Issue #9531 has been reported by Naohisa Goto.

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Backport #9531: please backport r34605
https://bugs.ruby-lang.org/issues/9531

* Author: Naohisa Goto
* Status: Open
* Priority: Normal
* Assignee: 
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r44938 篁ュolarisにて、以下の Failureが増えました。
r34605 をバックポートすれば消えると思います。

  34) Failure:
test_exception_in_rehash(TestHash) [/user3/gen-info/ngoto/testruby/daily/src/spa
rc64-cc12-svn193-45036/test/ruby/test_hash.rb:950]:
[ruby-core:58728] [Bug #9187].
<[true, ""]> expected but was
<[false,
 "/XXXX/test/ruby/memory_status.rb:11:in `=~': invalid byte sequence in US-ASCII (ArgumentError)\n\tfrom /XXXX/test/ruby/memory_status.rb:11:in `block in read_status'\n\tfrom /XXXX/test/ruby/memory_status.rb:10:in `foreach'\n\tfrom /XXXX/test/ruby/memory_status.rb:10:in `read_status'\n\tfrom /XXXX/test/ruby/memory_status.rb:15:in `<module:Memory>'\n\tfrom /XXXX/test/ruby/memory_status.rb:1:in `<top (required)>'\n\tfrom -:in `require'\n"]>.




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