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Sender: Ingo Molnar <mingo.kernel.org@gmail.com>
Date:   Thu, 3 Jun 2021 14:43:57 +0200
From:   Ingo Molnar <mingo@kernel.org>
To:     Masahiro Yamada <masahiroy@kernel.org>
Cc:     Michal Marek <michal.lkml@markovi.net>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: kbuild: Ctrl-C of parallel kernel build sometimes corrupts
 .o.cmd files permanently
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* Ingo Molnar <mingo@kernel.org> wrote:

> >   CC      security/keys/keyctl_pkey.o
> >   CC      kernel/sys.o
> >   CC      arch/x86/power/hibernate_64.o
> > ^Cmake[5]: *** Deleting file 'drivers/video/fbdev/core/fbcmap.o'  <---- Deleting
> > make[5]: *** [scripts/Makefile.build:272:
> > drivers/video/fbdev/core/fbmon.o] Interrupt
> > make[3]: *** [scripts/Makefile.build:272: security/selinux/nlmsgtab.o] Interrupt
> > make[2]: *** [scripts/Makefile.build:272: arch/x86/power/cpu.o] Interrupt
> > make[2]: *** [scripts/Makefile.build:272:
> 
> Interestingly I don't get *any* interruption messages at all:
> 
>   CC      drivers/dma/dw/acpi.o
>   CC      sound/pci/ice1712/ice1712.o
>   CC      drivers/char/ipmi/ipmi_watchdog.o
>   CC      fs/overlayfs/export.o
>   CC      fs/nls/nls_cp936.o
>   CC      drivers/char/ipmi/ipmi_poweroff.o
>  ^Ckepler:~/tip> 
> 
> The '^C' there - it just stops, make never prints anything for me.

Found something - seems to be related whether the build is going into a 
pipe or not.


I usually build this way (directly or via a script):

   make -j96 bzImage ARCH=x86 2>&1 | tee e

Ctrl-C interruption is not handled by kbuild in this case:

  CC      fs/jffs2/xattr_trusted.o
  CC      sound/firewire/motu/motu-transaction.o
  CC      sound/usb/clock.o
  ^Ckepler:~/tip> 

Immediate prompt - no cleanup sequence.

But if I do it without 'tee', I get the expected cleanup sequence by make:

  kepler:~/tip> make -j96 bzImage ARCH=x86 2>&1

  CC      fs/jffs2/acl.o
  CC      sound/pci/echoaudio/mona.o
  CC      fs/nls/nls_iso8859-9.o
  ^Cmake[2]: *** Deleting file 'drivers/reset/core.o'
    make[3]: *** Deleting file 'sound/pci/mixart/mixart.o'
    make[3]: *** Deleting file 'sound/pci/emu10k1/voice.o'
    make[2]: *** Deleting file 'fs/gfs2/aops.o'

Thanks,

	Ingo