On 6/29/21 2:28 PM, Krzysztof Kozlowski wrote:

On 29/06/2021 20:06, Krzysztof Kozlowski wrote:

quoted

Minor update - it's not only Azure's. AWS m5.8xlarge and m5.16xlarge (32
and 64 cores) fail similarly. I'll try later also QEMU machines with
different amount of CPUs.

Test on QEMU machine with 31 CPUs passes. With 32 CPUs - failure as
reported.

dmesg is empty - no error around this.

Maybe something with per-cpu variables?

Ah yeah, so since you are further into this than I am, want to give my recent 
batch of fixes a try?

https://github.com/josefbacik/linux/tree/delalloc-shrink

This might actually resolve the problems.  If not I'm getting one of our 64cpu 
boxes setup to test this, I also couldn't reproduce it on my smaller local 
machines.  Thanks,

Josef