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Date: Mon, 26 Oct 2020 17:11:26 -0300
From: Érico Nogueira <>
To: <>, <>
Subject: Re: Status report and MT fork

On Mon Oct 26, 2020 at 12:52 PM -03, Rich Felker wrote:
> On Mon, Oct 26, 2020 at 03:44:51PM -0300, Érico Nogueira wrote:
> > Re. the patches, I am now able to import an image into gscan2pdf (a Perl
> > GTK application) - though it required building Perl with a bigger thread
> > stack size. With musl 1.2.1 it simply hung on a futex syscall.
> Great to hear! Was it "working" in earlier musl though? The crash (as
> discussed on irc) was clearly a stack overflow but it seems odd that
> it would be newly introduced, unless it was just really borderline on
> fitting before.
> Rich

I hadn't tested with any musl version but 1.2.1. A quick test with
1.1.24 shows that it didn't hang then, but hit the same segfault if
using perl without a fixed thread stack size.

The only reason the segfault seemed new to me was because the program
had never reached past the hang in the futex syscall :)

I will see if I can find the time to write some programs to torture test
the impl further, assuming that would help.


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