/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_FUNCTIONS --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/recursive-simple/fibo_2calls_8-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:34:47,817 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:34:47,820 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:34:47,833 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:34:47,833 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:34:47,834 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:34:47,835 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:34:47,837 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:34:47,839 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:34:47,840 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:34:47,841 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:34:47,842 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:34:47,842 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:34:47,843 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:34:47,844 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:34:47,845 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:34:47,846 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:34:47,847 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:34:47,849 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:34:47,851 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:34:47,853 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:34:47,854 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:34:47,855 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:34:47,856 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:34:47,858 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:34:47,866 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:34:47,867 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:34:47,867 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:34:47,868 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 13:34:47,887 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:34:47,887 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:34:47,888 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:34:47,888 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:34:47,889 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:34:47,889 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:34:47,889 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:34:47,889 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:34:47,889 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:34:47,890 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:34:47,890 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:34:47,890 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:34:47,890 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:34:47,890 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:34:47,891 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:34:47,891 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:34:47,891 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:34:47,891 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:34:47,891 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:34:47,892 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:34:47,892 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:34:47,892 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:34:47,892 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:34:47,893 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:34:47,893 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:34:47,893 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:34:47,893 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:47,893 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:34:47,894 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:34:47,894 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_FUNCTIONS 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 13:34:48,216 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:34:48,230 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:34:48,234 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:34:48,235 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:34:48,236 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:34:48,236 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_8-1.c [2020-07-20 13:34:48,301 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/991fe404b/284a7748a60b42b8a931b98931e3fcca/FLAG799a97802 [2020-07-20 13:34:48,743 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:34:48,744 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_8-1.c [2020-07-20 13:34:48,753 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/991fe404b/284a7748a60b42b8a931b98931e3fcca/FLAG799a97802 [2020-07-20 13:34:49,120 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/991fe404b/284a7748a60b42b8a931b98931e3fcca [2020-07-20 13:34:49,133 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:34:49,138 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:34:49,141 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:34:49,141 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:34:49,145 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:34:49,146 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,150 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@72c4c8c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49, skipping insertion in model container [2020-07-20 13:34:49,150 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,161 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:34:49,186 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:34:49,407 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:34:49,411 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:34:49,429 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:34:49,445 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:34:49,446 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49 WrapperNode [2020-07-20 13:34:49,446 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:34:49,447 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:34:49,447 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:34:49,447 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:34:49,461 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,461 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,467 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,468 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,567 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,570 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,571 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (1/1) ... [2020-07-20 13:34:49,573 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:34:49,573 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:34:49,573 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:34:49,573 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:34:49,574 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (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 13:34:49,647 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:34:49,647 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:34:49,647 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 13:34:49,647 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 13:34:49,648 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:34:49,649 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:34:49,649 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:34:49,650 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 13:34:49,650 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 13:34:49,650 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:34:49,652 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:34:49,652 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:34:49,892 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:34:49,892 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:34:49,896 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:34:49 BoogieIcfgContainer [2020-07-20 13:34:49,897 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:34:49,898 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:34:49,898 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:34:49,901 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:34:49,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:34:49" (1/3) ... [2020-07-20 13:34:49,903 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46bd518c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:34:49, skipping insertion in model container [2020-07-20 13:34:49,903 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:49" (2/3) ... [2020-07-20 13:34:49,903 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46bd518c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:34:49, skipping insertion in model container [2020-07-20 13:34:49,904 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:34:49" (3/3) ... [2020-07-20 13:34:49,905 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_8-1.c [2020-07-20 13:34:49,916 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:34:49,924 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:34:49,938 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:34:49,963 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:34:49,963 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:34:49,964 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:34:49,964 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:34:49,964 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:34:49,964 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:34:49,964 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:34:49,964 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:34:49,980 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 13:34:49,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:34:49,987 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:49,988 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:49,988 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:49,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:49,994 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 13:34:50,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:50,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1825704229] [2020-07-20 13:34:50,001 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 13:34:50,060 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:50,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:50,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:34:50,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:50,176 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:34:50,177 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:34:50,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1825704229] [2020-07-20 13:34:50,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:34:50,179 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:34:50,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638143736] [2020-07-20 13:34:50,186 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:34:50,186 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:50,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:34:50,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:34:50,205 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 13:34:50,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:50,337 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 13:34:50,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:34:50,339 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:34:50,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:50,349 INFO L225 Difference]: With dead ends: 44 [2020-07-20 13:34:50,350 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 13:34:50,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:34:50,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 13:34:50,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 13:34:50,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 13:34:50,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 13:34:50,404 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 13:34:50,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:50,405 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 13:34:50,405 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:34:50,405 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 13:34:50,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 13:34:50,407 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:50,407 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:50,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:50,622 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:50,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:50,623 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 13:34:50,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:50,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [181034006] [2020-07-20 13:34:50,624 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 13:34:50,666 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:50,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:50,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:34:50,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:50,743 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:34:50,744 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:34:50,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [181034006] [2020-07-20 13:34:50,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:34:50,746 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:34:50,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595955352] [2020-07-20 13:34:50,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:34:50,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:50,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:34:50,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:34:50,752 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 13:34:50,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:50,888 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 13:34:50,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:34:50,889 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 13:34:50,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:50,891 INFO L225 Difference]: With dead ends: 36 [2020-07-20 13:34:50,891 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 13:34:50,893 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:34:50,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 13:34:50,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 13:34:50,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 13:34:50,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 13:34:50,905 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 13:34:50,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:50,906 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 13:34:50,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:34:50,906 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 13:34:50,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:34:50,908 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:50,908 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:51,122 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:51,123 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:51,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:51,125 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 13:34:51,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:51,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2106677709] [2020-07-20 13:34:51,127 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 13:34:51,164 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:51,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:51,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:34:51,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:51,256 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:34:51,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:51,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:51,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:51,582 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:34:51,583 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2106677709] [2020-07-20 13:34:51,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:51,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 13:34:51,584 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914300062] [2020-07-20 13:34:51,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 13:34:51,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:51,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 13:34:51,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 13:34:51,592 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 13:34:51,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:51,815 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 13:34:51,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:34:51,816 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 13:34:51,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:51,820 INFO L225 Difference]: With dead ends: 41 [2020-07-20 13:34:51,820 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 13:34:51,821 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:34:51,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 13:34:51,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 13:34:51,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 13:34:51,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 13:34:51,833 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 13:34:51,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:51,834 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 13:34:51,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 13:34:51,834 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 13:34:51,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:34:51,836 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:51,836 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:52,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:52,052 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:52,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:52,053 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 13:34:52,053 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:52,054 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [165098714] [2020-07-20 13:34:52,055 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 13:34:52,104 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:52,105 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:52,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:34:52,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:52,198 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:34:52,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:52,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:52,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:52,469 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:34:52,469 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [165098714] [2020-07-20 13:34:52,470 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:52,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 13:34:52,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608518195] [2020-07-20 13:34:52,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 13:34:52,471 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:52,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 13:34:52,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 13:34:52,474 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 13:34:52,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:52,627 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 13:34:52,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:34:52,628 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 13:34:52,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:52,630 INFO L225 Difference]: With dead ends: 46 [2020-07-20 13:34:52,630 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 13:34:52,631 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:34:52,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 13:34:52,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 13:34:52,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 13:34:52,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 13:34:52,643 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 13:34:52,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:52,643 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 13:34:52,643 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 13:34:52,643 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 13:34:52,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 13:34:52,646 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:52,646 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:52,860 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:52,862 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:52,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:52,863 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 13:34:52,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:52,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [712517528] [2020-07-20 13:34:52,865 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 13:34:52,906 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:52,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:52,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:34:52,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:52,979 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 13:34:52,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:53,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:53,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:53,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:53,407 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:34:53,408 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [712517528] [2020-07-20 13:34:53,408 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:53,409 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 13:34:53,409 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582801572] [2020-07-20 13:34:53,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:34:53,410 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:53,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:34:53,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:34:53,411 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 13:34:53,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:53,660 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 13:34:53,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:34:53,661 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 13:34:53,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:53,663 INFO L225 Difference]: With dead ends: 51 [2020-07-20 13:34:53,663 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 13:34:53,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:34:53,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 13:34:53,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 13:34:53,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 13:34:53,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 13:34:53,678 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 13:34:53,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:53,679 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 13:34:53,679 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:34:53,679 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 13:34:53,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 13:34:53,681 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:53,681 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:53,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:53,888 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:53,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:53,888 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 13:34:53,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:53,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [237241537] [2020-07-20 13:34:53,890 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 13:34:53,923 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:53,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:53,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:34:53,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:53,981 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 13:34:53,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:54,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:54,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:54,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:54,366 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:34:54,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [237241537] [2020-07-20 13:34:54,367 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:54,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 13:34:54,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641738180] [2020-07-20 13:34:54,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:34:54,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:54,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:34:54,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:34:54,370 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 13:34:54,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:54,572 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-20 13:34:54,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:34:54,578 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 13:34:54,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:54,580 INFO L225 Difference]: With dead ends: 56 [2020-07-20 13:34:54,581 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 13:34:54,587 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:34:54,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 13:34:54,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-20 13:34:54,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 13:34:54,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 13:34:54,613 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-20 13:34:54,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:54,616 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 13:34:54,617 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:34:54,617 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 13:34:54,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 13:34:54,624 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:54,624 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 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 13:34:54,825 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:54,825 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:54,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:54,826 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-20 13:34:54,826 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:54,826 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2146397785] [2020-07-20 13:34:54,826 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 13:34:54,880 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:54,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:54,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:34:54,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:54,977 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 13:34:54,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:55,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:55,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:55,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:55,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:55,648 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 13:34:55,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2146397785] [2020-07-20 13:34:55,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:55,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 13:34:55,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66141901] [2020-07-20 13:34:55,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:34:55,652 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:55,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:34:55,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:34:55,653 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-20 13:34:55,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:55,901 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-20 13:34:55,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:34:55,901 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-20 13:34:55,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:55,904 INFO L225 Difference]: With dead ends: 61 [2020-07-20 13:34:55,905 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 13:34:55,907 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:34:55,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 13:34:55,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-20 13:34:55,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 13:34:55,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 13:34:55,925 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-20 13:34:55,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:55,926 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 13:34:55,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:34:55,926 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 13:34:55,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 13:34:55,929 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:55,929 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 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 13:34:56,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:56,145 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:56,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:56,146 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 13:34:56,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:56,148 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [952680288] [2020-07-20 13:34:56,148 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 13:34:56,190 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:56,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:56,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:34:56,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:56,295 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-20 13:34:56,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:56,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,918 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 13:34:56,918 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [952680288] [2020-07-20 13:34:56,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:56,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 13:34:56,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252788601] [2020-07-20 