On 12/6/19 10:59 AM, Linus Torvalds wrote:
Hmm. I think I just saw this same bug with a plain kernel compile.
My "make -j32" suddenly came to a crawl, and seems to be entirely
single-threaded.
And that's almost certainly because the way 'make' handles load
distribution is with a network of pipes that has a token passed to the
sub-makes.
So there's most definitely something wrong with the new pipe rework.
Well, I can't _guarantee_ the pipes are the cause of this, but it does
smell like it.
Linus
We encountered what seems to be the same problem when building a kernel
under RHEL 8.
As it turned out, this was due to a bug in make (make-4.2.1-9.el8) and
a patch is available. Details are found in this Red Hat bugzilla report:
https://bugzilla.redhat.com/show_bug.cgi?id=1774790
Akemi
