From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e33.co.us.ibm.com ([32.97.110.151]:59314 "EHLO e33.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030677Ab2B2TFl (ORCPT ); Wed, 29 Feb 2012 14:05:41 -0500 Received: from /spool/local by e33.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 29 Feb 2012 12:05:39 -0700 Date: Wed, 29 Feb 2012 11:01:38 -0800 From: Nishanth Aravamudan Subject: `make dep' with clock skew detected loops forever Message-ID: <20120229190138.GG5136@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: linux-kbuild-owner@vger.kernel.org List-ID: To: Michal Marek Cc: LKML , linux-kbuild@vger.kernel.org Noticed something on a fresh FC16 based install on a test server in our lab. Autotest by default runs `make dep` and it seems the clock is pretty badly skewed on this server, resulting in an infinite loop of: 01:09:37 DEBUG| Running 'make dep' 01:09:38 DEBUG| [stderr] make: Warning: File `/usr/local/autotest/tmp/build/linux/arch/powerpc/Makefile' has modification time 112143 s in the future 01:09:38 DEBUG| [stderr] make[1]: Warning: File `/usr/local/autotest/tmp/build/linux/arch/powerpc/Makefile' has modification time 112143 s in the future 01:09:38 DEBUG| [stderr] make[2]: Warning: File `scripts/Makefile.host' has modification time 112143 s in the future 01:09:38 DEBUG| [stdout] HOSTCC scripts/basic/fixdep 01:09:38 DEBUG| [stderr] make[2]: warning: Clock skew detected. Your build may be incomplete. 01:09:38 DEBUG| [stderr] make[2]: Warning: File `scripts/Makefile.host' has modification time 112143 s in the future 01:09:38 DEBUG| [stdout] HOSTCC scripts/kconfig/conf.o 01:09:38 DEBUG| [stdout] SHIPPED scripts/kconfig/zconf.tab.c 01:09:38 DEBUG| [stdout] SHIPPED scripts/kconfig/zconf.lex.c 01:09:38 DEBUG| [stdout] SHIPPED scripts/kconfig/zconf.hash.c 01:09:39 DEBUG| [stdout] HOSTCC scripts/kconfig/zconf.tab.o 01:09:39 DEBUG| [stdout] HOSTLD scripts/kconfig/conf 01:09:39 DEBUG| [stdout] scripts/kconfig/conf --silentoldconfig Kconfig 01:09:39 DEBUG| [stderr] make[2]: warning: Clock skew detected. Your build may be incomplete. 01:09:39 DEBUG| [stderr] make[1]: warning: Clock skew detected. Your build may be incomplete. 01:09:39 DEBUG| [stderr] make: Warning: File `/usr/local/autotest/tmp/build/linux/arch/powerpc/Makefile' has modification time 112142 s in the future 01:09:39 DEBUG| [stderr] make[1]: Warning: File `/usr/local/autotest/tmp/build/linux/arch/powerpc/Makefile' has modification time 112142 s in the future 01:09:39 DEBUG| [stderr] make[2]: Warning: File `scripts/Makefile.host' has modification time 112142 s in the future 01:09:39 DEBUG| [stdout] HOSTCC scripts/basic/fixdep 01:09:40 DEBUG| [stderr] make[2]: warning: Clock skew detected. Your build may be incomplete. 01:09:40 DEBUG| [stderr] make[2]: Warning: File `scripts/Makefile.host' has modification time 112141 s in the future 01:09:40 DEBUG| [stdout] HOSTCC scripts/kconfig/conf.o 01:09:40 DEBUG| [stdout] SHIPPED scripts/kconfig/zconf.tab.c 01:09:40 DEBUG| [stdout] SHIPPED scripts/kconfig/zconf.lex.c 01:09:40 DEBUG| [stdout] SHIPPED scripts/kconfig/zconf.hash.c 01:09:40 DEBUG| [stdout] HOSTCC scripts/kconfig/zconf.tab.o 01:09:40 DEBUG| [stdout] HOSTLD scripts/kconfig/conf 01:09:40 DEBUG| [stdout] scripts/kconfig/conf --silentoldconfig Kconfig Anyone know why that happens? Obvious fixes are to either not run `make dep` or to install an NTP client, and I can do that, but figured I'd report the above. Thanks, Nish -- Nishanth Aravamudan IBM Linux Technology Center