On Wed, Aug 14, 2013 at 04:05:48PM +0200, Hans de Goede wrote: > From: Daniel Berrange <berra...@redhat.com> > > Since libusb-0.1 did not have any init / exit function, code using the > libusb-0.1 API will not call libusb_exit. > > Now, libgphoto uses libusb and will dlopen() and dlclose() it. Unfortunately > since there is no way to ensure libusb_close() is called, when libgphoto > dlcloses the libusb.so library, the thread from libusbx.so will not be > stopped. So a thread will remain running, executing code from a memory > region that has now been freed. Crash-tastic results ensue. > > I don't see a good way to fix this from libusb or libusbx, given the need to > preserve the existing API of libusb. > > If, however, we link libusb.so using -znodelete, we will prevent it from > ever being unloaded, despite the dlclose() calls. This is not ideal, but > better than allowing it to be unloaded which is a guaranteed crash. > > Signed-off-by: Hans de Goede <hdego...@redhat.com>
Tested-by: Daniel P. Berange <berra...@redhat.com> This patch stopping my libgphoto/entangle application from crashing repeatedly. > --- > libusb/Makefile.am | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/libusb/Makefile.am b/libusb/Makefile.am > index 33a609a..a20fdb5 100644 > --- a/libusb/Makefile.am > +++ b/libusb/Makefile.am > @@ -5,5 +5,5 @@ libusb_la_SOURCES = core.c usbi.h > libusb_la_CFLAGS = -fvisibility=hidden $(AM_CFLAGS) $(LIBUSB_1_0_CFLAGS) > libusb_la_LIBADD = $(LIBUSB_1_0_LIBS) > libusb_la_LDFLAGS = -version-info $(LT_MAJOR):$(LT_REVISION):$(LT_AGE) \ > - -release 0.1 > + -release 0.1 -Wl,-z -Wl,nodelete Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :| ------------------------------------------------------------------------------ Get 100% visibility into Java/.NET code with AppDynamics Lite! It's a free troubleshooting tool designed for production. Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk _______________________________________________ libusbx-devel mailing list libusbx-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libusbx-devel
