What is the recipe to reproduce the crash? I see no crash running
speeddreams-2.4.2 from rawhide on a fresh Fedora 42: click anywhere
in the window with 3 cars, Quit, confirm. Also works with valgrind.
It seems to me that many of the "???" return addresses probably are
on pages that have been unmapped. I have written a short tool (shared
library dynamically loaded into the process at debug time) that looks up
addresses in /proc/self/exe: https://bitwagon.com/findpage.c
Using findpage at the time of the SIGSEGV, then I believe that many of
the "???" addresses will be "not found" in the running page mappings.
If so, then sprinkle some breakpoints into the code, "(gdb) run" again
under the same gdb session to get the same mappings [not re-randomized]
and check the addresses that were "???" in the first "(gdb) run"
to see when their pages might have become unmapped.
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