On Mon, Sep 14, 2020 at 9:37 PM Ingo Molnar <mi...@kernel.org> wrote: > > > * Masahiro Yamada <masahi...@kernel.org> wrote: > > > On Thu, Aug 20, 2020 at 3:35 PM Ingo Molnar <mi...@kernel.org> wrote: > > > > > > On every kernel build that runs --syncconfig, there's an output of the > > > following line: > > > > > > scripts/kconfig/conf --syncconfig Kconfig > > > > > > This is the only non-platform build message the kbuild system emits that > > > isn't > > > prefixed by at least a space, or is a build warning. > > > > > > Run it under -s - if there's any problem it will emit messages anyway. > > > > > > With this change the following simple grep filter will show all build > > > warnings > > > and errors of a kernel build: > > > > > > make | grep -v '^ ' > > > > > > > > I do want to see something when syncconfig is invoked. > > > > I will apply this instead: > > https://patchwork.kernel.org/patch/11727445/ > > BTW., there's another, rather spurious bug I recently triggered in kbuild. > > Occasionally when I Ctrl-C a kernel build on a system with a lot of CPUs, > the .o.cmd file gets corrupted: > > mm/.pgtable-generic.o.cmd:5: *** unterminated call to function 'wildcard': > missing ')'. Stop. > make: *** [Makefile:1788: mm] Error 2 > make: *** Waiting for unfinished jobs.... > > The .o.cmd file is half-finished: > > $(wildcard include/config/shmem.h) \ > $(wildcard include/config/hugetlb/page.h) \ > $(wildcard include/config/zone/device.h) \ > $(wildcard include/config/dev/pagemap/ops.h) \ > $(wildcard include/config/device/private.h) \ > $(wildcard include/config/pci/p2pdma.h) \ > $(wildcard include/config/sparsemem.h) \ > $(wildcard include/config/sparsemem/vmemmap.h) \ > $(wildcard include/config/numa/balancing.h) \ > $(wildcard i > [premature EOF]
Hmm, previously fixdep was not robust against errors or interruption. So, I occasionally observed the same problem as you saw. I fixed it in 6f9ac9f4427ec0470ccffbf852cfaf326677cc21 Since then, I have not seen the broken .cmd file issue. I repeated 'make -j256' and Ctrl-C, but I could not reproduce it... If GNU Make was interrupted during the build rule of mm/pgtable-generic.o, GNU Make should automatically have deleted mm/pgtable-generic.o because partially updated (i.e. corrupted) files are the source of all the troubles. Isn't this the case for you? If I interrupt Kbuild, I see several Deleting file '.....' messages, like follows: CC fs/seq_file.o CC drivers/acpi/dock.o CC drivers/scsi/scsi_devinfo.o CC fs/xattr.o ^Cmake[1]: *** [scripts/Makefile.build:283: fs/seq_file.o] Interrupt make[2]: *** [scripts/Makefile.build:283: net/ipv6/af_inet6.o] Interrupt make[3]: *** [scripts/Makefile.build:283: drivers/net/phy/mdio-boardinfo.o] Interrupt make[4]: *** [scripts/Makefile.build:283: drivers/tty/serial/8250/8250_pnp.o] Interrupt make[2]: *** [scripts/Makefile.build:283: security/selinux/status.o] Interrupt make[2]: *** [scripts/Makefile.build:283: arch/x86/kernel/dumpstack.o] Interrupt make[2]: *** Deleting file 'drivers/acpi/resource.o' make[2]: *** [scripts/Makefile.build:500: drivers/net/phy] Interrupt make[2]: *** [scripts/Makefile.build:283: net/sched/act_api.o] Interrupt make[2]: *** [scripts/Makefile.build:283: drivers/scsi/scsi_devinfo.o] Interrupt make[1]: *** Deleting file 'arch/x86/pci/mmconfig_64.o' make[1]: *** [scripts/Makefile.build:500: net/ipv6] Interrupt make[2]: *** [scripts/Makefile.build:283: net/ethtool/wol.o] Interrupt make[1]: *** Deleting file 'arch/x86/pci/init.o' make[1]: *** [scripts/Makefile.build:283: arch/x86/pci/mmconfig_64.o] Interrupt make[2]: *** [scripts/Makefile.build:283: net/sunrpc/socklib.o] Interrupt make[1]: *** [scripts/Makefile.build:283: fs/xattr.o] Interrupt make[2]: *** [scripts/Makefile.build:283: sound/hda/hdac_sysfs.o] Interrupt make[2]: *** [scripts/Makefile.build:283: net/mac80211/main.o] Interrupt make[2]: *** [scripts/Makefile.build:283: drivers/input/input-mt.o] Interrupt make[2]: *** [scripts/Makefile.build:283: net/rfkill/core.o] Interrupt make[1]: *** [scripts/Makefile.build:283: lib/bug.o] Interrupt make: *** [Makefile:1792: lib] Interrupt make[2]: *** Deleting file 'drivers/rtc/systohc.o' > Instead of the regular rules that end in: > > $(wildcard include/config/memory/hotplug/sparse.h) \ > > mm/pgtable-generic.o: $(deps_mm/pgtable-generic.o) > > $(deps_mm/pgtable-generic.o): > [regular EOF] > > Manually removing the corrupted .o.cmd dot file solves the bug. > > There's no reproducer other than Ctrl-C-ing large build jobs a couple of > times. > > Thanks, > > Ingo -- Best Regards Masahiro Yamada
