[cffi-devel] [Sbcl-devel] GC write-protected mappings vs. the OS kernel

[Nikodemus Siivola]

2009/11/10 Juho Snellman <jsnell at iki.fi>:
> Samium Gromoff <_deepfire at feelingofgreen.ru> writes:
>> A missing detail: while the vector is created in a live core all /seems/
>> to be well[1].  But when it comes from a dumped core, it gets a chance
>> (there doesn't appears to be a determinism there) of being in a
>> write-protected region.
>
> Yeah, that'd explain it. We don't correctly restore information about
> whether a page is boxed or unboxed when loading a core (relevant bits
> in coreparse.c, and in gencgc.c:gencgc_pickup_dynamic).

By a happy coincidence, I've been working on this area recently.
Expect to see a commit that keeps track of unboxed pages in saved
cores soonish...

Cheers,

 -- Nikodemus