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New NIPA installation had been reporting a few flaky tests. arp_ndisc_evict_nocarrier is most flaky of them all. I suspect that the flakiness is due to udev swapping the MAC addresses on the interfaces. Extend the message in arp_ndisc_evict_nocarrier to hint at this potential issue. Having the neigh get fail right after ping is rather unusual, unless udev changes the MAC addr causing a flush in the meantime. Link: https://patch.msgid.link/20251127194556.2409574-1-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>