Re: kernel in stable breaks gdb (on merulo)
Hi,
Just to let you know that linux-image-mckinley 3.10+52 in today's
Jessie updates once again brought back gdb to life.
Go figure...
Émeric
2013/9/21 Émeric MASCHINO <emeric.maschino@gmail.com>:
> Hi,
>
> I don't know what kind of information this can provide, if any, but here's it.
>
> Working with Gentoo, I've hit the same issue with kernel 3.10.7. I
> remembered having successfully ran gdb in the past, so tested all the
> previous kernel versions I had before. I can go as old as kernel 3.3.8
> (first kernel that I ran on Gentoo) and noticed that the gdb SIGTRAP
> depends on the kernel configuration.
>
> Indeed, I have a 3.3.8 kernel configuration for which gdb isn't
> getting the SIGTRAP signal. Now, if I slightly alter this kernel
> configuration by switching from module to in-kernel compiled either
> ext4 filesystem or Radeon DRM, gdb doesn't work anymore. What's the
> difference for a given feature w.r.t memory management or memory
> layout being compiled in-kernel or as a module?
>
> It's noteworthy that, from the working kernel configuration, if I add
> a single other feature, like auditing support or cgroups support, or
> PPP module, gdb doesn't work anymore.
>
> I've also tested the working configuration for kernels 3.5.7,
> 3.5.7-r1, 3.7.10, 3.7.10-r1 and 3.8.13 without a success.
>
> Any ideas/suggestions to go further?
>
> Émeric
>
> 2013/8/15 Émeric MASCHINO <emeric.maschino@gmail.com>:
>> Hi,
>>
>> Just to let you know that, while kernel 3.9.8-1 was working fine, the
>> "gdb stops with SIGTRAP at 0" bug is back with kernel 3.10.5-1 in
>> today's "Jessie" Testing updates :-(
>>
>> Émeric
>>
>> 2013/8/8 Ben Hutchings <ben@decadent.org.uk>:
>>> On Wed, 2013-08-07 at 16:54 -0400, Camm Maguire wrote:
>>>> Greetings!
>>>>
>>>> Stephen Gran <sgran@debian.org> writes:
>>>>
>>>> > Hi,
>>>> >
>>>> > This one time, at band camp, Patrick Baggett said:
>>>> > > Hi Camm,
>>>> > > On Thu, Jul 4, 2013 at 10:51 AM, Camm Maguire <camm@maguirefamily.org>wrote:
>>>> > >
>>>> > > > Greetings! gdb stops with SIGTRAP at 0 on merulo, the sole debian ia64
>>>> > > > porterbox. This is a known bug fixed in later versions of the 3.2
>>>> > > > kernel series:
>>>> > > >
>>>> > > > http://www.mail-archive.com/debian-ia64@lists.debian.org/msg03404.html
>>>> > > >
>>>> > > > For some reason we are having trouble upgrading the kernel in the stable
>>>> > > > release, and debian-admin won't upgrade the merulo kernel without this.
>>>> > > > What is blocking the progress here?
>>>> > >
>>>> >
>>>> > I would have thought Camm should try, at a guess, the maintainers of
>>>> > the kernel, as they should have something to do with uploads of the
>>>> > kernel. Maybe I've missed something, though.
>>>>
>>>> Indeed -- thanks! By way of further information, I can report that Dann
>>>> Frazier has tried the kernel package in stable on his machine and can
>>>> use gdb without issue. So would it be possible for the kernel
>>>> maintainers listed above to determine why this bug, ostensibly fixed, is
>>>> still present at merulo?
>>>
>>> Not a clue. Dann is the only kernel maintainer with responsibility for
>>> ia64 and I'm not sure he has much opportunity to work on it any more.
>>> I've just fixed occasional build failures; beyond that I don't know or
>>> care about the platform.
>>>
>>> Ben.
>>>
>>> --
>>> Ben Hutchings
>>> The two most common things in the universe are hydrogen and stupidity.
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