Created attachment 154094 [details]
The test source.

The output of the attached test indicates that after about a minute of run the system doesn't call the SIGPROF handler anymore. The test works as expected on Linux.

How to reproduce:
$ gcc test.cc  # or clang test.cc
$ ./a.out

Actual output:
0
1
2
3
...
*0
*1
*2
*3
...

Expected output:
0
1
2
3
...
(with rare inclusions of the asterix-prefixed lines).