botan: Unit tests hangs when it comes to bigint_unit

Hi,

I’m maintaining the botan package for Arch Linux. My goal is to upgrade the botan package to 2.5.0. Botan builds fine, but there were issues with the unit test:

./botan-test completely freezes/hangs when it comes to bigint_unit.

This is with botan 2.5.0, on 64-bit Arch Linux, GCC 7.3.1.

Configure/build commands:

./configure.py --prefix=/usr
make

Test command:

./botan-test

Last 10 lines of the unittest output:

Base64 ran 64 tests in 0.08 msec all ok
bc_pad:
ESP ran 15 tests in 0.01 msec all ok
NoPadding ran 10 tests in 0.01 msec all ok
OneAndZeros ran 13 tests in 0.01 msec all ok
PKCS7 ran 12 tests in 0.01 msec all ok
X9.23 ran 13 tests in 0.01 msec all ok
bcrypt:
bcrypt ran 367 tests in 2.15 sec all ok
bigint_unit:

Then it just hangs. I waited an hour before stopping the process.

I ran the tests on two different systems, for good measure.

Thanks for developing and maintaining botan.

Cheers!