13:34:56,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:34:56,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:56,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:34:56,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:34:56,921 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-20 13:34:57,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:57,143 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-20 13:34:57,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:34:57,144 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-20 13:34:57,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:57,147 INFO L225 Difference]: With dead ends: 66 [2020-07-20 13:34:57,147 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 13:34:57,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:34:57,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 13:34:57,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-20 13:34:57,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 13:34:57,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 13:34:57,161 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-20 13:34:57,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:57,161 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 13:34:57,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:34:57,162 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 13:34:57,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 13:34:57,164 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:57,164 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:57,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:57,380 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:57,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:57,381 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-20 13:34:57,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:57,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [397883722] [2020-07-20 13:34:57,383 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 13:34:57,439 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:57,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:57,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:34:57,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:57,541 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 13:34:57,542 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:58,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,587 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-20 13:34:58,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [397883722] [2020-07-20 13:34:58,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:58,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 13:34:58,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300997953] [2020-07-20 13:34:58,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 13:34:58,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:58,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 13:34:58,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 13:34:58,590 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-20 13:34:58,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:58,892 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-20 13:34:58,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:34:58,893 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-20 13:34:58,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:58,895 INFO L225 Difference]: With dead ends: 71 [2020-07-20 13:34:58,896 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 13:34:58,897 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:34:58,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 13:34:58,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-20 13:34:58,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 13:34:58,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 13:34:58,911 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-20 13:34:58,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:58,912 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 13:34:58,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 13:34:58,912 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 13:34:58,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 13:34:58,914 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:58,914 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:59,138 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:59,139 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:59,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:59,140 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-20 13:34:59,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:59,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [419478019] [2020-07-20 13:34:59,142 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 13:34:59,213 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:59,214 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:59,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:34:59,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:59,329 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-20 13:34:59,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:59,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:00,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:00,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:00,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:00,410 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-20 13:35:00,410 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [419478019] [2020-07-20 13:35:00,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:00,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 13:35:00,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065370942] [2020-07-20 13:35:00,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 13:35:00,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:00,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 13:35:00,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 13:35:00,417 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 16 states. [2020-07-20 13:35:00,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:00,741 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-20 13:35:00,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:35:00,742 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 108 [2020-07-20 13:35:00,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:00,744 INFO L225 Difference]: With dead ends: 76 [2020-07-20 13:35:00,745 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 13:35:00,748 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:35:00,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 13:35:00,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-20 13:35:00,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 13:35:00,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 13:35:00,782 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-20 13:35:00,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:00,783 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 13:35:00,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 13:35:00,784 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 13:35:00,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-20 13:35:00,792 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:00,792 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:01,007 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:01,008 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:01,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:01,009 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-20 13:35:01,009 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:01,010 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1599987822] [2020-07-20 13:35:01,010 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 13:35:01,111 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:01,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:01,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:35:01,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:01,222 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-20 13:35:01,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:02,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:03,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:03,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:03,120 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-20 13:35:03,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1599987822] [2020-07-20 13:35:03,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:03,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 13:35:03,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905286218] [2020-07-20 13:35:03,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 13:35:03,123 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:03,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 13:35:03,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:35:03,124 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 18 states. [2020-07-20 13:35:03,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:03,463 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-20 13:35:03,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:35:03,463 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 208 [2020-07-20 13:35:03,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:03,467 INFO L225 Difference]: With dead ends: 81 [2020-07-20 13:35:03,468 INFO L226 Difference]: Without dead ends: 77 [2020-07-20 13:35:03,469 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:35:03,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-20 13:35:03,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-20 13:35:03,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 13:35:03,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 13:35:03,483 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-20 13:35:03,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:03,484 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 13:35:03,484 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 13:35:03,484 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 13:35:03,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 13:35:03,486 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:03,486 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:03,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:03,696 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:03,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:03,697 INFO L82 PathProgramCache]: Analyzing trace with hash 1180347891, now seen corresponding path program 2 times [2020-07-20 13:35:03,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:03,698 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [102048235] [2020-07-20 13:35:03,698 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 13:35:03,779 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:03,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:03,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:35:03,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:03,865 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 149 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-20 13:35:03,865 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:04,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:05,486 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 165 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2020-07-20 13:35:05,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [102048235] [2020-07-20 13:35:05,487 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:05,487 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 13:35:05,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826178785] [2020-07-20 13:35:05,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 13:35:05,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:05,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 13:35:05,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:35:05,491 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 18 states. [2020-07-20 13:35:05,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:05,847 INFO L93 Difference]: Finished difference Result 86 states and 174 transitions. [2020-07-20 13:35:05,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:35:05,848 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 121 [2020-07-20 13:35:05,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:05,852 INFO L225 Difference]: With dead ends: 86 [2020-07-20 13:35:05,852 INFO L226 Difference]: Without dead ends: 82 [2020-07-20 13:35:05,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 214 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:35:05,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-20 13:35:05,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-07-20 13:35:05,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 13:35:05,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 13:35:05,880 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 121 [2020-07-20 13:35:05,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:05,881 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 13:35:05,881 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 13:35:05,881 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 13:35:05,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2020-07-20 13:35:05,887 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:05,887 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 11, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:06,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:06,096 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:06,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:06,098 INFO L82 PathProgramCache]: Analyzing trace with hash 2099307065, now seen corresponding path program 5 times [2020-07-20 13:35:06,098 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:06,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1098925598] [2020-07-20 13:35:06,099 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 13:35:06,244 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:06,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:06,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:35:06,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:06,371 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 331 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-07-20 13:35:06,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:07,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:07,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,945 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 352 refuted. 0 times theorem prover too weak. 609 trivial. 0 not checked. [2020-07-20 13:35:08,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1098925598] [2020-07-20 13:35:08,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:08,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 13:35:08,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830300748] [2020-07-20 13:35:08,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 13:35:08,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:08,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 13:35:08,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:35:08,948 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 20 states. [2020-07-20 13:35:09,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:09,423 INFO L93 Difference]: Finished difference Result 91 states and 192 transitions. [2020-07-20 13:35:09,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:35:09,423 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 195 [2020-07-20 13:35:09,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:09,426 INFO L225 Difference]: With dead ends: 91 [2020-07-20 13:35:09,427 INFO L226 Difference]: Without dead ends: 87 [2020-07-20 13:35:09,428 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 359 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:35:09,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-20 13:35:09,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 60. [2020-07-20 13:35:09,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 13:35:09,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 13:35:09,440 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 195 [2020-07-20 13:35:09,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:09,441 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 13:35:09,441 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 13:35:09,441 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 13:35:09,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-20 13:35:09,444 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:09,444 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 12, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:09,657 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:09,658 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:09,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:09,659 INFO L82 PathProgramCache]: Analyzing trace with hash 266210309, now seen corresponding path program 3 times [2020-07-20 13:35:09,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:09,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [553844996] [2020-07-20 13:35:09,660 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 13:35:09,789 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:09,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:09,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:35:09,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:09,916 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 347 refuted. 0 times theorem prover too weak. 658 trivial. 0 not checked. [2020-07-20 13:35:09,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:11,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,741 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 371 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2020-07-20 13:35:12,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [553844996] [2020-07-20 13:35:12,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:12,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:35:12,742 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270421154] [2020-07-20 13:35:12,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:35:12,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:12,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:35:12,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:35:12,744 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 19 states. [2020-07-20 13:35:13,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:13,175 INFO L93 Difference]: Finished difference Result 96 states and 212 transitions. [2020-07-20 13:35:13,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:35:13,176 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 201 [2020-07-20 13:35:13,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:13,182 INFO L225 Difference]: With dead ends: 96 [2020-07-20 13:35:13,182 INFO L226 Difference]: Without dead ends: 92 [2020-07-20 13:35:13,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 370 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:35:13,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-07-20 13:35:13,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 60. [2020-07-20 13:35:13,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 13:35:13,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 13:35:13,210 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 201 [2020-07-20 13:35:13,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:13,211 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 13:35:13,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:35:13,212 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 13:35:13,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-20 13:35:13,221 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:13,221 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 22, 21, 21, 16, 16, 16, 16, 16, 16, 16, 16, 10, 10, 10, 10, 10, 10, 10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:13,434 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:13,435 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:13,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:13,436 INFO L82 PathProgramCache]: Analyzing trace with hash -865443995, now seen corresponding path program 6 times [2020-07-20 13:35:13,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:13,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1483920694] [2020-07-20 13:35:13,437 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 13:35:13,639 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:13,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:13,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 641 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:35:13,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:13,815 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 819 refuted. 0 times theorem prover too weak. 2713 trivial. 0 not checked. [2020-07-20 13:35:13,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:16,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:16,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:16,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:16,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:17,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:17,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:17,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:17,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:17,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:17,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:18,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:18,149 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 849 refuted. 0 times theorem prover too weak. 2683 trivial. 0 not checked. [2020-07-20 13:35:18,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1483920694] [2020-07-20 13:35:18,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:18,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:35:18,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656354986] [2020-07-20 13:35:18,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:35:18,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:18,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:35:18,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:35:18,153 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 21 states. [2020-07-20 13:35:18,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:18,761 INFO L93 Difference]: Finished difference Result 101 states and 232 transitions. [2020-07-20 13:35:18,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:35:18,762 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 351 [2020-07-20 13:35:18,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:18,769 INFO L225 Difference]: With dead ends: 101 [2020-07-20 13:35:18,769 INFO L226 Difference]: Without dead ends: 97 [2020-07-20 13:35:18,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 667 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:35:18,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-20 13:35:18,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 65. [2020-07-20 13:35:18,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 13:35:18,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-20 13:35:18,801 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 351 [2020-07-20 13:35:18,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:18,803 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-20 13:35:18,803 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:35:18,804 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-20 13:35:18,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2020-07-20 13:35:18,810 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:18,811 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 19, 17, 17, 13, 13, 13, 13, 13, 13, 13, 13, 11, 8, 8, 8, 8, 8, 8, 8, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:19,024 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:19,025 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:19,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:19,026 INFO L82 PathProgramCache]: Analyzing trace with hash -1494010988, now seen corresponding path program 3 times [2020-07-20 13:35:19,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:19,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1587181871] [2020-07-20 13:35:19,026 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 13:35:19,236 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:19,237 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:19,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:35:19,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:19,491 INFO L134 CoverageAnalysis]: Checked inductivity of 2517 backedges. 124 proven. 533 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 13:35:19,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:21,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:21,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:21,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:21,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:22,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:22,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:22,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:22,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:22,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:22,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:22,938 INFO L134 CoverageAnalysis]: Checked inductivity of 2517 backedges. 124 proven. 554 refuted. 0 times theorem prover too weak. 1839 trivial. 0 not checked. [2020-07-20 13:35:22,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1587181871] [2020-07-20 13:35:22,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:22,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:35:22,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905248611] [2020-07-20 13:35:22,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:35:22,950 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:22,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:35:22,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:35:22,951 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 19 states. [2020-07-20 13:35:23,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:23,420 INFO L93 Difference]: Finished difference Result 129 states and 362 transitions. [2020-07-20 13:35:23,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:35:23,421 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 297 [2020-07-20 13:35:23,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:23,426 INFO L225 Difference]: With dead ends: 129 [2020-07-20 13:35:23,426 INFO L226 Difference]: Without dead ends: 125 [2020-07-20 13:35:23,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 562 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:35:23,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-07-20 13:35:23,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 67. [2020-07-20 13:35:23,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-07-20 13:35:23,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 120 transitions. [2020-07-20 13:35:23,465 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 120 transitions. Word has length 297 [2020-07-20 13:35:23,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:23,468 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 120 transitions. [2020-07-20 13:35:23,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:35:23,469 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 120 transitions. [2020-07-20 13:35:23,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2020-07-20 13:35:23,473 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:23,473 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 25, 25, 25, 23, 17, 17, 17, 17, 17, 17, 17, 12, 12, 12, 12, 12, 12, 12, 11, 11, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:23,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:23,687 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:23,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:23,688 INFO L82 PathProgramCache]: Analyzing trace with hash -948476032, now seen corresponding path program 1 times [2020-07-20 13:35:23,689 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:23,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [942883399] [2020-07-20 13:35:23,690 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 13:35:23,941 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:23,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:23,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 744 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:35:23,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:24,254 INFO L134 CoverageAnalysis]: Checked inductivity of 4805 backedges. 168 proven. 707 refuted. 0 times theorem prover too weak. 3930 trivial. 0 not checked. [2020-07-20 13:35:24,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:25,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:26,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:26,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:26,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:26,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:26,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:27,038 INFO L134 CoverageAnalysis]: Checked inductivity of 4805 backedges. 168 proven. 723 refuted. 0 times theorem prover too weak. 3914 trivial. 