./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/memsafety-ext3/derefAfterFree1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 5fbdf5bf Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/memsafety-ext3/derefAfterFree1.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d452f938d74713dbff7e0330f8ef393409d67ffe ......................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(valid-deref) --- Real Ultimate output --- This is Ultimate 0.2.1-wip.dd.seqcomp-5fbdf5b [2021-08-30 19:12:19,403 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-30 19:12:19,405 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-30 19:12:19,433 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-30 19:12:19,434 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-30 19:12:19,435 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-30 19:12:19,436 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-30 19:12:19,438 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-30 19:12:19,440 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-30 19:12:19,441 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-30 19:12:19,442 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-30 19:12:19,443 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-30 19:12:19,443 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-30 19:12:19,444 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-30 19:12:19,445 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-30 19:12:19,446 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-30 19:12:19,447 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-30 19:12:19,448 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-30 19:12:19,449 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-30 19:12:19,451 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-30 19:12:19,452 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-30 19:12:19,453 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-30 19:12:19,454 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-30 19:12:19,455 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-30 19:12:19,457 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-30 19:12:19,457 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-30 19:12:19,458 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-30 19:12:19,458 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-30 19:12:19,459 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-30 19:12:19,460 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-30 19:12:19,460 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-30 19:12:19,461 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-30 19:12:19,461 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-30 19:12:19,462 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-30 19:12:19,463 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-30 19:12:19,463 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-30 19:12:19,464 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-30 19:12:19,464 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-30 19:12:19,464 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-30 19:12:19,465 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-30 19:12:19,466 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-30 19:12:19,467 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-08-30 19:12:19,489 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-30 19:12:19,489 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-30 19:12:19,490 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-30 19:12:19,490 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-30 19:12:19,491 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-30 19:12:19,491 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-30 19:12:19,492 INFO L138 SettingsManager]: * Use SBE=true [2021-08-30 19:12:19,492 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-30 19:12:19,492 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-30 19:12:19,492 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-08-30 19:12:19,493 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-30 19:12:19,493 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-30 19:12:19,493 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-30 19:12:19,493 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-08-30 19:12:19,494 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-08-30 19:12:19,494 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-08-30 19:12:19,494 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-30 19:12:19,494 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-08-30 19:12:19,495 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-30 19:12:19,495 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-30 19:12:19,495 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-30 19:12:19,496 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-30 19:12:19,496 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-30 19:12:19,496 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-30 19:12:19,496 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-30 19:12:19,497 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-30 19:12:19,497 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-30 19:12:19,497 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-30 19:12:19,497 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-30 19:12:19,498 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d452f938d74713dbff7e0330f8ef393409d67ffe [2021-08-30 19:12:19,860 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-30 19:12:19,891 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-30 19:12:19,894 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-30 19:12:19,895 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-30 19:12:19,897 INFO L275 PluginConnector]: CDTParser initialized [2021-08-30 19:12:19,899 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/memsafety-ext3/derefAfterFree1.c [2021-08-30 19:12:19,968 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/15b14f562/b0edeaaf0a174ff9b8d403dbacc34f8b/FLAG0947149b1 [2021-08-30 19:12:20,434 INFO L306 CDTParser]: Found 1 translation units. [2021-08-30 19:12:20,436 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/memsafety-ext3/derefAfterFree1.c [2021-08-30 19:12:20,441 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/15b14f562/b0edeaaf0a174ff9b8d403dbacc34f8b/FLAG0947149b1 [2021-08-30 19:12:20,464 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/15b14f562/b0edeaaf0a174ff9b8d403dbacc34f8b [2021-08-30 19:12:20,467 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-30 19:12:20,470 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-08-30 19:12:20,472 