The ldconfig command occasionally fails on a POWER9 system with an error:

# # ldconfig
ldconfig: /lib64/glibc-hwcaps/power10/libm.so.6: ISA level is too high (1768697652 > 1023)
# echo $?
1

If I read the code correctly, that ISA level comes from the auxcache, and it looks like the interpretation of the file has changed between glibc releases. The value is different after ldconfig has run succesfully (after deleting /var/cache/ldconfig/aux-cache). Maybe we have had this problem for a while and it's just due to chance that we haven't seen it. It's possible this is not ppc64le-specific, but we only see it there because of the POWER10 multilib.

This could impact RHEL 10 in-place upgrades, so it needs some investigation. So far I have seen it after running ldconfig from the 2.41 development version on a RHEL 9 system.