[Bug libgomp/109634] Linking Imagick for PHP compiles fine but gives segfault caused by libgomp on runtime

[amonakov at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109634

Alexander Monakov  changed:

   What|Removed |Added

 CC||amonakov at gcc dot gnu.org

--- Comment #5 from Alexander Monakov  ---
I remember Glibc used to issue a readable diagnostic in that case ("cannot
allocate memory in static TLS block"). Worth reporting to Glibc if that part
regressed and the diagnostic is no longer available (at least I don't see it in
the linked Github issue).

What is actually happening here? Valgrind catches a null pointer dereference,
but where is that null coming from? Is the dynamic linker invoking constructors
with TLS pointer set to null, instead of aborting?

[Bug libgomp/109634] Linking Imagick for PHP compiles fine but gives segfault caused by libgomp on runtime

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109634

Jakub Jelinek  changed:

   What|Removed |Added

 Status|UNCONFIRMED |RESOLVED
 Resolution|--- |WONTFIX

--- Comment #4 from Jakub Jelinek  ---
As mentioned by Andrew, this is a user error.
libgomp can be only dlopened in threaded apps if there is still space in the
static TLS surplus, which unfortunately some versions of glibc use even for
normal TLS rather than just static TLS.
So, LD_PRELOAD=libgomp.so.1, or link the program with libgomp.so.1 rather than
just its libraries, or dlopen it before spawning threads.
This is how glibc behaves, and unless we want to slow down libgomp extremely,
there is nothing that can be done about it on the GCC side.

[Bug libgomp/109634] Linking Imagick for PHP compiles fine but gives segfault caused by libgomp on runtime

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109634

--- Comment #3 from Andrew Pinski  ---
https://gcc.gnu.org/pipermail/gcc/2015-February/216464.html

[Bug libgomp/109634] Linking Imagick for PHP compiles fine but gives segfault caused by libgomp on runtime

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109634

--- Comment #2 from Andrew Pinski  ---
Could be a glibc issue too.

[Bug libgomp/109634] Linking Imagick for PHP compiles fine but gives segfault caused by libgomp on runtime

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109634

Andrew Pinski  changed:

   What|Removed |Added

   See Also||https://github.com/Imagick/
   ||imagick/issues/609

--- Comment #1 from Andrew Pinski  ---
IIRC