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-30 19:12:20,472 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-30 19:12:20,475 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-30 19:12:20,476 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.08 07:12:20" (1/1) ... [2021-08-30 19:12:20,477 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7da4fde8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 07:12:20, skipping insertion in model container [2021-08-30 19:12:20,477 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.08 07:12:20" (1/1) ... [2021-08-30 19:12:20,482 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-30 19:12:20,493 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-30 19:12:20,628 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-30 19:12:20,638 INFO L203 MainTranslator]: Completed pre-run [2021-08-30 19:12:20,648 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-30 19:12:20,660 INFO L208 MainTranslator]: Completed translation [2021-08-30 19:12:20,661 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 07:12:20 WrapperNode [2021-08-30 19:12:20,661 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-30 19:12:20,663 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-30 19:12:20,664 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-30 19:12:20,664 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-30 19:12:20,673 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 07:12:20" (1/1) ... [2021-08-30 19:12:20,674 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 07:12:20" (1/1) ... [2021-08-30 19:12:20,680 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 07:12:20" (1/1) ... [2021-08-30 19:12:20,681 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 07:12:20" (1/1) ... [2021-08-30 19:12:20,687 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 07:12:20" (1/1) ... [2021-08-30 19:12:20,688 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 07:12:20" (1/1) ... [2021-08-30 19:12:20,692 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 07:12:20" (1/1) ... [2021-08-30 19:12:20,694 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-30 19:12:20,695 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-30 19:12:20,695 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-30 19:12:20,696 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-30 19:12:20,696 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 07:12:20" (1/1) ... [2021-08-30 19:12:20,703 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-30 19:12:20,712 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-30 19:12:20,726 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-08-30 19:12:20,760 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-08-30 19:12:20,786 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-08-30 19:12:20,786 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-30 19:12:20,787 INFO L138 BoogieDeclarations]: Found implementation of procedure freePointer [2021-08-30 19:12:20,787 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-08-30 19:12:20,787 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-08-30 19:12:20,788 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-08-30 19:12:20,788 INFO L130 BoogieDeclarations]: Found specification of procedure freePointer [2021-08-30 19:12:20,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-08-30 19:12:20,789 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-08-30 19:12:20,789 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-08-30 19:12:20,789 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-08-30 19:12:20,790 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-08-30 19:12:20,790 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-30 19:12:20,790 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-08-30 19:12:20,939 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-30 19:12:20,939 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-08-30 19:12:20,941 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.08 07:12:20 BoogieIcfgContainer [2021-08-30 19:12:20,941 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-30 19:12:20,945 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-30 19:12:20,945 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-30 19:12:20,948 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-30 19:12:20,948 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.08 07:12:20" (1/3) ... [2021-08-30 19:12:20,949 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b7a568d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.08 07:12:20, skipping insertion in model container [2021-08-30 19:12:20,952 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.08 07:12:20" (2/3) ... [2021-08-30 19:12:20,952 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b7a568d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.08 07:12:20, skipping insertion in model container [2021-08-30 19:12:20,952 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.08 07:12:20" (3/3) ... [2021-08-30 19:12:20,954 INFO L111 eAbstractionObserver]: Analyzing ICFG derefAfterFree1.c [2021-08-30 19:12:20,961 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-30 19:12:20,961 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2021-08-30 19:12:21,007 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-30 19:12:21,018 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-08-30 19:12:21,018 INFO L340 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-08-30 19:12:21,035 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 12 states have (on average 1.5) internal successors, (18), 18 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-30 19:12:21,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-08-30 19:12:21,041 INFO L505 BasicCegarLoop]: Found error trace [2021-08-30 19:12:21,042 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-30 19:12:21,042 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting freePointerErr0ASSERT_VIOLATIONMEMORY_FREE === [freePointerErr0ASSERT_VIOLATIONMEMORY_FREE, freePointerErr1ASSERT_VIOLATIONMEMORY_FREE, freePointerErr2ASSERT_VIOLATIONMEMORY_FREE (and 3 more)] === [2021-08-30 19:12:21,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-30 19:12:21,048 INFO L82 PathProgramCache]: Analyzing trace with hash 1608321379, now seen corresponding path program 1 times [2021-08-30 19:12:21,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-30 19:12:21,057 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [909123108] [2021-08-30 19:12:21,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-30 19:12:21,058 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-30 19:12:21,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-30 