netdev - Help needed - Kernel lockup while running ipsec

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Date:   Mon, 19 Aug 2019 12:55:42 +0000
From:   Vakul Garg <vakul.garg@....com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Help needed - Kernel lockup while running ipsec

Hi

With kernel 4.14.122, I am getting a kernel softlockup while running single static ipsec tunnel.
The problem reproduces mostly after running 8-10 hours of ipsec encap test (on my dual core arm board).

I found that in function xfrm_policy_lookup_bytype(), the policy in variable 'ret' shows refcnt=0 under problem situation.
This creates an infinite loop in  xfrm_policy_lookup_bytype() and hence the lockup.

Can some body please provide me pointers about 'refcnt'?
Is it legitimate for 'refcnt' to become '0'? Under what condition can it become '0'?

Regards
Vakul