0 not checked. [2020-07-20 13:35:27,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [942883399] [2020-07-20 13:35:27,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:27,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:35:27,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833603831] [2020-07-20 13:35:27,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:35:27,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:27,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:35:27,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:27,042 INFO L87 Difference]: Start difference. First operand 67 states and 120 transitions. Second operand 17 states. [2020-07-20 13:35:27,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:27,482 INFO L93 Difference]: Finished difference Result 139 states and 413 transitions. [2020-07-20 13:35:27,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:35:27,483 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 409 [2020-07-20 13:35:27,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:27,488 INFO L225 Difference]: With dead ends: 139 [2020-07-20 13:35:27,488 INFO L226 Difference]: Without dead ends: 135 [2020-07-20 13:35:27,490 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 824 GetRequests, 790 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:35:27,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-07-20 13:35:27,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 69. [2020-07-20 13:35:27,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-07-20 13:35:27,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 127 transitions. [2020-07-20 13:35:27,514 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 127 transitions. Word has length 409 [2020-07-20 13:35:27,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:27,515 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 127 transitions. [2020-07-20 13:35:27,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:35:27,516 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 127 transitions. [2020-07-20 13:35:27,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 532 [2020-07-20 13:35:27,521 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:27,521 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 33, 33, 32, 30, 22, 22, 22, 22, 22, 22, 22, 16, 16, 16, 16, 16, 16, 16, 14, 14, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:27,734 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:27,735 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:27,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:27,735 INFO L82 PathProgramCache]: Analyzing trace with hash -1385064961, now seen corresponding path program 1 times [2020-07-20 13:35:27,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:27,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [574042171] [2020-07-20 13:35:27,736 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 13:35:28,047 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:28,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:28,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 963 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:35:28,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:28,314 INFO L134 CoverageAnalysis]: Checked inductivity of 8231 backedges. 323 proven. 1216 refuted. 0 times theorem prover too weak. 6692 trivial. 0 not checked. [2020-07-20 13:35:28,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:30,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:32,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:32,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:32,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:33,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:33,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:33,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:33,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:33,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:33,615 INFO L134 CoverageAnalysis]: Checked inductivity of 8231 backedges. 327 proven. 1245 refuted. 0 times theorem prover too weak. 6659 trivial. 0 not checked. [2020-07-20 13:35:33,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [574042171] [2020-07-20 13:35:33,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:33,616 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:35:33,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538473939] [2020-07-20 13:35:33,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:35:33,618 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:33,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:35:33,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:35:33,619 INFO L87 Difference]: Start difference. First operand 69 states and 127 transitions. Second operand 21 states. [2020-07-20 13:35:34,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:34,430 INFO L93 Difference]: Finished difference Result 166 states and 566 transitions. [2020-07-20 13:35:34,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:35:34,431 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 531 [2020-07-20 13:35:34,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:34,434 INFO L225 Difference]: With dead ends: 166 [2020-07-20 13:35:34,434 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 13:35:34,437 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1069 GetRequests, 1025 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:35:34,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 13:35:34,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-07-20 13:35:34,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-07-20 13:35:34,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 146 transitions. [2020-07-20 13:35:34,451 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 146 transitions. Word has length 531 [2020-07-20 13:35:34,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:34,452 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 146 transitions. [2020-07-20 13:35:34,453 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:35:34,453 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 146 transitions. [2020-07-20 13:35:34,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 512 [2020-07-20 13:35:34,459 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:34,459 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 37, 28, 26, 19, 19, 19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 18, 18, 11, 10, 10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:34,674 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:34,675 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:34,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:34,676 INFO L82 PathProgramCache]: Analyzing trace with hash 2146290224, now seen corresponding path program 2 times [2020-07-20 13:35:34,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:34,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [358103434] [2020-07-20 13:35:34,677 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 13:35:35,015 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:35,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:35,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 928 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:35:35,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:35,351 INFO L134 CoverageAnalysis]: Checked inductivity of 7475 backedges. 270 proven. 993 refuted. 0 times theorem prover too weak. 6212 trivial. 0 not checked. [2020-07-20 13:35:35,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:37,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:37,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:38,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:38,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:38,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:39,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:39,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:39,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:39,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:39,546 INFO L134 CoverageAnalysis]: Checked inductivity of 7475 backedges. 270 proven. 1014 refuted. 0 times theorem prover too weak. 6191 trivial. 0 not checked. [2020-07-20 13:35:39,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [358103434] [2020-07-20 13:35:39,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:39,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:35:39,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230506199] [2020-07-20 13:35:39,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:35:39,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:39,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:35:39,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:35:39,549 INFO L87 Difference]: Start difference. First operand 88 states and 146 transitions. Second operand 19 states. [2020-07-20 13:35:40,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:40,045 INFO L93 Difference]: Finished difference Result 167 states and 414 transitions. [2020-07-20 13:35:40,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:35:40,046 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 511 [2020-07-20 13:35:40,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:40,053 INFO L225 Difference]: With dead ends: 167 [2020-07-20 13:35:40,054 INFO L226 Difference]: Without dead ends: 153 [2020-07-20 13:35:40,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1028 GetRequests, 989 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:35:40,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2020-07-20 13:35:40,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 94. [2020-07-20 13:35:40,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-20 13:35:40,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 160 transitions. [2020-07-20 13:35:40,082 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 160 transitions. Word has length 511 [2020-07-20 13:35:40,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:40,083 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 160 transitions. [2020-07-20 13:35:40,083 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:35:40,083 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 160 transitions. [2020-07-20 13:35:40,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 434 [2020-07-20 13:35:40,089 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:40,090 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 29, 29, 24, 24, 17, 17, 17, 17, 17, 17, 17, 14, 14, 14, 14, 14, 14, 14, 10, 10, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:40,303 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:40,304 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:40,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:40,305 INFO L82 PathProgramCache]: Analyzing trace with hash 477279642, now seen corresponding path program 3 times [2020-07-20 13:35:40,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:40,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1844282125] [2020-07-20 13:35:40,306 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 13:35:40,642 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:40,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:40,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 788 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:35:40,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:40,858 INFO L134 CoverageAnalysis]: Checked inductivity of 5328 backedges. 238 proven. 689 refuted. 0 times theorem prover too weak. 4401 trivial. 0 not checked. [2020-07-20 13:35:40,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:42,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:42,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,899 INFO L134 CoverageAnalysis]: Checked inductivity of 5328 backedges. 238 proven. 705 refuted. 0 times theorem prover too weak. 4385 trivial. 0 not checked. [2020-07-20 13:35:43,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1844282125] [2020-07-20 13:35:43,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:43,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:35:43,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790012918] [2020-07-20 13:35:43,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:35:43,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:43,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:35:43,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:43,902 INFO L87 Difference]: Start difference. First operand 94 states and 160 transitions. Second operand 17 states. [2020-07-20 13:35:44,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:44,286 INFO L93 Difference]: Finished difference Result 173 states and 423 transitions. [2020-07-20 13:35:44,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:35:44,287 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 433 [2020-07-20 13:35:44,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:44,292 INFO L225 Difference]: With dead ends: 173 [2020-07-20 13:35:44,292 INFO L226 Difference]: Without dead ends: 158 [2020-07-20 13:35:44,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 871 GetRequests, 837 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:35:44,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2020-07-20 13:35:44,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 101. [2020-07-20 13:35:44,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-07-20 13:35:44,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 180 transitions. [2020-07-20 13:35:44,315 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 180 transitions. Word has length 433 [2020-07-20 13:35:44,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:44,316 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 180 transitions. [2020-07-20 13:35:44,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:35:44,316 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 180 transitions. [2020-07-20 13:35:44,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 367 [2020-07-20 13:35:44,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:44,320 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 25, 25, 22, 19, 14, 14, 14, 14, 14, 14, 14, 12, 12, 12, 12, 12, 12, 12, 9, 8, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:44,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:44,534 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:44,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:44,534 INFO L82 PathProgramCache]: Analyzing trace with hash 521895211, now seen corresponding path program 4 times [2020-07-20 13:35:44,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:44,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [666788328] [2020-07-20 13:35:44,535 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 13:35:44,872 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:44,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:44,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:35:44,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:45,148 INFO L134 CoverageAnalysis]: Checked inductivity of 3742 backedges. 283 proven. 708 refuted. 0 times theorem prover too weak. 2751 trivial. 0 not checked. [2020-07-20 13:35:45,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:47,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:48,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:49,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:49,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:49,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:49,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:49,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:49,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:49,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:49,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:49,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:49,981 INFO L134 CoverageAnalysis]: Checked inductivity of 3742 backedges. 285 proven. 739 refuted. 0 times theorem prover too weak. 2718 trivial. 0 not checked. [2020-07-20 13:35:49,981 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [666788328] [2020-07-20 13:35:49,982 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:49,982 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:35:49,982 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562181732] [2020-07-20 13:35:49,983 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:35:49,983 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:49,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:35:49,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:35:49,984 INFO L87 Difference]: Start difference. First operand 101 states and 180 transitions. Second operand 21 states. [2020-07-20 13:35:50,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:50,745 INFO L93 Difference]: Finished difference Result 198 states and 537 transitions. [2020-07-20 13:35:50,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:35:50,747 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 366 [2020-07-20 13:35:50,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:50,750 INFO L225 Difference]: With dead ends: 198 [2020-07-20 13:35:50,750 INFO L226 Difference]: Without dead ends: 112 [2020-07-20 13:35:50,754 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 739 GetRequests, 695 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:35:50,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-20 13:35:50,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 106. [2020-07-20 13:35:50,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-07-20 13:35:50,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 192 transitions. [2020-07-20 13:35:50,775 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 192 transitions. Word has length 366 [2020-07-20 13:35:50,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:50,776 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 192 transitions. [2020-07-20 13:35:50,776 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:35:50,777 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 192 transitions. [2020-07-20 13:35:50,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 417 [2020-07-20 13:35:50,781 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:50,782 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 22, 21, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 9, 9, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:50,995 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:50,996 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:50,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:50,997 INFO L82 PathProgramCache]: Analyzing trace with hash -1116898987, now seen corresponding path program 5 times [2020-07-20 13:35:50,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:50,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119696081] [2020-07-20 13:35:50,997 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 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:51,404 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:51,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:51,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 755 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:35:51,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:51,594 INFO L134 CoverageAnalysis]: Checked inductivity of 4881 backedges. 232 proven. 770 refuted. 0 times theorem prover too weak. 3879 trivial. 0 not checked. [2020-07-20 13:35:51,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:53,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:53,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:54,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:54,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:54,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:54,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:55,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:55,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:55,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:55,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:55,527 INFO L134 CoverageAnalysis]: Checked inductivity of 4881 backedges. 234 proven. 789 refuted. 0 times theorem prover too weak. 3858 trivial. 0 not checked. [2020-07-20 13:35:55,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119696081] [2020-07-20 13:35:55,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:55,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:35:55,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65157566] [2020-07-20 13:35:55,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:35:55,529 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:55,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:35:55,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:35:55,530 INFO L87 Difference]: Start difference. First operand 106 states and 192 transitions. Second operand 19 states. [2020-07-20 13:35:55,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:55,977 INFO L93 Difference]: Finished difference Result 172 states and 408 transitions. [2020-07-20 13:35:55,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:35:55,982 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 416 [2020-07-20 13:35:55,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:55,986 INFO L225 Difference]: With dead ends: 172 [2020-07-20 13:35:55,986 INFO L226 Difference]: Without dead ends: 157 [2020-07-20 13:35:55,989 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 838 GetRequests, 799 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:35:55,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2020-07-20 13:35:56,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 109. [2020-07-20 13:35:56,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-07-20 13:35:56,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 192 transitions. [2020-07-20 13:35:56,008 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 192 transitions. Word has length 416 [2020-07-20 13:35:56,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:56,009 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 192 transitions. [2020-07-20 13:35:56,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:35:56,009 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 192 transitions. [2020-07-20 13:35:56,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 339 [2020-07-20 13:35:56,013 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:56,013 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 20, 17, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 8, 7, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:56,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:56,228 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:56,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:56,229 INFO L82 PathProgramCache]: Analyzing trace with hash 2008083101, now seen corresponding path program 6 times [2020-07-20 13:35:56,229 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:56,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [761856373] [2020-07-20 13:35:56,230 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 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:56,607 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:56,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:56,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 615 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:35:56,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:56,754 INFO L134 CoverageAnalysis]: Checked inductivity of 3158 backedges. 195 proven. 485 refuted. 0 times theorem prover too weak. 2478 trivial. 0 not checked. [2020-07-20 13:35:56,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:58,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:58,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:58,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:59,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:59,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:59,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:59,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:59,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:59,542 INFO L134 CoverageAnalysis]: Checked inductivity of 3158 backedges. 195 proven. 499 refuted. 0 times theorem prover too weak. 2464 trivial. 0 not checked. [2020-07-20 13:35:59,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [761856373] [2020-07-20 13:35:59,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:59,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:35:59,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169437422] [2020-07-20 13:35:59,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:35:59,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:59,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:35:59,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:59,544 INFO L87 Difference]: Start difference. First operand 109 states and 192 transitions. Second operand 17 states. [2020-07-20 13:36:00,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:00,005 INFO L93 Difference]: Finished difference Result 190 states and 442 transitions. [2020-07-20 13:36:00,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:36:00,007 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 338 [2020-07-20 13:36:00,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:00,010 INFO L225 Difference]: With dead ends: 190 [2020-07-20 13:36:00,011 INFO L226 Difference]: Without dead ends: 178 [2020-07-20 13:36:00,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 681 GetRequests, 647 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:36:00,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-20 13:36:00,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 109. [2020-07-20 13:36:00,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-07-20 13:36:00,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 192 transitions. [2020-07-20 13:36:00,040 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 192 transitions. Word has length 338 [2020-07-20 13:36:00,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:00,040 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 192 transitions. [2020-07-20 13:36:00,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:36:00,041 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 192 transitions. [2020-07-20 13:36:00,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 397 [2020-07-20 13:36:00,045 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:00,046 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 25, 22, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 11, 8, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:00,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:00,262 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:00,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:00,263 INFO L82 PathProgramCache]: Analyzing trace with hash 47916389, now seen corresponding path program 7 times [2020-07-20 13:36:00,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:00,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1394885834] [2020-07-20 13:36:00,265 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 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:00,643 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:00,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:00,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:36:00,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:00,876 INFO L134 CoverageAnalysis]: Checked inductivity of 4395 backedges. 403 proven. 684 refuted. 0 times theorem prover too weak. 3308 trivial. 0 not checked. [2020-07-20 13:36:00,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:03,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:04,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:05,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:05,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:05,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:05,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:05,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:05,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:05,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:05,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:05,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:05,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:06,162 INFO L134 CoverageAnalysis]: Checked inductivity of 4395 backedges. 405 proven. 715 refuted. 0 times theorem prover too weak. 3275 trivial. 0 not checked. [2020-07-20 13:36:06,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1394885834] [2020-07-20 13:36:06,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:06,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:36:06,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297638699] [2020-07-20 13:36:06,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:36:06,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:06,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:36:06,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:36:06,164 INFO L87 Difference]: Start difference. First operand 109 states and 192 transitions. Second operand 21 states. [2020-07-20 13:36:06,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:06,806 INFO L93 Difference]: Finished difference Result 145 states and 272 transitions. [2020-07-20 13:36:06,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:36:06,807 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 396 [2020-07-20 13:36:06,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:06,810 INFO L225 Difference]: With dead ends: 145 [2020-07-20 13:36:06,811 INFO L226 Difference]: Without dead ends: 117 [2020-07-20 13:36:06,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 799 GetRequests, 755 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:36:06,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-20 13:36:06,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2020-07-20 13:36:06,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-07-20 13:36:06,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 201 transitions. [2020-07-20 13:36:06,827 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 201 transitions. Word has length 396 [2020-07-20 13:36:06,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:06,827 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 201 transitions. [2020-07-20 13:36:06,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:36:06,827 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 201 transitions. [2020-07-20 13:36:06,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 437 [2020-07-20 13:36:06,832 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:06,833 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 30, 30, 27, 24, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 12, 8, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:07,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:07,047 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:07,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:07,048 INFO L82 PathProgramCache]: Analyzing trace with hash -178113026, now seen corresponding path program 8 times [2020-07-20 13:36:07,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:07,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [241719302] [2020-07-20 13:36:07,049 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 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:07,452 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:07,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:07,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 789 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:36:07,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:07,657 INFO L134 CoverageAnalysis]: Checked inductivity of 5379 backedges. 261 proven. 667 refuted. 0 times theorem prover too weak. 4451 trivial. 0 not checked. [2020-07-20 13:36:07,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:09,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:10,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:10,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:10,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:10,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:10,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:10,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:10,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:10,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:11,090 INFO L134 CoverageAnalysis]: Checked inductivity of 5379 backedges. 263 proven. 681 refuted. 