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Message-ID: <20120229190138.GG5136@linux.vnet.ibm.com> Date: Wed, 29 Feb 2012 11:01:38 -0800 From: Nishanth Aravamudan <nacc@...ux.vnet.ibm.com> To: Michal Marek <mmarek@...e.cz> Cc: LKML <linux-kernel@...r.kernel.org>, linux-kbuild@...r.kernel.org Subject: `make dep' with clock skew detected loops forever 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 <nacc@...ibm.com> IBM Linux Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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