Hi Everyone, If I download a recent Pharo 64 bit image, e.g.: http://files.pharo.org/image/70/latest-64.zip And use a Pharo VM from commit: commit 4749358b5717b9a2f7e1d44f9baac48ed5d80431 Author: Eliot Miranda <eliot.miranda@gmail.com> Date: Wed Mar 7 15:11:21 2018 -0800 or later, the following will reliably crash the VM: ./pharo Pharo7.0-64bit-a26248b.image eval "OCBytecodeGeneratorTest run: #testExample2" Earlier VMs don't crash. Stack dump below my signature. I'm a bit out of my depth beyond that... OS: Ubuntu 16.04 64 bit Cheers, Alistair Segmentation fault Thu Mar 15 22:39:13 2018 /home/alistair/vmmaker/opensmalltalk-vm/products/cogspur64linuxht/lib/pharo/5.0-201803072311/pharo Pharo VM version: 5.0-201803072311 Thursday 15 March 22:35:05 CET 2018 c99 [Production Spur 64-bit VM] Built from: CoInterpreter VMMaker.oscog-eem.2347 uuid: 062614a7-e3da-4b30-997a-9568911b9ff5 Mar 15 2018 With: StackToRegisterMappingCogit VMMaker.oscog-eem.2347 uuid: 062614a7-e3da-4b30-997a-9568911b9ff5 Mar 15 2018 Revision: VM: 201803072311 alistair@59fbe1b42048:vmmaker/opensmalltalk-vm $ Date: Wed Mar 7 15:11:21 2018 -0800 $ Plugins: 201803072311 alistair@59fbe1b42048:vmmaker/opensmalltalk-vm $ Build host: Linux 59fbe1b42048 4.13.0-36-generic #40~16.04.1-Ubuntu SMP Fri Feb 16 23:25:58 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux plugin path: /home/alistair/vmmaker/opensmalltalk-vm/products/cogspur64linuxht/lib/pharo/5.0-201803072311 [default: /home/alistair/vmmaker/opensmalltalk-vm/products/cogspur64linuxht/lib/pharo/5.0-201803072311/] C stack backtrace & registers: rax 0x13ab4880 rbx 0x13ab4710 rcx 0x13ab4938 rdx 0x13ab47c8 rdi 0x13ab44e8 rsi 0x13ab44e8 rbp 0x13ab4658 rsp 0x13ab49f0 r8 0x13ab3f28 r9 0x13ab3fe0 r10 0x13ab4098 r11 0x13ab4150 r12 0x13ab4208 r13 0x13ab42c0 r14 0x13ab4378 r15 0x13ab4430 rip 0x13ab4aa8 *[0x7ffd13ab4aa8] /home/alistair/vmmaker/opensmalltalk-vm/products/cogspur64linuxht/lib/pharo/5.0-201803072311/pharo[0x41aca2] /home/alistair/vmmaker/opensmalltalk-vm/products/cogspur64linuxht/lib/pharo/5.0-201803072311/pharo[0x41c87e] /lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f78ad605390] /home/alistair/vmmaker/opensmalltalk-vm/products/cogspur64linuxht/lib/pharo/5.0-201803072311/pharo(lengthOf+0x0)[0x42aca0] /home/alistair/vmmaker/opensmalltalk-vm/products/cogspur64linuxht/lib/pharo/5.0-201803072311/pharo(cogselector+0x27)[0x49bf77] /home/alistair/vmmaker/opensmalltalk-vm/products/cogspur64linuxht/lib/pharo/5.0-201803072311/pharo[0x45b15c] /home/alistair/vmmaker/opensmalltalk-vm/products/cogspur64linuxht/lib/pharo/5.0-201803072311/pharo[0x45b444] /home/alistair/vmmaker/opensmalltalk-vm/products/cogspur64linuxht/lib/pharo/5.0-201803072311/pharo(interpret+0xb238)[0x469208] /home/alistair/vmmaker/opensmalltalk-vm/products/cogspur64linuxht/lib/pharo/5.0-201803072311/pharo[0x46a4db] /home/alistair/vmmaker/opensmalltalk-vm/products/cogspur64linuxht/lib/pharo/5.0-201803072311/pharo(interpret+0x246)[0x45e216] /home/alistair/vmmaker/opensmalltalk-vm/products/cogspur64linuxht/lib/pharo/5.0-201803072311/pharo(main+0x2f8)[0x419f98] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f78acf41830] /home/alistair/vmmaker/opensmalltalk-vm/products/cogspur64linuxht/lib/pharo/5.0-201803072311/pharo(_start+0x29)[0x41a309] [0x0] Smalltalk stack dump: 0x7ffd13ad4550 I CompiledMethod>valueWithReceiver:arguments: 0x1d7e790: a(n) CompiledMethod 0x7ffd13ad45a0 M OCBytecodeGeneratorTest>testExample2 0x1d78910: a(n) OCBytecodeGeneratorTest 0x7ffd13ad1ea0 I OCBytecodeGeneratorTest(TestCase)>performTest 0x1d78910: a(n) OCBytecodeGeneratorTest 0x7ffd13ad1ed0 M [] in OCBytecodeGeneratorTest(TestCase)>runCase 0x1d78910: a(n) OCBytecodeGeneratorTest 