0 times theorem prover too weak. 4435 trivial. 0 not checked. [2020-07-20 13:36:11,091 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [241719302] [2020-07-20 13:36:11,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:11,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:36:11,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640006071] [2020-07-20 13:36:11,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:36:11,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:11,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:36:11,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:36:11,093 INFO L87 Difference]: Start difference. First operand 117 states and 201 transitions. Second operand 17 states. [2020-07-20 13:36:11,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:11,456 INFO L93 Difference]: Finished difference Result 164 states and 328 transitions. [2020-07-20 13:36:11,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:36:11,457 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 436 [2020-07-20 13:36:11,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:11,461 INFO L225 Difference]: With dead ends: 164 [2020-07-20 13:36:11,462 INFO L226 Difference]: Without dead ends: 155 [2020-07-20 13:36:11,464 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 877 GetRequests, 843 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:36:11,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-07-20 13:36:11,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 129. [2020-07-20 13:36:11,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-07-20 13:36:11,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 240 transitions. [2020-07-20 13:36:11,483 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 240 transitions. Word has length 436 [2020-07-20 13:36:11,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:11,483 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 240 transitions. [2020-07-20 13:36:11,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:36:11,484 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 240 transitions. [2020-07-20 13:36:11,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 511 [2020-07-20 13:36:11,490 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:11,490 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 34, 34, 27, 26, 20, 20, 20, 20, 20, 20, 20, 17, 17, 17, 17, 17, 17, 17, 14, 10, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:11,704 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:11,705 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:11,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:11,706 INFO L82 PathProgramCache]: Analyzing trace with hash 1440475136, now seen corresponding path program 9 times [2020-07-20 13:36:11,707 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:11,707 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [545588472] [2020-07-20 13:36:11,708 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 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:12,191 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:12,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:12,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 927 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:36:12,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:12,452 INFO L134 CoverageAnalysis]: Checked inductivity of 7504 backedges. 328 proven. 944 refuted. 0 times theorem prover too weak. 6232 trivial. 0 not checked. [2020-07-20 13:36:12,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:15,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:15,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:16,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:16,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:16,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:16,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:16,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:16,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:16,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:17,122 INFO L134 CoverageAnalysis]: Checked inductivity of 7504 backedges. 330 proven. 963 refuted. 0 times theorem prover too weak. 6211 trivial. 0 not checked. [2020-07-20 13:36:17,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [545588472] [2020-07-20 13:36:17,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:17,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:36:17,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634913105] [2020-07-20 13:36:17,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:36:17,125 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:17,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:36:17,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:36:17,126 INFO L87 Difference]: Start difference. First operand 129 states and 240 transitions. Second operand 19 states. [2020-07-20 13:36:17,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:17,584 INFO L93 Difference]: Finished difference Result 172 states and 344 transitions. [2020-07-20 13:36:17,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:36:17,585 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 510 [2020-07-20 13:36:17,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:17,589 INFO L225 Difference]: With dead ends: 172 [2020-07-20 13:36:17,589 INFO L226 Difference]: Without dead ends: 163 [2020-07-20 13:36:17,591 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1026 GetRequests, 987 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:36:17,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-20 13:36:17,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 125. [2020-07-20 13:36:17,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-07-20 13:36:17,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 225 transitions. [2020-07-20 13:36:17,607 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 225 transitions. Word has length 510 [2020-07-20 13:36:17,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:17,608 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 225 transitions. [2020-07-20 13:36:17,608 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:36:17,608 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 225 transitions. [2020-07-20 13:36:17,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 491 [2020-07-20 13:36:17,622 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:17,622 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 34, 34, 31, 26, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 14, 8, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:17,835 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:17,836 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:17,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:17,837 INFO L82 PathProgramCache]: Analyzing trace with hash -706265930, now seen corresponding path program 10 times [2020-07-20 13:36:17,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:17,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557798081] [2020-07-20 13:36:17,838 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 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:18,281 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:18,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:18,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 890 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:36:18,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:18,600 INFO L134 CoverageAnalysis]: Checked inductivity of 6854 backedges. 288 proven. 747 refuted. 0 times theorem prover too weak. 5819 trivial. 0 not checked. [2020-07-20 13:36:18,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:20,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:20,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:21,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:21,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:21,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:21,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:21,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:21,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:21,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:21,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:21,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:22,247 INFO L134 CoverageAnalysis]: Checked inductivity of 6854 backedges. 288 proven. 763 refuted. 0 times theorem prover too weak. 5803 trivial. 0 not checked. [2020-07-20 13:36:22,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557798081] [2020-07-20 13:36:22,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:22,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:36:22,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606263024] [2020-07-20 13:36:22,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:36:22,249 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:22,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:36:22,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:36:22,249 INFO L87 Difference]: Start difference. First operand 125 states and 225 transitions. Second operand 17 states. [2020-07-20 13:36:22,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:22,637 INFO L93 Difference]: Finished difference Result 184 states and 375 transitions. [2020-07-20 13:36:22,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:36:22,638 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 490 [2020-07-20 13:36:22,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:22,641 INFO L225 Difference]: With dead ends: 184 [2020-07-20 13:36:22,641 INFO L226 Difference]: Without dead ends: 175 [2020-07-20 13:36:22,643 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 985 GetRequests, 951 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:36:22,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2020-07-20 13:36:22,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 122. [2020-07-20 13:36:22,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2020-07-20 13:36:22,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 215 transitions. [2020-07-20 13:36:22,661 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 215 transitions. Word has length 490 [2020-07-20 13:36:22,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:22,661 INFO L479 AbstractCegarLoop]: Abstraction has 122 states and 215 transitions. [2020-07-20 13:36:22,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:36:22,662 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 215 transitions. [2020-07-20 13:36:22,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 449 [2020-07-20 13:36:22,669 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:22,670 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 26, 25, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 10, 9, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:22,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:22,884 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:22,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:22,885 INFO L82 PathProgramCache]: Analyzing trace with hash 717621317, now seen corresponding path program 11 times [2020-07-20 13:36:22,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:22,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1496419872] [2020-07-20 13:36:22,886 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 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:23,325 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:23,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:23,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 812 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:36:23,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:23,641 INFO L134 CoverageAnalysis]: Checked inductivity of 5681 backedges. 273 proven. 529 refuted. 0 times theorem prover too weak. 4879 trivial. 0 not checked. [2020-07-20 13:36:23,641 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:25,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:25,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:25,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:25,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:26,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:26,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:26,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:26,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:26,406 INFO L134 CoverageAnalysis]: Checked inductivity of 5681 backedges. 273 proven. 539 refuted. 0 times theorem prover too weak. 4869 trivial. 0 not checked. [2020-07-20 13:36:26,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1496419872] [2020-07-20 13:36:26,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:26,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:36:26,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462673706] [2020-07-20 13:36:26,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:36:26,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:26,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:36:26,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:36:26,409 INFO L87 Difference]: Start difference. First operand 122 states and 215 transitions. Second operand 15 states. [2020-07-20 13:36:26,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:26,728 INFO L93 Difference]: Finished difference Result 212 states and 505 transitions. [2020-07-20 13:36:26,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:36:26,730 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 448 [2020-07-20 13:36:26,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:26,734 INFO L225 Difference]: With dead ends: 212 [2020-07-20 13:36:26,734 INFO L226 Difference]: Without dead ends: 203 [2020-07-20 13:36:26,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 900 GetRequests, 871 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:36:26,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2020-07-20 13:36:26,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 124. [2020-07-20 13:36:26,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-20 13:36:26,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 224 transitions. [2020-07-20 13:36:26,761 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 224 transitions. Word has length 448 [2020-07-20 13:36:26,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:26,762 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 224 transitions. [2020-07-20 13:36:26,762 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:36:26,762 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 224 transitions. [2020-07-20 13:36:26,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2020-07-20 13:36:26,768 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:26,768 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 25, 23, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 10, 9, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:26,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:26,983 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:26,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:26,984 INFO L82 PathProgramCache]: Analyzing trace with hash 1993486580, now seen corresponding path program 12 times [2020-07-20 13:36:26,984 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:26,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2038223574] [2020-07-20 13:36:26,985 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 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:27,509 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:36:27,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:27,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 909 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:36:27,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:27,743 INFO L134 CoverageAnalysis]: Checked inductivity of 4701 backedges. 400 proven. 467 refuted. 0 times theorem prover too weak. 3834 trivial. 0 not checked. [2020-07-20 13:36:27,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:29,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:29,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:29,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:30,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:30,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:30,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:30,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:31,135 INFO L134 CoverageAnalysis]: Checked inductivity of 4701 backedges. 402 proven. 481 refuted. 0 times theorem prover too weak. 3818 trivial. 0 not checked. [2020-07-20 13:36:31,135 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2038223574] [2020-07-20 13:36:31,135 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:31,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:36:31,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696685086] [2020-07-20 13:36:31,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:36:31,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:31,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:36:31,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:36:31,137 INFO L87 Difference]: Start difference. First operand 124 states and 224 transitions. Second operand 17 states. [2020-07-20 13:36:31,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:31,527 INFO L93 Difference]: Finished difference Result 176 states and 378 transitions. [2020-07-20 13:36:31,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:36:31,529 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 409 [2020-07-20 13:36:31,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:31,532 INFO L225 Difference]: With dead ends: 176 [2020-07-20 13:36:31,532 INFO L226 Difference]: Without dead ends: 167 [2020-07-20 13:36:31,534 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 789 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:36:31,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2020-07-20 13:36:31,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 144. [2020-07-20 13:36:31,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 13:36:31,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 288 transitions. [2020-07-20 13:36:31,554 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 288 transitions. Word has length 409 [2020-07-20 13:36:31,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:31,555 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 288 transitions. [2020-07-20 13:36:31,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:36:31,555 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 288 transitions. [2020-07-20 13:36:31,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 489 [2020-07-20 13:36:31,562 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:31,562 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 34, 34, 28, 27, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 10, 10, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:31,775 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:31,776 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:31,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:31,777 INFO L82 PathProgramCache]: Analyzing trace with hash 84357274, now seen corresponding path program 13 times [2020-07-20 13:36:31,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:31,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [796397983] [2020-07-20 13:36:31,778 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 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:32,272 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:32,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:32,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 884 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:36:32,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:32,721 INFO L134 CoverageAnalysis]: Checked inductivity of 6793 backedges. 639 proven. 744 refuted. 0 times theorem prover too weak. 5410 trivial. 0 not checked. [2020-07-20 13:36:32,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:36,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:37,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:37,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:37,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:38,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:38,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:38,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:38,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:38,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:39,087 INFO L134 CoverageAnalysis]: Checked inductivity of 6793 backedges. 639 proven. 777 refuted. 0 times theorem prover too weak. 5377 trivial. 0 not checked. [2020-07-20 13:36:39,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [796397983] [2020-07-20 13:36:39,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:39,088 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:36:39,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464904378] [2020-07-20 13:36:39,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:36:39,089 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:39,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:36:39,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:36:39,089 INFO L87 Difference]: Start difference. First operand 144 states and 288 transitions. Second operand 21 states. [2020-07-20 13:36:39,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:39,878 INFO L93 Difference]: Finished difference Result 178 states and 356 transitions. [2020-07-20 13:36:39,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:36:39,880 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 488 [2020-07-20 13:36:39,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:39,883 INFO L225 Difference]: With dead ends: 178 [2020-07-20 13:36:39,883 INFO L226 Difference]: Without dead ends: 160 [2020-07-20 13:36:39,885 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 983 GetRequests, 939 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:36:39,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-07-20 13:36:39,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 152. [2020-07-20 13:36:39,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2020-07-20 13:36:39,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 300 transitions. [2020-07-20 13:36:39,904 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 300 transitions. Word has length 488 [2020-07-20 13:36:39,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:39,905 INFO L479 AbstractCegarLoop]: Abstraction has 152 states and 300 transitions. [2020-07-20 13:36:39,905 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:36:39,905 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 300 transitions. [2020-07-20 13:36:39,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 409 [2020-07-20 13:36:39,912 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:39,913 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 26, 26, 24, 23, 16, 16, 16, 16, 16, 16, 16, 13, 13, 13, 13, 13, 13, 13, 11, 9, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:40,127 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:40,128 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:40,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:40,129 INFO L82 PathProgramCache]: Analyzing trace with hash 1213775026, now seen corresponding path program 14 times [2020-07-20 13:36:40,129 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:40,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1321522341] [2020-07-20 13:36:40,130 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 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:40,606 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:40,607 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:40,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 739 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:36:40,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:40,803 INFO L134 CoverageAnalysis]: Checked inductivity of 4733 backedges. 402 proven. 605 refuted. 0 times theorem prover too weak. 3726 trivial. 0 not checked. [2020-07-20 13:36:40,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:43,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:44,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:44,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:44,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:44,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:44,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:44,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:44,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:45,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:45,363 INFO L134 CoverageAnalysis]: Checked inductivity of 4733 backedges. 406 proven. 625 refuted. 0 times theorem prover too weak. 3702 trivial. 0 not checked. [2020-07-20 13:36:45,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1321522341] [2020-07-20 13:36:45,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:45,363 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:36:45,364 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440785438] [2020-07-20 13:36:45,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:36:45,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:45,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:36:45,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:36:45,365 INFO L87 Difference]: Start difference. First operand 152 states and 300 transitions. Second operand 19 states. [2020-07-20 13:36:45,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:45,952 INFO L93 Difference]: Finished difference Result 218 states and 466 transitions. [2020-07-20 13:36:45,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:36:45,954 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 408 [2020-07-20 13:36:45,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:45,957 INFO L225 Difference]: With dead ends: 218 [2020-07-20 13:36:45,958 INFO L226 Difference]: Without dead ends: 184 [2020-07-20 13:36:45,960 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 822 GetRequests, 783 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:36:45,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-07-20 13:36:45,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 175. [2020-07-20 13:36:45,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2020-07-20 13:36:45,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 362 transitions. [2020-07-20 13:36:45,983 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 362 transitions. Word has length 408 [2020-07-20 13:36:45,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:45,983 INFO L479 AbstractCegarLoop]: Abstraction has 175 states and 362 transitions. [2020-07-20 13:36:45,983 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:36:45,984 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 362 transitions. [2020-07-20 13:36:45,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 379 [2020-07-20 13:36:45,990 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:45,991 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 24, 24, 21, 20, 15, 15, 15, 15, 15, 15, 15, 12, 12, 12, 12, 12, 12, 12, 10, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:46,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:46,206 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:46,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:46,206 INFO L82 PathProgramCache]: Analyzing trace with hash 1441137870, now seen corresponding path program 15 times [2020-07-20 13:36:46,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:46,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [843010016] [2020-07-20 13:36:46,207 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 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:46,687 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:46,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:46,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 688 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 13:36:46,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:46,912 INFO L134 CoverageAnalysis]: Checked inductivity of 4048 backedges. 351 proven. 481 refuted. 0 times theorem prover too weak. 3216 trivial. 0 not checked. [2020-07-20 13:36:46,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:49,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:49,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:50,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:50,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:50,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:50,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:50,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:50,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:50,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:51,047 INFO L134 CoverageAnalysis]: Checked inductivity of 4048 backedges. 353 proven. 493 refuted. 0 times theorem prover too weak. 3202 trivial. 0 not checked. [2020-07-20 13:36:51,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [843010016] [2020-07-20 13:36:51,048 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:51,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-20 13:36:51,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375182783] [2020-07-20 13:36:51,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:36:51,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:51,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:36:51,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:36:51,049 INFO L87 Difference]: Start difference. First operand 175 states and 362 transitions. Second operand 19 states. [2020-07-20 13:36:51,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:51,601 INFO L93 Difference]: Finished difference Result 233 states and 489 transitions. [2020-07-20 13:36:51,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:36:51,603 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 378 [2020-07-20 13:36:51,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:51,608 INFO L225 Difference]: With dead ends: 233 [2020-07-20 13:36:51,608 INFO L226 Difference]: Without dead ends: 199 [2020-07-20 13:36:51,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 761 GetRequests, 725 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:36:51,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2020-07-20 13:36:51,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 164. [2020-07-20 13:36:51,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2020-07-20 13:36:51,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 320 transitions. [2020-07-20 13:36:51,653 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 320 transitions. Word has length 378 [2020-07-20 13:36:51,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:51,653 INFO L479 AbstractCegarLoop]: Abstraction has 164 states and 320 transitions. [2020-07-20 13:36:51,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:36:51,653 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 320 transitions. [2020-07-20 13:36:51,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 444 [2020-07-20 13:36:51,659 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:51,660 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 23, 23, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 10, 9, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:51,873 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:51,874 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:51,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:51,875 INFO L82 PathProgramCache]: Analyzing trace with hash -645349061, now seen corresponding path program 16 times [2020-07-20 13:36:51,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:51,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849509688] [2020-07-20 13:36:51,876 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 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:52,579 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:52,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:52,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 805 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:36:52,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:52,922 INFO L134 CoverageAnalysis]: Checked inductivity of 5562 backedges. 