/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 NUM_VARIABLES --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/loops/lu.cmp.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:40:37,864 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:40:37,867 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:40:37,886 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:40:37,886 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:40:37,888 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:40:37,891 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:40:37,905 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:40:37,907 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:40:37,908 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:40:37,909 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:40:37,910 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:40:37,910 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:40:37,911 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:40:37,912 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:40:37,913 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:40:37,914 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:40:37,915 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:40:37,916 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:40:37,918 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:40:37,920 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:40:37,921 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:40:37,922 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:40:37,923 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:40:37,926 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 17:40:37,926 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 17:40:37,926 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 17:40:37,927 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 17:40:37,928 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 17:40:37,929 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 17:40:37,929 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 17:40:37,930 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 17:40:37,930 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 17:40:37,931 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 17:40:37,932 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 17:40:37,932 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 17:40:37,933 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 17:40:37,933 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 17:40:37,934 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:40:37,935 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:40:37,935 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:40:37,936 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 [2020-07-20 17:40:37,951 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:40:37,951 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:40:37,952 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:40:37,953 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:40:37,953 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:40:37,953 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:40:37,953 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:40:37,953 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:40:37,954 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:40:37,954 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:40:37,954 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:40:37,954 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:40:37,954 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:40:37,955 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:40:37,955 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:40:37,955 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:40:37,955 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:40:37,955 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:40:37,956 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:40:37,956 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:40:37,956 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:40:37,956 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:40:37,956 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:40:37,957 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:40:37,957 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:40:37,957 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:40:37,957 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:37,957 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:40:37,958 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:40:37,958 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 -> NUM_VARIABLES 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 [2020-07-20 17:40:38,254 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:40:38,269 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:40:38,273 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:40:38,274 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:40:38,275 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:40:38,276 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/lu.cmp.c [2020-07-20 17:40:38,356 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/824b2f9bd/b3088b08304346ba8eb591ca0aaa6e9a/FLAGee40a2d60 [2020-07-20 17:40:38,894 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:40:38,895 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/lu.cmp.c [2020-07-20 17:40:38,905 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/824b2f9bd/b3088b08304346ba8eb591ca0aaa6e9a/FLAGee40a2d60 [2020-07-20 17:40:39,227 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/824b2f9bd/b3088b08304346ba8eb591ca0aaa6e9a [2020-07-20 17:40:39,240 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:40:39,243 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:40:39,244 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:40:39,245 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:40:39,248 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:40:39,249 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:40:39" (1/1) ... [2020-07-20 17:40:39,253 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@438f8111 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:39, skipping insertion in model container [2020-07-20 17:40:39,253 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:40:39" (1/1) ... [2020-07-20 17:40:39,262 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:40:39,287 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:40:39,495 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:40:39,502 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:40:39,649 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:40:39,670 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:40:39,670 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:39 WrapperNode [2020-07-20 17:40:39,670 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:40:39,671 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:40:39,671 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:40:39,671 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:40:39,682 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:39" (1/1) ... [2020-07-20 17:40:39,683 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:39" (1/1) ... [2020-07-20 17:40:39,694 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:39" (1/1) ... [2020-07-20 17:40:39,694 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:39" (1/1) ... [2020-07-20 17:40:39,710 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:39" (1/1) ... [2020-07-20 17:40:39,719 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:39" (1/1) ... [2020-07-20 17:40:39,722 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:39" (1/1) ... [2020-07-20 17:40:39,726 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:40:39,727 