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From:   Akemi Yagi <toracat@elrepo.org>
Date:   Mon, 9 Dec 2019 09:57:06 -0800
Message-ID: <CABA31DqGSycoE2hxk92NZ8qb47DqTR0+UGMQN_or1zpoGCg9fw@mail.gmail.com>
Subject: Re: [PATCH 0/2] pipe: Fixes [ver #2]
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Vincent Guittot <vincent.guittot@linaro.org>,
        DJ Delorie <dj@redhat.com>, David Sterba <dsterba@suse.cz>,
        David Howells <dhowells@redhat.com>,
        Eric Biggers <ebiggers@kernel.org>,
        Al Viro <viro@zeniv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@kernel.org>
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On Mon, Dec 9, 2019 at 9:49 AM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> [ Added DJ to the participants, since he seems to be the Fedora make
> maintainer - DJ, any chance that this absolutely horrid 'make' buf can
> be fixed in older versions too, not just rawhide? The bugfix is two
> and a half years old by now, and the bug looks real and very serious ]
(snip)
> But sadly, there's no way I can push that fair pipe wakeup thing as
> long as this horribly buggy version of make is widespread.
>
>                  Linus

In addition to the Fedora make-4.2.1-4.fc27 (1) mentioned by Linus,
RHEL 8 make-4.2.1-9.el8 (2) is affected. The patch applied to Fedora
make (3) has been confirmed to fix the issue in RHEL's make.

Those are the only real-world examples I know of. I have no idea how
widespread this thing is...

Akemi

(1) https://bugzilla.redhat.com/show_bug.cgi?id=1556839
(2) https://bugzilla.redhat.com/show_bug.cgi?id=1774790
(3) https://git.savannah.gnu.org/cgit/make.git/commit/?id=b552b05251980f693c729e251f93f5225b400714