/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 NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/list-ext3-properties/sll_length_check-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:23:54,634 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:23:54,637 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:23:54,655 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:23:54,656 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:23:54,658 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:23:54,660 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:23:54,670 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:23:54,674 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:23:54,677 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:23:54,678 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:23:54,680 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:23:54,680 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:23:54,682 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:23:54,684 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:23:54,685 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:23:54,687 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:23:54,688 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:23:54,689 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:23:54,694 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:23:54,698 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:23:54,702 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:23:54,703 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:23:54,704 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:23:54,706 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 11:23:54,706 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 11:23:54,706 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 11:23:54,709 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 11:23:54,709 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 11:23:54,711 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 11:23:54,712 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 11:23:54,713 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 11:23:54,713 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 11:23:54,714 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 11:23:54,715 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 11:23:54,715 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 11:23:54,716 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 11:23:54,716 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 11:23:54,717 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:23:54,717 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:23:54,719 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:23:54,720 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 11:23:54,755 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:23:54,755 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:23:54,759 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:23:54,760 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:23:54,760 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:23:54,760 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:23:54,760 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:23:54,760 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:23:54,761 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:23:54,761 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:23:54,761 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:23:54,761 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:23:54,761 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:23:54,762 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:23:54,762 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:23:54,762 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:23:54,762 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:23:54,762 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:23:54,762 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:23:54,763 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:23:54,763 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:23:54,763 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:23:54,763 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:23:54,763 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:23:54,764 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:23:54,764 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:23:54,764 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:23:54,764 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:23:54,764 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:23:54,765 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 -> NOT_INCREMENTALLY [2020-07-21 11:23:55,068 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:23:55,080 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:23:55,084 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:23:55,085 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:23:55,086 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:23:55,086 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-ext3-properties/sll_length_check-1.i [2020-07-21 11:23:55,148 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3e982b257/ae6fcbb08fcf44cea37923edee48fb9e/FLAGf2596ffd8 [2020-07-21 11:23:55,659 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:23:55,660 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/list-ext3-properties/sll_length_check-1.i [2020-07-21 11:23:55,673 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3e982b257/ae6fcbb08fcf44cea37923edee48fb9e/FLAGf2596ffd8 [2020-07-21 11:23:55,993 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3e982b257/ae6fcbb08fcf44cea37923edee48fb9e [2020-07-21 11:23:56,001 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:23:56,004 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:23:56,005 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:23:56,005 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:23:56,008 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:23:56,009 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:23:55" (1/1) ... [2020-07-21 11:23:56,012 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1b2dd593 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:23:56, skipping insertion in model container [2020-07-21 11:23:56,012 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:23:55" (1/1) ... [2020-07-21 11:23:56,020 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:23:56,067 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:23:56,444 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:23:56,455 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:23:56,537 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:23:56,600 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:23:56,601 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:23:56 WrapperNode [2020-07-21 