305 proven. 620 refuted. 0 times theorem prover too weak. 4637 trivial. 0 not checked. [2020-07-20 13:36:52,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:55,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:56,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:56,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:56,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:56,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:56,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:56,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:56,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:56,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:57,060 INFO L134 CoverageAnalysis]: Checked inductivity of 5562 backedges. 307 proven. 632 refuted. 0 times theorem prover too weak. 4623 trivial. 0 not checked. [2020-07-20 13:36:57,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849509688] [2020-07-20 13:36:57,063 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:57,063 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:36:57,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561373999] [2020-07-20 13:36:57,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:36:57,065 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:57,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:36:57,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:36:57,065 INFO L87 Difference]: Start difference. First operand 164 states and 320 transitions. Second operand 17 states. [2020-07-20 13:36:57,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:57,552 INFO L93 Difference]: Finished difference Result 219 states and 457 transitions. [2020-07-20 13:36:57,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:36:57,554 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 443 [2020-07-20 13:36:57,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:57,558 INFO L225 Difference]: With dead ends: 219 [2020-07-20 13:36:57,558 INFO L226 Difference]: Without dead ends: 210 [2020-07-20 13:36:57,561 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 891 GetRequests, 857 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:36:57,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2020-07-20 13:36:57,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 162. [2020-07-20 13:36:57,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-07-20 13:36:57,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 310 transitions. [2020-07-20 13:36:57,586 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 310 transitions. Word has length 443 [2020-07-20 13:36:57,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:57,587 INFO L479 AbstractCegarLoop]: Abstraction has 162 states and 310 transitions. [2020-07-20 13:36:57,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:36:57,587 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 310 transitions. [2020-07-20 13:36:57,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 380 [2020-07-20 13:36:57,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:57,592 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 26, 26, 21, 21, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 8, 8, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:57,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:57,806 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:57,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:57,807 INFO L82 PathProgramCache]: Analyzing trace with hash -1511480280, now seen corresponding path program 17 times [2020-07-20 13:36:57,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:57,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1115261782] [2020-07-20 13:36:57,808 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 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:58,375 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:36:58,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:58,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 843 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:36:58,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:58,626 INFO L134 CoverageAnalysis]: Checked inductivity of 4020 backedges. 463 proven. 440 refuted. 0 times theorem prover too weak. 3117 trivial. 0 not checked. [2020-07-20 13:36:58,627 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:01,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:01,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:01,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:01,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:02,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:02,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:02,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:02,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:02,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:02,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:02,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:03,462 INFO L134 CoverageAnalysis]: Checked inductivity of 4020 backedges. 467 proven. 457 refuted. 0 times theorem prover too weak. 3096 trivial. 0 not checked. [2020-07-20 13:37:03,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1115261782] [2020-07-20 13:37:03,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:03,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:37:03,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963355917] [2020-07-20 13:37:03,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:37:03,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:03,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:37:03,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:37:03,465 INFO L87 Difference]: Start difference. First operand 162 states and 310 transitions. Second operand 19 states. [2020-07-20 13:37:04,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:04,143 INFO L93 Difference]: Finished difference Result 221 states and 458 transitions. [2020-07-20 13:37:04,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:37:04,144 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 379 [2020-07-20 13:37:04,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:04,148 INFO L225 Difference]: With dead ends: 221 [2020-07-20 13:37:04,149 INFO L226 Difference]: Without dead ends: 212 [2020-07-20 13:37:04,151 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 725 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:37:04,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2020-07-20 13:37:04,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 162. [2020-07-20 13:37:04,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-07-20 13:37:04,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 310 transitions. [2020-07-20 13:37:04,175 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 310 transitions. Word has length 379 [2020-07-20 13:37:04,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:04,176 INFO L479 AbstractCegarLoop]: Abstraction has 162 states and 310 transitions. [2020-07-20 13:37:04,176 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:37:04,176 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 310 transitions. [2020-07-20 13:37:04,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 409 [2020-07-20 13:37:04,181 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:04,182 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 24, 23, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 9, 9, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:04,394 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:04,395 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:04,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:04,396 INFO L82 PathProgramCache]: Analyzing trace with hash 943685468, now seen corresponding path program 18 times [2020-07-20 13:37:04,396 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:04,396 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1470149722] [2020-07-20 13:37:04,396 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 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:04,968 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:37:04,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:04,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 907 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:37:04,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:05,170 INFO L134 CoverageAnalysis]: Checked inductivity of 4677 backedges. 405 proven. 441 refuted. 0 times theorem prover too weak. 3831 trivial. 0 not checked. [2020-07-20 13:37:05,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:07,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:07,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:08,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:08,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:08,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:08,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:08,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:08,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:09,297 INFO L134 CoverageAnalysis]: Checked inductivity of 4677 backedges. 407 proven. 453 refuted. 0 times theorem prover too weak. 3817 trivial. 0 not checked. [2020-07-20 13:37:09,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1470149722] [2020-07-20 13:37:09,297 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:09,298 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:37:09,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197009705] [2020-07-20 13:37:09,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:37:09,299 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:09,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:37:09,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:37:09,299 INFO L87 Difference]: Start difference. First operand 162 states and 310 transitions. Second operand 17 states. [2020-07-20 13:37:09,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:09,809 INFO L93 Difference]: Finished difference Result 251 states and 555 transitions. [2020-07-20 13:37:09,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:37:09,811 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 408 [2020-07-20 13:37:09,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:09,819 INFO L225 Difference]: With dead ends: 251 [2020-07-20 13:37:09,819 INFO L226 Difference]: Without dead ends: 242 [2020-07-20 13:37:09,823 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 821 GetRequests, 787 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:37:09,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2020-07-20 13:37:09,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 157. [2020-07-20 13:37:09,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-20 13:37:09,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 291 transitions. [2020-07-20 13:37:09,848 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 291 transitions. Word has length 408 [2020-07-20 13:37:09,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:09,848 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 291 transitions. [2020-07-20 13:37:09,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:37:09,849 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 291 transitions. [2020-07-20 13:37:09,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 435 [2020-07-20 13:37:09,854 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:09,855 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 25, 24, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 10, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:10,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:10,069 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:10,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:10,070 INFO L82 PathProgramCache]: Analyzing trace with hash -237304492, now seen corresponding path program 19 times [2020-07-20 13:37:10,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:10,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [309289724] [2020-07-20 13:37:10,071 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 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:10,648 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:37:10,649 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:10,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 965 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:37:10,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:10,812 INFO L134 CoverageAnalysis]: Checked inductivity of 5320 backedges. 364 proven. 405 refuted. 0 times theorem prover too weak. 4551 trivial. 0 not checked. [2020-07-20 13:37:10,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:12,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:12,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:13,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:13,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:13,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:13,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:13,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:13,361 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:13,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:14,143 INFO L134 CoverageAnalysis]: Checked inductivity of 5320 backedges. 364 proven. 417 refuted. 0 times theorem prover too weak. 4539 trivial. 0 not checked. [2020-07-20 13:37:14,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [309289724] [2020-07-20 13:37:14,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:14,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:37:14,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751258668] [2020-07-20 13:37:14,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:37:14,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:14,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:37:14,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:37:14,149 INFO L87 Difference]: Start difference. First operand 157 states and 291 transitions. Second operand 15 states. [2020-07-20 13:37:14,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:14,567 INFO L93 Difference]: Finished difference Result 288 states and 702 transitions. [2020-07-20 13:37:14,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:37:14,569 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 434 [2020-07-20 13:37:14,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:14,576 INFO L225 Difference]: With dead ends: 288 [2020-07-20 13:37:14,576 INFO L226 Difference]: Without dead ends: 279 [2020-07-20 13:37:14,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 872 GetRequests, 843 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:37:14,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2020-07-20 13:37:14,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 159. [2020-07-20 13:37:14,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2020-07-20 13:37:14,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 300 transitions. [2020-07-20 13:37:14,609 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 300 transitions. Word has length 434 [2020-07-20 13:37:14,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:14,610 INFO L479 AbstractCegarLoop]: Abstraction has 159 states and 300 transitions. [2020-07-20 13:37:14,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:37:14,610 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 300 transitions. [2020-07-20 13:37:14,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 435 [2020-07-20 13:37:14,616 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:14,616 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 25, 24, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 9, 9, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:14,829 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:14,830 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:14,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:14,831 INFO L82 PathProgramCache]: Analyzing trace with hash 1266926914, now seen corresponding path program 20 times [2020-07-20 13:37:14,831 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:14,832 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839658419] [2020-07-20 13:37:14,832 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 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:15,417 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:37:15,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:15,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 965 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:37:15,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:15,627 INFO L134 CoverageAnalysis]: Checked inductivity of 5320 backedges. 430 proven. 475 refuted. 0 times theorem prover too weak. 4415 trivial. 0 not checked. [2020-07-20 13:37:15,627 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:17,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:18,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:18,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:18,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:18,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:18,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:19,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:19,800 INFO L134 CoverageAnalysis]: Checked inductivity of 5320 backedges. 430 proven. 491 refuted. 0 times theorem prover too weak. 4399 trivial. 0 not checked. [2020-07-20 13:37:19,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839658419] [2020-07-20 13:37:19,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:19,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:37:19,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519993611] [2020-07-20 13:37:19,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:37:19,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:19,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:37:19,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:37:19,804 INFO L87 Difference]: Start difference. First operand 159 states and 300 transitions. Second operand 17 states. [2020-07-20 13:37:20,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:20,323 INFO L93 Difference]: Finished difference Result 225 states and 462 transitions. [2020-07-20 13:37:20,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:37:20,325 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 434 [2020-07-20 13:37:20,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:20,330 INFO L225 Difference]: With dead ends: 225 [2020-07-20 13:37:20,330 INFO L226 Difference]: Without dead ends: 216 [2020-07-20 13:37:20,333 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 873 GetRequests, 839 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:37:20,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-07-20 13:37:20,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 154. [2020-07-20 13:37:20,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2020-07-20 13:37:20,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 282 transitions. [2020-07-20 13:37:20,355 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 282 transitions. Word has length 434 [2020-07-20 13:37:20,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:20,356 INFO L479 AbstractCegarLoop]: Abstraction has 154 states and 282 transitions. [2020-07-20 13:37:20,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:37:20,356 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 282 transitions. [2020-07-20 13:37:20,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2020-07-20 13:37:20,362 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:20,362 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 28, 28, 23, 22, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 9, 8, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:20,576 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:20,577 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:20,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:20,578 INFO L82 PathProgramCache]: Analyzing trace with hash 245472924, now seen corresponding path program 21 times [2020-07-20 13:37:20,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:20,579 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1894588952] [2020-07-20 13:37:20,579 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 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:21,310 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:37:21,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:21,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 903 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:37:21,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:21,534 INFO L134 CoverageAnalysis]: Checked inductivity of 4640 backedges. 489 proven. 347 refuted. 0 times theorem prover too weak. 3804 trivial. 0 not checked. [2020-07-20 13:37:21,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:23,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:23,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:24,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:24,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:24,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:24,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:24,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:24,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:25,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:25,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:26,101 INFO L134 CoverageAnalysis]: Checked inductivity of 4640 backedges. 493 proven. 357 refuted. 0 times theorem prover too weak. 3790 trivial. 0 not checked. [2020-07-20 13:37:26,101 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1894588952] [2020-07-20 13:37:26,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:26,102 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:37:26,102 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634195633] [2020-07-20 13:37:26,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:37:26,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:26,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:37:26,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:37:26,104 INFO L87 Difference]: Start difference. First operand 154 states and 282 transitions. Second operand 17 states. [2020-07-20 13:37:26,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:26,637 INFO L93 Difference]: Finished difference Result 193 states and 363 transitions. [2020-07-20 13:37:26,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:37:26,638 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 406 [2020-07-20 13:37:26,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:26,642 INFO L225 Difference]: With dead ends: 193 [2020-07-20 13:37:26,642 INFO L226 Difference]: Without dead ends: 184 [2020-07-20 13:37:26,645 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 817 GetRequests, 783 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:37:26,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-07-20 13:37:26,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 154. [2020-07-20 13:37:26,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2020-07-20 13:37:26,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 285 transitions. [2020-07-20 13:37:26,665 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 285 transitions. Word has length 406 [2020-07-20 13:37:26,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:26,666 INFO L479 AbstractCegarLoop]: Abstraction has 154 states and 285 transitions. [2020-07-20 13:37:26,666 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:37:26,666 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 285 transitions. [2020-07-20 13:37:26,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 546 [2020-07-20 13:37:26,673 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:26,673 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 39, 33, 31, 20, 20, 20, 20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 19, 14, 11, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:26,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:26,889 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:26,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:26,890 INFO L82 PathProgramCache]: Analyzing trace with hash 1633910566, now seen corresponding path program 22 times [2020-07-20 13:37:26,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:26,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1834058829] [2020-07-20 13:37:26,891 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 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:27,509 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:37:27,509 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:27,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 989 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:37:27,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:27,840 INFO L134 CoverageAnalysis]: Checked inductivity of 8521 backedges. 491 proven. 702 refuted. 0 times theorem prover too weak. 7328 trivial. 0 not checked. [2020-07-20 13:37:27,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:31,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:31,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:31,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:31,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:32,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:32,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:32,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:32,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:32,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:32,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:32,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:32,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:33,260 INFO L134 CoverageAnalysis]: Checked inductivity of 8521 backedges. 495 proven. 716 refuted. 0 times theorem prover too weak. 7310 trivial. 0 not checked. [2020-07-20 13:37:33,260 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1834058829] [2020-07-20 13:37:33,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:33,261 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:37:33,261 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126198938] [2020-07-20 13:37:33,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:37:33,262 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:33,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:37:33,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:37:33,262 INFO L87 Difference]: Start difference. First operand 154 states and 285 transitions. Second operand 17 states. [2020-07-20 13:37:33,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:33,839 INFO L93 Difference]: Finished difference Result 230 states and 461 transitions. [2020-07-20 13:37:33,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:37:33,842 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 545 [2020-07-20 13:37:33,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:33,845 INFO L225 Difference]: With dead ends: 230 [2020-07-20 13:37:33,846 INFO L226 Difference]: Without dead ends: 212 [2020-07-20 13:37:33,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1095 GetRequests, 1061 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:37:33,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2020-07-20 13:37:33,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 157. [2020-07-20 13:37:33,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-20 13:37:33,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 295 transitions. [2020-07-20 13:37:33,868 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 295 transitions. Word has length 545 [2020-07-20 13:37:33,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:33,869 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 295 transitions. [2020-07-20 13:37:33,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:37:33,869 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 295 transitions. [2020-07-20 13:37:33,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-20 13:37:33,875 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:33,876 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 31, 31, 27, 25, 17, 17, 17, 17, 17, 17, 17, 15, 15, 15, 15, 15, 15, 15, 12, 8, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:34,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:34,091 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:34,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:34,092 INFO L82 PathProgramCache]: Analyzing trace with hash 1642442441, now seen corresponding path program 23 times [2020-07-20 13:37:34,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:34,093 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1797036617] [2020-07-20 13:37:34,094 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 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:34,778 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:37:34,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:34,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:37:34,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:35,039 INFO L134 CoverageAnalysis]: Checked inductivity of 5719 backedges. 628 proven. 479 refuted. 0 times theorem prover too weak. 4612 trivial. 0 not checked. [2020-07-20 13:37:35,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:38,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:38,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:38,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:38,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:39,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:39,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:39,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:39,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:39,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:39,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:39,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:39,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:40,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:40,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:41,026 INFO L134 CoverageAnalysis]: Checked inductivity of 5719 backedges. 