Vakul Garg <vakul.g...@nxp.com> wrote: > > > 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'? > > > > Yes, when policy is destroyed and the last user calls > > xfrm_pol_put() which will invoke call_rcu to free the structure. > > It seems that policy reference count never gets decremented during packet > ipsec encap. > It is getting incremented for every frame that hits the policy. > In setkey -DP output, I see refcnt to be wrapping around after '0'.
Thats a bug. Does this affect 4.14 only or does this happen on current tree as well?
