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Message-ID: <20121006205804.GO254@brightrain.aerifal.cx>
Date: Sat, 6 Oct 2012 16:58:05 -0400
From: Rich Felker <dalias@...ifal.cx>
To: musl@...ts.openwall.com
Subject: Re: TLS (thread-local storage) support
On Sat, Oct 06, 2012 at 10:39:39PM +0200, Szabolcs Nagy wrote:
> * Szabolcs Nagy <nsz@...t70.net> [2012-10-06 16:33:01 +0200]:
> > should the attached code work with dlopen
> > when compiled as a dso?
> >
> > (i wanted to check if the alignments are ok after a dlopen,
> > but i can see how this usage may not be supported)
> >
> > it seems it dies here in the ctor
>
> a more minimal example:
>
> a.c:
> __thread int xx;
> int *p;
> __attribute__((constructor)) static void init(void)
> {
> p = &xx;
> }
>
> b.c:
> #include <dlfcn.h>
> void *h;
> int main()
> {
> h = dlopen("./a.so", RTLD_LAZY);
> }
>
> compiled as
> musl-gcc -shared -fPIC -g -o a.so a.c
> musl-gcc -g -o b b.c
>
> ../b segfaults in init at p=&xx
Very stupid issue, fixed by commit
92e1cd9b0ba9a8fa86e0346b121e159fb88f99bc:
http://git.musl-libc.org/cgit/musl/commit/?id=92e1cd9b0ba9a8fa86e0346b121e159fb88f99bc
Rich
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