lockdep warning: fs_reclaim_acquire vs tcp_sendpage

[Daniel Wagner]

On Wed, Oct 19, 2022 at 04:09:39PM +0300, Sagi Grimberg wrote:
> > 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.

> What is vm.min_free_kbytes (via sysctl)?

vm.min_free_kbytes = 67584