On Thu, 2007-11-01 at 19:26 -0400, Michael Wu wrote: > On Thursday 01 November 2007 15:17:16 Luis R. Rodriguez wrote: > > mcgrof@pogo:~/devel/wireless-2.6$ git-describe > > v2.6.24-rc1-146-g2280253 > > > > So I hit segfault with lockdep on count_matching_names() on the > > strcmp() multiple times now. This is reproducible and with different > > wireless drivers. > > > I've found the problem. It appears to be in lockdep. struct lock_class has a > const char *name field which points to a statically allocated string that > comes from the code which uses the lock. If that code/string is in a module > and gets unloaded, the pointer in |name| is no longer valid. Next time this > field is dereferenced (count_matching_names, in this case), we crash. > > The following patch fixes the issue but there's probably a better way. Thanks, and indeed. From my understanding lockdep_free_key_range() should destroy all classes of a module on module unload. So I'm not quite sure what has gone wrong here.. - To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
