[lldb-dev] Do we have any infrastructure for creating mini dump files from a loaded process or from a core file?

[Zachary Turner via lldb-dev]

What about the case where you already have a Unix core file and you aren't
in a debugger but just want to convert it?  It seems like we could have a
standalone utility that did that (one could imagine doing the reverse
too).  I'm wondering if it wouldn't be possible to do this as a library or
something that didn't have any dependencies on LLDB, that way a standalone
tool could link against this library, and so could LLDB.  I think this
would improve its usefulness quite a bit.

On Wed, Jun 13, 2018 at 2:42 PM Greg Clayton <clayborg at gmail.com> wrote:

> The goal is to take a live process (regular process just stopped, or a
> core file) and run "save_minidump ..." as a command and export a minidump
> file that can be sent elsewhere. Unix core files are too large to always
> send and they are less useful if they are not examined in the machine that
> they were produced on. So LLDB gives us the connection to the live process,
> and we can then create a minidump file. I am going to create a python
> module that can do this for us.
>
> Greg
>
>
> On Jun 13, 2018, at 2:29 PM, Zachary Turner via lldb-dev <
> lldb-dev at lists.llvm.org> wrote:
>
> Also, if the goal is to have this upstream somewhere, it would be nice to
> have a tool this be a standalone tool.  This seems like something that you
> shouldn't be required to start up a debugger to do, and probably doesn't
> have many (or any for that matters) on the rest of LLDB.
>
> On Wed, Jun 13, 2018 at 1:58 PM Leonard Mosescu <mosescu at google.com>
> wrote:
>
>> That being said, it's not exactly trivial to produce a good minidump.
>>> Crashpad  <https://chromium.googlesource.com/crashpad/crashpad>has a
>>> native & cross-platform minidump writer, that's what I'd start with.
>>>
>>
>> Addendum: I realized after sending the email that if the goal is to
>> convert core files -> LLDB -> minidump a lot of the complexity found in
>> Crashpad can be avoided, so perhaps writing an LLDB minidump writer from
>> scratch would not be too bad.
>>
>> On Wed, Jun 13, 2018 at 1:50 PM, Leonard Mosescu <mosescu at google.com>
>> wrote:
>>
>>> The minidump format is more or less documented in MSDN
>>> <https://msdn.microsoft.com/en-us/library/windows/desktop/ms679293(v=vs.85).aspx>
>>> .
>>>
>>> That being said, it's not exactly trivial to produce a good minidump. Crashpad
>>> <https://chromium.googlesource.com/crashpad/crashpad>has a native &
>>> cross-platform minidump writer, that's what I'd start with.
>>>
>>> On Wed, Jun 13, 2018 at 1:38 PM, Adrian McCarthy via lldb-dev <
>>> lldb-dev at lists.llvm.org> wrote:
>>>
>>>> Zach's right.  On Windows, lldb can produce a minidump, but it just
>>>> calls out to a Microsoft library to do so.  We don't have any
>>>> platform-agnostic code for producing a minidump.
>>>>
>>>> I've also pinged another Googler who I know might be interested in
>>>> converting between minidumps and core files (the opposite direction) to see
>>>> if he has any additional info.  I don't think he's on lldb-dev, though, so
>>>> I'll act as a relay if necessary.
>>>>
>>>> On Wed, Jun 13, 2018 at 12:07 PM, Zachary Turner via lldb-dev <
>>>> lldb-dev at lists.llvm.org> wrote:
>>>>
>>>>> We can’t produce them, but you should check out the source code of
>>>>> google breakpad / crashpad which can.
>>>>>
>>>>> That said it’s a pretty simple format, there may be enough in our
>>>>> consumer code that should allow you to produce them
>>>>>
>>>>>
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>>>>>
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>>>>
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