11:23:56,601 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:23:56,602 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:23:56,602 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:23:56,602 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:23:56,615 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:23:56" (1/1) ... [2020-07-21 11:23:56,617 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:23:56" (1/1) ... [2020-07-21 11:23:56,635 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:23:56" (1/1) ... [2020-07-21 11:23:56,635 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:23:56" (1/1) ... [2020-07-21 11:23:56,650 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:23:56" (1/1) ... [2020-07-21 11:23:56,656 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:23:56" (1/1) ... [2020-07-21 11:23:56,659 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:23:56" (1/1) ... [2020-07-21 11:23:56,668 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:23:56,669 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:23:56,669 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:23:56,669 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:23:56,670 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:23:56" (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 11:23:56,737 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:23:56,737 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:23:56,737 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2020-07-21 11:23:56,737 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2020-07-21 11:23:56,737 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2020-07-21 11:23:56,738 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_create [2020-07-21 11:23:56,738 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_length [2020-07-21 11:23:56,738 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_destroy [2020-07-21 11:23:56,738 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:23:56,738 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:23:56,738 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 11:23:56,739 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2020-07-21 11:23:56,739 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2020-07-21 11:23:56,739 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2020-07-21 11:23:56,739 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2020-07-21 11:23:56,741 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2020-07-21 11:23:56,741 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2020-07-21 11:23:56,741 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2020-07-21 11:23:56,741 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2020-07-21 11:23:56,741 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2020-07-21 11:23:56,741 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2020-07-21 11:23:56,742 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2020-07-21 11:23:56,742 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2020-07-21 11:23:56,742 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2020-07-21 11:23:56,743 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2020-07-21 11:23:56,743 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2020-07-21 11:23:56,743 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2020-07-21 11:23:56,744 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2020-07-21 11:23:56,744 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2020-07-21 11:23:56,744 INFO L130 BoogieDeclarations]: Found specification of procedure select [2020-07-21 11:23:56,744 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2020-07-21 11:23:56,744 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2020-07-21 11:23:56,744 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2020-07-21 11:23:56,744 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2020-07-21 11:23:56,745 INFO L130 BoogieDeclarations]: Found specification of procedure random [2020-07-21 11:23:56,745 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2020-07-21 11:23:56,745 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2020-07-21 11:23:56,745 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2020-07-21 11:23:56,746 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2020-07-21 11:23:56,746 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2020-07-21 11:23:56,746 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2020-07-21 11:23:56,746 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2020-07-21 11:23:56,746 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2020-07-21 11:23:56,746 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2020-07-21 11:23:56,746 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2020-07-21 11:23:56,747 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2020-07-21 11:23:56,747 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2020-07-21 11:23:56,747 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2020-07-21 11:23:56,747 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2020-07-21 11:23:56,747 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2020-07-21 11:23:56,747 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2020-07-21 11:23:56,747 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2020-07-21 11:23:56,748 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2020-07-21 11:23:56,748 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2020-07-21 11:23:56,748 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2020-07-21 11:23:56,748 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2020-07-21 11:23:56,748 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2020-07-21 11:23:56,748 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2020-07-21 11:23:56,748 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2020-07-21 11:23:56,749 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2020-07-21 11:23:56,749 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2020-07-21 11:23:56,749 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2020-07-21 11:23:56,750 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2020-07-21 11:23:56,750 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-21 11:23:56,750 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-07-21 11:23:56,750 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2020-07-21 11:23:56,750 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-07-21 11:23:56,751 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2020-07-21 11:23:56,751 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2020-07-21 11:23:56,751 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2020-07-21 11:23:56,751 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2020-07-21 11:23:56,752 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2020-07-21 11:23:56,753 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 11:23:56,753 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2020-07-21 11:23:56,753 