Bennet Fauber <ben...@umich.edu> added the comment:

One additional note on this.  Thanks to a colleague at USC who pointed out that 
this bug does not seem to get exercised if one does not include 
`--enable-shared` at configuration.

I confirmed this using the distributed Python-3.7.4.tgz file and `configure 
--prefix=/path/to/install`.  The `make test` then runs to completion with no 
errors.  Running `make distclean`, then rerunning with `configure 
--prefix=/path/to/install --enable-shared` will then exercise the bug, and the 
faulthandler test fails with a segfault.

Applying the patch file attached to this report and rebuilding leads to `make 
test` passing all tests, also.

If someone was trying to reproduce and did not configure shared libraries, then 
that would have failed to reproduce.

----------
nosy: +justbennet

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<https://bugs.python.org/issue21131>
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