<html><head><base href="x-msg://51/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Looks like stack overflow to me.<div><br><div>
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<br><div><div>On Feb 12, 2011, at 9:09 AM, Jay K wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div class="hmmessage" style="font-size: 10pt; font-family: Tahoma; ">> >LINUXLIBC6 : seg fault<br><br>I've seen this now.<br><br>Program received signal SIGSEGV, Segmentation fault.<br>[Switching to Thread 0xb3200b90 (LWP 18154)]<br>0xb6dee58f in RTCollector__Move (self=0xb6a9000c, cp=0xb6a20014)<br> at ../src/runtime/common/RTCollector.m3:409<br>409 IF hdr.typecode = RT0.TextLitTypecode THEN RETURN END;<br>1: x/i $pc<br>0xb6dee58f <RTCollector__Move+83>: mov (%eax),%eax<br>(gdb) bt 9<br>#0 0xb6dee58f in RTCollector__Move (self=0xb6a9000c, cp=0xb6a20014)<br> at ../src/runtime/common/RTCollector.m3:409<br>#1 0xb6deaa46 in RTHeapMap__Walk (x=0xb6a20014, pc=0xb7738648, v=0xb6a9000c)<br> at ../src/runtime/common/RTHeapMap.m3:202<br>#2 0xb6dea341 in RTHeapMap__DoWalkRef (t=0xb7738694, a=0xb6a20014,<span class="Apple-converted-space"> </span><br> v=0xb6a9000c) at ../src/runtime/common/RTHeapMap.m3:62<br>#3 0xb6dea318 in RTHeapMap__DoWalkRef (t=0xb7739c54, a=0xb6a2000c,<span class="Apple-converted-space"> </span><br> v=0xb6a9000c) at ../src/runtime/common/RTHeapMap.m3:57<br>#4 0xb6dea318 in RTHeapMap__DoWalkRef (t=0xb7739e68, a=0xb6a2000c,<span class="Apple-converted-space"> </span><br> v=0xb6a9000c) at ../src/runtime/common/RTHeapMap.m3:57<br>#5 0xb6dea2bf in RTHeapMap__WalkRef (h=0xb6a20008, v=0xb6a9000c)<br> at ../src/runtime/common/RTHeapMap.m3:47<br>#6 0xb6df0636 in RTCollector__CleanBetween (h=0xb6a20008, he=0xb6a30000,<span class="Apple-converted-space"> </span><br> clean=0 '\0') at ../src/runtime/common/RTCollector.m3:1091<br>#7 0xb6df0473 in RTCollector__CleanPage (page=0xb6a20000)<br> at ../src/runtime/common/RTCollector.m3:1064<br>#8 0xb6defc96 in RTCollector__CollectSomeInStateZero ()<br> at ../src/runtime/common/RTCollector.m3:885<br>(More stack frames follow...)<br>(gdb) p $eax<br>$2 = 2097148<br>(gdb) p/x $eax<br>$3 = 0x1ffffc<br>(gdb) x/x $eax+4<br>0x200000: Cannot access memory at address 0x200000<br>(gdb) x/x $eax<br>0x1ffffc: Cannot access memory at address 0x1ffffc<br><br><br>Maybe I should try with a correctly sized jmpbuf to assure it isn't stack overflow?<br>But notice that the next page doesn't work either. Actually I tried adding<br>a lot to $eax and still not accessible.<br><br><br>Maybe maybe maybe maybe I'll dig into this. But I'm very busy lately and maybe indefinitely into future..<br><br><br>Thanks,<br> - Jay<br><br><br>> To:<span class="Apple-converted-space"> </span><a href="mailto:jay.krell@cornell.edu">jay.krell@cornell.edu</a>;<span class="Apple-converted-space"> </span><a href="mailto:hosking@cs.purdue.edu">hosking@cs.purdue.edu</a><br>> Date: Fri, 11 Feb 2011 22:48:12 -0800<br>> From:<span class="Apple-converted-space"> </span><a href="mailto:mika@async.caltech.edu">mika@async.caltech.edu</a><br>> CC:<span class="Apple-converted-space"> </span><a href="mailto:m3devel@elegosoft.com">m3devel@elegosoft.com</a><br>> Subject: Re: [M3devel] threading on Windows?<br>><span class="Apple-converted-space"> </span><br>> Well, with the following changes: re-bootstrapping on the two Linux<br>> systems and removal of the -pthread flag on FreeBSD4, all is well.<br>> User threading works on all the architectures listed below, at least<br>> as far as the thread testing program can test it. (It seems that because<br>> of the way pthread_atfork is coded, pthread is not needed at all on<br>> FreeBSD4.)<br>><span class="Apple-converted-space"> </span><br>> Mika<br>><span class="Apple-converted-space"> </span><br>> Mika Nystrom writes:<br>> >Another odd datapoint is that even rather aggressive testing seems not<br>> >to have any trouble on I386_DARWIN (same as AMD64_FREEBSD). With user<br>> >threads, of course.<br>> ><br>> >So status right now of user threads seems to be:<br>> ><br>> >FreeBSD4 : strange failure in libpthread as reported by gdb<br>> >LINUXLIBC6 : seg fault<br>> >AMD64_LINUX : seg fault<br>> >AMD64_FREEBSD : OK<br>> >I386_DARWIN : OK<br></div></span></blockquote></div><br></div></body></html>