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:40:39,727 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:40:39,727 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:40:39,728 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:39" (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 [2020-07-20 17:40:39,804 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:40:39,805 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:40:39,805 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 17:40:39,805 INFO L138 BoogieDeclarations]: Found implementation of procedure fabs [2020-07-20 17:40:39,805 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:40:39,805 INFO L138 BoogieDeclarations]: Found implementation of procedure ludcmp [2020-07-20 17:40:39,806 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:40:39,806 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:40:39,806 INFO L130 BoogieDeclarations]: Found specification of procedure ludcmp [2020-07-20 17:40:39,806 INFO L130 BoogieDeclarations]: Found specification of procedure fabs [2020-07-20 17:40:39,806 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:40:39,806 INFO L130 BoogieDeclarations]: Found specification of procedure write~real [2020-07-20 17:40:39,807 INFO L130 BoogieDeclarations]: Found specification of procedure read~real [2020-07-20 17:40:39,807 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 17:40:39,807 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 17:40:39,807 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:40:39,807 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:40:40,340 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:40:40,340 INFO L295 CfgBuilder]: Removed 11 assume(true) statements. [2020-07-20 17:40:40,345 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:40:40 BoogieIcfgContainer [2020-07-20 17:40:40,345 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:40:40,347 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:40:40,347 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:40:40,350 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:40:40,351 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:40:39" (1/3) ... [2020-07-20 17:40:40,352 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@427f636e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:40:40, skipping insertion in model container [2020-07-20 17:40:40,352 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:40:39" (2/3) ... [2020-07-20 17:40:40,352 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@427f636e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:40:40, skipping insertion in model container [2020-07-20 17:40:40,353 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:40:40" (3/3) ... [2020-07-20 17:40:40,355 INFO L109 eAbstractionObserver]: Analyzing ICFG lu.cmp.c [2020-07-20 17:40:40,366 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:40:40,375 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:40:40,390 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:40:40,414 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:40:40,415 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:40:40,415 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:40:40,415 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:40:40,415 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:40:40,416 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:40:40,416 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:40:40,416 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:40:40,437 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states. [2020-07-20 17:40:40,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-20 17:40:40,444 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:40,445 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:40,445 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:40,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:40,452 INFO L82 PathProgramCache]: Analyzing trace with hash 406725423, now seen corresponding path program 1 times [2020-07-20 17:40:40,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:40,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [462035078] [2020-07-20 17:40:40,462 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 [2020-07-20 17:40:40,575 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:40:40,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:40:40,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 17:40:40,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:40:40,606 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:40:40,606 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:40:40,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [462035078] [2020-07-20 17:40:40,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:40:40,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 17:40:40,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116244627] [2020-07-20 17:40:40,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 17:40:40,617 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:40:40,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 17:40:40,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 17:40:40,637 INFO L87 Difference]: Start difference. First operand 64 states. Second operand 2 states. [2020-07-20 17:40:40,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:40:40,675 INFO L93 Difference]: Finished difference Result 122 states and 178 transitions. [2020-07-20 17:40:40,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 17:40:40,677 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-07-20 17:40:40,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:40:40,690 INFO L225 Difference]: With dead ends: 122 [2020-07-20 17:40:40,690 INFO L226 Difference]: Without dead ends: 20 [2020-07-20 17:40:40,698 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 17:40:40,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-20 17:40:40,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-20 17:40:40,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-20 17:40:40,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-07-20 17:40:40,750 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 12 [2020-07-20 17:40:40,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:40:40,751 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-07-20 17:40:40,752 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 17:40:40,752 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-07-20 17:40:40,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-20 17:40:40,754 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:40,755 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:40,969 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:40,969 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:40,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:40,971 INFO L82 PathProgramCache]: Analyzing trace with hash 394719650, now seen corresponding path program 1 times [2020-07-20 17:40:40,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:40,972 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1724698172] [2020-07-20 17:40:40,973 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 [2020-07-20 17:40:41,041 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:40:41,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:40:41,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:40:41,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:40:41,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:40:41,085 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:40:41,085 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1724698172] [2020-07-20 17:40:41,085 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:40:41,085 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 17:40:41,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886044094] [2020-07-20 17:40:41,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 17:40:41,088 