It looks like this currently applies only to Fedora Rawhide, their rolling-release experimental distro which uses bleeding-edge prerelease versions of glibc. Also, this crash [is Nightly-only]; other branches will return an error and glibc will fall back to `mprotect`. [night]: https://searchfox.org/mozilla-central/rev/fa11d06fd84c487cb0a135c08af796daa6a56e44/security/sandbox/linux/Sandbox.cpp#579-580
Bug 1950573 Comment 2 Edit History
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It looks like this currently applies only to Fedora Rawhide, their rolling-release experimental distro which uses bleeding-edge prerelease versions of glibc. Also, this crash [is Nightly-only][night]; other branches will return an error and glibc will fall back to `mprotect`. (Edit: fixed hyperlink) [night]: https://searchfox.org/mozilla-central/rev/fa11d06fd84c487cb0a135c08af796daa6a56e44/security/sandbox/linux/Sandbox.cpp#579-580