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2020-07-21 11:23:56,753 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2020-07-21 11:23:56,754 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-07-21 11:23:56,754 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2020-07-21 11:23:56,755 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2020-07-21 11:23:56,755 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2020-07-21 11:23:56,755 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2020-07-21 11:23:56,756 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2020-07-21 11:23:56,756 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2020-07-21 11:23:56,757 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2020-07-21 11:23:56,757 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2020-07-21 11:23:56,757 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2020-07-21 11:23:56,758 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2020-07-21 11:23:56,758 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2020-07-21 11:23:56,759 INFO L130 BoogieDeclarations]: Found specification of procedure system [2020-07-21 11:23:56,759 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2020-07-21 11:23:56,759 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2020-07-21 11:23:56,759 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2020-07-21 11:23:56,759 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2020-07-21 11:23:56,759 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2020-07-21 11:23:56,759 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2020-07-21 11:23:56,760 INFO L130 BoogieDeclarations]: Found specification of procedure div [2020-07-21 11:23:56,760 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2020-07-21 11:23:56,760 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2020-07-21 11:23:56,760 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2020-07-21 11:23:56,760 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2020-07-21 11:23:56,760 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2020-07-21 11:23:56,760 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2020-07-21 11:23:56,761 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2020-07-21 11:23:56,761 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2020-07-21 11:23:56,761 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2020-07-21 11:23:56,761 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2020-07-21 11:23:56,761 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2020-07-21 11:23:56,761 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2020-07-21 11:23:56,761 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2020-07-21 11:23:56,762 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2020-07-21 11:23:56,762 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2020-07-21 11:23:56,762 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2020-07-21 11:23:56,762 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2020-07-21 11:23:56,762 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2020-07-21 11:23:56,762 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2020-07-21 11:23:56,763 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2020-07-21 11:23:56,763 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2020-07-21 11:23:56,764 INFO L130 BoogieDeclarations]: Found specification of procedure sll_create [2020-07-21 11:23:56,764 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-21 11:23:56,764 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-21 11:23:56,765 INFO L130 BoogieDeclarations]: Found specification of procedure sll_length [2020-07-21 11:23:56,765 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-21 11:23:56,765 INFO L130 BoogieDeclarations]: Found specification of procedure sll_destroy [2020-07-21 11:23:56,765 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 11:23:56,765 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:23:56,765 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:23:56,766 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:23:57,068 INFO L728 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2020-07-21 11:23:57,329 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:23:57,329 INFO L295 CfgBuilder]: Removed 4 assume(true) statements. [2020-07-21 11:23:57,333 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:23:57 BoogieIcfgContainer [2020-07-21 11:23:57,333 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:23:57,335 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:23:57,335 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:23:57,338 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:23:57,339 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:23:55" (1/3) ... [2020-07-21 11:23:57,340 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25bbf2a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:23:57, skipping insertion in model container [2020-07-21 11:23:57,340 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:23:56" (2/3) ... [2020-07-21 11:23:57,340 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25bbf2a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:23:57, skipping insertion in model container [2020-07-21 11:23:57,341 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:23:57" (3/3) ... [2020-07-21 11:23:57,342 INFO L109 eAbstractionObserver]: Analyzing ICFG sll_length_check-1.i [2020-07-21 11:23:57,353 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:23:57,361 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:23:57,375 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:23:57,399 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:23:57,400 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:23:57,400 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:23:57,400 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:23:57,400 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:23:57,401 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:23:57,401 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:23:57,401 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:23:57,420 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2020-07-21 11:23:57,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 11:23:57,425 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:23:57,426 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:23:57,427 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:23:57,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:23:57,432 INFO L82 PathProgramCache]: Analyzing trace with hash -1666427650, now seen corresponding path program 1 times [2020-07-21 11:23:57,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:23:57,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [197798436] [2020-07-21 11:23:57,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:23:57,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:23:57,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 