The real FTBFS reason is:

testIReadIWriteAll (test_io.TestIOSelf.testIReadIWriteAll) ... [ip-10-84-234-105:152676] *** Process received signal ***
[ip-10-84-234-105:152676] Signal: Segmentation fault (11) [ip-10-84-234-105:152676] Signal code: Address not mapped (1) [ip-10-84-234-105:152676] Failing at address: (nil)
[ip-10-84-234-105:152676] [ 0] /lib/x86_64-linux-gnu/libc.so.6(+0x3c510)[0x7f7a3a86f510]
[ip-10-84-234-105:152676] *** End of error message ***
Segmentation fault
make[1]: *** [debian/rules:91: override_dh_auto_test] Error 1

I've just tried to build this locally and it didn't crash.

--
WBR, wRAR

-----BEGIN PGP SIGNATURE-----

iQJhBAABCgBLFiEEolIP6gqGcKZh3YxVM2L3AxpJkuEFAmYDyNMtFIAAAAAAFQAP cGthLWFkZHJlc3NAZ251cGcub3Jnd3JhckBkZWJpYW4ub3JnAAoJEDNi9wMaSZLh 6Y4P/jbgl54M85j0hI/PF/BmRkMr8TDAMDAtFFrG+/NoMjXjMJzWNouQgFdkRGxc Hdv26fvA23qSj4MKqpRhV1oHZB59Era4XiPY3ChSwnTWA62mzbuBce3OKDrWDz81 ywqZgbah4YwOjDNaUM2kpKGwkxGNGTdnOOhKQ9R092AwELf3SEPoWSto3nGbJhsf ueeKD7TiIe7AK6YSX7YNlG20f6vvfufVmpxFLBaHnwnjMx0YCMpL/d6WDroxOkIz kUbQsh3TGDoK0XpRp/i0IgEycym3v51alQdj4sFA2ND+YzmaEmi+nAoaPJ+BNf+r Psv895hpm7hjmCThx0dQhTvtHODgbcj46cRS2vjqgwhsL9WgEQk3rW7D5BtO5sTV ZDN5OzYAEMGehloj3smSYnzZIVT2SxTSKiDbkqKuhO4jVDReOcBFJ7gC8zK9j+kz 4JxBYUamb5iCr/KnkEABumtDdCz06lbzb/havmfLIndXXm+YaEmSApJizFtcIxqq I2RNqplllbcsvqXnYjJchJmTNKSl1N5ZvEOEADbKIkl3hF0H9EiFKEUxI8+eszlj xGLX3gsnOb5LO9KHpPaCbt81VzVUfUtDirsbqmr5L+xCJtCCI0Bf35Carr7AxrvK 42Er8D5s+Kt9ZsWNY9PJ2qEfaCsKc9Qr1flg8HEKUCu9cKWN
=x5eG
-----END PGP SIGNATURE-----

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)