ahd(4) reliable panic

[Sean Bruno]

ports building seems to be able to panic ahd(4) pretty reliably.


> db> whe
> Tracing pid 12 tid 100040 td 0xfffffe0015b53000
> ahd_freeze_devq() at ahd_freeze_devq+0x16/frame 0xffffff800039da60
> ahd_handle_seqint() at ahd_handle_seqint+0xf11/frame 0xffffff800039db00
> ahd_platform_intr() at ahd_platform_intr+0x242/frame 0xffffff800039db20
> intr_event_execute_handlers() at intr_event_execute_handlers+0xfd/frame 0xffffff800039db50
> ithread_loop() at ithread_loop+0x9b/frame 0xffffff800039dba0
> fork_exit() at fork_exit+0x11f/frame 0xffffff800039dbf0
> fork_trampoline() at fork_trampoline+0xe/frame 0xffffff800039dbf0
> --- trap 0, rip = 0, rsp = 0xffffff800039dcb0, rbp = 0 ---

This looks like a symptom that was reported in a lot of PR reports.  

I'm assuming that I need more information?

Sean
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