/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/nla-digbench/mannadiv.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 18:21:16,875 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 18:21:16,877 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 18:21:16,895 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 18:21:16,895 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 18:21:16,897 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 18:21:16,899 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 18:21:16,911 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 18:21:16,913 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 18:21:16,915 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 18:21:16,917 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 18:21:16,918 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 18:21:16,918 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 18:21:16,921 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 18:21:16,922 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 18:21:16,923 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 18:21:16,924 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 18:21:16,925 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 18:21:16,926 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 18:21:16,928 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 18:21:16,929 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 18:21:16,930 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 18:21:16,931 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 18:21:16,932 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 18:21:16,934 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 18:21:16,941 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 18:21:16,942 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 18:21:16,943 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 18:21:16,944 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 18:21:16,958 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 18:21:16,958 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 18:21:16,959 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 18:21:16,959 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 18:21:16,960 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 18:21:16,960 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 18:21:16,960 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 18:21:16,960 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 18:21:16,960 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 18:21:16,961 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 18:21:16,961 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 18:21:16,961 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 18:21:16,961 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 18:21:16,961 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 18:21:16,962 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 18:21:16,962 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 18:21:16,962 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 18:21:16,962 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 18:21:16,962 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 18:21:16,963 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 18:21:16,963 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 18:21:16,963 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 18:21:16,963 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 18:21:16,963 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 18:21:16,964 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 18:21:16,964 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 18:21:16,964 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:21:16,964 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 18:21:16,964 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 18:21:16,965 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 18:21:17,235 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 18:21:17,247 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 18:21:17,250 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 18:21:17,252 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 18:21:17,252 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 18:21:17,253 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/mannadiv.c [2020-07-20 18:21:17,309 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fa2f7c647/4ad1c9fad00641639b6e84dba4c85fe2/FLAG82b62e4ec [2020-07-20 18:21:17,681 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 18:21:17,681 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/mannadiv.c [2020-07-20 18:21:17,687 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fa2f7c647/4ad1c9fad00641639b6e84dba4c85fe2/FLAG82b62e4ec [2020-07-20 18:21:18,052 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fa2f7c647/4ad1c9fad00641639b6e84dba4c85fe2 [2020-07-20 18:21:18,062 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 18:21:18,065 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 18:21:18,066 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 18:21:18,067 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 18:21:18,070 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 18:21:18,071 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:21:18" (1/1) ... [2020-07-20 18:21:18,074 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c9aaaca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:21:18, skipping insertion in model container [2020-07-20 18:21:18,074 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:21:18" (1/1) ... [2020-07-20 18:21:18,082 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 18:21:18,103 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 18:21:18,325 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 18:21:18,330 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 18:21:18,355 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 18:21:18,370 INFO L208 MainTranslator]: Completed translation [2020-07-20 18:21:18,370 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:21:18 WrapperNode [2020-07-20 18:21:18,370 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 18:21:18,371 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 18:21:18,371 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 18:21:18,371 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 18:21:18,385 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:21:18" (1/1) ... [2020-07-20 18:21:18,386 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:21:18" (1/1) ... [2020-07-20 18:21:18,393 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:21:18" (1/1) ... [2020-07-20 18:21:18,394 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:21:18" (1/1) ... [2020-07-20 18:21:18,402 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:21:18" (1/1) ... [2020-07-20 18:21:18,407 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:21:18" (1/1) ... [2020-07-20 18:21:18,408 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:21:18" (1/1) ... [2020-07-20 18:21:18,415 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 18:21:18,417 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 18:21:18,417 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 18:21:18,417 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 18:21:18,418 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:21:18" (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 18:21:18,559 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 18:21:18,560 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 18:21:18,560 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 18:21:18,560 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 18:21:18,561 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 18:21:18,561 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 18:21:18,562 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 18:21:18,562 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 18:21:18,562 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 18:21:18,562 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 18:21:18,564 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 18:21:18,564 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 18:21:18,564 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 18:21:18,761 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 18:21:18,761 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 18:21:18,765 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:21:18 BoogieIcfgContainer [2020-07-20 18:21:18,765 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 18:21:18,766 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 18:21:18,767 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 18:21:18,773 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 18:21:18,775 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 06:21:18" (1/3) ... [2020-07-20 18:21:18,776 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15164ccf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:21:18, skipping insertion in model container [2020-07-20 18:21:18,777 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:21:18" (2/3) ... [2020-07-20 18:21:18,777 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15164ccf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:21:18, skipping insertion in model container [2020-07-20 18:21:18,779 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:21:18" (3/3) ... [2020-07-20 18:21:18,783 INFO L109 eAbstractionObserver]: Analyzing ICFG mannadiv.c [2020-07-20 18:21:18,815 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 18:21:18,836 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 18:21:18,859 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 18:21:18,883 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 18:21:18,883 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 18:21:18,884 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 18:21:18,884 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 18:21:18,884 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 18:21:18,884 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 18:21:18,884 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 18:21:18,884 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 18:21:18,904 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-20 18:21:18,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 18:21:18,910 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:21:18,911 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:21:18,912 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:21:18,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:21:18,918 INFO L82 PathProgramCache]: Analyzing trace with hash -849943384, now seen corresponding path program 1 times [2020-07-20 18:21:18,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:21:18,927 