[Bug 271604] ifconfig ix0.<vlan> create leads to crash

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 30 May 2023 13:31:03 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271604

--- Comment #4 from Kurt Jaeger <pi@FreeBSD.org> ---
I upgraded the box from 13.1 to 13.2 in the meantime, but the old kernel
is still around, so:

# lldb /boot/kernel.old/kernel -c /var/crash/vmcore.0

shows this:

(lldb) bt
* thread #1, name = '(pid 66461) ifconfig (crashed)'
  * frame #0: 0xffffffff80c1b91e kernel`doadump + 14
    frame #1: 0xffffffff80c1b75c kernel`kern_reboot + 1084
    frame #2: 0xffffffff80c1bbce kernel`vpanic + 462
    frame #3: 0xffffffff80c1b9d3 kernel`panic + 35
    frame #4: 0xffffffff810afdf5 kernel`trap_fatal + 901
    frame #5: 0xffffffff810afe4f kernel`trap_pfault + 79
    frame #6: 0xffffffff810875b8 kernel`alltraps_pushregs_no_rax + 110
    frame #7: 0xfffff80017617b80
    frame #8: 0xffffffff80d5e7a7 kernel`rib_add_route + 1015
    frame #9: 0xffffffff80d608d7 kernel`rib_handle_ifaddr_info + 183
    frame #10: 0xffffffff80e2c9d3 kernel`nd6_prefix_onlink + 595
    frame #11: 0xffffffff80e2c5e5 kernel`nd6_prelist_add + 661
    frame #12: 0xffffffff80e03db3 kernel`in6_control + 2835
    frame #13: 0xffffffff80d325dd kernel`ifioctl + 925
    frame #14: 0xffffffff80c8980b kernel`kern_ioctl + 571
    frame #15: 0xffffffff80c89511 kernel`sys_ioctl + 209
    frame #16: 0xffffffff810b06ec kernel`amd64_syscall + 268
    frame #17: 0xffffffff81087ecb kernel`fast_syscall_common + 216

I have no idea if this lldb-call works - so it might be a bit fishy.

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