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

[Greg Clayton via lldb-dev]

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 <mailto: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 <mailto: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 <mailto: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 <mailto: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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