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1246358560] [2020-07-20 18:21:18,928 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 18:21:19,008 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:21:19,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:21:19,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 18:21:19,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:21:19,039 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 18:21:19,040 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:21:19,041 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1246358560] [2020-07-20 18:21:19,042 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:21:19,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 18:21:19,043 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29544221] [2020-07-20 18:21:19,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 18:21:19,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:21:19,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 18:21:19,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 18:21:19,065 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 2 states. [2020-07-20 18:21:19,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:21:19,090 INFO L93 Difference]: Finished difference Result 50 states and 67 transitions. [2020-07-20 18:21:19,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 18:21:19,091 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 21 [2020-07-20 18:21:19,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:21:19,099 INFO L225 Difference]: With dead ends: 50 [2020-07-20 18:21:19,100 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 18:21:19,103 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 20 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 18:21:19,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 18:21:19,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-20 18:21:19,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-20 18:21:19,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2020-07-20 18:21:19,145 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 21 [2020-07-20 18:21:19,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:21:19,145 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2020-07-20 18:21:19,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 18:21:19,145 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2020-07-20 18:21:19,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 18:21:19,147 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:21:19,148 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:21:19,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:21:19,361 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:21:19,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:21:19,363 INFO L82 PathProgramCache]: Analyzing trace with hash -1193991140, now seen corresponding path program 1 times [2020-07-20 18:21:19,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:21:19,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [556084321] [2020-07-20 18:21:19,365 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 18:21:19,406 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:21:19,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:21:19,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 18:21:19,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:21:19,526 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 18:21:19,526 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 18:21:19,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [556084321] [2020-07-20 18:21:19,527 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 18:21:19,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 18:21:19,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511928958] [2020-07-20 18:21:19,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 18:21:19,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:21:19,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 18:21:19,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-20 18:21:19,531 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 8 states. [2020-07-20 18:21:19,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:21:19,660 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-07-20 18:21:19,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 18:21:19,660 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-07-20 18:21:19,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:21:19,663 INFO L225 Difference]: With dead ends: 34 [2020-07-20 18:21:19,663 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 18:21:19,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 18:21:19,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 18:21:19,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2020-07-20 18:21:19,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 18:21:19,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-07-20 18:21:19,674 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 21 [2020-07-20 18:21:19,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:21:19,676 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-07-20 18:21:19,676 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 18:21:19,676 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-07-20 18:21:19,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 18:21:19,677 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:21:19,678 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:21:19,890 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:21:19,891 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:21:19,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:21:19,891 INFO L82 PathProgramCache]: Analyzing trace with hash -1415100442, now seen corresponding path program 1 times [2020-07-20 18:21:19,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:21:19,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [198678280] [2020-07-20 18:21:19,893 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 18:21:19,926 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:21:19,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:21:19,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 18:21:19,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:21:20,028 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 18:21:20,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:21:20,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:21:20,137 INFO L320 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-07-20 18:21:20,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:21:20,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:21:20,207 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 18:21:20,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [198678280] [2020-07-20 18:21:20,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:21:20,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2020-07-20 18:21:20,209 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628027743] [2020-07-20 18:21:20,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 18:21:20,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:21:20,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 18:21:20,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 18:21:20,215 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 12 states. [2020-07-20 18:21:22,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:21:22,426 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-07-20 18:21:22,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 18:21:22,426 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 27 [2020-07-20 18:21:22,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:21:22,429 INFO L225 Difference]: With dead ends: 37 [2020-07-20 18:21:22,429 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 18:21:22,430 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2020-07-20 18:21:22,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 18:21:22,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2020-07-20 18:21:22,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 18:21:22,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-07-20 18:21:22,439 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 27 [2020-07-20 18:21:22,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:21:22,440 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-07-20 18:21:22,440 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 18:21:22,440 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-07-20 18:21:22,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 18:21:22,441 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:21:22,441 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:21:22,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:21:22,642 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:21:22,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:21:22,643 INFO L82 PathProgramCache]: Analyzing trace with hash -1831429119, now seen corresponding path program 1 times [2020-07-20 18:21:22,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:21:22,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1566444605] [2020-07-20 18:21:22,645 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 18:21:22,678 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:21:22,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:21:22,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 18:21:22,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:21:22,738 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 18:21:22,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:21:22,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:21:22,803 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 18:21:22,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1566444605] [2020-07-20 18:21:22,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:21:22,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-20 18:21:22,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507933760] [2020-07-20 18:21:22,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 18:21:22,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:21:22,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 18:21:22,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 18:21:22,806 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2020-07-20 18:21:27,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:21:27,125 INFO L93 Difference]: Finished difference Result 72 states and 84 transitions. [2020-07-20 18:21:27,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 18:21:27,127 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-20 18:21:27,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:21:27,128 INFO L225 Difference]: With dead ends: 72 [2020-07-20 18:21:27,129 INFO L226 Difference]: Without dead ends: 56 [2020-07-20 18:21:27,129 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-07-20 18:21:27,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-07-20 