Build-time tests fail if machine has a single CPU

[sanvila]

Hello. While trying to build the Debian package for this project (version 5.6.71) on a virtual machine with 1 CPU, I noticed that the following tests fails:

=== RUN   TestOOB
    sess_test.go:1386: Max OOB size: 1360
    sess_test.go:1433: missing OOB echo for payload length 581
    sess_test.go:1433: missing OOB echo for payload length 582
[...]
    sess_test.go:1433: missing OOB echo for payload length 735
    sess_test.go:1433: missing OOB echo for payload length 736
    sess_test.go:1433: missing OOB echo for payload length 737
--- FAIL: TestOOB (1.79s)
=== RUN   TestOOB_OneSideHandler
    sess_test.go:1533: server missing OOB for payload length 335
    sess_test.go:1533: server missing OOB for payload length 383
    sess_test.go:1533: server missing OOB for payload length 384
[...]
    sess_test.go:1533: server missing OOB for payload length 612
    sess_test.go:1533: server missing OOB for payload length 613
    sess_test.go:1533: server missing OOB for payload length 614
--- FAIL: TestOOB_OneSideHandler (1.77s)

Does this mean that the program will not work ok on a machine with 1 CPU, or it is a bug in the tests?
(To reproduce, try configuring GRUB with GRUB_CMDLINE_LINUX="nr_cpus=1" and then rebooting).

[ I also noticed that the memory footprint has grown a lot, but I'll report that separately ]

Thanks.