A regression by JDK-8372863.

On AWS m1.small:

bin/java -XX:+ShowCPUFeatures --version
This machine's CPU features are: -XX:CPUFeatures=0x142000070bbdf,0x380
CPU features being used are: -XX:CPUFeatures=0x142000070bbdf,0x380
Re-exec of java with new environment variable: GLIBC_TUNABLES=:glibc.cpu.hwcaps=,-AVX_Fast_Unaligned_Load
This machine's CPU features are: -XX:CPUFeatures=0x142000070bbdf,0x380
CPU features being used are: -XX:CPUFeatures=0x142000070bbdf,0x380
openjdk 25-internal 2025-09-16
OpenJDK Runtime Environment (fastdebug build 25-internal-adhoc.azul.crac-git)
OpenJDK 64-Bit Server VM (fastdebug build 25-internal-adhoc.azul.crac-git, mixed mode, sharing)

That is a needless re-exec.