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During the test there was a failure on one USB plug to send a packet and a failure to read on another.
It could be the system was overloaded at the time (given the number of USB plus and USB based serial ports attached to the system) so you could try running the USB test by itself (could also be the CPU had no resources to spare depending on the duty cycle of the CPU test).
The system seems to be close to running out of RAM after only a few minutes, despite the RAM test not actually testing a large amount ( System Memory Total: 7892MB, Test RAM allocated 20MB, Available: 86MB), so there seems to be something very memory hungry on the system, you could try running the tests individually to see if it's one in particular the seems to be triggering this.
(could also be the CPU had no resources to spare depending on the duty cycle of the CPU test). USB =50 PASS , May I ask a question ,cmdline_config.txt ,How to add cpu temperature
Our guess it that is a load / timing issue.
Maybe the CPU (or bus connecting to the USB host controller) doesn't have enough capacity to handle this many ports at the same time.
In the past we have also seen bugs in the USB host controller device drivers on Linux. So that might also be an issue.
Might require protocol analysis and Linux kernel debugging to get to the bottom of it.
I know it doesn't help much, but Linux and Unix have a long long history of not having sound working correctly.
Unusually due to missing or buggy device drivers.
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