18:21:27,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-07-20 18:21:27,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 18:21:27,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 65 transitions. [2020-07-20 18:21:27,144 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 65 transitions. Word has length 29 [2020-07-20 18:21:27,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:21:27,145 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 65 transitions. [2020-07-20 18:21:27,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 18:21:27,145 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 65 transitions. [2020-07-20 18:21:27,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 18:21:27,147 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:21:27,147 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:21:27,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:21:27,361 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:21:27,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:21:27,362 INFO L82 PathProgramCache]: Analyzing trace with hash 802873865, now seen corresponding path program 1 times [2020-07-20 18:21:27,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:21:27,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [6371369] [2020-07-20 18:21:27,363 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 18:21:27,395 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:21:27,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:21:27,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 18:21:27,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:21:27,435 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 18:21:27,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:21:27,482 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 18:21:27,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [6371369] [2020-07-20 18:21:27,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:21:27,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-07-20 18:21:27,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409439934] [2020-07-20 18:21:27,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 18:21:27,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:21:27,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 18:21:27,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 18:21:27,485 INFO L87 Difference]: Start difference. First operand 56 states and 65 transitions. Second operand 6 states. [2020-07-20 18:21:27,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:21:27,552 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2020-07-20 18:21:27,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 18:21:27,556 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 45 [2020-07-20 18:21:27,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:21:27,557 INFO L225 Difference]: With dead ends: 86 [2020-07-20 18:21:27,557 INFO L226 Difference]: Without dead ends: 70 [2020-07-20 18:21:27,560 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-07-20 18:21:27,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-20 18:21:27,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-07-20 18:21:27,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 18:21:27,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2020-07-20 18:21:27,588 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 45 [2020-07-20 18:21:27,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:21:27,589 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2020-07-20 18:21:27,589 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 18:21:27,589 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2020-07-20 18:21:27,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 18:21:27,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:21:27,592 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:21:27,793 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:21:27,793 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:21:27,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:21:27,794 INFO L82 PathProgramCache]: Analyzing trace with hash -208243385, now seen corresponding path program 2 times [2020-07-20 18:21:27,795 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:21:27,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [589034625] [2020-07-20 18:21:27,796 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 18:21:27,850 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:21:27,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:21:27,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 18:21:27,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:21:27,979 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 18:21:27,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:21:28,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:21:28,285 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 18:21:28,286 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [589034625] [2020-07-20 18:21:28,286 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:21:28,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2020-07-20 18:21:28,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311981085] [2020-07-20 18:21:28,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 18:21:28,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:21:28,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 18:21:28,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-07-20 18:21:28,288 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand 12 states. [2020-07-20 18:21:28,501 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:21:39,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:21:39,351 INFO L93 Difference]: Finished difference Result 124 states and 150 transitions. [2020-07-20 18:21:39,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 18:21:39,353 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 45 [2020-07-20 18:21:39,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:21:39,356 INFO L225 Difference]: With dead ends: 124 [2020-07-20 18:21:39,356 INFO L226 Difference]: Without dead ends: 122 [2020-07-20 18:21:39,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2020-07-20 18:21:39,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-20 18:21:39,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 112. [2020-07-20 18:21:39,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-20 18:21:39,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 136 transitions. [2020-07-20 18:21:39,378 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 136 transitions. Word has length 45 [2020-07-20 18:21:39,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:21:39,379 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 136 transitions. [2020-07-20 18:21:39,379 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 18:21:39,379 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 136 transitions. [2020-07-20 18:21:39,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-20 18:21:39,381 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:21:39,381 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:21:39,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:21:39,584 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:21:39,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:21:39,585 INFO L82 PathProgramCache]: Analyzing trace with hash -53426768, now seen corresponding path program 2 times [2020-07-20 18:21:39,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:21:39,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [259884495] [2020-07-20 18:21:39,586 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 18:21:39,634 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:21:39,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:21:39,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-20 18:21:39,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:21:39,822 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-20 18:21:39,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:21:39,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:21:40,572 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-20 18:21:40,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [259884495] [2020-07-20 18:21:40,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:21:40,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-20 18:21:40,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178802255] [2020-07-20 18:21:40,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 18:21:40,574 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:21:40,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 18:21:40,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2020-07-20 18:21:40,575 INFO L87 Difference]: Start difference. First operand 112 states and 136 transitions. Second operand 14 states. [2020-07-20 18:21:40,901 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 18 [2020-07-20 18:21:41,128 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-20 18:21:43,683 WARN L193 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-20 18:21:43,957 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 19 [2020-07-20 18:21:44,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:21:44,029 INFO L93 Difference]: Finished difference Result 156 states and 183 transitions. [2020-07-20 18:21:44,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 18:21:44,033 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 53 [2020-07-20 18:21:44,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:21:44,035 INFO L225 Difference]: With dead ends: 156 [2020-07-20 18:21:44,040 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 18:21:44,042 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2020-07-20 18:21:44,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 18:21:44,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2020-07-20 18:21:44,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-20 18:21:44,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 115 transitions. [2020-07-20 18:21:44,083 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 115 transitions. Word has length 53 [2020-07-20 18:21:44,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:21:44,086 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 115 transitions. [2020-07-20 18:21:44,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 18:21:44,086 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 115 transitions. [2020-07-20 18:21:44,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-20 18:21:44,088 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:21:44,088 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:21:44,305 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:21:44,306 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:21:44,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:21:44,307 INFO L82 PathProgramCache]: Analyzing trace with hash 10333007, now seen corresponding path program 3 times [2020-07-20 18:21:44,307 