[roottest] test `roottest-root-io-evolution-fixarr2` fails on some Mac

[linev]

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Description

After #19012 will be merged,
large roottest/root/io/evolution test will be split on many small tests.
One of such tests roottest-root-io-evolution-fixarr2 crashes on some Mac platforms and therefore was disabled there.
Stack trace looks like:

 [/usr/lib/system/libsystem_platform.dylib] _sigtramp (no debug info)
  [/Users/sftnight/ROOT-CI/build/lib/libRIO.so] TFile::Close(char const*) /Users/sftnight/ROOT-CI/src/io/io/src/TFile.cxx:1036
  [/Users/sftnight/ROOT-CI/build/lib/libRIO.so] TFile::~TFile() /Users/sftnight/ROOT-CI/src/io/io/src/TFile.cxx:580
  [/Users/sftnight/ROOT-CI/build/lib/libRIO.so] TFile::~TFile() /Users/sftnight/ROOT-CI/src/io/io/src/TFile.cxx:569
  [/Users/sftnight/ROOT-CI/build/roottest/root/io/evolution/fixarr2_C.so] read(char const*) (no debug info)

Reproducer

One need to remove if(NOT APPLE) from cmake file and then:

ctest -R roottest-root-io-evolution-fixarr2

ROOT version

master

Installation method

build from source

Operating system

Mac

Additional context

No response

[dpiparo]

@linev I cannot reproduce: what mac platform exactly?

[linev]

I saw failure on Mac15 platform. See here:
https://github.com/root-project/root/actions/runs/15714091698/job/44279370611?pr=19012#step:6:8703

But first PR must be merged, only then fixarr2 will appear - but not on Mac.

This test was never executed with Makefiles.

[linev]

And on my mac it crashes in 10% of runs

[dpiparo]

It's great we have this increased coverage. Thanks for that. We need the fix to be one commit of the PR that enables the test, right?

[linev]

For the moment test is disabled like:

if(NOT APPLE)
  ROOTTEST_ADD_TEST(fixarr2
                    MACRO fixarr2.C+
                    OUTREF fixarr2.ref
                    LABELS longtest io
                    FIXTURES_REQUIRED root-io-evolution-fixarr2-fixture root-io-evolution-fixarrfile-fixture)
endif()

If solution will be found - one can easily re-enable it with same PR