<div dir="ltr"><div><br></div><div>On Fri, May 22, 2015 at 4:14 PM, Keno Fischer <span dir="ltr"><<a href="mailto:kfischer@college.harvard.edu" target="_blank">kfischer@college.harvard.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">This might be related to GOT relocations. I rewrote that part of RuntimeDyldELFbecause I was seeing this issue. Have you tried trunk?</div><div class=""><div class="h5"></div></div></blockquote></div><div><br></div><div>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.</div><div><br></div><div>- Lang.</div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, May 22, 2015 at 4:14 PM, Keno Fischer <span dir="ltr"><<a href="mailto:kfischer@college.harvard.edu" target="_blank">kfischer@college.harvard.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">This might be related to GOT relocations. I rewrote that part of RuntimeDyldELFbecause I was seeing this issue. Have you tried trunk?</div><div class=""><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Fri, May 22, 2015 at 5:10 PM, Ramkumar Ramachandra <span dir="ltr"><<a href="mailto:artagnon@gmail.com" target="_blank">artagnon@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">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.<div><br></div><div>Thanks.</div><div><br></div><div>Ram</div></div><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, May 19, 2015 at 12:06 PM, Reid Kleckner <span dir="ltr"><<a href="mailto:rnk@google.com" target="_blank">rnk@google.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">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.<div><br></div><div>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.</div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div>On Tue, May 19, 2015 at 7:19 AM, Ramkumar Ramachandra <span dir="ltr"><<a href="mailto:artagnon@gmail.com" target="_blank">artagnon@gmail.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div><div><div dir="ltr">Hi,<div><br></div><div>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:</div><div><br></div><div> RealOffset <= INT32_MAX && RealOffset >= INT32_MIN</div><div><br></div><div>I haven't managed to successfully catch the failure in Visual to try and debug it. Any tips on how to make progress?</div><div><br></div><div>Oh, and we're on LLVM 3.5.</div><div><br></div><div>Thanks.</div><div><br></div><div>Ram</div></div>
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