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:21:44,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998546360] [2020-07-20 18:21:44,308 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 18:21:44,335 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:21:44,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:21:44,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 18:21:44,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:21:44,424 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-20 18:21:44,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:21:44,520 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-20 18:21:44,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [998546360] [2020-07-20 18:21:44,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:21:44,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 18:21:44,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407727264] [2020-07-20 18:21:44,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 18:21:44,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:21:44,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 18:21:44,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-07-20 18:21:44,527 INFO L87 Difference]: Start difference. First operand 98 states and 115 transitions. Second operand 10 states. [2020-07-20 18:21:44,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:21:44,725 INFO L93 Difference]: Finished difference Result 148 states and 180 transitions. [2020-07-20 18:21:44,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 18:21:44,731 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 61 [2020-07-20 18:21:44,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:21:44,733 INFO L225 Difference]: With dead ends: 148 [2020-07-20 18:21:44,733 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 18:21:44,734 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2020-07-20 18:21:44,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 18:21:44,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2020-07-20 18:21:44,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-20 18:21:44,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 138 transitions. [2020-07-20 18:21:44,755 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 138 transitions. Word has length 61 [2020-07-20 18:21:44,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:21:44,755 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 138 transitions. [2020-07-20 18:21:44,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 18:21:44,756 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 138 transitions. [2020-07-20 18:21:44,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-20 18:21:44,757 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:21:44,758 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:21:44,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:21:44,971 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:21:44,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:21:44,972 INFO L82 PathProgramCache]: Analyzing trace with hash -185889457, now seen corresponding path program 4 times [2020-07-20 18:21:44,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:21:44,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1045727848] [2020-07-20 18:21:44,973 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 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 18:21:45,001 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:21:45,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:21:45,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 18:21:45,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:21:45,067 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-20 18:21:45,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:21:45,139 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 32 proven. 28 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2020-07-20 18:21:45,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1045727848] [2020-07-20 18:21:45,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:21:45,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-20 18:21:45,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100765725] [2020-07-20 18:21:45,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 18:21:45,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:21:45,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 18:21:45,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-20 18:21:45,141 INFO L87 Difference]: Start difference. First operand 116 states and 138 transitions. Second operand 9 states. [2020-07-20 18:21:45,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:21:45,348 INFO L93 Difference]: Finished difference Result 134 states and 156 transitions. [2020-07-20 18:21:45,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 18:21:45,355 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 61 [2020-07-20 18:21:45,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:21:45,357 INFO L225 Difference]: With dead ends: 134 [2020-07-20 18:21:45,357 INFO L226 Difference]: Without dead ends: 116 [2020-07-20 18:21:45,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 111 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-07-20 18:21:45,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-20 18:21:45,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2020-07-20 18:21:45,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-20 18:21:45,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 135 transitions. [2020-07-20 18:21:45,376 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 135 transitions. Word has length 61 [2020-07-20 18:21:45,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:21:45,376 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 135 transitions. [2020-07-20 18:21:45,376 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 18:21:45,376 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 135 transitions. [2020-07-20 18:21:45,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-20 18:21:45,378 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:21:45,378 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:21:45,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:21:45,594 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:21:45,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:21:45,595 INFO L82 PathProgramCache]: Analyzing trace with hash -377856460, now seen corresponding path program 5 times [2020-07-20 18:21:45,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:21:45,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [37938535] [2020-07-20 18:21:45,596 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 18:21:45,641 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:21:45,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:21:45,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-20 18:21:45,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:21:46,085 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 12 proven. 72 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-20 18:21:46,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:21:46,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:21:47,282 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 12 proven. 72 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-20 18:21:47,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [37938535] [2020-07-20 18:21:47,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:21:47,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2020-07-20 18:21:47,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673878037] [2020-07-20 18:21:47,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 18:21:47,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:21:47,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 18:21:47,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-07-20 18:21:47,285 INFO L87 Difference]: Start difference. First operand 116 states and 135 transitions. Second operand 18 states. [2020-07-20 18:21:48,419 WARN L193 SmtUtils]: Spent 342.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-20 18:21:49,081 WARN L193 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-20 18:21:49,403 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-20 18:21:51,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:21:51,889 INFO L93 Difference]: Finished difference Result 140 states and 156 transitions. [2020-07-20 18:21:51,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 18:21:51,890 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 69 [2020-07-20 18:21:51,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:21:51,892 INFO L225 Difference]: With dead ends: 140 [2020-07-20 18:21:51,892 INFO L226 Difference]: Without dead ends: 86 [2020-07-20 18:21:51,894 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 119 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2020-07-20 18:21:51,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-20 18:21:51,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2020-07-20 18:21:51,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-20 18:21:51,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 100 transitions. [2020-07-20 18:21:51,905 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 100 transitions. Word has length 69 [2020-07-20 18:21:51,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:21:51,905 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 100 transitions. [2020-07-20 18:21:51,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 18:21:51,906 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 100 transitions. [2020-07-20 18:21:51,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-07-20 18:21:51,907 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:21:51,907 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:21:52,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:21:52,122 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:21:52,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:21:52,123 INFO L82 PathProgramCache]: Analyzing trace with hash 728435349, now seen corresponding path program 6 times [2020-07-20 18:21:52,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:21:52,123 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2038201686] [2020-07-20 18:21:52,124 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 18:21:52,155 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:21:52,156 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:21:52,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 18:21:52,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:21:52,247 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-20 18:21:52,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:21:52,356 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-20 18:21:52,357 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2038201686] [2020-07-20 18:21:52,357 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:21:52,357 