630 proven. 501 refuted. 0 times theorem prover too weak. 4588 trivial. 0 not checked. [2020-07-20 13:37:41,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1797036617] [2020-07-20 13:37:41,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:41,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:37:41,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630506587] [2020-07-20 13:37:41,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:37:41,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:41,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:37:41,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:37:41,028 INFO L87 Difference]: Start difference. First operand 157 states and 295 transitions. Second operand 19 states. [2020-07-20 13:37:41,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:41,827 INFO L93 Difference]: Finished difference Result 223 states and 448 transitions. [2020-07-20 13:37:41,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:37:41,829 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 449 [2020-07-20 13:37:41,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:41,834 INFO L225 Difference]: With dead ends: 223 [2020-07-20 13:37:41,834 INFO L226 Difference]: Without dead ends: 205 [2020-07-20 13:37:41,836 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 904 GetRequests, 865 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:37:41,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2020-07-20 13:37:41,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 181. [2020-07-20 13:37:41,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2020-07-20 13:37:41,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 381 transitions. [2020-07-20 13:37:41,852 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 381 transitions. Word has length 449 [2020-07-20 13:37:41,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:41,853 INFO L479 AbstractCegarLoop]: Abstraction has 181 states and 381 transitions. [2020-07-20 13:37:41,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:37:41,853 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 381 transitions. [2020-07-20 13:37:41,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 473 [2020-07-20 13:37:41,858 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:41,858 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 26, 25, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 10, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:42,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:42,059 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:42,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:42,060 INFO L82 PathProgramCache]: Analyzing trace with hash 562714943, now seen corresponding path program 24 times [2020-07-20 13:37:42,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:42,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1246082669] [2020-07-20 13:37:42,061 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:42,713 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:37:42,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:42,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 1050 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:37:42,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:42,994 INFO L134 CoverageAnalysis]: Checked inductivity of 6337 backedges. 711 proven. 303 refuted. 0 times theorem prover too weak. 5323 trivial. 0 not checked. [2020-07-20 13:37:42,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:44,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:44,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:45,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:45,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:46,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:46,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:46,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:46,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:46,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:48,413 INFO L134 CoverageAnalysis]: Checked inductivity of 6337 backedges. 715 proven. 315 refuted. 0 times theorem prover too weak. 5307 trivial. 0 not checked. [2020-07-20 13:37:48,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1246082669] [2020-07-20 13:37:48,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:48,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:37:48,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30986229] [2020-07-20 13:37:48,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:37:48,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:48,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:37:48,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:37:48,415 INFO L87 Difference]: Start difference. First operand 181 states and 381 transitions. Second operand 17 states. [2020-07-20 13:37:49,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:49,016 INFO L93 Difference]: Finished difference Result 267 states and 660 transitions. [2020-07-20 13:37:49,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:37:49,018 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 472 [2020-07-20 13:37:49,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:49,024 INFO L225 Difference]: With dead ends: 267 [2020-07-20 13:37:49,024 INFO L226 Difference]: Without dead ends: 252 [2020-07-20 13:37:49,028 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 949 GetRequests, 915 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:37:49,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2020-07-20 13:37:49,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 218. [2020-07-20 13:37:49,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2020-07-20 13:37:49,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 500 transitions. [2020-07-20 13:37:49,066 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 500 transitions. Word has length 472 [2020-07-20 13:37:49,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:49,067 INFO L479 AbstractCegarLoop]: Abstraction has 218 states and 500 transitions. [2020-07-20 13:37:49,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:37:49,068 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 500 transitions. [2020-07-20 13:37:49,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-20 13:37:49,077 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:49,078 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 34, 34, 29, 27, 19, 19, 19, 19, 19, 19, 19, 17, 17, 17, 17, 17, 17, 17, 12, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:49,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:49,292 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:49,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:49,293 INFO L82 PathProgramCache]: Analyzing trace with hash -1669969245, now seen corresponding path program 25 times [2020-07-20 13:37:49,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:49,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1471162175] [2020-07-20 13:37:49,294 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 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:49,969 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:37:49,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:49,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 912 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 13:37:49,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:50,275 INFO L134 CoverageAnalysis]: Checked inductivity of 7193 backedges. 528 proven. 617 refuted. 0 times theorem prover too weak. 6048 trivial. 0 not checked. [2020-07-20 13:37:50,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:53,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:54,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:54,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:55,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:55,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:55,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:55,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:55,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:55,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:55,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:56,550 INFO L134 CoverageAnalysis]: Checked inductivity of 7193 backedges. 526 proven. 635 refuted. 0 times theorem prover too weak. 6032 trivial. 0 not checked. [2020-07-20 13:37:56,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1471162175] [2020-07-20 13:37:56,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:56,551 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-20 13:37:56,551 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698548551] [2020-07-20 13:37:56,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:37:56,551 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:56,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:37:56,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:37:56,552 INFO L87 Difference]: Start difference. First operand 218 states and 500 transitions. Second operand 19 states. [2020-07-20 13:37:57,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:57,354 INFO L93 Difference]: Finished difference Result 286 states and 717 transitions. [2020-07-20 13:37:57,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:37:57,356 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 501 [2020-07-20 13:37:57,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:57,362 INFO L225 Difference]: With dead ends: 286 [2020-07-20 13:37:57,362 INFO L226 Difference]: Without dead ends: 268 [2020-07-20 13:37:57,366 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1007 GetRequests, 971 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:37:57,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2020-07-20 13:37:57,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 200. [2020-07-20 13:37:57,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-20 13:37:57,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 458 transitions. [2020-07-20 13:37:57,396 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 458 transitions. Word has length 501 [2020-07-20 13:37:57,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:57,397 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 458 transitions. [2020-07-20 13:37:57,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:37:57,397 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 458 transitions. [2020-07-20 13:37:57,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 420 [2020-07-20 13:37:57,405 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:57,406 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 28, 28, 23, 23, 16, 16, 16, 16, 16, 16, 16, 14, 14, 14, 14, 14, 14, 14, 10, 9, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:57,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:57,608 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:57,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:57,609 INFO L82 PathProgramCache]: Analyzing trace with hash 1875820497, now seen corresponding path program 26 times [2020-07-20 13:37:57,609 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:57,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [593188740] [2020-07-20 13:37:57,610 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 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:58,286 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:37:58,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:58,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 932 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:37:58,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:58,620 INFO L134 CoverageAnalysis]: Checked inductivity of 4974 backedges. 795 proven. 222 refuted. 0 times theorem prover too weak. 3957 trivial. 0 not checked. [2020-07-20 13:37:58,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:01,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:02,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:02,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:02,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:03,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:03,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:03,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:03,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:03,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:03,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:05,225 INFO L134 CoverageAnalysis]: Checked inductivity of 4974 backedges. 799 proven. 239 refuted. 0 times theorem prover too weak. 3936 trivial. 0 not checked. [2020-07-20 13:38:05,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [593188740] [2020-07-20 13:38:05,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:05,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:38:05,227 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66963217] [2020-07-20 13:38:05,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:38:05,228 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:05,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:38:05,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:38:05,229 INFO L87 Difference]: Start difference. First operand 200 states and 458 transitions. Second operand 19 states. [2020-07-20 13:38:06,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:06,007 INFO L93 Difference]: Finished difference Result 261 states and 653 transitions. [2020-07-20 13:38:06,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:38:06,010 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 419 [2020-07-20 13:38:06,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:06,015 INFO L225 Difference]: With dead ends: 261 [2020-07-20 13:38:06,015 INFO L226 Difference]: Without dead ends: 246 [2020-07-20 13:38:06,019 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 844 GetRequests, 805 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:38:06,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2020-07-20 13:38:06,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 202. [2020-07-20 13:38:06,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2020-07-20 13:38:06,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 446 transitions. [2020-07-20 13:38:06,040 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 446 transitions. Word has length 419 [2020-07-20 13:38:06,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:06,041 INFO L479 AbstractCegarLoop]: Abstraction has 202 states and 446 transitions. [2020-07-20 13:38:06,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:38:06,041 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 446 transitions. [2020-07-20 13:38:06,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2020-07-20 13:38:06,049 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:06,049 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 25, 25, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 9, 9, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:06,249 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:06,250 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:06,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:06,251 INFO L82 PathProgramCache]: Analyzing trace with hash -1971272881, now seen corresponding path program 27 times [2020-07-20 13:38:06,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:06,252 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1324327425] [2020-07-20 13:38:06,252 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 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:06,957 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:06,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:06,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 994 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:38:06,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:07,364 INFO L134 CoverageAnalysis]: Checked inductivity of 5656 backedges. 674 proven. 259 refuted. 0 times theorem prover too weak. 4723 trivial. 0 not checked. [2020-07-20 13:38:07,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:09,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:10,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:10,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:10,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:11,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:11,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:11,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:11,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:11,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:12,714 INFO L134 CoverageAnalysis]: Checked inductivity of 5656 backedges. 676 proven. 273 refuted. 0 times theorem prover too weak. 4707 trivial. 0 not checked. [2020-07-20 13:38:12,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1324327425] [2020-07-20 13:38:12,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:12,715 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:38:12,715 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948726552] [2020-07-20 13:38:12,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:38:12,716 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:12,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:38:12,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:38:12,717 INFO L87 Difference]: Start difference. First operand 202 states and 446 transitions. Second operand 17 states. [2020-07-20 13:38:13,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:13,031 INFO L93 Difference]: Finished difference Result 316 states and 825 transitions. [2020-07-20 13:38:13,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:38:13,032 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 447 [2020-07-20 13:38:13,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:13,036 INFO L225 Difference]: With dead ends: 316 [2020-07-20 13:38:13,037 INFO L226 Difference]: Without dead ends: 301 [2020-07-20 13:38:13,040 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 899 GetRequests, 865 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:38:13,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2020-07-20 13:38:13,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 197. [2020-07-20 13:38:13,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-20 13:38:13,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 421 transitions. [2020-07-20 13:38:13,061 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 421 transitions. Word has length 447 [2020-07-20 13:38:13,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:13,061 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 421 transitions. [2020-07-20 13:38:13,062 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:38:13,062 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 421 transitions. [2020-07-20 13:38:13,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2020-07-20 13:38:13,067 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:13,068 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 26, 26, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 11, 10, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:13,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:13,276 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:13,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:13,277 INFO L82 PathProgramCache]: Analyzing trace with hash -732201348, now seen corresponding path program 28 times [2020-07-20 13:38:13,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:13,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [298593582] [2020-07-20 13:38:13,277 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 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:13,965 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:13,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:13,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 971 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:38:13,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:14,337 INFO L134 CoverageAnalysis]: Checked inductivity of 5394 backedges. 579 proven. 200 refuted. 0 times theorem prover too weak. 4615 trivial. 0 not checked. [2020-07-20 13:38:14,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:15,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:15,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:16,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:16,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:16,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:16,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:17,302 INFO L134 CoverageAnalysis]: Checked inductivity of 5394 backedges. 581 proven. 208 refuted. 0 times theorem prover too weak. 4605 trivial. 0 not checked. [2020-07-20 13:38:17,303 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [298593582] [2020-07-20 13:38:17,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:17,303 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:38:17,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050492533] [2020-07-20 13:38:17,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:38:17,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:17,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:38:17,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:38:17,304 INFO L87 Difference]: Start difference. First operand 197 states and 421 transitions. Second operand 15 states. [2020-07-20 13:38:17,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:17,650 INFO L93 Difference]: Finished difference Result 341 states and 962 transitions. [2020-07-20 13:38:17,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:38:17,652 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 437 [2020-07-20 13:38:17,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:17,658 INFO L225 Difference]: With dead ends: 341 [2020-07-20 13:38:17,658 INFO L226 Difference]: Without dead ends: 326 [2020-07-20 13:38:17,662 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 878 GetRequests, 849 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:38:17,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2020-07-20 13:38:17,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 199. [2020-07-20 13:38:17,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2020-07-20 13:38:17,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 434 transitions. [2020-07-20 13:38:17,688 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 434 transitions. Word has length 437 [2020-07-20 13:38:17,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:17,689 INFO L479 AbstractCegarLoop]: Abstraction has 199 states and 434 transitions. [2020-07-20 13:38:17,689 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:38:17,689 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 434 transitions. [2020-07-20 13:38:17,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 487 [2020-07-20 13:38:17,696 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:17,697 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 28, 25, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 11, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:17,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:17,910 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:17,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:17,910 INFO L82 PathProgramCache]: Analyzing trace with hash -1275729224, now seen corresponding path program 29 times [2020-07-20 13:38:17,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:17,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1747084200] [2020-07-20 13:38:17,911 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 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:18,597 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:18,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:18,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 1081 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:38:18,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:18,826 INFO L134 CoverageAnalysis]: Checked inductivity of 6734 backedges. 401 proven. 449 refuted. 0 times theorem prover too weak. 5884 trivial. 0 not checked. [2020-07-20 13:38:18,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:20,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:21,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:21,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:21,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:21,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:21,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:21,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:21,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:21,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:22,058 INFO L134 CoverageAnalysis]: Checked inductivity of 6734 backedges. 401 proven. 459 refuted. 0 times theorem prover too weak. 5874 trivial. 0 not checked. [2020-07-20 13:38:22,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1747084200] [2020-07-20 13:38:22,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:22,059 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:38:22,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789413465] [2020-07-20 13:38:22,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:38:22,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:22,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:38:22,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:38:22,060 INFO L87 Difference]: Start difference. First operand 199 states and 434 transitions. Second operand 15 states. [2020-07-20 13:38:22,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:22,368 INFO L93 Difference]: Finished difference Result 297 states and 718 transitions. [2020-07-20 13:38:22,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:38:22,370 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 486 [2020-07-20 13:38:22,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:22,375 INFO L225 Difference]: With dead ends: 297 [2020-07-20 13:38:22,375 INFO L226 Difference]: Without dead ends: 288 [2020-07-20 13:38:22,379 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 976 GetRequests, 947 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:38:22,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2020-07-20 13:38:22,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 196. [2020-07-20 13:38:22,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2020-07-20 13:38:22,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 424 transitions. [2020-07-20 13:38:22,399 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 424 transitions. Word has length 486 [2020-07-20 13:38:22,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:22,399 INFO L479 AbstractCegarLoop]: Abstraction has 196 states and 424 transitions. [2020-07-20 13:38:22,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:38:22,399 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 424 transitions. [2020-07-20 13:38:22,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 436 [2020-07-20 13:38:22,403 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:22,404 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 30, 30, 25, 25, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 10, 9, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:22,604 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:22,605 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:22,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:22,605 INFO L82 PathProgramCache]: Analyzing trace with hash -1239409556, now seen corresponding path program 30 times [2020-07-20 13:38:22,606 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:22,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [730918643] [2020-07-20 13:38:22,606 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 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:23,290 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:23,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:23,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 967 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:38:23,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:23,522 INFO L134 CoverageAnalysis]: Checked inductivity of 5352 backedges. 870 proven. 205 refuted. 0 times theorem prover too weak. 4277 trivial. 0 not checked. [2020-07-20 13:38:23,522 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:25,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:25,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:25,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:26,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:26,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:26,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:26,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:26,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:26,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:26,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:27,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:28,018 INFO L134 CoverageAnalysis]: Checked inductivity of 5352 backedges. 874 proven. 227 refuted. 0 times theorem prover too weak. 4251 trivial. 0 not checked. [2020-07-20 13:38:28,019 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [730918643] [2020-07-20 13:38:28,019 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:28,019 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 13:38:28,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136111048] [2020-07-20 13:38:28,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 13:38:28,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:28,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 13:38:28,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:38:28,021 INFO L87 Difference]: Start difference. First operand 196 states and 424 transitions. Second operand 20 states. [2020-07-20 13:38:28,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:28,586 INFO L93 Difference]: Finished difference Result 334 states and 837 transitions. [2020-07-20 13:38:28,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:38:28,588 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 435 [2020-07-20 13:38:28,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:28,594 INFO L225 Difference]: With dead ends: 334 [2020-07-20 13:38:28,594 INFO L226 Difference]: Without dead ends: 319 [2020-07-20 13:38:28,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 876 GetRequests, 837 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:38:28,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2020-07-20 13:38:28,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 246. [2020-07-20 13:38:28,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2020-07-20 13:38:28,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 577 transitions. [2020-07-20 13:38:28,628 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 577 transitions. Word has length 435 [2020-07-20 13:38:28,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:28,628 INFO L479 AbstractCegarLoop]: Abstraction has 246 states and 577 transitions. [2020-07-20 13:38:28,628 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 13:38:28,629 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 577 transitions. [2020-07-20 13:38:28,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 478 [2020-07-20 13:38:28,637 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:28,637 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 29, 27, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 12, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:28,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:28,852 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:28,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:28,853 INFO L82 PathProgramCache]: Analyzing trace with hash 1848862285, now seen corresponding path program 31 times [2020-07-20 13:38:28,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:28,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [50938454] [2020-07-20 13:38:28,853 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 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:29,536 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:38:29,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:29,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 867 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:38:29,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:29,791 INFO L134 CoverageAnalysis]: Checked inductivity of 6469 backedges. 