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Date:   Thu, 6 Jun 2019 13:07:29 -0400
From:   Jeremy Cline <>
To:     David Miller <>
Subject: Re: [PATCH net] neighbor: Reset gc_entries counter if new entry is
 released before insert


On Sat, May 04, 2019 at 12:41:00AM -0400, David Miller wrote:
> From: David Ahern <>
> Date: Wed,  1 May 2019 18:08:34 -0700
> > From: David Ahern <>
> > 
> > Ian and Alan both reported seeing overflows after upgrades to 5.x kernels:
> >   neighbour: arp_cache: neighbor table overflow!
> > 
> > Alan's mpls script helped get to the bottom of this bug. When a new entry
> > is created the gc_entries counter is bumped in neigh_alloc to check if a
> > new one is allowed to be created. ___neigh_create then searches for an
> > existing entry before inserting the just allocated one. If an entry
> > already exists, the new one is dropped in favor of the existing one. In
> > this case the cleanup path needs to drop the gc_entries counter. There
> > is no memory leak, only a counter leak.
> > 
> > Fixes: 58956317c8d ("neighbor: Improve garbage collection")
> > Reported-by: Ian Kumlien <>
> > Reported-by: Alan Maguire <>
> > Signed-off-by: David Ahern <>
> Applied and queued up for -stable.

Did this get lost in the shuffle? I see it in mainline, but I don't see
it in stable. Folks are encountering it with recent 5.1 kernels in


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