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 13 [2020-07-20 18:21:52,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713960315] [2020-07-20 18:21:52,358 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 18:21:52,358 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:21:52,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 18:21:52,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2020-07-20 18:21:52,359 INFO L87 Difference]: Start difference. First operand 86 states and 100 transitions. Second operand 13 states. [2020-07-20 18:21:52,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:21:52,707 INFO L93 Difference]: Finished difference Result 148 states and 180 transitions. [2020-07-20 18:21:52,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 18:21:52,710 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 77 [2020-07-20 18:21:52,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:21:52,712 INFO L225 Difference]: With dead ends: 148 [2020-07-20 18:21:52,712 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 18:21:52,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 139 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-20 18:21:52,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 18:21:52,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 116. [2020-07-20 18:21:52,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-20 18:21:52,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 139 transitions. [2020-07-20 18:21:52,728 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 139 transitions. Word has length 77 [2020-07-20 18:21:52,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:21:52,729 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 139 transitions. [2020-07-20 18:21:52,729 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 18:21:52,729 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 139 transitions. [2020-07-20 18:21:52,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-07-20 18:21:52,730 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:21:52,730 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:21:52,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:21:52,946 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:21:52,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:21:52,947 INFO L82 PathProgramCache]: Analyzing trace with hash -323556203, now seen corresponding path program 7 times [2020-07-20 18:21:52,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:21:52,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437216041] [2020-07-20 18:21:52,948 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 18:21:52,978 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:21:52,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:21:52,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 18:21:52,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:21:53,054 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-20 18:21:53,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:21:53,153 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 52 proven. 60 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-20 18:21:53,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [437216041] [2020-07-20 18:21:53,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:21:53,154 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 18:21:53,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683260156] [2020-07-20 18:21:53,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 18:21:53,155 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:21:53,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 18:21:53,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2020-07-20 18:21:53,156 INFO L87 Difference]: Start difference. First operand 116 states and 139 transitions. Second operand 12 states. [2020-07-20 18:21:53,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:21:53,612 INFO L93 Difference]: Finished difference Result 138 states and 162 transitions. [2020-07-20 18:21:53,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 18:21:53,615 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 77 [2020-07-20 18:21:53,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:21:53,616 INFO L225 Difference]: With dead ends: 138 [2020-07-20 18:21:53,617 INFO L226 Difference]: Without dead ends: 116 [2020-07-20 18:21:53,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 139 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2020-07-20 18:21:53,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-20 18:21:53,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2020-07-20 18:21:53,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-20 18:21:53,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 137 transitions. [2020-07-20 18:21:53,639 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 137 transitions. Word has length 77 [2020-07-20 18:21:53,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:21:53,640 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 137 transitions. [2020-07-20 18:21:53,640 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 18:21:53,640 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 137 transitions. [2020-07-20 18:21:53,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-20 18:21:53,641 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:21:53,641 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 8, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:21:53,842 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:21:53,842 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:21:53,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:21:53,843 INFO L82 PathProgramCache]: Analyzing trace with hash -1534824776, now seen corresponding path program 8 times [2020-07-20 18:21:53,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:21:53,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [877672942] [2020-07-20 18:21:53,844 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 18:21:53,888 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:21:53,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:21:53,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-20 18:21:53,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:21:54,643 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 16 proven. 128 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-20 18:21:54,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:21:54,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:21:57,182 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 16 proven. 128 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-20 18:21:57,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [877672942] [2020-07-20 18:21:57,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:21:57,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-20 18:21:57,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496458942] [2020-07-20 18:21:57,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 18:21:57,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:21:57,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 18:21:57,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=406, Unknown=0, NotChecked=0, Total=462 [2020-07-20 18:21:57,185 INFO L87 Difference]: Start difference. First operand 116 states and 137 transitions. Second operand 22 states. [2020-07-20 18:22:09,107 WARN L193 SmtUtils]: Spent 364.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 20 [2020-07-20 18:22:12,501 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-20 18:22:15,187 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-20 18:22:16,245 WARN L193 SmtUtils]: Spent 720.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 21 [2020-07-20 18:22:33,650 WARN L193 SmtUtils]: Spent 3.02 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 18:22:37,788 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 18:22:49,343 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 18:22:54,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:22:54,795 INFO L93 Difference]: Finished difference Result 236 states and 280 transitions. [2020-07-20 18:22:54,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 18:22:54,799 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 85 [2020-07-20 18:22:54,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:22:54,803 INFO L225 Difference]: With dead ends: 236 [2020-07-20 18:22:54,803 INFO L226 Difference]: Without dead ends: 202 [2020-07-20 18:22:54,805 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 147 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 35.0s TimeCoverageRelationStatistics Valid=128, Invalid=1058, Unknown=4, NotChecked=0, Total=1190 [2020-07-20 18:22:54,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-20 18:22:54,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 200. [2020-07-20 18:22:54,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-20 18:22:54,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 237 transitions. [2020-07-20 18:22:54,844 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 237 transitions. Word has length 85 [2020-07-20 18:22:54,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:22:54,845 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 237 transitions. [2020-07-20 18:22:54,845 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 18:22:54,845 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 237 transitions. [2020-07-20 18:22:54,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-20 18:22:54,847 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:22:54,847 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 6, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:22:55,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:22:55,065 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:22:55,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:22:55,065 INFO L82 PathProgramCache]: Analyzing trace with hash -2106989411, now seen corresponding path program 9 times [2020-07-20 18:22:55,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:22:55,066 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [721649750] [2020-07-20 18:22:55,067 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 [2020-07-20 18:22:55,145 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:22:55,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:22:55,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-20 18:22:55,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:22:55,607 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:22:55,881 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:22:56,308 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:22:56,805 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:22:57,312 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:22:57,750 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-20 18:22:58,364 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 18 proven. 