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Results are weird, we never hit the "rogue workqueue" message in openqa whatever the settings unless we are in the functional group, but it fails in almost every case with ""BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 155s!" which I assume to be the same bug.
results: https://openqa.suse.de/tests/overview?distri=sle&version=15-SP5&build=66.1-smptest&groupid=456.

it is

• sporadic with 1 cpu 1G, machine=64bit
• sporadic with 1 cpu 1G, machine=64bit-smp
• happens always with 1 cpu, 2G, machine=64bit
• happens (almost) always with 1 cpu, 2G, machine=64bit-smp (weird that occurence is more with more ram om one CPU, bad luck?)
• happens always with 2 cpu, 2G, machine=64bit-smp
• happens always with 4 cpu, 2G, machine=64bit-smp
• happens always with 4cpu, 1G, machine=64bit-smp
• Never happens with 4 cpu, 4G, machine=64bit-smp
• Never happens with 1 cpu, 4G, machine=64bit

So:

• Never happens with 4G of ram.
• Always happens with 2G of ram or less, except on single core.
• Sporadic with 1G of ram on one single core, but happens always with more ram, but not sure that's relevant

Conclusion: probably the lack of ram is what provokes the bug, but there seem to be a small difference between one or more cores on low memory.