19:12:21,276 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-30 19:12:21,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-30 19:12:21,285 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-30 19:12:21,286 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-30 19:12:21,286 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [909123108] [2021-08-30 19:12:21,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [909123108] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-30 19:12:21,287 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-30 19:12:21,288 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-30 19:12:21,289 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707193767] [2021-08-30 19:12:21,293 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-08-30 19:12:21,309 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-30 19:12:21,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-08-30 19:12:21,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-08-30 19:12:21,348 INFO L87 Difference]: Start difference. First operand has 25 states, 12 states have (on average 1.5) internal successors, (18), 18 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 6 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-30 19:12:21,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-30 19:12:21,492 INFO L93 Difference]: Finished difference Result 24 states and 23 transitions. [2021-08-30 19:12:21,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-08-30 19:12:21,495 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-08-30 19:12:21,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-30 19:12:21,501 INFO L225 Difference]: With dead ends: 24 [2021-08-30 19:12:21,502 INFO L226 Difference]: Without dead ends: 21 [2021-08-30 19:12:21,505 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 82.68ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-08-30 19:12:21,508 INFO L928 BasicCegarLoop]: 5 mSDtfsCounter, 22 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 64.49ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.49ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 76.46ms IncrementalHoareTripleChecker+Time [2021-08-30 19:12:21,508 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 20 Invalid, 68 Unknown, 0 Unchecked, 2.49ms Time], IncrementalHoareTripleChecker [5 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 76.46ms Time] [2021-08-30 19:12:21,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-08-30 19:12:21,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-08-30 19:12:21,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 15 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-30 19:12:21,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 20 transitions. [2021-08-30 19:12:21,533 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 20 transitions. Word has length 9 [2021-08-30 19:12:21,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-30 19:12:21,534 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 20 transitions. [2021-08-30 19:12:21,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-30 19:12:21,534 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 20 transitions. [2021-08-30 19:12:21,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-08-30 19:12:21,535 INFO L505 BasicCegarLoop]: Found error trace [2021-08-30 19:12:21,535 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-30 19:12:21,536 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-30 19:12:21,536 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting freePointerErr1ASSERT_VIOLATIONMEMORY_FREE === [freePointerErr0ASSERT_VIOLATIONMEMORY_FREE, freePointerErr1ASSERT_VIOLATIONMEMORY_FREE, freePointerErr2ASSERT_VIOLATIONMEMORY_FREE (and 3 more)] === [2021-08-30 19:12:21,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-30 19:12:21,537 INFO L82 PathProgramCache]: Analyzing trace with hash -1681644769, now seen corresponding path program 1 times [2021-08-30 19:12:21,537 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-30 19:12:21,537 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908059617] [2021-08-30 19:12:21,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-30 19:12:21,538 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-30 19:12:21,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-30 19:12:21,617 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-30 19:12:21,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-30 19:12:21,626 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-30 19:12:21,626 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-30 19:12:21,626 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908059617] [2021-08-30 19:12:21,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908059617] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-30 19:12:21,627 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-30 19:12:21,627 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-30 19:12:21,627 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980544829] [2021-08-30 19:12:21,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-08-30 19:12:21,628 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-30 19:12:21,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-08-30 19:12:21,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-08-30 19:12:21,630 INFO L87 Difference]: Start difference. First operand 21 states and 20 transitions. Second operand has 6 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-30 19:12:21,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-30 19:12:21,750 INFO L93 Difference]: Finished difference Result 20 states and 19 transitions. [2021-08-30 19:12:21,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-30 19:12:21,751 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-08-30 19:12:21,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-30 19:12:21,751 INFO L225 Difference]: With dead ends: 20 [2021-08-30 19:12:21,752 INFO L226 Difference]: Without dead ends: 20 [2021-08-30 19:12:21,752 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 74.24ms TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-08-30 19:12:21,754 INFO L928 BasicCegarLoop]: 4 mSDtfsCounter, 17 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 59.22ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.10ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 76.21ms IncrementalHoareTripleChecker+Time [2021-08-30 19:12:21,754 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 14 Invalid, 58 Unknown, 0 Unchecked, 2.10ms Time], IncrementalHoareTripleChecker [4 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 76.21ms Time] [2021-08-30 19:12:21,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-08-30 