162 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-20 18:22:58,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:22:58,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:23:07,610 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 18 proven. 162 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-20 18:23:07,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [721649750] [2020-07-20 18:23:07,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:23:07,611 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 24 [2020-07-20 18:23:07,611 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392371801] [2020-07-20 18:23:07,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 18:23:07,612 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:23:07,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 18:23:07,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-07-20 18:23:07,613 INFO L87 Difference]: Start difference. First operand 200 states and 237 transitions. Second operand 24 states. [2020-07-20 18:23:10,702 WARN L193 SmtUtils]: Spent 1.63 s on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-20 18:23:11,997 WARN L193 SmtUtils]: Spent 709.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-20 18:23:12,930 WARN L193 SmtUtils]: Spent 377.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-20 18:23:16,645 WARN L193 SmtUtils]: Spent 447.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 18:23:18,686 WARN L193 SmtUtils]: Spent 1.18 s on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:23:20,146 WARN L193 SmtUtils]: Spent 506.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-20 18:23:23,545 WARN L193 SmtUtils]: Spent 2.51 s on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-20 18:23:26,099 WARN L193 SmtUtils]: Spent 1.47 s on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-20 18:23:27,822 WARN L193 SmtUtils]: Spent 691.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-07-20 18:23:27,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:23:27,983 INFO L93 Difference]: Finished difference Result 224 states and 258 transitions. [2020-07-20 18:23:27,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 18:23:27,994 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 93 [2020-07-20 18:23:27,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:23:27,995 INFO L225 Difference]: With dead ends: 224 [2020-07-20 18:23:27,996 INFO L226 Difference]: Without dead ends: 166 [2020-07-20 18:23:27,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 27.1s TimeCoverageRelationStatistics Valid=138, Invalid=984, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 18:23:27,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-07-20 18:23:28,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2020-07-20 18:23:28,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2020-07-20 18:23:28,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 193 transitions. [2020-07-20 18:23:28,012 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 193 transitions. Word has length 93 [2020-07-20 18:23:28,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:23:28,012 INFO L479 AbstractCegarLoop]: Abstraction has 166 states and 193 transitions. [2020-07-20 18:23:28,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 18:23:28,012 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 193 transitions. [2020-07-20 18:23:28,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-20 18:23:28,014 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:23:28,014 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 7, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:23:28,219 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:23:28,220 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:23:28,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:23:28,220 INFO L82 PathProgramCache]: Analyzing trace with hash -178978853, now seen corresponding path program 10 times [2020-07-20 18:23:28,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:23:28,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1401272293] [2020-07-20 18:23:28,222 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 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:23:28,254 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:23:28,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:23:28,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 18:23:28,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:23:28,352 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 76 proven. 104 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-20 18:23:28,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:23:28,502 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 76 proven. 104 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-20 18:23:28,505 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1401272293] [2020-07-20 18:23:28,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:23:28,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2020-07-20 18:23:28,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740454661] [2020-07-20 18:23:28,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 18:23:28,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:23:28,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 18:23:28,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-07-20 18:23:28,511 INFO L87 Difference]: Start difference. First operand 166 states and 193 transitions. Second operand 15 states. [2020-07-20 18:23:28,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:23:28,990 INFO L93 Difference]: Finished difference Result 220 states and 261 transitions. [2020-07-20 18:23:28,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 18:23:28,998 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 93 [2020-07-20 18:23:28,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:23:29,000 INFO L225 Difference]: With dead ends: 220 [2020-07-20 18:23:29,000 INFO L226 Difference]: Without dead ends: 194 [2020-07-20 18:23:29,001 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 167 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=121, Invalid=341, Unknown=0, NotChecked=0, Total=462 [2020-07-20 18:23:29,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2020-07-20 18:23:29,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 194. [2020-07-20 18:23:29,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2020-07-20 18:23:29,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 230 transitions. [2020-07-20 18:23:29,019 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 230 transitions. Word has length 93 [2020-07-20 18:23:29,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:23:29,020 INFO L479 AbstractCegarLoop]: Abstraction has 194 states and 230 transitions. [2020-07-20 18:23:29,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 18:23:29,020 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 230 transitions. [2020-07-20 18:23:29,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-07-20 18:23:29,021 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:23:29,021 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 8, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:23:29,234 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:23:29,235 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:23:29,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:23:29,235 INFO L82 PathProgramCache]: Analyzing trace with hash -837428226, now seen corresponding path program 11 times [2020-07-20 18:23:29,235 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:23:29,235 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1289125802] [2020-07-20 18:23:29,235 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 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:23:29,301 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:23:29,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:23:29,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 45 conjunts are in the unsatisfiable core [2020-07-20 18:23:29,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:23:30,117 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:23:30,462 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:23:31,231 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:23:31,868 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 18:23:32,479 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 20 proven. 200 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-20 18:23:32,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:23:33,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:23:45,257 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 20 proven. 200 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-20 18:23:45,258 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1289125802] [2020-07-20 18:23:45,258 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:23:45,258 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2020-07-20 18:23:45,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592257413] [2020-07-20 18:23:45,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 18:23:45,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:23:45,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 18:23:45,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=583, Unknown=0, NotChecked=0, Total=650 [2020-07-20 18:23:45,259 INFO L87 Difference]: Start difference. First operand 194 states and 230 transitions. Second operand 26 states. [2020-07-20 18:24:07,668 WARN L193 SmtUtils]: Spent 402.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-20 18:24:09,052 WARN L193 SmtUtils]: Spent 318.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-20 18:24:10,159 WARN L193 SmtUtils]: Spent 350.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-20 18:24:23,153 WARN L193 SmtUtils]: Spent 390.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-20 18:24:28,640 WARN L193 SmtUtils]: Spent 432.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-20 18:25:02,629 WARN L193 SmtUtils]: Spent 4.42 s on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 18:25:16,263 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* c_main_~y1~0 c_main_~x2~0))) (and (= (+ c_main_~x1~0 3) (+ c_main_~x2~0 c_main_~y3~0 .cse0)) (= (+ (* 2 c_main_~y2~0) (* 3 c_main_~y1~0) c_main_~y3~0 (* c_main_~y2~0 c_main_~y1~0)) (+ c_main_~x1~0 2)) (= (+ c_main_~y2~0 c_main_~y3~0 .cse0) c_main_~x1~0))) is different from false [2020-07-20 18:25:24,017 WARN L193 SmtUtils]: Spent 309.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 18:25:33,226 WARN L193 SmtUtils]: Spent 877.