lockdep warning: fs_reclaim_acquire vs tcp_sendpage

[Sagi Grimberg]

>>> Still able to trigger though I figured out how I am able to
>>> reproduce it:
>>>
>>>    VM 4M memory, 8 vCPUs
>>
>> thats small...
> 
> Just a test VM. But I think this is actually the key to reproduce the
> lockdep splat. The fio command is eating up a lot of ram (I guess any
> other memory hog would do the job as well) and forces the mm subsystem
> to use the swap.

Is that 4MB of memory? or 4GB?

> 
>> What is vm.min_free_kbytes (via sysctl)?
> 
> vm.min_free_kbytes = 67584