Segfault with GCC in Armbian [Solved].

[ejolson]

I have two 4GB Rock64 boards identically configured.  Each has

• The official 5V 3A power supply.
  
• The official heat sink.
  
• A 32GB SanDisk A1-class SD card.
  
• An Eluteng USB to SATA bridge.
  
• A Sandisk 240GB SSD.
  
• Armbian Focal Server installed for Rock64.
  
• A wired gigabit network connection to same switch.
  
• No monitor attached.
  

I'm trying to compile version 10.2 of gcc.  On one of them the full build completes without problem; on the other I get a segmentation fault or illegal instruction error at random places in the build.

I'm probably past the warranty period because these systems sat on a shelf for a long time after being received due to shelter-at-home rules related to the ongoing epidemic.  If it is possible to exchange the one with intermittent failures, I'd be delighted.  Otherwise, I'm looking for a way to reliably use it.

I would be happy with a solution that achieved reliable operation by

• disabling one of the four CPU cores.
  
• disabling up to 1GB of RAM.
  
• reducing clock speed by up to 20 percent.
  

So far I've tried disabling cores 1 and 3 and using only cores 0 and 2, but that didn't help.  I've tried reducing clock speed to 1GHz but that didn't help.  I've tried cooling with a fan (separately powered) and that didn't help.  Disabling cores 0 and 2 and using only cores 1 and 3 seems a little more promising and testing is still under way.

I haven't tried disabling memory and am not actually sure the way to do this.  Is there an option I can pass to Linux to tell it to ignore certain parts of RAM that might be defective?  What would the suitable memory ranges be for a Rock64 board?