botan: MacOS 10.15: system RNG test crashes

MacOS Catalina 10.15.3, Xcode-11.3.1, current Botan master.

Builds OK, but fails RSA tests:

. . . . .
rsa_kem:
RSA/KDF1-18033(SHA-1) KEM ran 6 tests in 23.70 msec all ok
RSA/KDF1-18033(SHA-256) KEM ran 6 tests in 38.40 msec all ok
RSA/KDF1-18033(SHA-512) KEM ran 3 tests in 20.54 msec all ok
RSA/KDF2(SHA-1) KEM ran 6 tests in 28.22 msec all ok
RSA/KDF2(SHA-256) KEM ran 6 tests in 35.69 msec all ok
RSA/KDF2(SHA-512) KEM ran 3 tests in 19.77 msec all ok
rsa_keygen:
Abort trap: 6

Here’s the crash data:

Thread 4 Crashed:
0   libsystem_kernel.dylib        	0x00007fff657767fa __pthread_kill + 10
1   libsystem_pthread.dylib       	0x00007fff65833bc1 pthread_kill + 432
2   libsystem_c.dylib             	0x00007fff656fda1c abort + 120
3   libcorecrypto.dylib           	0x00007fff6546dd78 cc_abort + 9
4   libcorecrypto.dylib           	0x00007fff65496cdb cc_try_abort + 9
5   libcorecrypto.dylib           	0x00007fff6542792c ccrng_cryptographic_generate + 538
6   botan-test                    	0x0000000105690175 Botan_Tests::(anonymous namespace)::System_RNG_Tests::run() + 1317
7   botan-test                    	0x00000001056a3c8d Botan_Tests::(anonymous namespace)::run_a_test(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) + 157
8   botan-test                    	0x00000001056a65b8 std::__1::__packaged_task_func<std::__1::__bind<Botan_Tests::Test_Runner::run_tests(std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > > const&, unsigned long, unsigned long, unsigned long)::$_1&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&>, std::__1::allocator<std::__1::__bind<Botan_Tests::Test_Runner::run_tests(std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > > const&, unsigned long, unsigned long, unsigned long)::$_1&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&> >, std::__1::vector<Botan_Tests::Test::Result, std::__1::allocator<Botan_Tests::Test::Result> > ()>::operator()() + 40
9   botan-test                    	0x00000001056a6072 std::__1::packaged_task<std::__1::vector<Botan_Tests::Test::Result, std::__1::allocator<Botan_Tests::Test::Result> > ()>::operator()() + 82
10  libbotan-2.13.dylib           	0x0000000105dfc606 Botan::Thread_Pool::worker_thread() + 550
11  libbotan-2.13.dylib           	0x0000000105dfce4e void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (Botan::Thread_Pool::*)(), Botan::Thread_Pool*> >(void*) + 62
12  libsystem_pthread.dylib       	0x00007fff65833e65 _pthread_start + 148
13  libsystem_pthread.dylib       	0x00007fff6582f83b thread_start + 15

Here’s the complete log: botan-test-fail.txt

Here’s how it was configured: conf-out.txt

The build output: make-out.txt

Tests: test-out.txt

Running tests in (what I think is) a single-thread mode points at a crash in system_rng test:

. . . . .
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib        	0x00007fff657767fa __pthread_kill + 10
1   libsystem_pthread.dylib       	0x00007fff65833bc1 pthread_kill + 432
2   libsystem_c.dylib             	0x00007fff656fda1c abort + 120
3   libcorecrypto.dylib           	0x00007fff6546dd78 cc_abort + 9
4   libcorecrypto.dylib           	0x00007fff65496cdb cc_try_abort + 9
5   libcorecrypto.dylib           	0x00007fff6542792c ccrng_cryptographic_generate + 538
6   botan-test                    	0x000000010c17b175 Botan_Tests::(anonymous namespace)::System_RNG_Tests::run() + 1317
7   botan-test                    	0x000000010c18ec8d Botan_Tests::(anonymous namespace)::run_a_test(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) + 157
8   botan-test                    	0x000000010c18cf6f Botan_Tests::Test_Runner::run_tests(std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > > const&, unsigned long, unsigned long, unsigned long) + 303
9   botan-test                    	0x000000010c18bf2a Botan_Tests::Test_Runner::run(Botan_Tests::Test_Options const&) + 6602
10  botan-test                    	0x000000010c02c225 main + 3765
11  libdyld.dylib                 	0x00007fff6562f7fd start + 1