Date: Mon, 6 Aug 2018 10:18:50 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Farhan Khan <khanzf@gmail.com>, freebsd-hackers@freebsd.org Subject: Re: addr2line with FreeBSD kernel failing Message-ID: <cb94f5c8-104b-86d1-0b86-7aa495a09bd7@FreeBSD.org> In-Reply-To: <CAFd4kYCAwKKNNsZJ49aa4YUT3fQ-PqS1Dymc27LO_hXXqbedfA@mail.gmail.com> References: <CAFd4kYCAwKKNNsZJ49aa4YUT3fQ-PqS1Dymc27LO_hXXqbedfA@mail.gmail.com>
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On 06/08/2018 04:31, Farhan Khan wrote:
> Hi all,
>
> Is there a way to go from a memory address to a kernel symbol?
>
> I am working with a subsystem that uses a lot of function pointers,
> and I am not certain which particular function is being called. I have
> dtrace(1) printing out the memory address of the function, like this:
>
> printf("Runs vap->iv_newstate: 0x%p", vap->iv_newstate);
>
> The resulting memory address will be 0xffffffff834fa6d0. I was told I
> can use addr2line(1), but it seems to fail, as follows:
>
> # addr2line -e /usr/obj/usr/src/amd64.amd64/sys/GENERIC/kernel.full
> ffffffff834fa6d0
> ??:0
Try 0xffffffff834fa6d0
> Am I doing something wrong? Also, if I can do this directly in
> dtrace(1), that would be much much better. This is definitely the
> installed kernel, so there is no kernel mismatch. I have also tried
> using kernel.debug and kernel, same result.
--
Andriy Gapon
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