/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/list-properties/alternating_list-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:36:18,704 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:36:18,709 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:36:18,739 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:36:18,740 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:36:18,744 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:36:18,747 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:36:18,753 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:36:18,756 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:36:18,758 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:36:18,759 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:36:18,760 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:36:18,761 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:36:18,763 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:36:18,765 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:36:18,767 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:36:18,768 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:36:18,769 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:36:18,772 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:36:18,774 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:36:18,776 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:36:18,779 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:36:18,781 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:36:18,782 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:36:18,786 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 22:36:18,786 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 22:36:18,787 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 22:36:18,788 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 22:36:18,789 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 22:36:18,790 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 22:36:18,790 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 22:36:18,792 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 22:36:18,793 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 22:36:18,794 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 22:36:18,796 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 22:36:18,796 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 22:36:18,797 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 22:36:18,797 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 22:36:18,798 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:36:18,799 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:36:18,803 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:36:18,806 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 22:36:18,829 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:36:18,830 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:36:18,832 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:36:18,833 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:36:18,833 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:36:18,833 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:36:18,834 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:36:18,834 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:36:18,834 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:36:18,835 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:36:18,835 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:36:18,835 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:36:18,835 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:36:18,836 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:36:18,836 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:36:18,836 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:36:18,836 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:36:18,837 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:36:18,837 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:36:18,837 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:36:18,837 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:36:18,838 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:36:18,838 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:36:18,838 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:36:18,838 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:36:18,839 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:36:18,839 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:36:18,839 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:36:18,839 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:36:18,839 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 22:36:19,353 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:36:19,396 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:36:19,403 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:36:19,406 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:36:19,407 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:36:19,408 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-properties/alternating_list-2.i [2020-07-21 22:36:19,518 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4702aa0df/54968b4176cb4dbe81c162b2b2550ece/FLAG9693f8193 [2020-07-21 22:36:20,378 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:36:20,379 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/list-properties/alternating_list-2.i [2020-07-21 22:36:20,400 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4702aa0df/54968b4176cb4dbe81c162b2b2550ece/FLAG9693f8193 [2020-07-21 22:36:20,515 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4702aa0df/54968b4176cb4dbe81c162b2b2550ece [2020-07-21 22:36:20,537 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:36:20,542 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:36:20,548 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:36:20,548 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:36:20,554 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:36:20,556 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:36:20" (1/1) ... [2020-07-21 22:36:20,561 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23500e51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:36:20, skipping insertion in model container [2020-07-21 22:36:20,561 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:36:20" (1/1) ... [2020-07-21 22:36:20,572 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:36:20,626 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:36:21,396 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:36:21,418 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:36:21,474 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:36:21,562 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:36:21,563 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:36:21 WrapperNode [2020-07-21 22:36:21,564 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:36:21,565 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:36:21,566 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:36:21,566 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:36:21,587 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:36:21" (1/1) ... [2020-07-21 