On Thu, Oct 08, 2026 at 10:11:14PM -0700, Kees Cook wrote:
> On Thu, Oct 08, 2026 at 05:56:21PM -0700, Paul E. McKenney wrote:
> > Building a kernel on CentOS Stream 9 from next-20261007 and next-20261008
> > (and maybe others?) on an x86 or arm64 system results in a strange
> > build failure featuring:
> >
> > WARNING: Unable to reopen jobserver read-side pipe: FileNotFoundError(2,
> > 'No such file or directory')
>
> What are your make and python versions? (Oh, the answer is going to be
> "CentOS-patched make 4.3")
I get "GNU Make 4.3", so maybe I need to patch or upgrade or something?
And "Python 3.12.15+meta", so maybe I need to talk to people here. ;-)
> > The failing systems have a pigz command (which complains bitterly when
> > run without arguments), and the immune system does not. On the failing
> > systems, "pigz --version" gives me "pigz 2.5".
> >
> > Do I need a specific version of pigz? Does this commit need a
> > version-number check? Are my systems pigz-intolerant? ;-)
> >
> > Less flippantly, is this a known problem? If not, what debugging
> > information can I provide?
>
> Having pigz just means the parallelism logic kicks in, so I'm suspecting
> something in scripts/jobserver-exec. That would point to something
> specific to python or make.
>
> I haven't seen this reported before, no.
>
> Ah, and before I could even finish writing this email, my ever helpful
> LLM has reported: "pre-4.4 make (like CentOS's 4.3) closes jobserver
> pipe descriptors in non-recursive recipes but still exports
> --jobserver-auth=R,W via MAKEFLAGS, whereas 4.4+ uses a named FIFO
> instead, explaining why it doesn't appear here." And has further found
> that this is CentOS-specific, since they appear to have incorrectly
> backported a patch ("make-4.3-cloexec.patch"), as stock make 4.3 doesn't
> have this problem.
>
> I'll go figure out if there is some proper way to work around CentOS's
> broken make...
>
> (And given this, I would suspect you can't do a '-j...' build of the
> "htmldocs" target either?)
I will install sphinx &c and give it a try. ;-)
Thanx, Paul