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 18:25:45,757 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 18:26:13,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:26:13,193 INFO L93 Difference]: Finished difference Result 340 states and 402 transitions. [2020-07-20 18:26:13,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 18:26:13,201 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 101 [2020-07-20 18:26:13,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:26:13,203 INFO L225 Difference]: With dead ends: 340 [2020-07-20 18:26:13,203 INFO L226 Difference]: Without dead ends: 302 [2020-07-20 18:26:13,205 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 175 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 95.4s TimeCoverageRelationStatistics Valid=151, Invalid=1484, Unknown=9, NotChecked=78, Total=1722 [2020-07-20 18:26:13,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2020-07-20 18:26:13,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 302. [2020-07-20 18:26:13,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-07-20 18:26:13,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 356 transitions. [2020-07-20 18:26:13,234 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 356 transitions. Word has length 101 [2020-07-20 18:26:13,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:26:13,235 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 356 transitions. [2020-07-20 18:26:13,235 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 18:26:13,235 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 356 transitions. [2020-07-20 18:26:13,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 18:26:13,237 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:26:13,237 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 9, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:26:13,437 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:26:13,438 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:26:13,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:26:13,438 INFO L82 PathProgramCache]: Analyzing trace with hash -1126316255, now seen corresponding path program 12 times [2020-07-20 18:26:13,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:26:13,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598278119] [2020-07-20 18:26:13,439 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:26:13,473 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:26:13,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:26:13,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 18:26:13,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:26:13,619 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 104 proven. 160 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2020-07-20 18:26:13,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:26:13,853 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 104 proven. 160 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2020-07-20 18:26:13,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598278119] [2020-07-20 18:26:13,854 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:26:13,854 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 18 [2020-07-20 18:26:13,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128628048] [2020-07-20 18:26:13,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 18:26:13,855 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:26:13,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 18:26:13,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2020-07-20 18:26:13,856 INFO L87 Difference]: Start difference. First operand 302 states and 356 transitions. Second operand 18 states. [2020-07-20 18:26:15,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:26:15,580 INFO L93 Difference]: Finished difference Result 368 states and 440 transitions. [2020-07-20 18:26:15,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 18:26:15,586 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 109 [2020-07-20 18:26:15,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:26:15,589 INFO L225 Difference]: With dead ends: 368 [2020-07-20 18:26:15,589 INFO L226 Difference]: Without dead ends: 338 [2020-07-20 18:26:15,590 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 195 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=207, Invalid=663, Unknown=0, NotChecked=0, Total=870 [2020-07-20 18:26:15,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2020-07-20 18:26:15,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 338. [2020-07-20 18:26:15,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 338 states. [2020-07-20 18:26:15,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 404 transitions. [2020-07-20 18:26:15,625 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 404 transitions. Word has length 109 [2020-07-20 18:26:15,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:26:15,625 INFO L479 AbstractCegarLoop]: Abstraction has 338 states and 404 transitions. [2020-07-20 18:26:15,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 18:26:15,626 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 404 transitions. [2020-07-20 18:26:15,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 18:26:15,628 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:26:15,628 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 12, 10, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:26:15,829 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:26:15,829 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:26:15,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:26:15,830 INFO L82 PathProgramCache]: Analyzing trace with hash 1251867972, now seen corresponding path program 13 times [2020-07-20 18:26:15,830 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:26:15,831 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1175029047] [2020-07-20 18:26:15,831 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 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:26:15,916 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:26:15,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:26:15,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-20 18:26:15,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:26:17,545 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:26:18,158 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:26:18,818 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:26:19,502 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:26:20,240 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:26:21,361 WARN L193 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 18:26:22,472 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 24 proven. 288 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-20 18:26:22,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:26:23,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:26:50,464 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 24 proven. 288 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-20 18:26:50,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1175029047] [2020-07-20 18:26:50,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:26:50,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 30 [2020-07-20 18:26:50,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572854398] [2020-07-20 18:26:50,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 18:26:50,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:26:50,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 18:26:50,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=792, Unknown=0, NotChecked=0, Total=870 [2020-07-20 18:26:50,467 INFO L87 Difference]: Start difference. First operand 338 states and 404 transitions. Second operand 30 states. [2020-07-20 18:26:56,528 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* c_main_~y1~0 c_main_~x2~0))) (and (= (+ c_main_~x1~0 1) (+ (* 2 c_main_~y2~0) (* 5 c_main_~y1~0) c_main_~y3~0 (* c_main_~y2~0 c_main_~y1~0))) (= (+ c_main_~x1~0 4) (+ c_main_~x2~0 c_main_~y3~0 .cse0)) (= (+ c_main_~y2~0 c_main_~y3~0 .cse0) c_main_~x1~0))) is different from false [2020-07-20 18:27:04,966 WARN L193 SmtUtils]: Spent 799.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 18:27:28,300 WARN L193 SmtUtils]: Spent 2.47 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 18:27:56,782 WARN L193 SmtUtils]: Spent 1.43 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 18:29:13,180 WARN L193 SmtUtils]: Spent 1.72 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 18:29:14,919 WARN L193 SmtUtils]: Spent 369.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-20 18:29:18,119 WARN L193 SmtUtils]: Spent 676.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-07-20 18:29:20,856 WARN L193 SmtUtils]: Spent 737.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-20 18:29:38,975 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 18:29:53,667 WARN L193 SmtUtils]: Spent 560.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-20 18:30:06,026 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 18:30:10,220 WARN L193 SmtUtils]: Spent 830.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 21 [2020-07-20 18:30:23,673 WARN L193 SmtUtils]: Spent 855.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-20 18:30:27,069 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (* c_main_~y1~0 c_main_~x2~0))) (and (= (+ c_main_~x1~0 1) (+ (* 2 c_main_~y2~0) (* 5 c_main_~y1~0) c_main_~y3~0 (* c_main_~y2~0 c_main_~y1~0))) (= (+ c_main_~x1~0 5) (+ c_main_~x2~0 c_main_~y3~0 .cse0)) (= (+ c_main_~y2~0 c_main_~y3~0 .cse0) c_main_~x1~0))) is different from false [2020-07-20 18:30:40,443 WARN L193 SmtUtils]: Spent 2.09 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 18:30:55,301 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 18:31:23,322 WARN L193 SmtUtils]: Spent 2.18 s on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 18:31:43,998 WARN L193 SmtUtils]: Spent 829.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 18:32:00,976 WARN L193 SmtUtils]: Spent 751.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 18:32:18,335 WARN L193 SmtUtils]: Spent 917.