netdev - Re: arping stuck with ENOBUFS in 4.19.150

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Message-ID: <20201026092710.467c96e0@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Mon, 26 Oct 2020 09:27:10 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Joakim Tjernlund <Joakim.Tjernlund@...inera.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: arping stuck with ENOBUFS in 4.19.150

On Mon, 26 Oct 2020 12:58:16 +0000 Joakim Tjernlund wrote:
> On Thu, 2020-10-22 at 17:19 +0200, Joakim Tjernlund wrote:
> > strace arping -q -c 1 -b -U  -I eth1 0.0.0.0
> > ...
> > sendto(3, "\0\1\10\0\6\4\0\1\0\6\234\v\6 \v\v\v\v\377\377\377\377\377\377\0\0\0\0", 28, 0, {sa_family=AF_PACKET, proto=0x806, if4, pkttype=PACKET_HOST, addr(6)={1, ffffffffffff},
> > 20) = -1 ENOBUFS (No buffer space available)
> > ....
> > and then arping loops.
> > 
> > in 4.19.127 it was:
> > sendto(3, "\0\1\10\0\6\4\0\1\0\6\234\5\271\362\n\322\212E\377\377\377\377\377\377\0\0\0\0", 28, 0, {sa_family=AF_PACKET, proto=0x806, if4, pkttype=PACKET_HOST, addr(6)={1,
> > ffffffffffff}, 20) = 28
> > 
> > Seems like something has changed the IP behaviour between now and then ?
> > eth1 is UP but not RUNNING and has an IP address.

Seems like nobody knows off the top of their heads.

Any chance you can try 5.10-rc1 ? Or 5.9 ?

Or some versions in between 4.19.127 and 4.19.150 to narrow down the
search?