WARNING - waited for 10s for CPU

[Mark_Huang]

I am using MemTest86 V8.3 Pro to verify our motherboard with DDR4 SODIMM 16GB.
The overall result has no any error.
However it happened so many WARNING messages as below on Test#7 and Test#9.
WARNING - waited for 10s for CPU #26 to finish (BSP test time = 50327ms)

Does anyone know What is the meaning of that warning?

Thanks for any inputs.

...
2019-01-01 03:49:17 - Running test #7 (Test 7 [Moving inversions, 32-bit pattern])
2019-01-01 03:49:17 - MtSupportRunAllTests - Setting random seed to 0x1357FAA6
2019-01-01 03:49:17 - MtSupportRunAllTests - Start time: 12664976 ms
2019-01-01 03:49:17 - ReadMemoryRanges - Available Pages = 12536846
2019-01-01 03:49:17 - MtSupportRunAllTests - Enabling memory cache for test
2019-01-01 03:49:17 - MtSupportRunAllTests - Enabling memory cache complete
2019-01-01 03:49:17 - Start memory range test (0x0 - 0xC20000000)
2019-01-01 03:49:17 - Pre-allocating memory ranges >=16MB first...
2019-01-01 03:49:17 - All memory ranges successfully locked
2019-01-01 03:51:18 - WARNING - waited for 10s for CPU #31 to finish (BSP test time = 42838ms)
2019-01-01 03:52:28 - WARNING - waited for 10s for CPU #30 to finish (BSP test time = 58070ms)
2019-01-01 03:52:28 - WARNING - waited for 10s for CPU #31 to finish (BSP test time = 58070ms)
...
2019-01-01 04:36:11 - Running test #9 (Test 9 [Modulo 20, ones & zeros])
2019-01-01 04:36:11 - MtSupportRunAllTests - Setting random seed to 0x5A55BC75
2019-01-01 04:36:11 - MtSupportRunAllTests - Start time: 15478494 ms
2019-01-01 04:36:11 - ReadMemoryRanges - Available Pages = 12536846
2019-01-01 04:36:11 - MtSupportRunAllTests - Enabling memory cache for test
2019-01-01 04:36:11 - MtSupportRunAllTests - Enabling memory cache complete
2019-01-01 04:36:11 - Start memory range test (0x0 - 0xC20000000)
2019-01-01 04:36:11 - Pre-allocating memory ranges >=16MB first...
2019-01-01 04:36:11 - All memory ranges successfully locked
2019-01-01 04:38:00 - WARNING - waited for 10s for CPU #16 to finish (BSP test time = 37332ms)
2019-01-01 04:38:00 - WARNING - waited for 10s for CPU #17 to finish (BSP test time = 37332ms)
2019-01-01 04:38:00 - WARNING - waited for 10s for CPU #18 to finish (BSP test time = 37332ms)
...

[David (PassMark)]

There are a lot of motherboard with firmware bugs in their UEFI BIOS that prevent mult-threading.

This warning is an indication that the firmware might be buggy.