Project to improve hs_err files

Nils Eliasson nils.eliasson at
Wed Feb 12 17:30:02 UTC 2014

On 2014-02-12 15:28, Volker Simonis wrote:
> On Wed, Feb 12, 2014 at 2:14 PM, Nils Eliasson <nils.eliasson at> wrote:
>> On 2013-09-06 13:32, Mattis Castegren wrote:
>> ...
>> * Additional Data
>> ...
>> Make sure we read the OS-context when hitting asserts in debug-builds. Today
>> we only get registers, code and stack on actual crashes. Very valuable info
>> that is missing when investigating many test failures.
> I'm afraid that will be not possible. For a crash (i.e. because of a
> SIGSEGV) the kernel saves the context for the PC which caused the
> problem. 'assert' and 'guarantee' are macros which evaluate an
> expression and call report_vm_error if that expression was 'false'. I
> think the best we could do is to call 'getcontext()' after the
> evaluation of the expression, but that's not actually the context
> where the evaluation of the expression failed. But I agree that it may
> be helpful as well.

getContext() works at least for some platforms. An alternative is to a 
force crash and let the crash handler do the works as usual. It has been 
done and worked pretty well.

> And you should already get a complete stack trace for 'asserts' and
> 'guarantees' with the current implementation. Don't you see it?

I get a stacktrace but no raw stack from the current frame.


> Regards,
> Volker
>> //Nils

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