19:12:21,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-08-30 19:12:21,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 14 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-30 19:12:21,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 19 transitions. [2021-08-30 19:12:21,758 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 19 transitions. Word has length 10 [2021-08-30 19:12:21,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-30 19:12:21,759 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 19 transitions. [2021-08-30 19:12:21,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-30 19:12:21,759 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 19 transitions. [2021-08-30 19:12:21,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-08-30 19:12:21,760 INFO L505 BasicCegarLoop]: Found error trace [2021-08-30 19:12:21,760 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-30 19:12:21,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-08-30 19:12:21,761 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting freePointerErr2ASSERT_VIOLATIONMEMORY_FREE === [freePointerErr0ASSERT_VIOLATIONMEMORY_FREE, freePointerErr1ASSERT_VIOLATIONMEMORY_FREE, freePointerErr2ASSERT_VIOLATIONMEMORY_FREE (and 3 more)] === [2021-08-30 19:12:21,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-30 19:12:21,761 INFO L82 PathProgramCache]: Analyzing trace with hash -591380251, now seen corresponding path program 1 times [2021-08-30 19:12:21,762 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-30 19:12:21,762 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1166500402] [2021-08-30 19:12:21,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-30 19:12:21,762 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-30 19:12:21,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-30 19:12:21,808 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-30 19:12:21,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-30 19:12:21,815 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-30 19:12:21,815 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-30 19:12:21,815 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1166500402] [2021-08-30 19:12:21,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1166500402] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-30 19:12:21,816 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-30 19:12:21,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-30 19:12:21,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501768753] [2021-08-30 19:12:21,817 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-08-30 19:12:21,817 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-30 19:12:21,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-08-30 19:12:21,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-08-30 19:12:21,818 INFO L87 Difference]: Start difference. First operand 20 states and 19 transitions. Second operand has 6 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-30 19:12:21,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-30 19:12:21,874 INFO L93 Difference]: Finished difference Result 19 states and 18 transitions. [2021-08-30 19:12:21,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-30 19:12:21,874 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-08-30 19:12:21,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-30 19:12:21,875 INFO L225 Difference]: With dead ends: 19 [2021-08-30 19:12:21,875 INFO L226 Difference]: Without dead ends: 19 [2021-08-30 19:12:21,876 INFO L927 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 34.01ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-08-30 19:12:21,877 INFO L928 BasicCegarLoop]: 5 mSDtfsCounter, 8 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 25.65ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.29ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 31.76ms IncrementalHoareTripleChecker+Time [2021-08-30 19:12:21,877 INFO L929 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 18 Invalid, 58 Unknown, 0 Unchecked, 1.29ms Time], IncrementalHoareTripleChecker [3 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 31.76ms Time] [2021-08-30 19:12:21,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-08-30 19:12:21,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-08-30 19:12:21,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 13 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-30 19:12:21,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 18 transitions. [2021-08-30 19:12:21,881 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 18 transitions. Word has length 11 [2021-08-30 19:12:21,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-30 19:12:21,882 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 18 transitions. [2021-08-30 19:12:21,882 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-30 19:12:21,882 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 18 transitions. [2021-08-30 19:12:21,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-08-30 19:12:21,883 INFO L505 BasicCegarLoop]: Found error trace [2021-08-30 19:12:21,883 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-30 19:12:21,883 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-08-30 19:12:21,883 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0REQUIRES_VIOLATION === [freePointerErr0ASSERT_VIOLATIONMEMORY_FREE, freePointerErr1ASSERT_VIOLATIONMEMORY_FREE, freePointerErr2ASSERT_VIOLATIONMEMORY_FREE (and 3 more)] === [2021-08-30 19:12:21,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-30 19:12:21,884 INFO L82 PathProgramCache]: Analyzing trace with hash 146827991, now seen corresponding path program 1 times [2021-08-30 19:12:21,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-30 19:12:21,885 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942681775] [2021-08-30 19:12:21,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-30 19:12:21,885 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-30 19:12:21,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-30 19:12:21,899 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-30 19:12:21,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-30 19:12:21,925 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-30 19:12:21,925 INFO L627 BasicCegarLoop]: Counterexample is feasible [2021-08-30 19:12:21,926 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location mainErr0REQUIRES_VIOLATION (5 of 6 remaining) [2021-08-30 19:12:21,928 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location freePointerErr0ASSERT_VIOLATIONMEMORY_FREE (4 of 6 remaining) [2021-08-30 19:12:21,928 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location freePointerErr1ASSERT_VIOLATIONMEMORY_FREE (3 of 6 remaining) [2021-08-30 19:12:21,928 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location freePointerErr2ASSERT_VIOLATIONMEMORY_FREE (2 of 6 remaining) [2021-08-30 19:12:21,929 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr1REQUIRES_VIOLATION (1 of 6 remaining) [2021-08-30 19:12:21,929 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr2ENSURES_VIOLATIONMEMORY_LEAK (0 of 6 remaining) [2021-08-30 19:12:21,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-08-30 19:12:21,935 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-30 19:12:21,949 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 30.08 07:12:21 BoogieIcfgContainer [2021-08-30 19:12:21,950 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-30 19:12:21,951 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-30 19:12:21,951 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-30 19:12:21,951 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-30 19:12:21,951 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.08 07:12:20" (3/4) ... [2021-08-30 19:12:21,953 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-08-30 19:12:21,977 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-30 19:12:21,980 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-30 19:12:21,981 INFO L158 Benchmark]: Toolchain (without parser) took 1511.46ms. Allocated memory was 58.7MB in the beginning and 75.5MB in the end (delta: 16.8MB). Free memory was 37.9MB in the beginning and 40.9MB in the end (delta: -3.0MB). Peak memory consumption was 15.2MB. Max. memory is 16.1GB. [2021-08-30 19:12:21,982 INFO L158 Benchmark]: CDTParser took 0.25ms. Allocated memory is still 58.7MB. Free memory is still 41.0MB. There was no memory consumed. Max. memory is 16.1GB. [2021-08-30 19:12:21,983 INFO L158 Benchmark]: CACSL2BoogieTranslator took 189.69ms. Allocated memory is still 58.7MB. Free memory was 37.7MB in the beginning and 29.1MB in the end (delta: 8.7MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-08-30 19:12:21,983 INFO L158 Benchmark]: Boogie Preprocessor took 31.11ms. Allocated memory is still 58.7MB. Free memory was 29.1MB in the beginning and 27.8MB in the end (delta: 1.3MB). There was no memory consumed. Max. memory is 16.1GB. [2021-08-30 19:12:21,983 INFO L158 Benchmark]: RCFGBuilder took 246.23ms. Allocated memory is still 58.7MB. Free memory was 27.8MB in the beginning and 36.5MB in the end (delta: -8.7MB). Peak memory consumption was 7.8MB. Max. memory is 16.1GB. [2021-08-30 19:12:21,984 INFO L158 Benchmark]: TraceAbstraction took 1005.07ms. Allocated memory was 58.7MB in the beginning and 75.5MB in the end (delta: 16.8MB). Free memory was 36.1MB in the beginning and 42.6MB in the end (delta: -6.5MB). Peak memory consumption was 9.5MB. Max. memory is 16.1GB. [2021-08-30 19:12:21,988 INFO L158 Benchmark]: Witness Printer took 30.15ms. Allocated memory is still 75.5MB. Free memory was 42.6MB in the beginning and 40.9MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-08-30 19:12:21,990 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25ms. Allocated memory is still 58.7MB. Free memory is still 41.0MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 189.69ms. Allocated memory is still 58.7MB. Free memory was 37.7MB in the beginning and 29.1MB in the end (delta: 8.7MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Preprocessor took 31.11ms. Allocated memory is still 58.7MB. Free memory was 29.1MB in the beginning and 27.8MB in the end (delta: 1.3MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 246.23ms. Allocated memory is still 58.7MB. Free memory was 27.8MB in the beginning and 36.5MB in the end (delta: -8.7MB). Peak memory consumption was 7.8MB. Max. memory is 16.1GB. * TraceAbstraction took 1005.07ms. Allocated memory was 58.7MB in the beginning and 75.5MB in the end (delta: 16.8MB). Free memory was 36.1MB in the beginning and 42.6MB in the end (delta: -6.5MB). Peak memory consumption was 9.5MB. Max. memory is 16.1GB. * Witness Printer took 30.15ms. Allocated memory is still 75.5MB. Free memory was 42.6MB in the beginning and 40.9MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.00ms ErrorAutomatonConstructionTimeTotal, 0.00ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.00ms ErrorAutomatonConstructionTimeAvg, 0.00ms ErrorAutomatonDifferenceTimeAvg, 0.00ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 14]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L10] int* p = malloc(10 * sizeof(int)); [L12] CALL freePointer(p) VAL [p={-1:0}] [L6] free(p) VAL [p={-1:0}, p={-1:0}] [L6] free(p) VAL [p={-1:0}, p={-1:0}] [L6] free(p) [L12] RET freePointer(p) VAL [p={-1:0}] [L14] p[0] = 1 - UnprovableResult [Line: 6]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 6]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 6]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 14]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 9]: Unable to prove that all allocated memory was freed Unable to prove that all allocated memory was freed Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 6 error locations. Started 1 CEGAR loops. OverallTime: 927.39ms, OverallIterations: 4, TraceHistogramMax: 1, EmptinessCheckTime: 12.06ms, AutomataDifference: 389.06ms, DeadEndRemovalTime: 0.00ms, HoareAnnotationTime: 0.00ms, InitialAbstractionConstructionTime: 12.18ms, PartialOrderReductionTime: 0.00ms, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 49 SdHoareTripleChecker+Valid, 184.43ms IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 47 mSDsluCounter, 52 SdHoareTripleChecker+Invalid, 149.36ms Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 75 mSDsCounter, 12 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 172 IncrementalHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 12 mSolverCounterUnsat, 14 mSDtfsCounter, 172 mSolverCounterSat, 5.88ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 27 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 190.93ms Time, 0.00ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=25occurred in iteration=0, InterpolantAutomatonStates: 21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.00ms DumpTime, AutomataMinimizationStatistics: 19.85ms AutomataMinimizationTime, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 16.21ms SsaConstructionTime, 53.18ms SatisfiabilityAnalysisTime, 255.46ms InterpolantComputationTime, 44 NumberOfCodeBlocks, 44 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 27 ConstructedInterpolants, 0 QuantifiedInterpolants, 96 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 3 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-08-30 19:12:22,031 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request...