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:40:41,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 17:40:41,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 17:40:41,089 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 4 states. [2020-07-20 17:40:41,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:40:41,134 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2020-07-20 17:40:41,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 17:40:41,135 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-07-20 17:40:41,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:40:41,136 INFO L225 Difference]: With dead ends: 38 [2020-07-20 17:40:41,136 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 17:40:41,138 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 17:40:41,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 17:40:41,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2020-07-20 17:40:41,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 17:40:41,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-07-20 17:40:41,144 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 12 [2020-07-20 17:40:41,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:40:41,145 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-07-20 17:40:41,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 17:40:41,145 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-07-20 17:40:41,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 17:40:41,146 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:41,146 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:41,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:41,360 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:41,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:41,361 INFO L82 PathProgramCache]: Analyzing trace with hash -1180233829, now seen corresponding path program 1 times [2020-07-20 17:40:41,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:41,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1967587098] [2020-07-20 17:40:41,362 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 [2020-07-20 17:40:41,445 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:40:41,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:40:41,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 17:40:41,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:40:41,510 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:40:41,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:40:41,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:40:41,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1967587098] [2020-07-20 17:40:41,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:40:41,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-20 17:40:41,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173302059] [2020-07-20 17:40:41,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 17:40:41,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:40:41,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 17:40:41,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-07-20 17:40:41,600 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 8 states. [2020-07-20 17:40:41,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:40:41,696 INFO L93 Difference]: Finished difference Result 48 states and 58 transitions. [2020-07-20 17:40:41,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 17:40:41,696 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 16 [2020-07-20 17:40:41,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:40:41,698 INFO L225 Difference]: With dead ends: 48 [2020-07-20 17:40:41,698 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 17:40:41,699 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=50, Unknown=0, NotChecked=0, Total=90 [2020-07-20 17:40:41,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 17:40:41,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 17:40:41,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 17:40:41,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2020-07-20 17:40:41,705 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 16 [2020-07-20 17:40:41,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:40:41,706 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2020-07-20 17:40:41,706 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 17:40:41,706 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2020-07-20 17:40:41,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 17:40:41,707 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:41,707 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:41,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:41,922 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:41,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:41,923 INFO L82 PathProgramCache]: Analyzing trace with hash -1296658810, now seen corresponding path program 2 times [2020-07-20 17:40:41,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:41,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1589038521] [2020-07-20 17:40:41,925 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 [2020-07-20 17:40:41,985 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:40:41,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:40:41,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 17:40:41,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:40:42,010 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 17:40:42,010 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:40:42,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1589038521] [2020-07-20 17:40:42,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:40:42,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 17:40:42,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60167634] [2020-07-20 17:40:42,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 17:40:42,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:40:42,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 17:40:42,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 17:40:42,013 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand 4 states. [2020-07-20 17:40:42,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:40:42,078 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2020-07-20 17:40:42,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 17:40:42,079 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 28 [2020-07-20 17:40:42,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:40:42,082 INFO L225 Difference]: With dead ends: 87 [2020-07-20 17:40:42,082 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 17:40:42,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 17:40:42,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 17:40:42,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 36. [2020-07-20 17:40:42,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 17:40:42,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-07-20 17:40:42,096 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 28 [2020-07-20 17:40:42,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:40:42,097 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-07-20 17:40:42,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 17:40:42,097 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-07-20 17:40:42,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 17:40:42,098 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:42,098 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:42,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:42,312 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:42,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:42,313 INFO L82 PathProgramCache]: Analyzing trace with hash -479010360, now seen corresponding path program 1 times [2020-07-20 17:40:42,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:42,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1377377277] [2020-07-20 17:40:42,314 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 