On 9/29/14, 8:31 AM, José Pérez Arauzo wrote:
Hi Garrett,
On Sun, 28 Sep 2014 13:38:24 -0700, Garrett Cooper wrote
On Sep 28, 2014, at 0:34, José Pérez Arauzo <f...@aoek.com> wrote:
Hello,
I am trying to track down a (deadlock?) issue in CURRENT via DDB. The
kernel does
not complete hw probes on my Acer V5.
I get stuck on apic_isr looping which leads nowhere.
So I thought maybe things improve if I debug from another machine.
What do you use for kernel debugging? According to the handbook kgdb over
serial
is a good option, do you agree? I'm on a netbook with no ethernet and no
option
for firewire: can I have a USB / nullmodem setup to work?
I have no old-style uarts hardware anymore, as the handbook suggests...
Any idea is welcome before I buy extra hw. I have a USB to serial showing
up as
/dev/cuaU0, do I need to grab another one and a nullmodem cable or there
are better
alternatives? Thank you.
There was some discussion recently about this on an internal list.
Unfortunately no, there isn’t a usable way, but there were some
interesting viable methods that came up (which haven’t been
implemented): ethernet/sound/xHCI.
Your best bet, as others have noted, is to use boot -d, use WITNESS
to spot locking issues, dtrace to isolate which section of code
there are problems, and finally use one of the DEBUG options noted
in /sys/conf/NOTES and /sys/<your-architecture>/conf/NOTES .
Hope that helps!
Well, it's not so encouraging but I'll work on it.
Do you mean that we can get rid of chapter 10.5 of the handbook (On-Line
Kernel Debugging Using Remote GDB)?
no it works when you have the hardware. but modern laptops have so
little hardware..
we really will have to define an API/ABI to add to teh current
ethernet driver API so that we can do network based debugging.
it's getting harder and harder to find alternatives. (though debugging
a VM works well).
Just to have it clear, when people develop or fix drivers in FreeBSD
their only option is to use the above mentioned tools, as they have no
access to a live, on-line kernel debugger?? It's disappointing, to say
the least!
I hope Dcons + 1394 works where it's applicable.
BR,
--
José Pérez Arauzo
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