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 18:32:23,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:32:23,964 INFO L93 Difference]: Finished difference Result 512 states and 613 transitions. [2020-07-20 18:32:23,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 18:32:23,978 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 117 [2020-07-20 18:32:23,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:32:23,982 INFO L225 Difference]: With dead ends: 512 [2020-07-20 18:32:23,982 INFO L226 Difference]: Without dead ends: 470 [2020-07-20 18:32:23,983 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 203 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 184.6s TimeCoverageRelationStatistics Valid=194, Invalid=2455, Unknown=11, NotChecked=202, Total=2862 [2020-07-20 18:32:23,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2020-07-20 18:32:24,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 470. [2020-07-20 18:32:24,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 470 states. [2020-07-20 18:32:24,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 562 transitions. [2020-07-20 18:32:24,038 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 562 transitions. Word has length 117 [2020-07-20 18:32:24,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:32:24,040 INFO L479 AbstractCegarLoop]: Abstraction has 470 states and 562 transitions. [2020-07-20 18:32:24,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-20 18:32:24,040 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 562 transitions. [2020-07-20 18:32:24,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-20 18:32:24,041 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:32:24,042 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 10, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:32:24,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:32:24,257 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:32:24,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:32:24,258 INFO L82 PathProgramCache]: Analyzing trace with hash 1353613609, now seen corresponding path program 14 times [2020-07-20 18:32:24,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:32:24,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [294841529] [2020-07-20 18:32:24,258 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 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:32:24,326 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:32:24,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:32:24,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 18:32:24,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:32:24,531 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 172 proven. 168 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-07-20 18:32:24,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:32:24,777 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 92 proven. 248 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-07-20 18:32:24,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [294841529] [2020-07-20 18:32:24,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:32:24,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-20 18:32:24,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086899680] [2020-07-20 18:32:24,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 18:32:24,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:32:24,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 18:32:24,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=195, Unknown=0, NotChecked=0, Total=272 [2020-07-20 18:32:24,781 INFO L87 Difference]: Start difference. First operand 470 states and 562 transitions. Second operand 17 states. [2020-07-20 18:32:26,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:32:26,398 INFO L93 Difference]: Finished difference Result 532 states and 639 transitions. [2020-07-20 18:32:26,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 18:32:26,412 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 125 [2020-07-20 18:32:26,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:32:26,416 INFO L225 Difference]: With dead ends: 532 [2020-07-20 18:32:26,416 INFO L226 Difference]: Without dead ends: 454 [2020-07-20 18:32:26,418 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 229 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=119, Invalid=301, Unknown=0, NotChecked=0, Total=420 [2020-07-20 18:32:26,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2020-07-20 18:32:26,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 452. [2020-07-20 18:32:26,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 452 states. [2020-07-20 18:32:26,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 533 transitions. [2020-07-20 18:32:26,469 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 533 transitions. Word has length 125 [2020-07-20 18:32:26,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:32:26,470 INFO L479 AbstractCegarLoop]: Abstraction has 452 states and 533 transitions. [2020-07-20 18:32:26,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 18:32:26,470 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 533 transitions. [2020-07-20 18:32:26,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-20 18:32:26,471 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:32:26,472 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 11, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:32:26,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:32:26,686 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:32:26,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:32:26,686 INFO L82 PathProgramCache]: Analyzing trace with hash -1050066329, now seen corresponding path program 15 times [2020-07-20 18:32:26,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:32:26,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [184795991] [2020-07-20 18:32:26,687 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:32:26,726 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 18:32:26,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:32:26,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 18:32:26,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:32:26,934 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 136 proven. 228 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2020-07-20 18:32:26,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:32:27,252 INFO L134 CoverageAnalysis]: Checked inductivity of 680 backedges. 136 proven. 228 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2020-07-20 18:32:27,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [184795991] [2020-07-20 18:32:27,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:32:27,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 21 [2020-07-20 18:32:27,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988609453] [2020-07-20 18:32:27,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 18:32:27,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:32:27,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 18:32:27,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2020-07-20 18:32:27,255 INFO L87 Difference]: Start difference. First operand 452 states and 533 transitions. Second operand 21 states. [2020-07-20 18:32:33,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:32:33,987 INFO L93 Difference]: Finished difference Result 526 states and 627 transitions. [2020-07-20 18:32:33,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 18:32:33,997 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 125 [2020-07-20 18:32:33,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:32:34,001 INFO L225 Difference]: With dead ends: 526 [2020-07-20 18:32:34,001 INFO L226 Difference]: Without dead ends: 492 [2020-07-20 18:32:34,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 223 SyntacticMatches, 7 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=329, Invalid=1153, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 18:32:34,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2020-07-20 18:32:34,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 492. [2020-07-20 18:32:34,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 492 states. [2020-07-20 18:32:34,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 586 transitions. [2020-07-20 18:32:34,042 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 586 transitions. Word has length 125 [2020-07-20 18:32:34,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:32:34,043 INFO L479 AbstractCegarLoop]: Abstraction has 492 states and 586 transitions. [2020-07-20 18:32:34,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 18:32:34,043 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 586 transitions. [2020-07-20 18:32:34,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-20 18:32:34,044 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:32:34,045 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 14, 14, 14, 14, 12, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:32:34,259 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:32:34,260 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:32:34,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:32:34,261 INFO L82 PathProgramCache]: Analyzing trace with hash 3461770, now seen corresponding path program 16 times [2020-07-20 18:32:34,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:32:34,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1377063016] [2020-07-20 18:32:34,261 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 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:32:34,351 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:32:34,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:32:34,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 57 conjunts are in the unsatisfiable core [2020-07-20 18:32:34,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:32:34,597 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 18:32:34,861 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 18:32:35,176 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 18:32:35,564 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 18:32:35,963 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 18:32:36,449 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 18:32:37,286 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:32:38,287 WARN L193 SmtUtils]: Spent 284.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:32:39,404 WARN L193 SmtUtils]: Spent 290.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:32:40,638 WARN L193 SmtUtils]: Spent 297.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:32:41,879 WARN L193 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:32:43,271 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:32:45,455 WARN L193 SmtUtils]: Spent 518.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 18:32:47,706 INFO L134 CoverageAnalysis]: Checked inductivity of 788 backedges. 28 proven. 392 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-20 18:32:47,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:32:49,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:33:38,092 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 18:34:11,079 INFO L134 CoverageAnalysis]: Checked inductivity of 788 backedges. 28 proven. 392 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-20 18:34:11,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1377063016] [2020-07-20 18:34:11,080 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:34:11,080 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 34 [2020-07-20 18:34:11,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539251576] [2020-07-20 18:34:11,081 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-20 18:34:11,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:34:11,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-20 18:34:11,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1032, Unknown=1, NotChecked=0, Total=1122 [2020-07-20 18:34:11,082 INFO L87 Difference]: Start difference. First operand 492 states and 586 transitions. Second operand 34 states. [2020-07-20 18:34:26,337 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 13