11:23:57,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:23:57,660 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 11:23:57,661 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:23:57,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [197798436] [2020-07-21 11:23:57,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:23:57,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 11:23:57,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085384467] [2020-07-21 11:23:57,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 11:23:57,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:23:57,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 11:23:57,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 11:23:57,688 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2020-07-21 11:23:57,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:23:57,716 INFO L93 Difference]: Finished difference Result 73 states and 93 transitions. [2020-07-21 11:23:57,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 11:23:57,718 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 23 [2020-07-21 11:23:57,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:23:57,727 INFO L225 Difference]: With dead ends: 73 [2020-07-21 11:23:57,727 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 11:23:57,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 22 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 11:23:57,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 11:23:57,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 11:23:57,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 11:23:57,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-07-21 11:23:57,772 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 23 [2020-07-21 11:23:57,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:23:57,773 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-07-21 11:23:57,773 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 11:23:57,773 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-07-21 11:23:57,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 11:23:57,774 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:23:57,775 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:23:57,988 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:23:57,988 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:23:57,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:23:57,989 INFO L82 PathProgramCache]: Analyzing trace with hash -29727073, now seen corresponding path program 1 times [2020-07-21 11:23:57,989 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:23:57,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [244701761] [2020-07-21 11:23:57,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:23:58,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:23:58,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 11:23:58,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:23:58,163 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 11:23:58,164 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:23:58,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [244701761] [2020-07-21 11:23:58,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:23:58,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 11:23:58,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026034409] [2020-07-21 11:23:58,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 11:23:58,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:23:58,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 11:23:58,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 11:23:58,168 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 5 states. [2020-07-21 11:23:58,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:23:58,220 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2020-07-21 11:23:58,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 11:23:58,220 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2020-07-21 11:23:58,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:23:58,222 INFO L225 Difference]: With dead ends: 45 [2020-07-21 11:23:58,222 INFO L226 Difference]: Without dead ends: 31 [2020-07-21 11:23:58,223 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 11:23:58,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-21 11:23:58,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2020-07-21 11:23:58,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 11:23:58,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-07-21 11:23:58,230 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 25 [2020-07-21 11:23:58,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:23:58,231 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-07-21 11:23:58,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 11:23:58,231 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-07-21 11:23:58,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 11:23:58,232 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:23:58,232 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:23:58,446 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:23:58,447 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:23:58,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:23:58,447 INFO L82 PathProgramCache]: Analyzing trace with hash -1680455870, now seen corresponding path program 1 times [2020-07-21 11:23:58,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:23:58,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1381244863] [2020-07-21 11:23:58,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:23:58,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:23:58,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 11:23:58,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:23:58,596 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:23:58,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:23:58,701 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:23:58,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1381244863] [2020-07-21 11:23:58,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:23:58,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-07-21 11:23:58,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451484092] [2020-07-21 11:23:58,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 11:23:58,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:23:58,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 11:23:58,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 11:23:58,704 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 9 states. [2020-07-21 11:23:58,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:23:58,766 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2020-07-21 11:23:58,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 11:23:58,766 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-07-21 11:23:58,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:23:58,768 INFO L225 Difference]: With dead ends: 48 [2020-07-21 11:23:58,768 