22:36:21,591 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:36:21" (1/1) ... [2020-07-21 22:36:21,625 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:36:21" (1/1) ... [2020-07-21 22:36:21,626 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:36:21" (1/1) ... [2020-07-21 22:36:21,650 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:36:21" (1/1) ... [2020-07-21 22:36:21,662 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:36:21" (1/1) ... [2020-07-21 22:36:21,668 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:36:21" (1/1) ... [2020-07-21 22:36:21,679 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:36:21,680 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:36:21,680 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:36:21,681 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:36:21,683 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:36:21" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:36:21,788 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:36:21,789 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:36:21,789 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2020-07-21 22:36:21,789 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2020-07-21 22:36:21,789 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2020-07-21 22:36:21,790 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2020-07-21 22:36:21,790 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2020-07-21 22:36:21,790 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2020-07-21 22:36:21,790 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:36:21,791 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:36:21,791 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:36:21,791 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2020-07-21 22:36:21,791 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2020-07-21 22:36:21,791 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2020-07-21 22:36:21,792 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2020-07-21 22:36:21,792 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2020-07-21 22:36:21,792 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2020-07-21 22:36:21,792 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2020-07-21 22:36:21,793 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2020-07-21 22:36:21,793 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2020-07-21 22:36:21,793 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2020-07-21 22:36:21,793 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2020-07-21 22:36:21,793 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2020-07-21 22:36:21,794 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2020-07-21 22:36:21,794 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2020-07-21 22:36:21,794 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2020-07-21 22:36:21,794 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2020-07-21 22:36:21,794 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2020-07-21 22:36:21,795 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2020-07-21 22:36:21,795 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2020-07-21 22:36:21,795 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2020-07-21 22:36:21,795 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2020-07-21 22:36:21,795 INFO L130 BoogieDeclarations]: Found specification of procedure select [2020-07-21 22:36:21,796 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2020-07-21 22:36:21,796 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2020-07-21 22:36:21,796 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2020-07-21 22:36:21,796 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2020-07-21 22:36:21,796 INFO L130 BoogieDeclarations]: Found specification of procedure random [2020-07-21 22:36:21,796 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2020-07-21 22:36:21,797 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2020-07-21 22:36:21,797 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2020-07-21 22:36:21,797 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2020-07-21 22:36:21,797 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2020-07-21 22:36:21,797 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2020-07-21 22:36:21,798 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2020-07-21 22:36:21,798 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2020-07-21 22:36:21,798 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2020-07-21 22:36:21,798 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2020-07-21 22:36:21,798 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2020-07-21 22:36:21,798 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2020-07-21 22:36:21,799 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2020-07-21 22:36:21,799 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2020-07-21 22:36:21,799 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2020-07-21 22:36:21,799 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2020-07-21 22:36:21,799 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2020-07-21 22:36:21,800 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2020-07-21 22:36:21,800 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2020-07-21 22:36:21,800 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2020-07-21 22:36:21,800 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2020-07-21 22:36:21,800 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2020-07-21 22:36:21,801 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2020-07-21 22:36:21,801 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2020-07-21 22:36:21,801 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2020-07-21 22:36:21,801 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2020-07-21 22:36:21,802 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2020-07-21 22:36:21,802 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2020-07-21 22:36:21,802 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-21 22:36:21,802 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-07-21 22:36:21,802 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2020-07-21 22:36:21,802 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-07-21 22:36:21,803 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2020-07-21 22:36:21,803 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2020-07-21 22:36:21,803 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2020-07-21 22:36:21,803 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2020-07-21 22:36:21,803 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 22:36:21,804 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2020-07-21 22:36:21,804 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2020-07-21 22:36:21,804 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2020-07-21 22:36:21,804 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-07-21 22:36:21,804 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2020-07-21 22:36:21,805 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2020-07-21 22:36:21,805 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2020-07-21 