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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@us.ibm.com>
IBM Linux Technology Center



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