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From: shreyank amartya <shreyankfbsd@gmail.com>
Date: Thu, 12 Sep 2019 14:23:14 +0530
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Subject: Re: hwpmc ktrdump: failed to resolve ktr symbols
To: Navdeep Parhar <nparhar@gmail.com>
Cc: freebsd-drivers@freebsd.org, freebsd-hackers@freebsd.org
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Thanks, yes it seems I was missing both those options (KTR and DDB) in my
kernel config.
Now, I have a module (hwpmc) from which I intend to collect traces.
However, when I build and load it, I don't see any ktraces when using it.
But if I install it and load the module on boot, ktraces appear. Why does
that happen? Anyway around that?

Thanks
Shreyank

On Fri, Aug 30, 2019 at 9:37 PM Navdeep Parhar <nparhar@gmail.com> wrote:

> On 2019-08-30 03:54, shreyank amartya wrote:
> > Hi,
> >
> > I'm trying to collect traces from hwpmc module. I compiled the module
> with
> > -DHWPMC_DEBUG option and set the sysctl kern.hwpmc.debugflags but I'm
> > unable to retrive the traces using ktrdump. I get this error message:
> >
> > ktrdump: failed to resolve ktr symbols
> >
> > I'm guessing that this error occurs because the symbols for hwpmc module
> > (compiled and loaded separately) are not a part of kernel. If this is the
> > case, then how do I get those symbols. In the ktr man page its also
> > mentioned that ddb and gdb can retrieve ktraces.
> >
> > I found the ddb command show ktr. But how do I invoke ddb (without a
> panic)?
>
> sysctl debug.kdb.enter=1
>
> >
> > I'm unable to find how can I use gdb to view the traces (I launched kgdb
> > but could not find a command to show kernel traces).
> >
> > Any idea on how to get ktrdump working? Or get the kernel traces.
>
> You need a kernel with KTR support.  See ktr(4) for a full list of
> the options and other details.  See "sysctl kern.conftxt" for what's
> in your running kernel.
>
> Regards,
> Navdeep
>