Debugging crashes when backtrace is not useful

Eli Zaretskii via Gdb <[email protected]>
Newsgroups gmane.comp.gdb.devel
Message-ID <[email protected]> 
Hi,

An Emacs user on Windows reported frequent crashes, but when run from
GDB, the relevant thread shows backtrace of zero:

    (gdb) bt
    #0  0x0000000000000000 in ?? ()
    #1  0x0000000000000000 in ?? ()

What can be done to try to understand what code produces this, and
why?

TIA
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