0x7ffd13ad1f10 M BlockClosure>ensure: 0x1d7a450: a(n) BlockClosure 0x7ffd13ad1f58 I OCBytecodeGeneratorTest(TestCase)>runCase 0x1d78910: a(n) OCBytecodeGeneratorTest 0x7ffd13ad1f90 M [] in TestExecutionEnvironment>runTestCaseSafelly: 0x1d78f28: a(n) TestExecutionEnvironment 0x7ffd13ad1fc0 M BlockClosure>on:do: 0x1d7a330: a(n) BlockClosure 0x7ffd13ad2008 M [] in TestExecutionEnvironment>runTestCaseSafelly: 0x1d78f28: a(n) TestExecutionEnvironment 0x7ffd13ad2038 M BlockClosure>on:do: 0x1d7a1a8: a(n) BlockClosure 0x7ffd13ad2088 I TestExecutionEnvironment>runTestCaseSafelly: 0x1d78f28: a(n) TestExecutionEnvironment 0x7ffd13ad20c8 M [] in TestExecutionEnvironment>runTestCase: 0x1d78f28: a(n) TestExecutionEnvironment 0x7ffd13ad2108 M BlockClosure>ensure: 0x1d7a0a8: a(n) BlockClosure 0x7ffd13ad2148 M [] in TestExecutionEnvironment>runTestCase: 0x1d78f28: a(n) TestExecutionEnvironment 0x7ffd13ad2188 M BlockClosure>ifCurtailed: 0x1d79fa8: a(n) BlockClosure 0x7ffd13ad21d0 I TestExecutionEnvironment>runTestCase: 0x1d78f28: a(n) TestExecutionEnvironment 0x7ffd13ad2218 M [] in DefaultExecutionEnvironment>runTestCase: 0x23f7c30: a(n) DefaultExecutionEnvironment 0x7ffd13ad2258 M [] in CurrentExecutionEnvironment class>activate:for: 0x2404bf8: a(n) CurrentExecutionEnvironment class 0x7ffd13ad2298 M BlockClosure>ensure: 0x1d79280: a(n) BlockClosure 0x7ffd13ad22e8 I CurrentExecutionEnvironment class>activate:for: 0x2404bf8: a(n) CurrentExecutionEnvironment class 0x7ffd13ad2338 I TestExecutionEnvironment(ExecutionEnvironment)>beActiveDuring: 0x1d78f28: a(n) TestExecutionEnvironment 0x7ffd13ad2388 I DefaultExecutionEnvironment>runTestCase: 0x23f7c30: a(n) DefaultExecutionEnvironment 0x7ffd13ad23d0 I CurrentExecutionEnvironment class>runTestCase: 0x2404bf8: a(n) CurrentExecutionEnvironment class 0x7ffd13ad2418 I OCBytecodeGeneratorTest(TestCase)>runCaseManaged 0x1d78910: a(n) OCBytecodeGeneratorTest 0x7ffd13ad2450 M [] in TestResult>runCase: 0x1d78930: a(n) TestResult 0x7ffd13ad2480 M BlockClosure>on:do: 0x1d78d50: a(n) BlockClosure 0x7ffd13ad24d0 I TestResult>runCase: 0x1d78930: a(n) TestResult 0x7ffd13ad2510 M [] in OCBytecodeGeneratorTest(TestCase)>run 0x1d78910: a(n) OCBytecodeGeneratorTest 0x7ffd13ad2550 M BlockClosure>ensure: 0x1d78c50: a(n) BlockClosure 0x7ffd13ad25a0 I OCBytecodeGeneratorTest(TestCase)>run 0x1d78910: a(n) OCBytecodeGeneratorTest 0x7ffd13ad0100 I OCBytecodeGeneratorTest class(TestCase class)>run: 0x36155c8: a(n) OCBytecodeGeneratorTest class 0x7ffd13ad0138 M UndefinedObject>DoIt 0x23e78e0: a(n) UndefinedObject 0x7ffd13ad0198 I OpalCompiler>evaluate 0x1c76f90: a(n) OpalCompiler 0x7ffd13ad01d8 I OpalCompiler(AbstractCompiler)>evaluate: 0x1c76f90: a(n) OpalCompiler 0x7ffd13ad0220 M [] in EvaluateCommandLineHandler>evaluate: 0x1c770e8: a(n) EvaluateCommandLineHandler 0x7ffd13ad0250 M BlockClosure>on:do: 0x1c77118: a(n) BlockClosure 0x7ffd13ad02a8 I EvaluateCommandLineHandler>evaluate: 0x1c770e8: a(n) EvaluateCommandLineHandler 0x7ffd13ad02f8 I EvaluateCommandLineHandler>evaluateArguments 0x1c770e8: a(n) EvaluateCommandLineHandler 0x7ffd13ad0338 I EvaluateCommandLineHandler>activate 0x1c770e8: a(n) EvaluateCommandLineHandler 0x7ffd13ad0378 I EvaluateCommandLineHandler class(CommandLineHandler class)>activateWith: 0x252d400: a(n) EvaluateCommandLineHandler class 0x7ffd13ad03b8 M [] in PharoCommandLineHandler(BasicCommandLineHandler)>activateSubCommand: 0x55380b8: a(n) PharoCommandLineHandler 0x7ffd13ad03e8 M BlockClosure>on:do: 0x1c77390: a(n) BlockClosure 0x7ffd13ad0428 M PharoCommandLineHandler(BasicCommandLineHandler)>activateSubCommand: 0x55380b8: a(n) PharoCommandLineHandler 0x7ffd13ad0478 I PharoCommandLineHandler(BasicCommandLineHandler)>handleSubcommand 