Description of problem:
During testing of PCP a possible glibc bug has been discovered. PCP is using valgrind for some tests. One of these tests failed with the following valgrind log:

> Conditional jump or move depends on uninitialised value(s)
> at 0x4040410: strcmp (strcmp.S:76)
> by 0x4017E1B: check_match (dl-lookup.c:88)
> by 0x4017E1B: do_lookup_x (dl-lookup.c:447)
> by 0x4BC707B: do_dlsym (in /usr/lib64/libc.so.6)
> by 0x4BC6B97: _dl_catch_exception (in /usr/lib64/libc.so.6)
> by 0x4BC6CA7: _dl_catch_error (in /usr/lib64/libc.so.6)
> by 0x4030D87: _rtld_catch_error (dl-error-skeleton.c:260)
> by 0x4BC7367: __libc_dlsym (in /usr/lib64/libc.so.6)
> by 0x4B9C09F: module_load (in /usr/lib64/libc.so.6)
> by 0x4B9C853: __nss_module_get_function (in /usr/lib64/libc.so.6)
> by 0x4B9934F: __nss_lookup (in /usr/lib64/libc.so.6)
> by 0x4B9AFB7: __nss_passwd_lookup2 (in /usr/lib64/libc.so.6)
> by 0x4B12F5B: getpwuid_r@@GLIBC_2.17 (in /usr/lib64/libc.so.6)
>

{ > <insert_a_suppression_name_here> > Memcheck:Cond > fun:strcmp > fun:check_match > fun:do_lookup_x > fun:do_dlsym > fun:_dl_catch_exception > fun:_dl_catch_error > fun:_rtld_catch_error > fun:__libc_dlsym > fun:module_load > fun:__nss_module_get_function > fun:__nss_lookup > fun:__nss_passwd_lookup2 > fun:getpwuid_r@@GLIBC_2.17 > }

Version-Release number of selected component (if applicable):
RHEL compose: RHEL-9.3.0-20230726.0
glibc: glibc-2.34-72.el9
valgrind: valgrind-3.21.0-7.el9
pcp: pcp-6.0.5-2.el9

How reproducible:
Seen on aarch64 and ppc64le architectures only.
I do not know how to directly reproduce this.
This issue appeared during automated testing of PCP and I was not successful to reproduce it manually.

Steps to Reproduce:
1. Unknown

Actual results:
A valdrind reports an issue in glibc.

Expected results:
No valgrind issues are reported.

Additional info: