From: Chris J Arges Date: Thu, 2 Apr 2026 22:23:16 +0000 (-0500) Subject: net: increase IP_TUNNEL_RECURSION_LIMIT to 5 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=77facb35227c421467cdb49268de433168c2dcef;p=thirdparty%2Fkernel%2Flinux.git net: increase IP_TUNNEL_RECURSION_LIMIT to 5 In configurations with multiple tunnel layers and MPLS lwtunnel routing, a single tunnel hop can increment the counter beyond this limit. This causes packets to be dropped with the "Dead loop on virtual device" message even when a routing loop doesn't exist. Increase IP_TUNNEL_RECURSION_LIMIT from 4 to 5 to handle this use-case. Fixes: 6f1a9140ecda ("net: add xmit recursion limit to tunnel xmit functions") Link: https://lore.kernel.org/netdev/88deb91b-ef1b-403c-8eeb-0f971f27e34f@redhat.com/ Signed-off-by: Chris J Arges Link: https://patch.msgid.link/20260402222401.3408368-1-carges@cloudflare.com Signed-off-by: Jakub Kicinski --- diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h index 1f577a4f8ce9..d708b66e55cd 100644 --- a/include/net/ip_tunnels.h +++ b/include/net/ip_tunnels.h @@ -32,7 +32,7 @@ * recursion involves route lookups and full IP output, consuming much * more stack per level, so a lower limit is needed. */ -#define IP_TUNNEL_RECURSION_LIMIT 4 +#define IP_TUNNEL_RECURSION_LIMIT 5 /* Keep error state on tunnel for 30 sec */ #define IPTUNNEL_ERR_TIMEO (30*HZ)