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 [2020-07-20 17:40:42,392 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:40:42,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:40:42,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 17:40:42,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:40:42,507 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:40:42,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:40:42,640 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:40:42,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1377377277] [2020-07-20 17:40:42,641 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:40:42,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-07-20 17:40:42,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804180023] [2020-07-20 17:40:42,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 17:40:42,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:40:42,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 17:40:42,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2020-07-20 17:40:42,645 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 14 states. [2020-07-20 17:40:43,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:40:43,063 INFO L93 Difference]: Finished difference Result 167 states and 208 transitions. [2020-07-20 17:40:43,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 17:40:43,064 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 28 [2020-07-20 17:40:43,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:40:43,069 INFO L225 Difference]: With dead ends: 167 [2020-07-20 17:40:43,069 INFO L226 Difference]: Without dead ends: 140 [2020-07-20 17:40:43,071 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=199, Invalid=401, Unknown=0, NotChecked=0, Total=600 [2020-07-20 17:40:43,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-07-20 17:40:43,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 82. [2020-07-20 17:40:43,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-20 17:40:43,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 99 transitions. [2020-07-20 17:40:43,108 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 99 transitions. Word has length 28 [2020-07-20 17:40:43,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:40:43,109 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 99 transitions. [2020-07-20 17:40:43,109 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 17:40:43,109 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 99 transitions. [2020-07-20 17:40:43,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-07-20 17:40:43,112 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:43,112 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:43,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:43,330 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:43,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:43,331 INFO L82 PathProgramCache]: Analyzing trace with hash -850791622, now seen corresponding path program 2 times [2020-07-20 17:40:43,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:43,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1545896039] [2020-07-20 17:40:43,331 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 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 [2020-07-20 17:40:43,446 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:40:43,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:40:43,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 17:40:43,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:40:43,476 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:40:43,506 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 17:40:43,507 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:40:43,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1545896039] [2020-07-20 17:40:43,508 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:40:43,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 17:40:43,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065404330] [2020-07-20 17:40:43,508 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 17:40:43,509 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:40:43,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 17:40:43,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 17:40:43,510 INFO L87 Difference]: Start difference. First operand 82 states and 99 transitions. Second operand 5 states. [2020-07-20 17:40:43,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:40:43,577 INFO L93 Difference]: Finished difference Result 88 states and 104 transitions. [2020-07-20 17:40:43,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 17:40:43,578 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 36 [2020-07-20 17:40:43,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:40:43,580 INFO L225 Difference]: With dead ends: 88 [2020-07-20 17:40:43,580 INFO L226 Difference]: Without dead ends: 86 [2020-07-20 17:40:43,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:40:43,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-20 17:40:43,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2020-07-20 17:40:43,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-20 17:40:43,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 102 transitions. [2020-07-20 17:40:43,592 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 102 transitions. Word has length 36 [2020-07-20 17:40:43,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:40:43,592 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 102 transitions. [2020-07-20 17:40:43,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 17:40:43,593 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 102 transitions. [2020-07-20 17:40:43,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-20 17:40:43,594 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:43,595 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:43,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:43,808 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:43,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:43,809 INFO L82 PathProgramCache]: Analyzing trace with hash 1389136727, now seen corresponding path program 1 times [2020-07-20 17:40:43,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:43,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1349415075] [2020-07-20 17:40:43,810 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 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 [2020-07-20 17:40:44,034 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:40:44,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:40:44,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 17:40:44,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:40:44,132 INFO L134 CoverageAnalysis]: Checked inductivity of 205 backedges. 110 proven. 28 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2020-07-20 17:40:44,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:40:44,230 INFO L134 CoverageAnalysis]: Checked inductivity of 205 backedges. 3 proven. 