292 proven. 901 refuted. 0 times theorem prover too weak. 5276 trivial. 0 not checked. [2020-07-20 13:38:29,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:32,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:32,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:33,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:33,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:33,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:33,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:33,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:33,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:34,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:34,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:34,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:34,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:34,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:34,408 INFO L134 CoverageAnalysis]: Checked inductivity of 6469 backedges. 296 proven. 923 refuted. 0 times theorem prover too weak. 5250 trivial. 0 not checked. [2020-07-20 13:38:34,408 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [50938454] [2020-07-20 13:38:34,409 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:34,409 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:38:34,409 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753193167] [2020-07-20 13:38:34,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:38:34,410 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:34,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:38:34,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:38:34,411 INFO L87 Difference]: Start difference. First operand 246 states and 577 transitions. Second operand 19 states. [2020-07-20 13:38:34,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:34,908 INFO L93 Difference]: Finished difference Result 317 states and 764 transitions. [2020-07-20 13:38:34,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:38:34,909 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 477 [2020-07-20 13:38:34,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:34,914 INFO L225 Difference]: With dead ends: 317 [2020-07-20 13:38:34,914 INFO L226 Difference]: Without dead ends: 251 [2020-07-20 13:38:34,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 960 GetRequests, 921 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:38:34,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2020-07-20 13:38:34,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 210. [2020-07-20 13:38:34,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2020-07-20 13:38:34,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 464 transitions. [2020-07-20 13:38:34,946 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 464 transitions. Word has length 477 [2020-07-20 13:38:34,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:34,947 INFO L479 AbstractCegarLoop]: Abstraction has 210 states and 464 transitions. [2020-07-20 13:38:34,947 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:38:34,947 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 464 transitions. [2020-07-20 13:38:34,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 436 [2020-07-20 13:38:34,957 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:34,957 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 30, 30, 25, 25, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 10, 9, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:35,170 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:35,171 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:35,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:35,172 INFO L82 PathProgramCache]: Analyzing trace with hash -492224958, now seen corresponding path program 32 times [2020-07-20 13:38:35,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:35,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1708959081] [2020-07-20 13:38:35,173 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 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:35,930 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:35,930 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:35,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 967 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:38:35,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:36,091 INFO L134 CoverageAnalysis]: Checked inductivity of 5352 backedges. 701 proven. 204 refuted. 0 times theorem prover too weak. 4447 trivial. 0 not checked. [2020-07-20 13:38:36,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:37,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:37,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:37,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:37,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:38,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:38,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:38,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:38,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:38,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:38,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:39,602 INFO L134 CoverageAnalysis]: Checked inductivity of 5352 backedges. 705 proven. 214 refuted. 0 times theorem prover too weak. 4433 trivial. 0 not checked. [2020-07-20 13:38:39,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1708959081] [2020-07-20 13:38:39,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:39,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:38:39,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114792932] [2020-07-20 13:38:39,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:38:39,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:39,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:38:39,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:38:39,604 INFO L87 Difference]: Start difference. First operand 210 states and 464 transitions. Second operand 17 states. [2020-07-20 13:38:39,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:39,987 INFO L93 Difference]: Finished difference Result 286 states and 676 transitions. [2020-07-20 13:38:39,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:38:39,988 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 435 [2020-07-20 13:38:39,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:39,993 INFO L225 Difference]: With dead ends: 286 [2020-07-20 13:38:39,993 INFO L226 Difference]: Without dead ends: 271 [2020-07-20 13:38:39,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 875 GetRequests, 841 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:38:39,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2020-07-20 13:38:40,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 203. [2020-07-20 13:38:40,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 203 states. [2020-07-20 13:38:40,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 430 transitions. [2020-07-20 13:38:40,014 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 430 transitions. Word has length 435 [2020-07-20 13:38:40,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:40,014 INFO L479 AbstractCegarLoop]: Abstraction has 203 states and 430 transitions. [2020-07-20 13:38:40,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:38:40,014 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 430 transitions. [2020-07-20 13:38:40,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 13:38:40,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:40,019 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 36, 29, 28, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 11, 10, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:40,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:40,222 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:40,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:40,223 INFO L82 PathProgramCache]: Analyzing trace with hash -1993192309, now seen corresponding path program 33 times [2020-07-20 13:38:40,223 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:40,224 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [958527440] [2020-07-20 13:38:40,224 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 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:41,029 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:38:41,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:41,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 912 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:38:41,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:41,241 INFO L134 CoverageAnalysis]: Checked inductivity of 7192 backedges. 254 proven. 1010 refuted. 0 times theorem prover too weak. 5928 trivial. 0 not checked. [2020-07-20 13:38:41,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:44,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:44,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:45,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:45,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:45,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:45,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:45,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:46,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:46,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:46,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:46,257 INFO L134 CoverageAnalysis]: Checked inductivity of 7192 backedges. 262 proven. 1026 refuted. 0 times theorem prover too weak. 5904 trivial. 0 not checked. [2020-07-20 13:38:46,258 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [958527440] [2020-07-20 13:38:46,258 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:46,258 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:38:46,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995953851] [2020-07-20 13:38:46,259 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:38:46,259 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:46,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:38:46,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:38:46,259 INFO L87 Difference]: Start difference. First operand 203 states and 430 transitions. Second operand 19 states. [2020-07-20 13:38:46,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:46,842 INFO L93 Difference]: Finished difference Result 409 states and 1010 transitions. [2020-07-20 13:38:46,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:38:46,843 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 502 [2020-07-20 13:38:46,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:46,848 INFO L225 Difference]: With dead ends: 409 [2020-07-20 13:38:46,848 INFO L226 Difference]: Without dead ends: 243 [2020-07-20 13:38:46,852 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1010 GetRequests, 971 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:38:46,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2020-07-20 13:38:46,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 200. [2020-07-20 13:38:46,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-20 13:38:46,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 411 transitions. [2020-07-20 13:38:46,867 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 411 transitions. Word has length 502 [2020-07-20 13:38:46,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:46,868 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 411 transitions. [2020-07-20 13:38:46,868 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:38:46,868 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 411 transitions. [2020-07-20 13:38:46,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 462 [2020-07-20 13:38:46,871 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:46,871 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 27, 25, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:47,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:47,072 INFO L427 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:47,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:47,074 INFO L82 PathProgramCache]: Analyzing trace with hash -1050352804, now seen corresponding path program 34 times [2020-07-20 13:38:47,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:47,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2112862240] [2020-07-20 13:38:47,075 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 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:47,882 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:47,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:47,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 1025 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:38:47,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:48,055 INFO L134 CoverageAnalysis]: Checked inductivity of 6031 backedges. 753 proven. 214 refuted. 0 times theorem prover too weak. 5064 trivial. 0 not checked. [2020-07-20 13:38:48,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:49,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:49,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:50,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:50,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:50,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:50,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:50,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:50,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:50,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:50,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:51,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:51,959 INFO L134 CoverageAnalysis]: Checked inductivity of 6031 backedges. 757 proven. 226 refuted. 0 times theorem prover too weak. 5048 trivial. 0 not checked. [2020-07-20 13:38:51,959 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2112862240] [2020-07-20 13:38:51,959 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:51,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:38:51,960 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832960453] [2020-07-20 13:38:51,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:38:51,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:51,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:38:51,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:38:51,961 INFO L87 Difference]: Start difference. First operand 200 states and 411 transitions. Second operand 17 states. [2020-07-20 13:38:52,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:52,327 INFO L93 Difference]: Finished difference Result 234 states and 483 transitions. [2020-07-20 13:38:52,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:38:52,329 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 461 [2020-07-20 13:38:52,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:52,333 INFO L225 Difference]: With dead ends: 234 [2020-07-20 13:38:52,333 INFO L226 Difference]: Without dead ends: 219 [2020-07-20 13:38:52,335 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 927 GetRequests, 893 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:38:52,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2020-07-20 13:38:52,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 195. [2020-07-20 13:38:52,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2020-07-20 13:38:52,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 391 transitions. [2020-07-20 13:38:52,356 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 391 transitions. Word has length 461 [2020-07-20 13:38:52,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:52,356 INFO L479 AbstractCegarLoop]: Abstraction has 195 states and 391 transitions. [2020-07-20 13:38:52,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:38:52,357 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 391 transitions. [2020-07-20 13:38:52,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 518 [2020-07-20 13:38:52,362 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:52,362 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 37, 32, 28, 19, 19, 19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 18, 18, 14, 9, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:52,576 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:52,577 INFO L427 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:52,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:52,578 INFO L82 PathProgramCache]: Analyzing trace with hash 213507056, now seen corresponding path program 35 times [2020-07-20 13:38:52,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:52,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [764909846] [2020-07-20 13:38:52,579 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 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:53,386 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:53,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:53,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 1149 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:38:53,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:53,585 INFO L134 CoverageAnalysis]: Checked inductivity of 7646 backedges. 766 proven. 359 refuted. 0 times theorem prover too weak. 6521 trivial. 0 not checked. [2020-07-20 13:38:53,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:55,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:55,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:56,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:56,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:56,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:56,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:56,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:56,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:56,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:56,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:57,946 INFO L134 CoverageAnalysis]: Checked inductivity of 7646 backedges. 770 proven. 373 refuted. 0 times theorem prover too weak. 6503 trivial. 0 not checked. [2020-07-20 13:38:57,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [764909846] [2020-07-20 13:38:57,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:57,947 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:38:57,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901313925] [2020-07-20 13:38:57,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:38:57,948 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:57,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:38:57,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:38:57,948 INFO L87 Difference]: Start difference. First operand 195 states and 391 transitions. Second operand 17 states. [2020-07-20 13:38:58,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:58,350 INFO L93 Difference]: Finished difference Result 269 states and 542 transitions. [2020-07-20 13:38:58,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:38:58,352 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 517 [2020-07-20 13:38:58,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:58,356 INFO L225 Difference]: With dead ends: 269 [2020-07-20 13:38:58,357 INFO L226 Difference]: Without dead ends: 254 [2020-07-20 13:38:58,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1039 GetRequests, 1005 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:38:58,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2020-07-20 13:38:58,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 221. [2020-07-20 13:38:58,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 221 states. [2020-07-20 13:38:58,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 454 transitions. [2020-07-20 13:38:58,376 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 454 transitions. Word has length 517 [2020-07-20 13:38:58,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:58,377 INFO L479 AbstractCegarLoop]: Abstraction has 221 states and 454 transitions. [2020-07-20 13:38:58,377 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:38:58,377 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 454 transitions. [2020-07-20 13:38:58,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-20 13:38:58,381 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:58,382 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 26, 26, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 10, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:58,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:58,595 INFO L427 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:58,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:58,596 INFO L82 PathProgramCache]: Analyzing trace with hash 901969959, now seen corresponding path program 36 times [2020-07-20 13:38:58,596 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:58,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698820753] [2020-07-20 13:38:58,596 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 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:59,430 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:59,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:59,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:38:59,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:59,651 INFO L134 CoverageAnalysis]: Checked inductivity of 5706 backedges. 875 proven. 239 refuted. 0 times theorem prover too weak. 4592 trivial. 0 not checked. [2020-07-20 13:38:59,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:01,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:01,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:02,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:02,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:03,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:03,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:03,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:03,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:03,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:03,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:03,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:04,932 INFO L134 CoverageAnalysis]: Checked inductivity of 5706 backedges. 877 proven. 261 refuted. 0 times theorem prover too weak. 4568 trivial. 0 not checked. [2020-07-20 13:39:04,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698820753] [2020-07-20 13:39:04,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:04,933 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:39:04,933 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072530204] [2020-07-20 13:39:04,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:39:04,933 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:04,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:39:04,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:39:04,934 INFO L87 Difference]: Start difference. First operand 221 states and 454 transitions. Second operand 19 states. [2020-07-20 13:39:05,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:39:05,476 INFO L93 Difference]: Finished difference Result 309 states and 627 transitions. [2020-07-20 13:39:05,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:39:05,477 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 449 [2020-07-20 13:39:05,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:39:05,482 INFO L225 Difference]: With dead ends: 309 [2020-07-20 13:39:05,482 INFO L226 Difference]: Without dead ends: 294 [2020-07-20 13:39:05,484 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 904 GetRequests, 865 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:39:05,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2020-07-20 13:39:05,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 218. [2020-07-20 13:39:05,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2020-07-20 13:39:05,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 439 transitions. [2020-07-20 13:39:05,507 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 439 transitions. Word has length 449 [2020-07-20 13:39:05,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:39:05,508 INFO L479 AbstractCegarLoop]: Abstraction has 218 states and 439 transitions. [2020-07-20 13:39:05,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:39:05,508 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 439 transitions. [2020-07-20 13:39:05,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 465 [2020-07-20 13:39:05,514 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:39:05,514 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 32, 32, 28, 27, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 12, 10, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:39:05,728 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:05,729 INFO L427 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:39:05,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:39:05,729 INFO L82 PathProgramCache]: Analyzing trace with hash 1270025490, now seen corresponding path program 37 times [2020-07-20 13:39:05,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:39:05,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1157361671] [2020-07-20 13:39:05,730 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 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:06,599 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:39:06,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:06,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 1031 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:39:06,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:06,835 INFO L134 CoverageAnalysis]: Checked inductivity of 6117 backedges. 931 proven. 228 refuted. 0 times theorem prover too weak. 4958 trivial. 0 not checked. [2020-07-20 13:39:06,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:09,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:09,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:09,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:10,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:10,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:10,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:10,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:10,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:10,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:10,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:11,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:12,345 INFO L134 CoverageAnalysis]: Checked inductivity of 6117 backedges. 931 proven. 254 refuted. 0 times theorem prover too weak. 4932 trivial. 0 not checked. [2020-07-20 13:39:12,346 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1157361671] [2020-07-20 13:39:12,346 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:12,346 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:39:12,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477795822] [2020-07-20 13:39:12,347 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:39:12,347 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:12,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:39:12,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:39:12,347 INFO L87 Difference]: Start difference. First operand 218 states and 439 transitions. Second operand 19 states. [2020-07-20 13:39:12,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:39:12,968 INFO L93 Difference]: Finished difference Result 245 states and 472 transitions. [2020-07-20 13:39:12,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:39:12,969 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 464 [2020-07-20 13:39:12,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:39:12,973 INFO L225 Difference]: With dead ends: 245 [2020-07-20 13:39:12,974 INFO L226 Difference]: Without dead ends: 230 [2020-07-20 13:39:12,977 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 934 GetRequests, 895 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:39:12,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2020-07-20 13:39:12,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 215. [2020-07-20 13:39:12,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2020-07-20 13:39:12,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 430 transitions. [2020-07-20 13:39:12,997 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 430 transitions. Word has length 464 [2020-07-20 13:39:12,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:39:12,998 INFO L479 AbstractCegarLoop]: Abstraction has 215 states and 430 transitions. [2020-07-20 13:39:12,998 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:39:12,998 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 430 transitions. [2020-07-20 13:39:13,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-20 13:39:13,001 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:39:13,002 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 31, 31, 27, 25, 17, 17, 17, 17, 17, 17, 17, 15, 15, 15, 15, 15, 15, 15, 12, 8, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:39:13,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:13,203 INFO L427 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:39:13,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:39:13,203 INFO L82 PathProgramCache]: Analyzing trace with hash 791007561, now seen corresponding path program 38 times [2020-07-20 13:39:13,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:39:13,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1757792524] [2020-07-20 13:39:13,204 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 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:14,064 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:39:14,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:14,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:39:14,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:14,229 INFO L134 CoverageAnalysis]: Checked inductivity of 5719 backedges. 