Description of problem:

$ GLIBC_TUNABLES=help valgrind -q --error-exitcode=99 env > /dev/null; echo $?
==2335629== Conditional jump or move depends on uninitialised value(s)
==2335629== at 0x4C3E068: strlen (vg_replace_strmem.c:494)
==2335629== by 0x4EB084C: vfprintf (in /usr/lib64/libc-2.28.so)
==2335629== by 0x4F841BF: __printf_chk (in /usr/lib64/libc-2.28.so)
==2335629== by 0x10A8CF: UnknownInlinedFun (stdio2.h:109)
==2335629== by 0x10A8CF: main (env.c:632)
==2335629==
99

Version-Release number of selected component (if applicable):

glibc-2.28-225.el8.x86_64

How reproducible:

Always under valgrind

Steps to Reproduce:

See above.

Actual results:

Warning on accessing GLIBC_TUNABLES environment variable

Expected results:

No warning

Additional info:

Already fixed upstream as https://sourceware.org/bugzilla/show_bug.cgi?id=28256