Date: Wed, 30 Jul 2014 14:37:45 -0700 From: Nidal Khalil <nedmath@gmail.com> To: Benjamin Kaduk <bjk@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: freebsd-hackers Digest, Vol 588, Issue 1 Message-ID: <CADoY-6hJ1wDqKHrSkPmFjz_48voAgEyu4sT2RYVOn_gDBWTD9g@mail.gmail.com> In-Reply-To: <alpine.GSO.1.10.1407301347080.21571@multics.mit.edu> References: <mailman.7.1406030400.87390.freebsd-hackers@freebsd.org> <CADoY-6jDa-nD9w6jLUuUttjNgEbV0eJAu2Hm9AvFvAWm6Y9ASg@mail.gmail.com> <CADoY-6i5jytJswq9Ck3cir0YOLt62CKPdmMz=nSDCNQre6tGbg@mail.gmail.com> <alpine.GSO.1.10.1407222136380.21571@multics.mit.edu> <CADoY-6jy5khBRrkw8mw5fG1OnpvNYqf=-4YkkFhhR2zOb-pkdQ@mail.gmail.com> <alpine.GSO.1.10.1407231055190.21571@multics.mit.edu> <CADoY-6jAzwYx5H3JciReFv01W1eGd6phqDv-uLq7pEGiD%2B-gFQ@mail.gmail.com> <alpine.GSO.1.10.1407292022230.21571@multics.mit.edu> <CADoY-6g9%2BriVTFDu-p7FhQ=ogWWHhp9mF8EAh0v94oLJX3zqnA@mail.gmail.com> <alpine.GSO.1.10.1407301347080.21571@multics.mit.edu>
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My kernel is compiled with -g as well. However I am loading a driver module. That is compiled with -g but the modules will not load if it is not stripped. it is using the objcopy found in bsd.kmod.mk. This is the reason that bt or where shows the backtrace but not the local frame symbols. On the gdb front The gdb that came with the distro is 6.1.1 has two problems: 1- does not understand -k option 2- without -k it does not understand the vmcore file format. Is there a utility that will convert a vmcore to a format that gdb understands. Thanks Nidal On Wed, Jul 30, 2014 at 10:57 AM, Benjamin Kaduk <bjk@freebsd.org> wrote: > On Wed, 30 Jul 2014, Nidal Khalil wrote: > > Yeah. This is the doc. >> Kgdb works for bt only, info locals results in no symbols found. >> > > kgdb works great on crash dumps for me. > My kernels are compiled using "makeoptions DEBUG=-g", and sometimes with > -O0. I would have to check, but suspect that the kernels for some releases > do not have the debug symbols enabled. > > > In regards to gdb the -k option doesn't work. It results in unknown >> option. >> > > Our kgdb is customized to work with FreeBSD kernel dumps; stock gdb isn't > really going to work. > > > With out it it doesn't understand the vmcore file format. >> Debugging tools are broken for release 9.2 and release 9.3 with the >> exception of ddb. >> The documentation is incorrect and doesn't match the new releases. >> > > I think you will need to provide a more detailed pointer to what precise > documentation steps you think are incorrect, and (copy/paste of) the actual > behavior you are seeing, in order for us to try to reproduce it. As I say, > kgdb works fine in my usage. > > > Nidal >> On Jul 29, 2014 5:23 PM, "Benjamin Kaduk" <bjk@freebsd.org> wrote: >> >> You did not heed my note about public lists. >>> You did not link to what documentation you believe is incorrect. >>> You might consult http://www.freebsd.org/doc/en_ >>> US.ISO8859-1/books/developers-handbook/kerneldebug-gdb.html >>> >>> On Tue, 29 Jul 2014, Nidal Khalil wrote: >>> >>> The documentation for gdb is not correct? >>> >>>> >>>> I am trying to use gdb to analyze a kernel crash. However the -k is >>>> recognized. This is version 6.1.1 that came with the installation. >>>> Using it without -k it will not understand the vmcore file format >>>> do I need a different gdb. Thanks >>>> >>>> Nidal >>>> >>>> >>>> >>>> On Wed, Jul 23, 2014 at 7:56 AM, Benjamin Kaduk <bjk@freebsd.org> >>>> wrote: >>>> >>>> On Wed, 23 Jul 2014, Nidal Khalil wrote: >>>> >>>>> >>>>> I have no interest in firewire. How can I do this over Ethernet. The >>>>> >>>>> documentation is a little bit vague in this area. Thanks >>>>>> >>>>> > I don't believe that remote debugging over ethernet has been implemented > yet, though I do remember some talk about interest and/or the beginning of > a project, years ago. > > -Ben >
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