Hoi,
Consider the following sequence:
DBGvpp# sh ver
vpp v26.10-rc0~125-g6ad56defd built by pim on summer at 2026-06-14T09:12:11
DBGvpp# bvi create
bvi0
DBGvpp# bvi delete bvi0
DBGvpp# loopback create
/home/pim/src/vpp/src/vlib/node.c:160 (vlib_node_add_next_with_slot)
assertion `slot == p[0]' fails
(abort)
It's because 'loop0' tries to re-use the deleted interface node from
bvi0. bvi0 has wired tx slot 0 to be l2-input (l2/l2_bvi.c:173), while
loop0 extends ethernet devices with drop on 0, ethernet-input on slot 1
and l2-input on slot 2 (ethernet/interface.c:857-865). Reuse between
these two in either direction will trip the assert.
PTAL https://gerrit.fd.io/r/c/vpp/+/46052 proposes to walk
deleted_hw_interface_nodes searching for a node of the same class.
groet,
Pim
--
Pim van Pelt
PBVP1-RIPE - https://ipng.ch/
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