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From: =?utf-8?q?=C3=89rico_Nogueira?= <ericonr@disroot.org>
To: <musl@lists.openwall.com>, <musl@lists.openwall.com>
Date: Mon, 26 Oct 2020 15:44:51 -0300
Message-Id: <C6N1MWEJ5TZY.3IC8PBOZH8K6U@mussels>
In-Reply-To: <20201026032943.GK534@brightrain.aerifal.cx>
Subject: Re: [musl] Status report and MT fork

On Sun Oct 25, 2020 at 8:29 PM -03, Rich Felker wrote:
> > +	for (i=3D0; i<qpos; i++) if (queue[i]->ctor_visitor->tid < 0) {
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> Invalid access as-is, should be queue[i]->ctor_visitor && ...
>
> > +		error("State of %s is inconsistent due to multithreaded fork\n",
> > +			queue[i]->name);
> > +		free(queue);
> > +		if (runtime) longjmp(*rtld_fail, 1);
> > +	}
> > =20
> >  	return queue;
> >  }
>
> Rich

As a warning, don't install the resulting libc.so on your system without
the above fix! It segfaulted even with simple applications here.

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.

Cheers,
=C3=89rico