[Libusb-devel] SIGSEGV under Mandrake 8.2

[Seagull <se...@ar...>]

I have now had two reports of core dumps under Mandrake 8.2 (both with
2.4.18 kernels): one for my Pocket Concert library, and the other for my
Nomad Jukebox library.  Both libraries use a common code base for USB device
discovery, and both are dying in the same spot.  The libipc SIGSEGV is
captured here:

   Program received signal SIGSEGV, Segmentation fault.
   ipc_discover (ipcs=0xbffef310, n=0xbffef30c) at base.c:29
   29             if ( device->descriptor.idVendor == IPC_VENDOR_ID &&

   (gdb) p device
   $4 = (struct usb_device *) 0x1031
   (gdb) p device->descriptor
   Cannot access memory at address 0x2041
   (gdb)

Now, the code at this point looks like this:

        usb_init();

        if ( usb_find_busses() ) return -1;
        if ( usb_find_devices() ) return -1;

        bus= usb_busses;
        while ( bus != NULL ) {
                device= bus->devices;
                while ( device != NULL ) {
                        if ( device->descriptor.idVendor == IPC_VENDOR_ID &&
                                device->descriptor.idProduct ==
                                IPC_PRODUCT_ID ) {

                                ipcs->device= device;
                                ipcs->dev= NULL;
                                ipcs->lid= IPC_LOWID_1;
                                ipcs->hid= IPC_HIGHID_1;
                                ipcs++;
                                (*n)++;
                        }
                        device= device->next;
                }

                bus= bus->next;
        }


This segment works fine under RedHat 7.x and FreeBSD 4.x-RELEASE builds.
Only the two Mandrake users are reporting this problem.  One is using
libusb v0.1.6a, and claims that this used to work when he was running
Mandrake 8.1.

Have I done something incorrect in my code block that is getting tickled
under Mandrake, or might there be some larger, weirder forces at work?
I am trying to get a core dump on this, though I am not optimistic about it
telling me anything useful.


Cheers,
-+JLS

-- 
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