The test "hangs" and times out on some arm64 machines. It actually works as expected, but the machine has 2016 children under /sys/devices/system/memory/, and the tests do a double loop over this, which is slow enough to hit the 120 s limit. Add a limit on the number of iterations. Another option would be to exclude "memory" subsystem. But we may have other subsystems which have the same problem in the future, so I think it'll be more robust to not try to limit the fix to a specific subsystem.
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