0x55380b8: a(n) PharoCommandLineHandler 0x7ffd13ad04b8 I PharoCommandLineHandler(BasicCommandLineHandler)>handleArgument: 0x55380b8: a(n) PharoCommandLineHandler 0x7ffd13ad04f0 M [] in PharoCommandLineHandler(BasicCommandLineHandler)>activate 0x55380b8: a(n) PharoCommandLineHandler 0x7ffd13ad0520 M BlockClosure>on:do: 0x1c77628: a(n) BlockClosure 0x7ffd13ad0560 M [] in PharoCommandLineHandler(BasicCommandLineHandler)>activate 0x55380b8: a(n) PharoCommandLineHandler 0x7ffd13ad05a0 I [] in BlockClosure>newProcess 0x1c77720: a(n) BlockClosure Most recent primitives stringHash:initialHash: basicNew successorSequences basicNew basicNew basicNew **StackOverflow** basicNew basicNew basicIdentityHash basicNew basicNew stringHash:initialHash: stringHash:initialHash: stringHash:initialHash: literal parameterAt: stringHash:initialHash: isInteger stringHash:initialHash: stringHash:initialHash: size findSubstring:in:startingAt:matchTable: indexOfAscii:inString:startingAt: indexOfAscii:inString:startingAt: stringHash:initialHash: stringHash:initialHash: * * size size copyWith: bitShift: bitShift: numTemps numTemps numTemps numTemps numTemps numTemps basicIdentityHash basicNew: size basicNew at:put: at:put: basicNew: stringHash:initialHash: compare:with:collated: perform: encodeNoTrailer encodeNoTrailer encodeNoTrailer encodeNoTrailer encodeNoTrailer encodeNoTrailer encodeNoTrailer at:put: at:put: at:put: at:put: basicNew size at:put: at:put: at:put: at:put: objectAt:put: objectAt:put: objectAt:put: objectAt:put: objectAt:put: collect: basicNew bitAnd: **PrimitiveFailure** bitAnd: **PrimitiveFailure** bitOr: **PrimitiveFailure** bitOr: **PrimitiveFailure** bitClear: new: objectAt: at:put: objectAt: at:put: objectAt: at:put: objectAt: at:put: objectAt: at:put: objectAt:put: stringHash:initialHash: objectAt:put: withArgs:executeMethod: basicNew class basicNew primUTCMicrosecondsClock * **PrimitiveFailure** digitMultiply:neg: basicNew primOffset digitCompare: // \\ valueNoContextSwitch class class basicNew class class value class **StackOverflow** basicIdentityHash basicNew basicNew basicNew new: valueNoContextSwitch size new: size size at:put: basicNew: stackp: basicNew size at: at: at: at: psValueAt:put: psValueAt:put: psValueAt:put: psValueAt:put: psValueAt:put: primitiveResume repeat wait class millisecondClockValue basicNew signal primUTCMicrosecondsClock millisecondDelayDuration + primSignal:atUTCMicroseconds: wait wait class signal basicNew valueNoContextSwitch signal primUTCMicrosecondsClock at:put: at: at:put: primSignal:atUTCMicroseconds: wait wait valueNoContextSwitch wait ifCurtailed: basicNew value class valueNoContextSwitch perform: **StackOverflow** basicNew basicNew basicNew basicIdentityHash **StackOverflow** **StackOverflow** size indexOfAscii:inString:startingAt: at: at: at: basicIdentityHash value class linkTo: basicNew value basicIdentityHash stringHash:initialHash: stringHash:initialHash: size stringHash:initialHash: stringHash:initialHash: basicNew - class new: at:put: perform:withArguments: from:if:goto:otherwise: size size size at: ~= size at:put: basicNew: stringHash:initialHash: compare:with:collated: newMethod:header: at:put: at:put: at:put: at:put: basicNew size size size at:put: at:put: at:put: at:put: at:put: at:put: at:put: at:put: at:put: at:put: objectAt:put: objectAt:put: objectAt:put: objectAt:put: from:if:goto:otherwise: from:if:goto:otherwise: from:if:goto:otherwise: objectAt:put: new: objectAt: at:put: objectAt: at:put: objectAt: at:put: objectAt: at:put: class @ withArgs:executeMethod: stack page bytes 8192 available headroom 5576 minimum unused headroom 6032 (Segmentation fault)