135 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2020-07-20 17:40:44,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1349415075] [2020-07-20 17:40:44,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:40:44,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-07-20 17:40:44,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481079971] [2020-07-20 17:40:44,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 17:40:44,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:40:44,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 17:40:44,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=107, Unknown=0, NotChecked=0, Total=182 [2020-07-20 17:40:44,235 INFO L87 Difference]: Start difference. First operand 86 states and 102 transitions. Second operand 14 states. [2020-07-20 17:40:44,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:40:44,353 INFO L93 Difference]: Finished difference Result 248 states and 299 transitions. [2020-07-20 17:40:44,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 17:40:44,354 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 61 [2020-07-20 17:40:44,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:40:44,356 INFO L225 Difference]: With dead ends: 248 [2020-07-20 17:40:44,356 INFO L226 Difference]: Without dead ends: 221 [2020-07-20 17:40:44,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=125, Unknown=0, NotChecked=0, Total=210 [2020-07-20 17:40:44,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2020-07-20 17:40:44,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 100. [2020-07-20 17:40:44,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-07-20 17:40:44,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 120 transitions. [2020-07-20 17:40:44,371 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 120 transitions. Word has length 61 [2020-07-20 17:40:44,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:40:44,372 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 120 transitions. [2020-07-20 17:40:44,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 17:40:44,372 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 120 transitions. [2020-07-20 17:40:44,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-20 17:40:44,374 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:44,374 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:44,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:44,588 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:44,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:44,589 INFO L82 PathProgramCache]: Analyzing trace with hash -752575031, now seen corresponding path program 2 times [2020-07-20 17:40:44,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:44,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1180930315] [2020-07-20 17:40:44,591 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 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 [2020-07-20 17:40:45,020 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:40:45,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:40:45,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 17:40:45,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:40:45,085 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 150 proven. 41 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2020-07-20 17:40:45,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:40:45,130 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 150 proven. 41 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2020-07-20 17:40:45,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1180930315] [2020-07-20 17:40:45,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:40:45,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-20 17:40:45,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960387471] [2020-07-20 17:40:45,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 17:40:45,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:40:45,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 17:40:45,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 17:40:45,137 INFO L87 Difference]: Start difference. First operand 100 states and 120 transitions. Second operand 8 states. [2020-07-20 17:40:45,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:40:45,241 INFO L93 Difference]: Finished difference Result 173 states and 207 transitions. [2020-07-20 17:40:45,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 17:40:45,244 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 69 [2020-07-20 17:40:45,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:40:45,245 INFO L225 Difference]: With dead ends: 173 [2020-07-20 17:40:45,245 INFO L226 Difference]: Without dead ends: 115 [2020-07-20 17:40:45,246 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-07-20 17:40:45,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-07-20 17:40:45,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 100. [2020-07-20 17:40:45,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-07-20 17:40:45,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 118 transitions. [2020-07-20 17:40:45,278 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 118 transitions. Word has length 69 [2020-07-20 17:40:45,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:40:45,278 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 118 transitions. [2020-07-20 17:40:45,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 17:40:45,279 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 118 transitions. [2020-07-20 17:40:45,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-20 17:40:45,280 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:45,280 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 10, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:45,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:45,496 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:45,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:45,497 INFO L82 PathProgramCache]: Analyzing trace with hash -618561525, now seen corresponding path program 3 times [2020-07-20 17:40:45,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:45,498 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [499714975] [2020-07-20 17:40:45,498 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 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:46,364 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:40:46,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:40:46,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 17:40:46,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:40:46,399 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:40:46,417 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 160 proven. 30 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2020-07-20 17:40:46,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:40:46,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:40:46,497 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 160 proven. 30 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2020-07-20 17:40:46,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [499714975] [2020-07-20 17:40:46,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:40:46,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 17:40:46,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851566427] [2020-07-20 17:40:46,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 17:40:46,506 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:40:46,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 17:40:46,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-07-20 17:40:46,507 INFO L87 Difference]: Start difference. First operand 100 states and 118 transitions. Second operand 10 states. [2020-07-20 17:40:46,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:40:46,838 INFO L93 Difference]: Finished difference Result 217 states and 261 transitions. [2020-07-20 17:40:46,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 17:40:46,838 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 69 [2020-07-20 17:40:46,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:40:46,841 INFO L225 Difference]: With dead ends: 217 [2020-07-20 17:40:46,841 INFO L226 Difference]: Without dead ends: 215 [2020-07-20 17:40:46,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 127 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=98, Invalid=244, Unknown=0, NotChecked=0, Total=342 [2020-07-20 17:40:46,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2020-07-20 17:40:46,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 157. [2020-07-20 17:40:46,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-20 17:40:46,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 189 transitions. [2020-07-20 17:40:46,857 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 189 transitions. Word has length 69 [2020-07-20 17:40:46,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:40:46,857 