Execute: ifconfig ice0 100.0.0.222/24 up ifconfig ice0.3260 create ifconfig ice0.3260 inet6 172:55::60/112 ifconfig ice0.3260 up ndp -P Result: panic: prefix 0xfffff8020aace100 has referencing addresses cpuid = 21 time = 1678972203 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe01ac1a0a50 vpanic() at vpanic+0x17f/frame 0xfffffe01ac1a0aa0 panic() at panic+0x43/frame 0xfffffe01ac1a0b00 nd6_prefix_del() at nd6_prefix_del+0x1e8/frame 0xfffffe01ac1a0b80 nd6_ioctl() at nd6_ioctl+0x548/frame 0xfffffe01ac1a0c00 ifioctl() at ifioctl+0x427/frame 0xfffffe01ac1a0cc0 kern_ioctl() at kern_ioctl+0x202/frame 0xfffffe01ac1a0d30 sys_ioctl() at sys_ioctl+0x126/frame 0xfffffe01ac1a0e00 amd64_syscall() at amd64_syscall+0x12e/frame 0xfffffe01ac1a0f30 fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe01ac1a0f30
This issue also affects 12.4-RELEASE, but 13.2-RC2 doesn't seem to be affected.
I suspect https://reviews.freebsd.org/D36312 can help.