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Date: Wed, 30 Sep 2020 11:55:47 -0400
From: Rich Felker <dalias@...c.org>
To: Jesse Hathaway <jesse@...ki-mvuki.org>
Cc: musl@...ts.openwall.com
Subject: Re: Re: Pending patches for MT-fork stuff

On Wed, Sep 30, 2020 at 09:46:12AM -0500, Jesse Hathaway wrote:
> On Tue, Sep 29, 2020 at 7:10 PM Rich Felker <dalias@...c.org> wrote:
> > Here is the offending code:
> >
> > https://github.com/golang/go/blob/a413908dd064de6e3ea5b8d95d707a532bd3f4c8/src/runtime/signal_unix.go#L866
> >
> > It should be calling sigfillset() (from libc) to get the starting
> > sigset_t rather than using its own all-one-bits initializer.
> >
> > There may be other places in the runtime where the same error is made.
> > It looks like blockableSig (line 1132) is intended to do something
> > here, but has hard-coded (somewhere else) glibc knowledge rather than
> > probing via (libc's) sigaddset whether the signal number is valid.
> > This might be a preferred point to fix it at.
> 
> Thanks Rich for diving in and investigating the problem on the Go runtime
> side. I am happy to open a bug report on the Go side, but I have a couple
> of questions. Would you instead prefer to open the report, since you have
> a much deeper understanding of the problem and what changes need to
> be made than I? However, if you would rather I create the report, are you
> okay with me quoting your analysis? Thanks, Jesse

Please go ahead with it to the extent that you can, quoting my
analysis where it's relevant, and if there's anything unclear I'll try
to follow up.

Rich

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