[lldb-dev] LLDB hang loading Linux core files from live processes (Bug 26322)

[Jim Ingham via lldb-dev]

I think that approach is kind of a bandaid.  

Core files can't resume, so it would be better to figure out why telling a core file which can't resume to resume caused us to go into a tail spin.  That should just fall out of WillResume returning false or some other better general signal.  Special-casing core files seems a bit of a hack.

That being said, if nobody has time to make a better solution, a bandaid is better than bleeding...

Jim


> On Nov 10, 2016, at 5:53 AM, Howard Hellyer via lldb-dev <lldb-dev at lists.llvm.org> wrote:
> 
> I've been hitting a hang when lldb loads some core dumps created on Linux, generally those created via gcore. 
> 
> I found an open bug for this here: 
> https://llvm.org/bugs/show_bug.cgi?id=26322 
> and the fix that was suggested there still works. (The patch needs some tidying up due to the code formatting changes.) 
> 
> I'd quite like to take that change and submit an updated patch via phabricator. Since no-one else has done that so far I was wondering if there was a problem with the approach it took or just a question of time. The patch just adds a flag to say that the process was loaded from a core file and uses that as a simple check to see if lldb should wait for the process to resume or not. Doing that works around changing the logic for working out the thread states. I'm not sure if that's bad as it avoids fixing the thread state logic or good as it allows the core to load without needing to change the thread states from the state they were in when the core file was created. 
> 
> If no-one objects I'll grab the bug and submit a patch, otherwise please let me know and I'll look at fixing it another way. 
> 
> Thanks, 
> 
> Howard Hellyer 
> IBM Runtime Technologies, IBM Systems
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