22:36:21,805 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2020-07-21 22:36:21,805 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2020-07-21 22:36:21,805 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2020-07-21 22:36:21,805 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2020-07-21 22:36:21,806 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2020-07-21 22:36:21,806 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2020-07-21 22:36:21,806 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2020-07-21 22:36:21,806 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2020-07-21 22:36:21,806 INFO L130 BoogieDeclarations]: Found specification of procedure system [2020-07-21 22:36:21,807 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2020-07-21 22:36:21,807 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2020-07-21 22:36:21,807 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2020-07-21 22:36:21,807 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2020-07-21 22:36:21,807 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2020-07-21 22:36:21,808 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2020-07-21 22:36:21,808 INFO L130 BoogieDeclarations]: Found specification of procedure div [2020-07-21 22:36:21,808 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2020-07-21 22:36:21,808 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2020-07-21 22:36:21,808 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2020-07-21 22:36:21,808 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2020-07-21 22:36:21,809 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2020-07-21 22:36:21,809 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2020-07-21 22:36:21,809 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2020-07-21 22:36:21,809 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2020-07-21 22:36:21,809 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2020-07-21 22:36:21,809 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2020-07-21 22:36:21,810 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2020-07-21 22:36:21,810 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2020-07-21 22:36:21,810 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2020-07-21 22:36:21,810 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2020-07-21 22:36:21,810 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2020-07-21 22:36:21,810 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2020-07-21 22:36:21,811 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2020-07-21 22:36:21,811 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2020-07-21 22:36:21,811 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2020-07-21 22:36:21,811 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2020-07-21 22:36:21,811 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2020-07-21 22:36:21,811 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:36:21,812 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-21 22:36:21,812 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 22:36:21,812 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-21 22:36:21,812 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-21 22:36:21,812 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 22:36:21,813 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 22:36:21,813 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:36:21,813 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:36:22,356 INFO L728 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2020-07-21 22:36:22,644 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:36:22,644 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 22:36:22,651 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:36:22 BoogieIcfgContainer [2020-07-21 22:36:22,652 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:36:22,655 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:36:22,655 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:36:22,661 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:36:22,662 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:36:20" (1/3) ... [2020-07-21 22:36:22,664 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8c41641 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:36:22, skipping insertion in model container [2020-07-21 22:36:22,664 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:36:21" (2/3) ... [2020-07-21 22:36:22,665 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8c41641 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:36:22, skipping insertion in model container [2020-07-21 22:36:22,665 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:36:22" (3/3) ... [2020-07-21 22:36:22,669 INFO L109 eAbstractionObserver]: Analyzing ICFG alternating_list-2.i [2020-07-21 22:36:22,687 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:36:22,704 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:36:22,731 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:36:22,769 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:36:22,770 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:36:22,770 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:36:22,770 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:36:22,771 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:36:22,771 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:36:22,771 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:36:22,771 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:36:22,804 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-07-21 22:36:22,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 22:36:22,816 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:36:22,817 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:36:22,819 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:36:22,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:36:22,828 INFO L82 PathProgramCache]: Analyzing trace with hash 209903222, now seen corresponding path program 1 times [2020-07-21 22:36:22,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:36:22,838 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [350871491] [2020-07-21 22:36:22,839 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:36:23,078 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:36:23,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:36:23,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 22:36:23,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:36:23,138 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:36:23,139 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:36:23,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [350871491] [2020-07-21 22:36:23,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:36:23,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 22:36:23,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289939562] [2020-07-21 22:36:23,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 22:36:23,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:36:23,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 22:36:23,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 22:36:23,194 