Re: conntrack (possibly) hangs on our ARM CPU in case we delete 5k+ connections as fast as possible

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Peter Marczis <peter.marczis@xxxxxxxxxxxxxxxxxxxx> wrote:
> Hello developers,
> I'm seeking some help to debug and solve one of my issues.
> 
> We observed that if we create 30k connections, everything works as
> expected, but when we start to disconnect them,
> conntrack (well not confirmed yet fully) makes the kernel side busy,
> and looks like no scheduling happens.

What do you mean by 'disconnect'?  conntrack -F ?

My wild guss is you need to backport

commit d93c6258ee4255749c10012c50a31c08f4e9fb16
netfilter: conntrack: resched in nf_ct_iterate_cleanup

> The whole thing works as expected, the only problem it makes our
> processes and well everything on user side hanging for a couple of
> seconds 10-30s,
> which of course triggers our HW Watchdog, and we end up in a reboot.

You could try

CONFIG_LOCKUP_DETECTOR=y
CONFIG_HARDLOCKUP_DETECTOR=y

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