[Bug 204789] New: Boot failure with more than 256G of memory

[Cameron Berkenpas]

Hello,

Unfortunately, this patch set has made things quite a bit worse for me. 
Appending mem=256G doesn't fix it either. in all cases, the system at 
least gets past early boot and then I will probably get a panic and 
eventual reboot, or occasionally it just locks up entirely.

Here's my very first attempt at booting the kernel where I didn't even 
get a panic:
https://pastebin.com/a3TVZcVB

Here's another attempt where I get a panic:
https://pastebin.com/QsJjyC2v

Finally here's an attempt with mem=256G:
https://pastebin.com/swgLYie9

I don't know that these results are substantially different from each 
other, but perhaps there's something helpful.

Sometimes (but not in any of the above), the host gets to the point that 
systemd starts up, but ultimately it seems I got the same stacktrace.

At one point, I ended up with a CPU guarded out, but it was simple to 
recover.

-Cameron

On 9/17/19 8:15 PM, Aneesh Kumar K.V wrote:
> On 9/13/19 10:58 PM, Cameron Berkenpas wrote:
>> Running against the kernel I built against 0034d395f89d and the 
>> problem is still there.
>>
>> However, running against the kernel I built against the previous 
>> commit, a35a3c6f6065, and the system boots.
>>
>> This being due to 0034d395f89d confirmed.
>
>
> https://lore.kernel.org/linuxppc-dev/20190917145702.9214-1-aneesh.kumar@linux.ibm.com 
>
>
> This series should help you.
>
> -aneesh
>