Re: Panic _at_ orm_identify+0x308 (kernel probes) after r327103 -> r327140

On 24 Dec 2017, at 14:27, David Wolfskill <david_at_catwhisker.org> wrote:
> 
> Had this on the laptop; fotunately, also got it on the build machine (as
> it's a lot easier to work with the serial console of the latter for
> this -- and it runs a GENERIC kernel):
...
> Fatal trap 9: general protection fault while in kernel mode
> cpuid = 2; apic id = 02
> instruction pointer     = 0x20:0xffffffff81066968
> stack pointer           = 0x28:0xffffffff82286a90
> frame pointer           = 0x28:0xffffffff82286ad0
> 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         = 0 (swapper)
> [ thread pid 0 tid 100000 ]
> Stopped at      orm_identify+0x308:     movq    (%r14),%rax
> db> bt
> Tracing pid 0 tid 100000 td 0xffffffff81e94340
> orm_identify() at orm_identify+0x308/frame 0xffffffff82286ad0
> bus_generic_probe() at bus_generic_probe+0x74/frame 0xffffffff82286b00
> isa_probe_children() at isa_probe_children+0x19/frame 0xffffffff82286b50
> mi_startup() at mi_startup+0x9c/frame 0xffffffff82286b70
> btext() at btext+0x2c

Since there is "isa" in the backtrace, I would consider r327120 ("Warn
when nonPNP ISA devices are attached in GENERIC that they are being
removed from GENERIC in 12") by Warner suspect...

Specifically, this change:
https://svnweb.freebsd.org/base/head/sys/x86/isa/orm.c?r1=327120&r2=327119&pathrev=327120

-Dimitry