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 189 transitions. [2020-07-20 17:40:46,857 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 17:40:46,858 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 189 transitions. [2020-07-20 17:40:46,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-20 17:40:46,860 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:40:46,860 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 22, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:40:47,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:40:47,066 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:40:47,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:40:47,067 INFO L82 PathProgramCache]: Analyzing trace with hash -1572842069, now seen corresponding path program 4 times [2020-07-20 17:40:47,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:40:47,068 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1327356478] [2020-07-20 17:40:47,068 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:12,145 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:41:12,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:41:12,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 17:41:12,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:41:12,394 INFO L134 CoverageAnalysis]: Checked inductivity of 1242 backedges. 856 proven. 95 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2020-07-20 17:41:12,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:41:12,480 INFO L134 CoverageAnalysis]: Checked inductivity of 1242 backedges. 844 proven. 101 refuted. 0 times theorem prover too weak. 297 trivial. 0 not checked. [2020-07-20 17:41:12,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1327356478] [2020-07-20 17:41:12,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:41:12,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 17:41:12,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882212963] [2020-07-20 17:41:12,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 17:41:12,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:41:12,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 17:41:12,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:41:12,482 INFO L87 Difference]: Start difference. First operand 157 states and 189 transitions. Second operand 12 states. [2020-07-20 17:41:12,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:41:12,747 INFO L93 Difference]: Finished difference Result 392 states and 472 transitions. [2020-07-20 17:41:12,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 17:41:12,748 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 135 [2020-07-20 17:41:12,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:41:12,754 INFO L225 Difference]: With dead ends: 392 [2020-07-20 17:41:12,754 INFO L226 Difference]: Without dead ends: 248 [2020-07-20 17:41:12,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 259 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 17:41:12,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2020-07-20 17:41:12,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 194. [2020-07-20 17:41:12,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2020-07-20 17:41:12,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 232 transitions. [2020-07-20 17:41:12,776 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 232 transitions. Word has length 135 [2020-07-20 17:41:12,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:41:12,777 INFO L479 AbstractCegarLoop]: Abstraction has 194 states and 232 transitions. [2020-07-20 17:41:12,777 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 17:41:12,777 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 232 transitions. [2020-07-20 17:41:12,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-20 17:41:12,780 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:41:12,780 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 21, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:41:12,992 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:12,992 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:41:12,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:41:12,993 INFO L82 PathProgramCache]: Analyzing trace with hash -2016742743, now seen corresponding path program 5 times [2020-07-20 17:41:12,993 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:41:12,993 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [42084018] [2020-07-20 17:41:12,993 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:18,777 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:41:18,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:41:18,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 17:41:18,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:41:18,986 INFO L134 CoverageAnalysis]: Checked inductivity of 1242 backedges. 672 proven. 379 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-20 17:41:18,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:41:19,121 INFO L134 CoverageAnalysis]: Checked inductivity of 1242 backedges. 666 proven. 385 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-20 17:41:19,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [42084018] [2020-07-20 17:41:19,122 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:41:19,122 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2020-07-20 17:41:19,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74890798] [2020-07-20 17:41:19,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 17:41:19,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:41:19,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 17:41:19,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2020-07-20 17:41:19,125 INFO L87 Difference]: Start difference. First operand 194 states and 232 transitions. Second operand 15 states. [2020-07-20 17:41:19,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:41:19,686 INFO L93 Difference]: Finished difference Result 406 states and 484 transitions. [2020-07-20 17:41:19,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 17:41:19,687 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 135 [2020-07-20 17:41:19,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:41:19,689 INFO L225 Difference]: With dead ends: 406 [2020-07-20 17:41:19,690 INFO L226 Difference]: Without dead ends: 281 [2020-07-20 17:41:19,691 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 256 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=320, Unknown=0, NotChecked=0, Total=380 [2020-07-20 17:41:19,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2020-07-20 17:41:19,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 227. [2020-07-20 17:41:19,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2020-07-20 17:41:19,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 270 transitions. [2020-07-20 17:41:19,706 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 270 transitions. Word has length 135 [2020-07-20 17:41:19,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:41:19,707 INFO L479 AbstractCegarLoop]: Abstraction has 227 states and 270 transitions. [2020-07-20 17:41:19,707 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 17:41:19,707 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 270 transitions. [2020-07-20 17:41:19,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2020-07-20 17:41:19,710 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:41:19,710 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 26, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:41:19,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:19,918 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:41:19,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:41:19,919 INFO L82 PathProgramCache]: Analyzing trace with hash -1900915656, now seen corresponding path program 6 times [2020-07-20 17:41:19,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:41:19,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1771256018] [2020-07-20 17:41:19,920 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 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:38,038 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:41:38,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:41:38,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 17:41:38,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:41:38,435 INFO L134 CoverageAnalysis]: Checked inductivity of 1964 backedges. 