[3.0.1] serial_vs_parallel_padmm crashes

[olebole]

Again the same run as #282 and #283, serial_vs_parallel_padmm crashes (Signal 11) with

[poch:2533407] *** Process received signal ***
[poch:2533407] Signal: Segmentation fault (11)
[poch:2533407] Signal code:  (-6)
[poch:2533407] Failing at address: 0x4d20026a81f
[poch:2533407] [ 0] /lib/x86_64-linux-gnu/libpthread.so.0(+0x14110)[0x7f52bfb56110]
[poch:2533407] [ 1] /build/purify-3.0.1/obj-x86_64-linux-gnu/cpp/tests/test_serial_vs_parallel_padmm(_ZN6spdlog7details14full_formatter6formatERKNS0_7log_msgERK2tmRN3fmt2v619basic_memory_bufferIcLm250ESaIcEEE+0x46e)[0x5654a29d235e]
[poch:2533407] [ 2] /build/purify-3.0.1/obj-x86_64-linux-gnu/cpp/tests/test_serial_vs_parallel_padmm(_ZN6spdlog5sinks16stdout_sink_baseINS_7details13console_mutexEE3logERKNS2_7log_msgE+0x105)[0x5654a29fd425]
[poch:2533407] [ 3] /build/purify-3.0.1/obj-x86_64-linux-gnu/cpp/tests/test_serial_vs_parallel_padmm(_ZN6spdlog6logger8sink_it_ERKNS_7details7log_msgE+0x4c)[0x5654a299083c]
[poch:2533407] [ 4] /usr/lib/x86_64-linux-gnu/libsopt.so.3.0(_ZN4sopt8wavelets7factoryENSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEm+0x119c)[0x7f52c0039ccc]
[poch:2533407] [ 5] /build/purify-3.0.1/obj-x86_64-linux-gnu/cpp/tests/test_serial_vs_parallel_padmm(+0x42a61)[0x5654a2987a61]
[poch:2533407] [ 6] /build/purify-3.0.1/obj-x86_64-linux-gnu/cpp/tests/test_serial_vs_parallel_padmm(+0xaf0eb)[0x5654a29f40eb]
[poch:2533407] [ 7] /build/purify-3.0.1/obj-x86_64-linux-gnu/cpp/tests/test_serial_vs_parallel_padmm(+0x3d8a1)[0x5654a29828a1]
[poch:2533407] [ 8] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb)[0x7f52bf9a3e0b]
[poch:2533407] [ 9] /build/purify-3.0.1/obj-x86_64-linux-gnu/cpp/tests/test_serial_vs_parallel_padmm(+0x3dc8a)[0x5654a2982c8a]
[poch:2533407] *** End of error message ***

For the full message of the test, see the attached complete build log purify_3.0.1-1_amd64.build As seen from the log, the next one (mpi_algo_factory) was started but took more than an hour.