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 11:23:58,769 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-07-21 11:23:58,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 11:23:58,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-07-21 11:23:58,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 11:23:58,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-21 11:23:58,775 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 28 [2020-07-21 11:23:58,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:23:58,776 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-21 11:23:58,776 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 11:23:58,776 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-21 11:23:58,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 11:23:58,777 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:23:58,777 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:23:58,992 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:23:58,992 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:23:58,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:23:58,993 INFO L82 PathProgramCache]: Analyzing trace with hash -1166508097, now seen corresponding path program 2 times [2020-07-21 11:23:58,994 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:23:58,994 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1895876835] [2020-07-21 11:23:58,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:23:59,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:23:59,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 11:23:59,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:23:59,196 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:23:59,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:23:59,341 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:23:59,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1895876835] [2020-07-21 11:23:59,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:23:59,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 11:23:59,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579145803] [2020-07-21 11:23:59,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 11:23:59,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:23:59,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 11:23:59,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-07-21 11:23:59,346 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 10 states. [2020-07-21 11:23:59,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:23:59,403 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2020-07-21 11:23:59,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 11:23:59,404 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2020-07-21 11:23:59,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:23:59,405 INFO L225 Difference]: With dead ends: 51 [2020-07-21 11:23:59,405 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 11:23:59,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 50 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2020-07-21 11:23:59,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 11:23:59,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 11:23:59,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 11:23:59,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2020-07-21 11:23:59,412 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 31 [2020-07-21 11:23:59,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:23:59,412 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2020-07-21 11:23:59,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 11:23:59,412 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2020-07-21 11:23:59,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 11:23:59,413 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:23:59,413 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:23:59,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:23:59,626 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:23:59,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:23:59,626 INFO L82 PathProgramCache]: Analyzing trace with hash -1706812894, now seen corresponding path program 3 times [2020-07-21 11:23:59,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:23:59,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [128976969] [2020-07-21 11:23:59,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:23:59,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:23:59,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 11:23:59,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:23:59,795 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 11:23:59,796 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:23:59,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [128976969] [2020-07-21 11:23:59,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:23:59,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-07-21 11:23:59,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821956286] [2020-07-21 11:23:59,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 11:23:59,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:23:59,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 11:23:59,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-07-21 11:23:59,798 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand 10 states. [2020-07-21 11:23:59,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:23:59,908 INFO L93 Difference]: Finished difference Result 43 states and 46 transitions. [2020-07-21 11:23:59,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 11:23:59,908 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 34 [2020-07-21 11:23:59,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:23:59,909 INFO L225 Difference]: With dead ends: 43 [2020-07-21 11:23:59,910 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 11:23:59,910 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2020-07-21 11:23:59,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 11:23:59,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 11:23:59,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 11:23:59,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2020-07-21 11:23:59,916 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 34 [2020-07-21 11:23:59,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:23:59,916 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2020-07-21 11:23:59,917 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 11:23:59,917 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2020-07-21 11:23:59,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-07-21 11:23:59,918 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:23:59,918 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:24:00,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:24:00,132 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:24:00,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:24:00,133 INFO L82 PathProgramCache]: Analyzing trace