Help with new Windows 98 crash

[Po Lu]

Emacs 30 (with unexec) is crashing on Windows 98 again, this time during
GC.

I cannot find a version of GDB that reads DWARF generated by GCC 9,
but here is the backtrace from GDB 5, which cannot read the debug
information in emacs.exe:

  #0 0x011e5491
  #1 0x00a44b68
  #2 0x00160070
  #3 0x00343030

the backtrace stops here, after which GDB complains it cannot access
memory at address 0x30303030.

addr2line says the first address belongs to line 606 of w32heap.c.  The
rest are garbage.  Could it be that something is trying to free dumped
memory?

(and if anyone can find a copy of GDB that works on Windows 98 and can
read the debuginfo, that would be best.  Thanks in advance.)