<div dir="ltr">Hmm, yes, I didn't notice that in the backtrace but you're right.<div><br></div><div>I don't think "assume infinite resources" is the bug though. malloc()'s not signal-safe on linux, so it probably isn't on MacOS either. We shouldn't be calling malloc() from the signal handler.</div><div><br></div><div>As a practical matter, maybe this is a feature that you could disable either at build-time or runtime?</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jun 28, 2017 at 10:25 AM, David Barto <span dir="ltr"><<a href="mailto:barto@cambridgesemantics.com" target="_blank">barto@cambridgesemantics.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Looks like the bug is that the crash handler is attempting to allocate memory, and the reason it was crashing was that it ran out of memory.<div><br></div><div>Sounds like a real clang issue to deal with as the compiler should not assume infinite resources.</div><span class="HOEnZb"><font color="#888888"><div><br></div><div><span class="m_-7973541320077869025Apple-tab-span" style="white-space:pre-wrap"> </span>David</div></font></span><div><div><div class="h5"><br><div><blockquote type="cite"><div>On Jun 28, 2017, at 8:18 AM, Brian Cain <<a href="mailto:brian.cain@gmail.com" target="_blank">brian.cain@gmail.com</a>> wrote:</div><br class="m_-7973541320077869025Apple-interchange-newline"><div><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Wed, Jun 28, 2017 at 10:10 AM, David Barto <span dir="ltr"><<a href="mailto:barto@cambridgesemantics.com" target="_blank">barto@cambridgesemantics.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">This is part of an in-memory system (no swap space configured) so RSS would match the AS size for this use case. From what I read about RSS and AS for MacOS and Linux.<div><br></div><div>Why did it lock up, why not throw the exception and exit?</div><span class="m_-7973541320077869025HOEnZb"><font color="#888888"><div><br></div><div><span class="m_-7973541320077869025m_-7213370958083013744Apple-tab-span" style="white-space:pre-wrap"></span></div></font></span><div><div><div><div class="m_-7973541320077869025h5"><div><blockquote type="cite"><div><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div><br></div></div></div></div></div></blockquote></div></div></div></div></div></div></blockquote><div><br></div><div>Dunno, it seems like the OS is driving now and it's not immediately clear to me why that system call wouldn't yield either success or failure. But clang is asking for a resource (more memory), and I've seen those stall before. My experience with linux (may or may not be applicable) leads me to believe that the system is perhaps resource-constrained and your task is pending while it tries to free up those resources.</div><div><br></div><div>RLIMIT_AS and RLIMIT_RSS are distinct on linux, I guess I am a little surprised to see that they're not on MacOS.</div><div><br></div><div>In any case, the most likely culprit is your setrlimit. If I were you I would take clang out of the loop entirely and write a test program that does allocations just like the ones clang does (various sized mallocs, you could try profiling to get a ballpark histogram). I would be surprised if you don't see the same behavior.</div><div><br></div><div>-Brian</div></div>
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<div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word">David Barto<br><a href="mailto:barto@cambridgesemantics.com" target="_blank">barto@cambridgesemantics.com</a></div><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><br></div><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word">Sometimes, my best code does nothing. Most of the rest of it has bugs.<br><br><br></div></div>
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