netdev - RE: Help needed - Kernel lockup while running ipsec

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Date:   Thu, 22 Aug 2019 10:23:31 +0000
From:   Vakul Garg <vakul.garg@....com>
To:     Florian Westphal <fw@...len.de>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: Help needed - Kernel lockup while running ipsec



> -----Original Message-----
> From: Florian Westphal <fw@...len.de>
> Sent: Wednesday, August 21, 2019 9:42 PM
> To: Vakul Garg <vakul.garg@....com>
> Cc: Florian Westphal <fw@...len.de>; netdev@...r.kernel.org
> Subject: Re: Help needed - Kernel lockup while running ipsec
> 
> Vakul Garg <vakul.garg@....com> wrote:
> > > Policy refcount is decreasing properly on 4.19.
> > > Same should be on the latest kernel too.
> >
> > On kernel-4.14, I find dst_release() is getting called through
> xfrm_output_one().
> > However since dst->__refcnt gets decremented to '1', the
> > call_rcu(&dst->rcu_head, dst_destroy_rcu) is not invoked.
> >
> > On kernel-4.19, dst->__refcnt gets decremented to '0', hence things
> > fall in place and
> > dst_destroy_rcu() eventually executes.
> >
> > Any further help/pointers for kernel-4.14 would be deeply appreciated.
> 
> Can you try getting rid of the pcpu dst cache?
> 
> I had a look at 4.14-stable and it at least lacks 2950278d2d04ff531.
> 
> I've attached an (untested) revert of the pcpu cache (its gone in 4.19 and
> onwards).
> 

This patch fixed the refcnt issue. Many thanks for your help.
Would you send this patch for inclusion into 4.14-stable?