783 proven. 922 refuted. 0 times theorem prover too weak. 259 trivial. 0 not checked. [2020-07-20 17:41:38,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:41:38,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:41:38,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:41:38,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:41:38,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:41:39,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1964 backedges. 656 proven. 1049 refuted. 0 times theorem prover too weak. 259 trivial. 0 not checked. [2020-07-20 17:41:39,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1771256018] [2020-07-20 17:41:39,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:41:39,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 29 [2020-07-20 17:41:39,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972146111] [2020-07-20 17:41:39,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 17:41:39,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:41:39,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 17:41:39,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=665, Unknown=0, NotChecked=0, Total=812 [2020-07-20 17:41:39,012 INFO L87 Difference]: Start difference. First operand 227 states and 270 transitions. Second operand 29 states. [2020-07-20 17:41:44,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:41:44,763 INFO L93 Difference]: Finished difference Result 741 states and 884 transitions. [2020-07-20 17:41:44,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2020-07-20 17:41:44,764 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 168 [2020-07-20 17:41:44,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:41:44,767 INFO L225 Difference]: With dead ends: 741 [2020-07-20 17:41:44,767 INFO L226 Difference]: Without dead ends: 296 [2020-07-20 17:41:44,770 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 307 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2480 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=1465, Invalid=7847, Unknown=0, NotChecked=0, Total=9312 [2020-07-20 17:41:44,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2020-07-20 17:41:44,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 262. [2020-07-20 17:41:44,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2020-07-20 17:41:44,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 289 transitions. [2020-07-20 17:41:44,785 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 289 transitions. Word has length 168 [2020-07-20 17:41:44,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:41:44,786 INFO L479 AbstractCegarLoop]: Abstraction has 262 states and 289 transitions. [2020-07-20 17:41:44,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 17:41:44,786 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 289 transitions. [2020-07-20 17:41:44,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2020-07-20 17:41:44,788 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:41:44,789 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 25, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:41:44,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:44,990 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:41:44,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:41:44,991 INFO L82 PathProgramCache]: Analyzing trace with hash 2135886202, now seen corresponding path program 7 times [2020-07-20 17:41:44,991 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:41:44,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1189313218] [2020-07-20 17:41:44,992 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:49:15,411 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:49:15,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:49:20,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 17:49:20,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:49:20,586 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:49:20,624 INFO L134 CoverageAnalysis]: Checked inductivity of 1964 backedges. 652 proven. 987 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-07-20 17:49:20,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:49:20,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:49:20,816 INFO L134 CoverageAnalysis]: Checked inductivity of 1964 backedges. 652 proven. 987 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-07-20 17:49:20,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1189313218] [2020-07-20 17:49:20,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:49:20,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2020-07-20 17:49:20,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735696251] [2020-07-20 17:49:20,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 17:49:20,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:49:20,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 17:49:20,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=177, Unknown=0, NotChecked=0, Total=240 [2020-07-20 17:49:20,819 INFO L87 Difference]: Start difference. First operand 262 states and 289 transitions. Second operand 16 states. [2020-07-20 17:49:21,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:49:21,957 INFO L93 Difference]: Finished difference Result 650 states and 762 transitions. [2020-07-20 17:49:21,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 17:49:21,958 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 168 [2020-07-20 17:49:21,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:49:21,963 INFO L225 Difference]: With dead ends: 650 [2020-07-20 17:49:21,964 INFO L226 Difference]: Without dead ends: 648 [2020-07-20 17:49:21,965 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 319 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=683, Invalid=1669, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 17:49:21,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 648 states. [2020-07-20 17:49:21,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 648 to 551. [2020-07-20 17:49:21,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 551 states. [2020-07-20 17:49:21,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 551 states to 551 states and 649 transitions. [2020-07-20 17:49:21,995 INFO L78 Accepts]: Start accepts. Automaton has 551 states and 649 transitions. Word has length 168 [2020-07-20 17:49:21,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:49:21,996 INFO L479 AbstractCegarLoop]: Abstraction has 551 states and 649 transitions. [2020-07-20 17:49:21,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 17:49:21,996 INFO L276 IsEmpty]: Start isEmpty. Operand 551 states and 649 transitions. [2020-07-20 17:49:22,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2020-07-20 17:49:22,002 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:49:22,003 INFO L422 BasicCegarLoop]: trace histogram [60, 60, 60, 55, 10, 10, 10, 10, 9, 9, 9, 9, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:49:22,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:49:22,204 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:49:22,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:49:22,205 INFO L82 PathProgramCache]: Analyzing trace with hash 93799369, now seen corresponding path program 8 times [2020-07-20 17:49:22,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:49:22,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1097511126] [2020-07-20 17:49:22,206 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 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in