On 05/10/2021 13:03, Torsten Luettgert via Exim-users wrote:
  the exim process prints "free(): invalid pointer".

That implies it will try to coredump, I think.  Can you
do whatever magic Arch needs for coredumps from suid programs,
compile a version with "-O0 -g"  (or -ggdb), get a coredump,
and get the stacktrace ("bt" in gdb)?   Then we have a change of guessing
what was being free()d.
--
Cheers,
  Jeremy

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