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 2 states. [2020-07-21 22:36:23,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:36:23,248 INFO L93 Difference]: Finished difference Result 52 states and 69 transitions. [2020-07-21 22:36:23,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 22:36:23,251 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2020-07-21 22:36:23,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:36:23,267 INFO L225 Difference]: With dead ends: 52 [2020-07-21 22:36:23,267 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 22:36:23,275 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 22:36:23,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 22:36:23,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-21 22:36:23,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-21 22:36:23,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-07-21 22:36:23,352 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 15 [2020-07-21 22:36:23,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:36:23,354 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-07-21 22:36:23,354 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 22:36:23,355 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-07-21 22:36:23,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 22:36:23,356 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:36:23,357 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:36:23,572 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:36:23,573 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:36:23,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:36:23,574 INFO L82 PathProgramCache]: Analyzing trace with hash 919137993, now seen corresponding path program 1 times [2020-07-21 22:36:23,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:36:23,612 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2066638881] [2020-07-21 22:36:23,613 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:36:23,862 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:36:23,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:36:23,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 22:36:23,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:36:23,962 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:36:23,963 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:36:23,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2066638881] [2020-07-21 22:36:23,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:36:23,965 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 22:36:23,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080844055] [2020-07-21 22:36:23,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 22:36:23,975 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:36:23,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 22:36:23,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:36:23,978 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 3 states. [2020-07-21 22:36:24,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:36:24,044 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2020-07-21 22:36:24,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 22:36:24,046 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-21 22:36:24,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:36:24,049 INFO L225 Difference]: With dead ends: 51 [2020-07-21 22:36:24,050 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 22:36:24,061 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 22:36:24,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 22:36:24,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2020-07-21 22:36:24,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 22:36:24,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2020-07-21 22:36:24,090 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 16 [2020-07-21 22:36:24,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:36:24,093 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2020-07-21 22:36:24,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 22:36:24,093 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2020-07-21 22:36:24,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 22:36:24,094 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:36:24,095 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:36:24,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:36:24,312 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:36:24,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:36:24,313 INFO L82 PathProgramCache]: Analyzing trace with hash 919131049, now seen corresponding path program 1 times [2020-07-21 22:36:24,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:36:24,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [12723224] [2020-07-21 22:36:24,315 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:36:24,471 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:36:24,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:36:24,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:36:24,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:36:24,588 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2020-07-21 22:36:24,589 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-21 22:36:24,599 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-21 22:36:24,600 INFO L544 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-21 22:36:24,601 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:11, output treesize:7 [2020-07-21 22:36:24,645 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2020-07-21 22:36:24,647 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-21 22:36:24,652 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-21 22:36:24,653 INFO L544 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-21 22:36:24,654 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:15, output treesize:3 [2020-07-21 22:36:24,666 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:36:24,667 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:36:24,667 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [12723224] [2020-07-21 22:36:24,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:36:24,668 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:36:24,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492432204] [2020-07-21 22:36:24,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:36:24,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:36:24,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:36:24,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:36:24,672 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand 5 states. [2020-07-21 22:36:24,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:36:24,820 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2020-07-21 22:36:24,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:36:24,821 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-07-21 22:36:24,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:36:24,823 INFO L225 Difference]: With dead ends: 61 [2020-07-21 22:36:24,823 INFO L226 Difference]: Without dead ends: 46 [2020-07-21 22:36:24,825 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-07-21 