with hash 991320762, now seen corresponding path program 1 times [2020-07-21 11:24:00,133 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:24:00,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [147443848] [2020-07-21 11:24:00,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:24:00,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:24:00,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 40 conjunts are in the unsatisfiable core [2020-07-21 11:24:00,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:24:00,311 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 11:24:00,312 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-21 11:24:00,325 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-21 11:24:00,326 INFO L544 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-21 11:24:00,326 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:19, output treesize:12 [2020-07-21 11:24:00,472 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:24:00,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:24:00,755 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:24:00,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [147443848] [2020-07-21 11:24:00,758 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:24:00,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 21 [2020-07-21 11:24:00,758 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506815541] [2020-07-21 11:24:00,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 11:24:00,759 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:24:00,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 11:24:00,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 11:24:00,760 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand 21 states. [2020-07-21 11:24:03,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:24:03,061 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2020-07-21 11:24:03,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 11:24:03,062 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 35 [2020-07-21 11:24:03,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:24:03,063 INFO L225 Difference]: With dead ends: 44 [2020-07-21 11:24:03,063 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 11:24:03,066 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=103, Invalid=547, Unknown=0, NotChecked=0, Total=650 [2020-07-21 11:24:03,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 11:24:03,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-07-21 11:24:03,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-21 11:24:03,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2020-07-21 11:24:03,078 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 35 [2020-07-21 11:24:03,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:24:03,078 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2020-07-21 11:24:03,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 11:24:03,079 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2020-07-21 11:24:03,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-07-21 11:24:03,082 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:24:03,083 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:24:03,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:24:03,297 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:24:03,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:24:03,298 INFO L82 PathProgramCache]: Analyzing trace with hash -1265881822, now seen corresponding path program 2 times [2020-07-21 11:24:03,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:24:03,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1348390090] [2020-07-21 11:24:03,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:24:03,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:24:03,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 11:24:03,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:24:03,443 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 11:24:03,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:24:03,496 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 11:24:03,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1348390090] [2020-07-21 11:24:03,497 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:24:03,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-07-21 11:24:03,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910320728] [2020-07-21 11:24:03,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 11:24:03,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:24:03,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 11:24:03,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-21 11:24:03,498 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 9 states. [2020-07-21 11:24:03,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:24:03,583 INFO L93 Difference]: Finished difference Result 55 states and 62 transitions. [2020-07-21 11:24:03,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 11:24:03,584 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-07-21 11:24:03,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:24:03,587 INFO L225 Difference]: With dead ends: 55 [2020-07-21 11:24:03,587 INFO L226 Difference]: Without dead ends: 51 [2020-07-21 11:24:03,588 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-07-21 11:24:03,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-07-21 11:24:03,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 47. [2020-07-21 11:24:03,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-21 11:24:03,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-07-21 11:24:03,600 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 36 [2020-07-21 11:24:03,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:24:03,601 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-07-21 11:24:03,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 11:24:03,601 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-07-21 11:24:03,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 11:24:03,603 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:24:03,603 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:24:03,810 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:24:03,811 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:24:03,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:24:03,812 INFO L82 PathProgramCache]: Analyzing trace with hash 1775282106, now seen corresponding path program 3 times [2020-07-21 11:24:03,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:24:03,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [288604923] [2020-07-21 11:24:03,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:24:03,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:24:03,914 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:24:03,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:24:03,937 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:24:03,968 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 11:24:03,969 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 11:24:04,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:24:04,219 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 11:24:04 BoogieIcfgContainer [2020-07-21 11:24:04,219 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 11:24:04,221 INFO L168 Benchmark]: Toolchain (without parser) took 8217.98 ms. Allocated memory was 140.0 MB in the beginning and 272.6 MB in the end (delta: 132.6 MB). Free memory was 103.2 MB in the beginning and 161.8 MB in the end (delta: -58.6 MB). Peak memory consumption was 74.0 MB. Max. memory is 7.1 GB. [2020-07-21 11:24:04,222 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 140.0 MB. Free memory was 123.1 MB in the beginning and 122.