * Killed by signal: 4 1 > * Bad configuration: 1 1 > * Expected FAIL: 0 0 > * Unexpected PASS: 0 0 > * Test not present: 0 0 > * Strange test result: 0 0 > ********** > > v4.17-rc1 (and later) libhugetlbfs test results > ********** TEST SUMMARY > * 2M > * 32-bit 64-bit > * Total testcases: 110 113 > * Skipped: 0 0 > * PASS: 98 111 > * FAIL: 0 0 > * Killed by signal: 11 1 > * Bad configuration: 1 1 > * Expected FAIL: 0 0 > * Unexpected PASS: 0 0 > * Test not present: 0 0 > * Strange test result: 0 0 > ********** > > I traced the 7 additional (32-bit) killed by signal results to this > commit 4ed28639519c fs, elf: drop MAP_FIXED usage from elf_map. > > libhugetlbfs does unusual things and even provides custom linker scripts. > So, in hindsight this change in behavior does not seem too unexpected. I > JUST discovered this while running libhugetlbfs tests for an unrelated > issue/change and, will do some analysis to see exactly what is happening. I am definitely interested about further details. Are there any messages in the kernel log? -- Michal Hocko SUSE Labs