[smartmontools-support] OS hangs and COMRESET events: failing drive?

[Christian Franke]

Gruff Hacker wrote:
> On Tuesday, May 26, 2020, 01:43:56 PM EDT, Christian Franke wrote:
>
>> COMRESET is an OOB signal on the SATA interface used to reset the
>> device. The "... due to a COMRESET" counter is cleared on power on and
>> usually increases by 2 during each (warm-)boot due to COMRESETs from
>> BIOS and device driver.
>>
>> In the above case, the counter increased further because the device
>> driver decided to reset the device several times. Unfortunately this
>> provides no hint why the resets were issued.
> Thanks Christian.  It's helpful to know this.  Would be nice if Intel could update their driver to be more verbose.  I assume the driver has some additional knowledge about why it was resetting the device but that knowledge is hidden.

Note that at least some versions of the Intel RST driver reset all 
remaining devices if a device is hot (un)plugged.