On 9/16/2015 6:27 AM, Idwer Vollering wrote:
2015-09-16 8:06 GMT+02:00 Matthew Grooms <mgro...@shrew.net>:

It looks like my screenshot got scrubbed. Here is my hopefully faithful
transcription ...

Fatal trap 9: general protection fault while in kernel mode
cpuid = 3; apic id = 03
instruction pointer = 0x20:0xffffffff80a01105
stack pointer           = 0x28:0xfffffe0092fe86f0
frame pointer         = 0x28:0xfffffe0092fe8740
code segment         = base 0x0, limit 0xfffff, type 0x1b
                                  = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags     = interrupt enabled, resume, IOPL = 0
current process      = 716 (ifconfig)
[thread pid 716 tid 100082 ]
Stopped at      __mtx_lock_flags+0x55:  movq    (%r13),%rax
db> bt
Tracing pid 716 tid 100082 td 0xffffff800512814d0
__mtx_lock_flags() at __mtx_lock_flags+0x55/frame 0xfffffe0092fe8740
ieee80211_free_node() at ieee80211_free_node()_0x38/frame 0xfffffe0092fe8780
ieee80211_node_vdetach() at ieee80211_node_vdetach()+0x2d/frame
0xfffffe0092fe87a0
ieee80211_vap_detach() at ieee80211_vap_detach()+0x35e/frame
0xfffffe0092fe87d0
urtwn_vap_delete() at urtwn_vap_delete()+0xe/frame 0xfffffe0092fe87f0
if_clone_destroyif() at if_clone_destroyif()+0x1aa/frame 0xfffffe0092fe8840
if_clone_destroy() at if_clone_destroy()0x8e/frame 0xfffffe0092fe8860
kern_ioctl() at kern_ioctl()+0x230/frame 0xfffffe0092fe88c0
sys_ioctl() at sys_ioctl()+0x153/frame 0xfffffe0092fe89a0
amd64_syscall() at amd64_syscall()+0x282/frame 0xfffffe0092fe8ab0
Xfast_syscall() at Xfast_syscall()+0xfb/frame 0xfffffe0092fe8ab0
-- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x8011e8c8a, rsp =
0x7fffffffe2f8, rbp = 0x7fffffffe310 --
db>
Assuming dumpdev="AUTO" is set in /etc/rc.conf, you should have
entered 'dump' at the db> blinker :)

The trap details are found in /var/crash/, run kgdb: "kgdb
/boot/kernel/kernel /var/crash/vmcore.last", then run 'bt' and 'up' at
its prompt.

That sounds super useful. I felt like I was fumbling around in the dark at the db prompt :)

Thanks again,

-Matthew
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