At Fri, 11 Dec 2015 14:50:52 -0400, David Bremner wrote:
> David Bremner <[email protected]> writes:
> 
> > A helpful sysadmin (hi pabs!) ran the command on the autobuilder as well, 
> and got
> > _almost_ the same output.
> >
> > It most likely is significant that the gcc version is different. I'll
> > try upgrading the porterbox chroot and see if it duplicates the
> > autobuilder failure.
> >
> 
> I managed this earlier than expected, and indeed I can confirm the jit
> buffer overflow in racketcgc is repeatable on the porterbox (even the
> address that triggers the error is the same) in my experiments.
> 
> So in principle I could run racketcgc under gdb, if it would help.

That's great news, since I haven't made any progress in my attempts.

Can you try changing, in "jit.h" around line 1324

 #define PAST_LIMIT() ....
 #define CHECK_LIMIT() ....
 #if 1

to

 #define PAST_LIMIT() ....
 #define CHECK_LIMIT() ....
 #if 0

?

Hopefully, the crash will then provide more useful information.

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