gcc 4 stack overflow in head

gcc 4 stack overflow in head

[Kevin Ryde]

The head built with debian i386 gcc 4 bombs with a stack overflow on
startup.  Under gdb it looks like it really has used up its 80kbytes,
but I can't tell where or why.  The same built with gcc 3.3 is ok, so
something evil has happened.


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Re: gcc 4 stack overflow in head

[Marius Vollmer]

Kevin Ryde <user42@zip.com.au> writes:

> The head built with debian i386 gcc 4 bombs with a stack overflow on
> startup.  Under gdb it looks like it really has used up its 80kbytes,
> but I can't tell where or why.  The same built with gcc 3.3 is ok, so
> something evil has happened.

I have seen this intermittently as well (for example, compiling
without optimization would give a stack overflow when launching into
the repl, but compiling with optimization would not).  Maybe the
default stack limit is dangerously close to what we need to survive...

-- 
GPG: D5D4E405 - 2F9B BCCC 8527 692A 04E3  331E FAF8 226A D5D4 E405


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Re: gcc 4 stack overflow in head

[Kevin Ryde]

Marius Vollmer <mvo@zagadka.de> writes:
>
> I have seen this intermittently as well (for example, compiling
> without optimization would give a stack overflow when launching into
> the repl, but compiling with optimization would not).  Maybe the
> default stack limit is dangerously close to what we need to survive...

Looks like gcc 4 unoptimized uses a lot more stack in ceval than
previous versions, in the head 976 bytes vs 284 with gcc 3.3.  Or in
1.6 similar 688 up from 288.  Maybe every variable gets its own stack
slot, even when they're in separate blocks.  I guess it's a case of
don't do that (unoptimize), or increase the stack limit if you do.


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