[LLVMdev] Sporadic "RealOffset <= INT32_MAX && RealOffset >= INT32_MIN" failures with MCJIT on Windows

[Lang Hames]

On Fri, May 22, 2015 at 4:14 PM, Keno Fischer <kfischer at college.harvard.edu>
 wrote:

> This might be related to GOT relocations. I rewrote that part of
> RuntimeDyldELFbecause I was seeing this issue. Have you tried trunk?
>

I didn't notice that you were running 3.5 the first time I read this.
Keno's diagnosis is very likely to be correct. You should try trunk if
you're able to.

- Lang.

On Fri, May 22, 2015 at 4:14 PM, Keno Fischer <kfischer at college.harvard.edu>
wrote:

> This might be related to GOT relocations. I rewrote that part of
> RuntimeDyldELFbecause I was seeing this issue. Have you tried trunk?
>
> On Fri, May 22, 2015 at 5:10 PM, Ramkumar Ramachandra <artagnon at gmail.com>
> wrote:
>
>> So it appears that we get about half the crashes with the large code
>> model. The rest are crashing in the same way. It could either mean that
>> large code model still takes that crashing codepath and that the number of
>> crashes only went down by chance, or that in one place in the flow, large
>> code model is not matched to mean ELF::R_X86_64_PC64. I'm digging into this
>> issue further, but any hints along the way would be appreciated.
>>
>> Thanks.
>>
>> Ram
>>
>> On Tue, May 19, 2015 at 12:06 PM, Reid Kleckner <rnk at google.com> wrote:
>>
>>> That sounds like a PC-relative relocation failure. Usually this happens
>>> when the relocation target is more than 2 GB away from the source. Try
>>> using the large code model or tweaking the memory manager.
>>>
>>> It turns out it's surprisingly hard to portably allocate some memory and
>>> then allocate some more within a 2 GB offset of the first allocation in a
>>> 64-bit process. For various reasons that I don't understand, reserving 2 GB
>>> of address space upfront and allocating from that is not workable for some
>>> MCJIT clients.
>>>
>>> On Tue, May 19, 2015 at 7:19 AM, Ramkumar Ramachandra <
>>> artagnon at gmail.com> wrote:
>>>
>>>> Hi,
>>>>
>>>> We are seeing sporadic crashes since we migrated to MCJIT on Win64. The
>>>> same tests pass without issues on Mac64 and Linux64. The issue is this
>>>> assertion failure in RuntimeDyldELF.c:
>>>>
>>>>   RealOffset <= INT32_MAX && RealOffset >= INT32_MIN
>>>>
>>>> I haven't managed to successfully catch the failure in Visual to try
>>>> and debug it. Any tips on how to make progress?
>>>>
>>>> Oh, and we're on LLVM 3.5.
>>>>
>>>> Thanks.
>>>>
>>>> Ram
>>>>
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>>>>
>>>
>>
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>
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