From: szgyg <szgyg@ludens.elte.hu>
To: Andy Wingo <wingo@pobox.com>
Cc: 25912@debbugs.gnu.org
Subject: bug#25912: 2.1.7 segfaults on cygwin
Date: Wed, 8 Mar 2017 17:50:16 +0100 [thread overview]
Message-ID: <20170308165016.GD1836@debbie.mshome.net> (raw)
In-Reply-To: <878toib3az.fsf@pobox.com>
On Mon, Mar 06, 2017 at 08:41:56PM +0100, Andy Wingo wrote:
> On Thu 02 Mar 2017 10:13, szgyg <szgyg@ludens.elte.hu> writes:
>
> > load_thunk_from_memory doesn't call mprotect because in loader.c
> > line 436 the ELF segment is aligned to 4k while page size is 64k.
>
> Ah, thank you for tracking this down. I think we were going to just
> change the page size to 64K for .go files but I can't remember. I think
> libc's loader doesn't actually align the pages on disk but projects
> segments of the file onto the memory image.
Changing *page-size* to 64k in linker.scm solves the problem. Size of
bootstrap/ goes from 17MB to 20MB.
> What platform is this that has 64K pages? IIUC cygwin's usual size is
> 4096 bytes.
Pagesize is 4k on windows, but we can't allocate a single page, only
batches of 16 pages. Cygwin is hiding this abomination by using 64k
as pagesize.
next prev parent reply other threads:[~2017-03-08 16:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <78221352.340980.1488551525340.ref@mail.yahoo.com>
2017-03-01 10:27 ` bug#25912: 2.1.7 segfaults on cygwin szgyg
2017-03-01 16:47 ` Andy Wingo
2017-03-02 9:13 ` szgyg
2017-03-06 19:41 ` Andy Wingo
2017-03-08 16:50 ` szgyg [this message]
2017-03-03 14:32 ` Mike Gran
2017-03-14 11:35 ` Andy Wingo
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