>>> After the above, it's no longer crashing, and my email client's "pending
>>> operations" have
>>> cleared.
>>
>> Does your server use ECC memory and if so, are there any errors logged
>> (bitflip, ...)?
>>
>> Best regards,
>> Gerald
>
> I don't have the logs from that time them nor do I see any hardware / memory
> errors.
>
> I also haven't had any other odd failures.
>
> But how can I tell if I have ECC memory or not?
You could install dmidecode and search for ECC (not L1/L2 cpu cache), e.g.
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: Multi-bit ECC
Maximum Capacity: 128 GB
Error Information Handle: 0x0008
Number Of Devices: 4
It happens rarely but without ECC those errors often go without notice.
With ECC dmesg/kernel log might show warnings like
kernel: [Hardware Error]: Unified Memory Controller Ext. Error Code: 0, DRAM
ECC error.
kernel: EDAC MC0: 1 CE Cannot decode normalized address on mc#0csrow#2channel#1
...
kernel: [Hardware Error]: cache level: L3/GEN, tx: GEN, mem-tx: RD
kernel: core: [Hardware Error]: Machine check events logged
kernel: [Hardware Error]: Corrected error, no action required.
Best regards,
Gerald
