Re: [Sbcl-devel] GC fixes: splay.lisp and SIGSTOP

[Christophe R. <cs...@ca...>]

Daniel Barlow <da...@te...> writes:

> Given that there's been no release this month I'm not sure if we're in
> freeze or slush or full-on patch-u-like, but in any case I don't have
> the connectivity necessary to fix this if it turns out broken.

My assumption is that we're in patch-u-like mode, and...

> 1) The year-old allocation region bug for which I removed the
> workaround in 0.8.7.3, and caused much corrupting weirdness throughout
> January until Christophe reinstated the workaround.  The relevant
> changes for this are in gencgc.c: the actual fix is the test for
> `allocation & BOXED_PAGE' instead of `allocation == BOXED_PAGE'.  When
> an open region is sharing a page with other data, newspace scavenging
> should not skip over that other data.

> I'm reasonably certain this fix is correct.

... on this basis I've merged this one in 0.8.7.21.  I looked at it,
and your diagnosis makes sense, and explains symptoms, so as a good
empirical scientist I think it's reasonable.  Of course, users should
beware of running this on critical systems in the next few days, given
what's already happened this month; on the other hand, if you have
systems which aren't critical and a moment spare to test things, that
would be good too.

Cheers,

Christophe
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