Re: Strange bug, help needed

[Mike Hommey <mh@glandium.org>]

On Sun, Jun 22, 2008 at 03:21:38PM +0200, Mike Hommey wrote:
> Note that before reaching that point, I also found the reason of the
> segfault, though I don't understand why.
> 
> The assembly for the address where it crashes is:
>   0x00007f9d67339160 <ptmalloc_init+384>: cmpb   $0x4d,(%rax)
> 
> And %rax points to an address in the range where
> /usr/lib/xulrunner-1.9/libxul.so used to be mmap()ed. Except at the
> moment the segfault occurs, libxul.so is *not* mmap()ed, because it was
> dlclose()d: xulrunner-stub dlopen()s it on startup and dlclose()s it
> at the end of its main().
> 
> Why would ptmalloc_init() try to read memory in mmap()ed libxul.so ?

Also, note that if I remove the dlclose()ing of libxul.so, it stops
segfaulting.

Mike