Date: Thu, 6 Oct 2011 20:52:22 GMT From: Alex Dupre <ale@FreeBSD.org> To: FreeBSD-gnats-submit@FreeBSD.org Subject: threads/161344: Failure to init TLS variables with func ptr inside shared lib Message-ID: <201110062052.p96KqMZJ004100@freefall.freebsd.org> Resent-Message-ID: <201110062100.p96L0IU8027084@freefall.freebsd.org>
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>Number: 161344
>Category: threads
>Synopsis: Failure to init TLS variables with func ptr inside shared lib
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-threads
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Oct 06 21:00:18 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator: Alex Dupre
>Release: FreeBSD 8.2-STABLE i386
>Organization:
>Environment:
System: FreeBSD freefall.freebsd.org 8.2-STABLE FreeBSD 8.2-STABLE #4 r220774: Mon Apr 18 13:56:14 UTC 2011 simon@freefall.freebsd.org:/usr/obj/usr/src/sys/FREEFALL i386
>Description:
Initialisation of Thread Local Storage variables to some values
which are function address doesn't work inside a shared library.
>How-To-Repeat:
t1.c:
int f(int x) {
return x;
}
struct s_t {
int (*func)(int);
};
struct s_t __thread x = { f };
Build it as:
cc -shared -o t1.so -fPIC t1.c
t2.c:
struct s_t {
int (*func)(int);
};
extern struct s_t __thread x;
int main(int argc, const char *argv[]) {
return (*x.func)(argc);
}
Build it as:
cc t2.c t1.so
export LD_LIBRARY_PATH=.
./a.out
Segmentation fault
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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