I've tried a couple memory testers:
 - Userspace 'memtester', which passed overnight
 - Kernel's 'memtest' cmdline arg, which also passed earlyboot. Running 
stress-ng afterwards still reported errors.

Attached is the console log from the kernel 'memtest' run. Note that I
saw 3 ECCs here, the last 2 do appear to be in userspace addresses:

$ grep 'ECC error' console.log 
lundmark login: [13515.008197] Synchronous External Abort: synchronous parity 
or ECC error (0x86000018) at 0x0000aaabd45d5fff
[13516.695278] Synchronous External Abort: synchronous parity or ECC error 
(0x86000018) at 0x0000ffffa12d2e90
[13525.127804] Synchronous External Abort: synchronous parity or ECC error 
(0x86000018) at 0x0000ffff80007fc8

** Attachment added: "console.log"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749685/+attachment/5122740/+files/console.log

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https://bugs.launchpad.net/bugs/1749685

Title:
  Kernel panic on ThunderX

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