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zebra: debug logs to detect incorrect mac deletions

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A MAC entry cannot be deleted while a neigh is referencing it. It seems
there is some race condition where this may be happening. The log is
to help identify those cases.

Signed-off-by: Anuradha Karuppiah <anuradhak@cumulusnetworks.com>
This commit is contained in:
Anuradha Karuppiah 2020-05-26 06:49:56 -07:00 committed by Anuradha Karuppiah
parent 4f9bb78eca
commit 46bf266c1c
1 changed files with 8 additions and 0 deletions
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8
zebra/zebra_evpn_mac.c
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@ -1005,6 +1005,14 @@ int zebra_evpn_mac_del(zebra_evpn_t *zevpn, zebra_mac_t *mac)
mac->flags);
}
/* If the MAC is freed before the neigh we will end up
* with a stale pointer against the neigh
*/
if (!list_isempty(mac->neigh_list))
zlog_warn("%s: MAC %pEA flags 0x%x neigh list not empty %d",
__func__, &mac->macaddr, mac->flags,
listcount(mac->neigh_list));
/* force de-ref any ES entry linked to the MAC */
zebra_evpn_es_mac_deref_entry(mac);