GNU bug report logs -
#74805
30.0.92; Trying to build scratch/igc on Cygwin
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Reported by: Ken Brown <kbrown <at> cornell.edu>
Date: Wed, 11 Dec 2024 22:56:02 UTC
Severity: normal
Found in version 30.0.92
Done: Ken Brown <kbrown <at> cornell.edu>
Bug is archived. No further changes may be made.
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On 2024-12-22 08:24, Richard Brooksby wrote:
> On 2024-12-21 16:56, Ken Brown wrote:
>> On 12/21/2024 2:24 AM, Eli Zaretskii wrote:
>>>> Date: Fri, 20 Dec 2024 18:48:37 -0500
>>>> Cc: 74805 <at> debbugs.gnu.org, Richard Brooksby <rb <at> ravenbrook.com>
>>>> From: Ken Brown <kbrown <at> cornell.edu>
>>>> 3. The "mmap" branch is a straightforward port, mostly imitating the
>>>> FreeBSD port. It currently (with Cygwin 3.5.5) fails because of a
>>>> limitation of Cygwin's mmap. But I have a simple patch to Cygwin in
>>>> the
>>>> works that removes that limitation. With that patch, 37 of the 38 MPS
>>>> tests pass. I still need to debug the failing test. I'm cautiously
>>>> optimistic that I can get this approach to work. Either way, I expect
>>>> the Cygwin patch to soon be available in a test release of Cygwin 3.6.0
>>>> so that other Cygwin users can try it.
>>>
>>> Thanks for the update, I think this is very good news.
>>
>> I could use some help from the MPS experts in debugging the failing
>> test, which is arenacv. I ran the test under strace and didn't see
>> any mmap or munmap failures. I'm attaching the test log, which
>> doesn't mean a thing to me. I also built an unoptimized arenacv and
>> can run it under gdb if someone tells me what to look for.
>
> Hello. I can't offer much direct help just now, but here's where I'd
> start.
...
> It's very unlikely that you're actually running out of address space
on a 64-bit system.
I should add that arenacv is a coverage test that is *trying* to provoke
the ResRESOURCE error paths in some circumstances
https://github.com/Ravenbrook/mps/blob/9fd0577cf1231e61c9801c81499e5d16d0743806/code/arenacv.c#L461
but note that this isn't where the test is failing. However, it may be
relevant, perhaps if your munmap doesn't successfully free address space.
This bug report was last modified 103 days ago.
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