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 11:24:04,223 INFO L168 Benchmark]: CACSL2BoogieTranslator took 596.58 ms. Allocated memory was 140.0 MB in the beginning and 205.0 MB in the end (delta: 65.0 MB). Free memory was 103.0 MB in the beginning and 169.9 MB in the end (delta: -66.9 MB). Peak memory consumption was 24.7 MB. Max. memory is 7.1 GB. [2020-07-21 11:24:04,223 INFO L168 Benchmark]: Boogie Preprocessor took 66.67 ms. Allocated memory is still 205.0 MB. Free memory was 169.9 MB in the beginning and 167.3 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 7.1 GB. [2020-07-21 11:24:04,224 INFO L168 Benchmark]: RCFGBuilder took 664.94 ms. Allocated memory is still 205.0 MB. Free memory was 166.6 MB in the beginning and 123.4 MB in the end (delta: 43.2 MB). Peak memory consumption was 43.2 MB. Max. memory is 7.1 GB. [2020-07-21 11:24:04,225 INFO L168 Benchmark]: TraceAbstraction took 6884.29 ms. Allocated memory was 205.0 MB in the beginning and 272.6 MB in the end (delta: 67.6 MB). Free memory was 123.4 MB in the beginning and 161.8 MB in the end (delta: -38.4 MB). Peak memory consumption was 29.2 MB. Max. memory is 7.1 GB. [2020-07-21 11:24:04,229 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 140.0 MB. Free memory was 123.1 MB in the beginning and 122.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 596.58 ms. Allocated memory was 140.0 MB in the beginning and 205.0 MB in the end (delta: 65.0 MB). Free memory was 103.0 MB in the beginning and 169.9 MB in the end (delta: -66.9 MB). Peak memory consumption was 24.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 66.67 ms. Allocated memory is still 205.0 MB. Free memory was 169.9 MB in the beginning and 167.3 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 664.94 ms. Allocated memory is still 205.0 MB. Free memory was 166.6 MB in the beginning and 123.4 MB in the end (delta: 43.2 MB). Peak memory consumption was 43.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6884.29 ms. Allocated memory was 205.0 MB in the beginning and 272.6 MB in the end (delta: 67.6 MB). Free memory was 123.4 MB in the beginning and 161.8 MB in the end (delta: -38.4 MB). Peak memory consumption was 29.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 602]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L592] int len = 2; VAL [len=2] [L593] len < 32 && __VERIFIER_nondet_int() [L593] len < 32 && __VERIFIER_nondet_int() VAL [__VERIFIER_nondet_int()=0, len=2, len < 32 && __VERIFIER_nondet_int()=0] [L593] COND FALSE !(len < 32 && __VERIFIER_nondet_int()) [L596] CALL, EXPR sll_create(len + 1) VAL [\old(len)=3] [L564] SLL head = ((void *)0); VAL [\old(len)=3, head={0:0}, len=3] [L565] COND TRUE len > 0 [L566] SLL new_head = (SLL) malloc(sizeof(struct node)); VAL [\old(len)=3, head={0:0}, len=3, malloc(sizeof(struct node))={-1:0}, new_head={-1:0}] [L567] COND FALSE !(((void *)0) == new_head) VAL [\old(len)=3, head={0:0}, len=3, malloc(sizeof(struct node))={-1:0}, new_head={-1:0}] [L570] new_head->next = head [L571] head = new_head [L572] len-- VAL [\old(len)=3, head={-1:0}, len=2, malloc(sizeof(struct node))={-1:0}, new_head={-1:0}] [L565] COND TRUE len > 0 [L566] SLL new_head = (SLL) malloc(sizeof(struct node)); VAL [\old(len)=3, head={-1:0}, len=2, malloc(sizeof(struct node))={31892:0}, new_head={31892:0}] [L567] COND FALSE !(((void *)0) == new_head) VAL [\old(len)=3, head={-1:0}, len=2, malloc(sizeof(struct node))={31892:0}, new_head={31892:0}] [L570] new_head->next = head [L571] head = new_head [L572] len-- VAL [\old(len)=3, head={31892:0}, len=1, malloc(sizeof(struct node))={31892:0}, new_head={31892:0}] [L565] COND TRUE len > 0 [L566] SLL new_head = (SLL) malloc(sizeof(struct node)); VAL [\old(len)=3, head={31892:0}, len=1, malloc(sizeof(struct node))={31893:0}, new_head={31893:0}] [L567] COND FALSE !(((void *)0) == new_head) VAL [\old(len)=3, head={31892:0}, len=1, malloc(sizeof(struct node))={31893:0}, new_head={31893:0}] [L570] new_head->next = head [L571] head = new_head [L572] len-- VAL [\old(len)=3, head={31893:0}, len=0, malloc(sizeof(struct node))={31893:0}, new_head={31893:0}] [L565] COND FALSE !(len > 0) VAL [\old(len)=3, head={31893:0}, len=0, malloc(sizeof(struct node))={31893:0}, new_head={31893:0}] [L574] return head; VAL [\old(len)=3, \result={31893:0}, head={31893:0}, len=0, malloc(sizeof(struct node))={31893:0}, new_head={31893:0}] [L596] RET, EXPR sll_create(len + 1) VAL [len=2, sll_create(len + 1)={31893:0}] [L596] SLL s = sll_create(len + 1); [L597] CALL, EXPR sll_length(s) VAL [head={31893:0}] [L577] int len = 0; VAL [head={31893:0}, head={31893:0}, len=0] [L578] COND TRUE \read(head) [L579] len++ [L580] EXPR head->next [L580] head = head->next [L578] COND TRUE \read(head) [L579] len++ [L580] EXPR head->next [L580] head = head->next [L578] COND TRUE \read(head) [L579] len++ [L580] EXPR head->next [L580] head = head->next [L578] COND FALSE !(\read(head)) VAL [head={31893:0}, head={0:0}, len=3] [L582] return len; VAL [\result=3, head={31893:0}, head={0:0}, len=3] [L597] RET, EXPR sll_length(s) VAL [len=2, s={31893:0}, sll_length(s)=3] [L597] COND TRUE len != sll_length(s) [L602] __VERIFIER_error() VAL [len=2, s={31893:0}] - StatisticsResult: Ultimate Automizer benchmark data CFG has 9 procedures, 48 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.7s, OverallIterations: 8, TraceHistogramMax: 3, AutomataDifference: 2.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 200 SDtfs, 117 SDslu, 904 SDs, 0 SdLazy, 368 SolverSat, 18 SolverUnsat, 1 SolverUnknown, 0 SolverNotchecked, 2.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 350 GetRequests, 279 SyntacticMatches, 6 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=47occurred in iteration=7, 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, 7 MinimizatonAttempts, 10 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.1s InterpolantComputationTime, 249 NumberOfCodeBlocks, 249 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 331 ConstructedInterpolants, 6 QuantifiedInterpolants, 27600 SizeOfPredicates, 24 NumberOfNonLiveVariables, 928 ConjunctsInSsa, 88 ConjunctsInUnsatCore, 11 InterpolantComputations, 3 PerfectInterpolantSequences, 55/80 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...