22:36:24,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-07-21 22:36:24,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 35. [2020-07-21 22:36:24,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 22:36:24,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2020-07-21 22:36:24,837 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 16 [2020-07-21 22:36:24,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:36:24,838 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2020-07-21 22:36:24,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:36:24,839 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2020-07-21 22:36:24,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 22:36:24,840 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:36:24,840 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:36:25,055 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:36:25,058 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:36:25,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:36:25,059 INFO L82 PathProgramCache]: Analyzing trace with hash 1446652468, now seen corresponding path program 1 times [2020-07-21 22:36:25,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:36:25,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1630085085] [2020-07-21 22:36:25,061 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:36:25,288 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:36:25,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 22:36:25,289 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 22:36:25,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 22:36:25,321 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 22:36:25,365 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 22:36:25,366 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 22:36:25,580 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:36:25,631 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:36:25 BoogieIcfgContainer [2020-07-21 22:36:25,632 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 22:36:25,635 INFO L168 Benchmark]: Toolchain (without parser) took 5095.45 ms. Allocated memory was 140.5 MB in the beginning and 222.8 MB in the end (delta: 82.3 MB). Free memory was 97.0 MB in the beginning and 83.3 MB in the end (delta: 13.6 MB). Peak memory consumption was 95.9 MB. Max. memory is 7.1 GB. [2020-07-21 22:36:25,637 INFO L168 Benchmark]: CDTParser took 1.01 ms. Allocated memory is still 140.5 MB. Free memory is still 116.3 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 22:36:25,638 INFO L168 Benchmark]: CACSL2BoogieTranslator took 1017.19 ms. Allocated memory was 140.5 MB in the beginning and 199.8 MB in the end (delta: 59.2 MB). Free memory was 97.0 MB in the beginning and 166.8 MB in the end (delta: -69.8 MB). Peak memory consumption was 22.9 MB. Max. memory is 7.1 GB. [2020-07-21 22:36:25,640 INFO L168 Benchmark]: Boogie Preprocessor took 114.14 ms. Allocated memory is still 199.8 MB. Free memory was 166.8 MB in the beginning and 163.6 MB in the end (delta: 3.2 MB). Peak memory consumption was 3.2 MB. Max. memory is 7.1 GB. [2020-07-21 22:36:25,641 INFO L168 Benchmark]: RCFGBuilder took 972.15 ms. Allocated memory is still 199.8 MB. Free memory was 163.6 MB in the beginning and 118.9 MB in the end (delta: 44.7 MB). Peak memory consumption was 44.7 MB. Max. memory is 7.1 GB. [2020-07-21 22:36:25,642 INFO L168 Benchmark]: TraceAbstraction took 2977.52 ms. Allocated memory was 199.8 MB in the beginning and 222.8 MB in the end (delta: 23.1 MB). Free memory was 118.9 MB in the beginning and 83.3 MB in the end (delta: 35.5 MB). Peak memory consumption was 58.6 MB. Max. memory is 7.1 GB. [2020-07-21 22:36:25,647 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.01 ms. Allocated memory is still 140.5 MB. Free memory is still 116.3 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 1017.19 ms. Allocated memory was 140.5 MB in the beginning and 199.8 MB in the end (delta: 59.2 MB). Free memory was 97.0 MB in the beginning and 166.8 MB in the end (delta: -69.8 MB). Peak memory consumption was 22.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 114.14 ms. Allocated memory is still 199.8 MB. Free memory was 166.8 MB in the beginning and 163.6 MB in the end (delta: 3.2 MB). Peak memory consumption was 3.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 972.15 ms. Allocated memory is still 199.8 MB. Free memory was 163.6 MB in the beginning and 118.9 MB in the end (delta: 44.7 MB). Peak memory consumption was 44.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2977.52 ms. Allocated memory was 199.8 MB in the beginning and 222.8 MB in the end (delta: 23.1 MB). Free memory was 118.9 MB in the beginning and 83.3 MB in the end (delta: 35.5 MB). Peak memory consumption was 58.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 562]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L521] int flag = 1; [L522] List a = (List) malloc(sizeof(struct node)); VAL [a={-1:0}, flag=1, malloc(sizeof(struct node))={-1:0}] [L523] COND FALSE !(a == 0) VAL [a={-1:0}, flag=1, malloc(sizeof(struct node))={-1:0}] [L524] List t; [L525] List p = a; VAL [a={-1:0}, flag=1, malloc(sizeof(struct node))={-1:0}, p={-1:0}] [L526] COND TRUE __VERIFIER_nondet_int() [L527] COND TRUE \read(flag) [L528] p->h = 2 [L529] flag = 0 VAL [a={-1:0}, flag=0, malloc(sizeof(struct node))={-1:0}, p={-1:0}] [L534] t = (List) malloc(sizeof(struct node)) VAL [a={-1:0}, flag=0, malloc(sizeof(struct node))={-2:0}, malloc(sizeof(struct node))={-1:0}, p={-1:0}, t={-2:0}] [L535] COND FALSE !(t == 0) VAL [a={-1:0}, flag=0, malloc(sizeof(struct node))={-2:0}, malloc(sizeof(struct node))={-1:0}, p={-1:0}, t={-2:0}] [L536] p->n = t [L537] EXPR p->n [L537] p = p->n [L526] COND FALSE !(__VERIFIER_nondet_int()) [L539] p->h = 3 [L540] p = a [L541] flag = 1 VAL [a={-1:0}, flag=1, malloc(sizeof(struct node))={-2:0}, malloc(sizeof(struct node))={-1:0}, p={-1:0}, t={-2:0}] [L542] EXPR p->h VAL [a={-1:0}, flag=1, malloc(sizeof(struct node))={-2:0}, malloc(sizeof(struct node))={-1:0}, p={-1:0}, p->h=2, t={-2:0}] [L542] COND TRUE p->h != 3 [L543] COND TRUE \read(flag) [L544] flag = 0 [L545] EXPR p->h VAL [a={-1:0}, flag=0, malloc(sizeof(struct node))={-2:0}, malloc(sizeof(struct node))={-1:0}, p={-1:0}, p->h=2, t={-2:0}] [L545] COND TRUE p->h != 1 [L562] __VERIFIER_error() VAL [a={-1:0}, flag=0, malloc(sizeof(struct node))={-2:0}, malloc(sizeof(struct node))={-1:0}, p={-1:0}, t={-2:0}] - StatisticsResult: Ultimate Automizer benchmark data CFG has 9 procedures, 51 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.8s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 93 SDtfs, 24 SDslu, 71 SDs, 0 SdLazy, 35 SolverSat, 6 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 46 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=35occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 14 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 69 NumberOfCodeBlocks, 66 NumberOfCodeBlocksAsserted, 15 NumberOfCheckSat, 44 ConstructedInterpolants, 0 QuantifiedInterpolants, 1126 SizeOfPredicates, 5 NumberOfNonLiveVariables, 213 ConjunctsInSsa, 15 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! Received shutdown request...