llvm dev - Jun 2016 - Adding source location information to crash dumps

Awful though it may seem, we sometimes do get crashes in the compiler,
usually because of some unhandled scenario we never thought of.
Unfortunately this typically happens when compiling very large pieces of
code, so narrowing down the context of the crash can be difficult.

 

When CLang/LLVM crashes it very helpfully creates a temporary pre-processed
file along with a shell script to run this file so the issue can be
reproduced.  And when run there is (usually) a call-stack dump, particularly
when the Debug build is run.

 

But I would also like to have a clue about what file and line in the
test-case corresponds to the context in which the crash occurs.  Is there
any easy way of adding the ability to write the 'DebugLoc' information
corresponding to the context or the crash, or is this information not
available to the crash-handler? 

 

Thanks,

 

            MartinO

 

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We use creduce to reduce large crash code to a small example,
https://embed.cs.utah.edu/creduce/
Then you can run clang under a debugger compiling the small example and
actually understand the crash.

2016-06-04 13:27 GMT+03:00 Martin J. O'Riordan via llvm-dev <
llvm-dev at lists.llvm.org>:
> Awful though it may seem, we sometimes do get crashes in the compiler,
> usually because of some unhandled scenario we never thought of.
> Unfortunately this typically happens when compiling very large pieces of
> code, so narrowing down the context of the crash can be difficult.
>
>
>
> When CLang/LLVM crashes it very helpfully creates a temporary
> pre-processed file along with a shell script to run this file so the issue
> can be reproduced.  And when run there is (usually) a call-stack dump,
> particularly when the Debug build is run.
>
>
>
> But I would also like to have a clue about what file and line in the
> test-case corresponds to the context in which the crash occurs.  Is there
> any easy way of adding the ability to write the ‘DebugLoc’ information
> corresponding to the context or the crash, or is this information not
> available to the crash-handler?
>
>
>
> Thanks,
>
>
>
>             MartinO
>
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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Perfect, thanks

 

From: Yaron Keren [mailto:yaron.keren at gmail.com] 
Sent: 04 June 2016 19:06
To: Martin J. O'Riordan <Martin.ORiordan at movidius.com>
Cc: LLVM Developers <llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] Adding source location information to crash dumps

 

We use creduce to reduce large crash code to a small example,
https://embed.cs.utah.edu/creduce/

Then you can run clang under a debugger compiling the small example and actually
understand the crash.

 

2016-06-04 13:27 GMT+03:00 Martin J. O'Riordan via llvm-dev <llvm-dev at
lists.llvm.org <mailto:llvm-dev at lists.llvm.org> >:

Awful though it may seem, we sometimes do get crashes in the compiler, usually
because of some unhandled scenario we never thought of.  Unfortunately this
typically happens when compiling very large pieces of code, so narrowing down
the context of the crash can be difficult.

 

When CLang/LLVM crashes it very helpfully creates a temporary pre-processed file
along with a shell script to run this file so the issue can be reproduced.  And
when run there is (usually) a call-stack dump, particularly when the Debug build
is run.

 

But I would also like to have a clue about what file and line in the test-case
corresponds to the context in which the crash occurs.  Is there any easy way of
adding the ability to write the ‘DebugLoc’ information corresponding to the
context or the crash, or is this information not available to the crash-handler?

 

Thanks,

 

            MartinO

 


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