599 proven. 177 refuted. 0 times theorem prover too weak. 4943 trivial. 0 not checked. [2020-07-20 13:39:14,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:15,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:15,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:16,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:16,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:16,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:16,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:16,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:16,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:17,812 INFO L134 CoverageAnalysis]: Checked inductivity of 5719 backedges. 599 proven. 187 refuted. 0 times theorem prover too weak. 4933 trivial. 0 not checked. [2020-07-20 13:39:17,813 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1757792524] [2020-07-20 13:39:17,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:17,813 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:39:17,813 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75430814] [2020-07-20 13:39:17,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:39:17,814 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:17,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:39:17,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:39:17,814 INFO L87 Difference]: Start difference. First operand 215 states and 430 transitions. Second operand 15 states. [2020-07-20 13:39:18,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:39:18,190 INFO L93 Difference]: Finished difference Result 251 states and 497 transitions. [2020-07-20 13:39:18,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:39:18,193 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 449 [2020-07-20 13:39:18,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:39:18,197 INFO L225 Difference]: With dead ends: 251 [2020-07-20 13:39:18,197 INFO L226 Difference]: Without dead ends: 236 [2020-07-20 13:39:18,198 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 902 GetRequests, 873 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:39:18,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2020-07-20 13:39:18,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 209. [2020-07-20 13:39:18,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2020-07-20 13:39:18,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 417 transitions. [2020-07-20 13:39:18,216 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 417 transitions. Word has length 449 [2020-07-20 13:39:18,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:39:18,217 INFO L479 AbstractCegarLoop]: Abstraction has 209 states and 417 transitions. [2020-07-20 13:39:18,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:39:18,217 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 417 transitions. [2020-07-20 13:39:18,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-20 13:39:18,220 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:39:18,220 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 26, 26, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 10, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:39:18,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:18,421 INFO L427 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:39:18,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:39:18,422 INFO L82 PathProgramCache]: Analyzing trace with hash -2131556107, now seen corresponding path program 39 times [2020-07-20 13:39:18,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:39:18,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [180413819] [2020-07-20 13:39:18,423 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 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:19,233 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:39:19,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:19,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:39:19,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:19,472 INFO L134 CoverageAnalysis]: Checked inductivity of 5706 backedges. 686 proven. 119 refuted. 0 times theorem prover too weak. 4901 trivial. 0 not checked. [2020-07-20 13:39:19,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:20,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:20,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:21,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:21,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:21,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:21,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:21,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:21,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:21,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:22,906 INFO L134 CoverageAnalysis]: Checked inductivity of 5706 backedges. 690 proven. 125 refuted. 0 times theorem prover too weak. 4891 trivial. 0 not checked. [2020-07-20 13:39:22,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [180413819] [2020-07-20 13:39:22,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:22,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:39:22,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071039789] [2020-07-20 13:39:22,907 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:39:22,907 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:22,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:39:22,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:39:22,908 INFO L87 Difference]: Start difference. First operand 209 states and 417 transitions. Second operand 15 states. [2020-07-20 13:39:23,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:39:23,208 INFO L93 Difference]: Finished difference Result 295 states and 696 transitions. [2020-07-20 13:39:23,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:39:23,210 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 449 [2020-07-20 13:39:23,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:39:23,215 INFO L225 Difference]: With dead ends: 295 [2020-07-20 13:39:23,215 INFO L226 Difference]: Without dead ends: 282 [2020-07-20 13:39:23,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 902 GetRequests, 873 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:39:23,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2020-07-20 13:39:23,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 232. [2020-07-20 13:39:23,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2020-07-20 13:39:23,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 511 transitions. [2020-07-20 13:39:23,238 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 511 transitions. Word has length 449 [2020-07-20 13:39:23,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:39:23,239 INFO L479 AbstractCegarLoop]: Abstraction has 232 states and 511 transitions. [2020-07-20 13:39:23,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:39:23,239 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 511 transitions. [2020-07-20 13:39:23,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2020-07-20 13:39:23,243 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:39:23,243 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 27, 27, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:39:23,443 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:23,444 INFO L427 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:39:23,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:39:23,444 INFO L82 PathProgramCache]: Analyzing trace with hash -1980042612, now seen corresponding path program 40 times [2020-07-20 13:39:23,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:39:23,445 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1821284843] [2020-07-20 13:39:23,445 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 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:24,261 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:39:24,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:24,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 1029 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:39:24,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:24,419 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 679 proven. 127 refuted. 0 times theorem prover too weak. 5276 trivial. 0 not checked. [2020-07-20 13:39:24,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:25,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:25,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:25,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:25,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:26,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:26,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:26,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:26,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:26,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:26,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:26,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:27,750 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 681 proven. 135 refuted. 0 times theorem prover too weak. 5266 trivial. 0 not checked. [2020-07-20 13:39:27,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1821284843] [2020-07-20 13:39:27,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:27,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:39:27,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088053126] [2020-07-20 13:39:27,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:39:27,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:27,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:39:27,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:39:27,752 INFO L87 Difference]: Start difference. First operand 232 states and 511 transitions. Second operand 15 states. [2020-07-20 13:39:28,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:39:28,062 INFO L93 Difference]: Finished difference Result 287 states and 649 transitions. [2020-07-20 13:39:28,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:39:28,064 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 463 [2020-07-20 13:39:28,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:39:28,070 INFO L225 Difference]: With dead ends: 287 [2020-07-20 13:39:28,070 INFO L226 Difference]: Without dead ends: 274 [2020-07-20 13:39:28,072 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 930 GetRequests, 901 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:39:28,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-20 13:39:28,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 229. [2020-07-20 13:39:28,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2020-07-20 13:39:28,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 498 transitions. [2020-07-20 13:39:28,101 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 498 transitions. Word has length 463 [2020-07-20 13:39:28,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:39:28,101 INFO L479 AbstractCegarLoop]: Abstraction has 229 states and 498 transitions. [2020-07-20 13:39:28,101 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:39:28,101 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 498 transitions. [2020-07-20 13:39:28,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 13:39:28,108 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:39:28,108 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 27, 27, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 10, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:39:28,321 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:28,322 INFO L427 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:39:28,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:39:28,323 INFO L82 PathProgramCache]: Analyzing trace with hash -589298496, now seen corresponding path program 41 times [2020-07-20 13:39:28,323 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:39:28,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2031241401] [2020-07-20 13:39:28,324 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 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:29,149 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:39:29,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:29,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 1083 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:39:29,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:29,335 INFO L134 CoverageAnalysis]: Checked inductivity of 6758 backedges. 848 proven. 183 refuted. 0 times theorem prover too weak. 5727 trivial. 0 not checked. [2020-07-20 13:39:29,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:30,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:31,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:31,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:31,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:31,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:31,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:31,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:31,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:31,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:31,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:32,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:33,619 INFO L134 CoverageAnalysis]: Checked inductivity of 6758 backedges. 854 proven. 191 refuted. 0 times theorem prover too weak. 5713 trivial. 0 not checked. [2020-07-20 13:39:33,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2031241401] [2020-07-20 13:39:33,619 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:33,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:39:33,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57445882] [2020-07-20 13:39:33,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:39:33,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:33,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:39:33,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:39:33,621 INFO L87 Difference]: Start difference. First operand 229 states and 498 transitions. Second operand 17 states. [2020-07-20 13:39:34,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:39:34,038 INFO L93 Difference]: Finished difference Result 273 states and 590 transitions. [2020-07-20 13:39:34,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:39:34,040 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 487 [2020-07-20 13:39:34,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:39:34,045 INFO L225 Difference]: With dead ends: 273 [2020-07-20 13:39:34,045 INFO L226 Difference]: Without dead ends: 260 [2020-07-20 13:39:34,047 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 945 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:39:34,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2020-07-20 13:39:34,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 209. [2020-07-20 13:39:34,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2020-07-20 13:39:34,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 402 transitions. [2020-07-20 13:39:34,067 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 402 transitions. Word has length 487 [2020-07-20 13:39:34,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:39:34,067 INFO L479 AbstractCegarLoop]: Abstraction has 209 states and 402 transitions. [2020-07-20 13:39:34,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:39:34,068 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 402 transitions. [2020-07-20 13:39:34,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 13:39:34,074 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:39:34,074 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 35, 35, 30, 29, 19, 19, 19, 19, 19, 19, 19, 17, 17, 17, 17, 17, 17, 17, 13, 10, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:39:34,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:34,289 INFO L427 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:39:34,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:39:34,290 INFO L82 PathProgramCache]: Analyzing trace with hash -386724651, now seen corresponding path program 42 times [2020-07-20 13:39:34,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:39:34,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1038607302] [2020-07-20 13:39:34,290 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 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:35,145 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:39:35,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:35,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 1120 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:39:35,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:35,365 INFO L134 CoverageAnalysis]: Checked inductivity of 7261 backedges. 1049 proven. 215 refuted. 0 times theorem prover too weak. 5997 trivial. 0 not checked. [2020-07-20 13:39:35,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:37,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:37,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:38,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:38,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:38,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:38,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:38,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:39,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:39,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:39,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:39,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:40,758 INFO L134 CoverageAnalysis]: Checked inductivity of 7261 backedges. 1049 proven. 239 refuted. 0 times theorem prover too weak. 5973 trivial. 0 not checked. [2020-07-20 13:39:40,758 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1038607302] [2020-07-20 13:39:40,758 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:40,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:39:40,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708835063] [2020-07-20 13:39:40,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:39:40,759 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:40,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:39:40,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:39:40,760 INFO L87 Difference]: Start difference. First operand 209 states and 402 transitions. Second operand 19 states. [2020-07-20 13:39:41,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:39:41,315 INFO L93 Difference]: Finished difference Result 267 states and 493 transitions. [2020-07-20 13:39:41,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:39:41,317 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 504 [2020-07-20 13:39:41,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:39:41,321 INFO L225 Difference]: With dead ends: 267 [2020-07-20 13:39:41,321 INFO L226 Difference]: Without dead ends: 254 [2020-07-20 13:39:41,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1014 GetRequests, 975 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:39:41,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2020-07-20 13:39:41,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 193. [2020-07-20 13:39:41,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2020-07-20 13:39:41,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 369 transitions. [2020-07-20 13:39:41,338 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 369 transitions. Word has length 504 [2020-07-20 13:39:41,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:39:41,338 INFO L479 AbstractCegarLoop]: Abstraction has 193 states and 369 transitions. [2020-07-20 13:39:41,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:39:41,338 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 369 transitions. [2020-07-20 13:39:41,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2020-07-20 13:39:41,342 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:39:41,342 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 33, 33, 28, 27, 18, 18, 18, 18, 18, 18, 18, 16, 16, 16, 16, 16, 16, 16, 12, 9, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:39:41,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:41,543 INFO L427 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:39:41,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:39:41,543 INFO L82 PathProgramCache]: Analyzing trace with hash -1552787645, now seen corresponding path program 43 times [2020-07-20 13:39:41,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:39:41,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [991405318] [2020-07-20 13:39:41,544 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 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:42,413 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:39:42,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:42,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 1058 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:39:42,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:42,624 INFO L134 CoverageAnalysis]: Checked inductivity of 6453 backedges. 904 proven. 124 refuted. 0 times theorem prover too weak. 5425 trivial. 0 not checked. [2020-07-20 13:39:42,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:44,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:44,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:44,786 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:45,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:45,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:45,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:45,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:45,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:45,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:45,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:45,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:45,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:47,088 INFO L134 CoverageAnalysis]: Checked inductivity of 6453 backedges. 904 proven. 142 refuted. 0 times theorem prover too weak. 5407 trivial. 0 not checked. [2020-07-20 13:39:47,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [991405318] [2020-07-20 13:39:47,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:47,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:39:47,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312930107] [2020-07-20 13:39:47,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:39:47,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:47,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:39:47,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:39:47,091 INFO L87 Difference]: Start difference. First operand 193 states and 369 transitions. Second operand 17 states. [2020-07-20 13:39:47,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:39:47,486 INFO L93 Difference]: Finished difference Result 209 states and 384 transitions. [2020-07-20 13:39:47,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:39:47,488 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 476 [2020-07-20 13:39:47,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:39:47,491 INFO L225 Difference]: With dead ends: 209 [2020-07-20 13:39:47,491 INFO L226 Difference]: Without dead ends: 196 [2020-07-20 13:39:47,492 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 957 GetRequests, 923 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:39:47,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2020-07-20 13:39:47,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 185. [2020-07-20 13:39:47,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 185 states. [2020-07-20 13:39:47,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 336 transitions. [2020-07-20 13:39:47,507 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 336 transitions. Word has length 476 [2020-07-20 13:39:47,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:39:47,507 INFO L479 AbstractCegarLoop]: Abstraction has 185 states and 336 transitions. [2020-07-20 13:39:47,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:39:47,507 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 336 transitions. [2020-07-20 13:39:47,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2020-07-20 13:39:47,511 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:39:47,511 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 27, 27, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:39:47,711 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:47,712 INFO L427 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:39:47,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:39:47,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1326629730, now seen corresponding path program 44 times [2020-07-20 13:39:47,713 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:39:47,713 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [636673898] [2020-07-20 13:39:47,714 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 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:48,589 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:39:48,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:48,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 1029 conjuncts, 271 conjunts are in the unsatisfiable core [2020-07-20 13:39:48,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:50,258 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2020-07-20 13:39:50,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:40:00,928 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2020-07-20 13:40:00,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [636673898] [2020-07-20 13:40:00,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:40:00,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 52 [2020-07-20 13:40:00,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123912997] [2020-07-20 13:40:00,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-20 13:40:00,930 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:40:00,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-20 13:40:00,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=2527, Unknown=0, NotChecked=0, Total=2652 [2020-07-20 13:40:00,931 INFO L87 Difference]: Start difference. First operand 185 states and 336 transitions. Second operand 52 states. [2020-07-20 13:40:03,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:40:03,653 INFO L93 Difference]: Finished difference Result 454 states and 1003 transitions. [2020-07-20 13:40:03,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 13:40:03,654 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 463 [2020-07-20 13:40:03,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:40:03,669 INFO L225 Difference]: With dead ends: 454 [2020-07-20 13:40:03,670 INFO L226 Difference]: Without dead ends: 447 [2020-07-20 13:40:03,676 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 933 GetRequests, 875 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=157, Invalid=3383, Unknown=0, NotChecked=0, Total=3540 [2020-07-20 13:40:03,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 447 states. [2020-07-20 13:40:03,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 447 to 310. [2020-07-20 13:40:03,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 310 states. [2020-07-20 13:40:03,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 693 transitions. [2020-07-20 13:40:03,740 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 693 transitions. Word has length 463 [2020-07-20 13:40:03,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:40:03,741 INFO L479 AbstractCegarLoop]: Abstraction has 310 states and 693 transitions. [2020-07-20 13:40:03,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-20 13:40:03,741 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 693 transitions. [2020-07-20 13:40:03,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 517 [2020-07-20 13:40:03,752 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:40:03,753 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 35, 35, 30, 29, 20, 20, 20, 20, 20, 20, 20, 17, 17, 17, 17, 17, 17, 17, 12, 11, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:40:03,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:03,968 INFO L427 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:40:03,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:40:03,969 INFO L82 PathProgramCache]: Analyzing trace with hash 1287449402, now seen corresponding path program 45 times [2020-07-20 13:40:03,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:40:03,969 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1872528395] [2020-07-20 13:40:03,969 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 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:04,861 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:40:04,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:40:04,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 934 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:40:04,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:40:05,127 INFO L134 CoverageAnalysis]: Checked inductivity of 7645 backedges. 369 proven. 993 refuted. 0 times theorem prover too weak. 6283 trivial. 0 not checked. [2020-07-20 13:40:05,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:40:08,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:10,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:10,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:10,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:10,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:10,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:11,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:11,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:11,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:11,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:11,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:11,654 INFO L134 CoverageAnalysis]: Checked inductivity of 7645 backedges. 375 proven. 1008 refuted. 0 times theorem prover too weak. 6262 trivial. 0 not checked. [2020-07-20 13:40:11,655 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1872528395] [2020-07-20 13:40:11,655 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:40:11,655 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:40:11,655 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988225385] [2020-07-20 13:40:11,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:40:11,656 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:40:11,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:40:11,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:40:11,656 INFO L87 Difference]: Start difference. First operand 310 states and 693 transitions. Second operand 19 states. [2020-07-20 13:40:12,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:40:12,439 INFO L93 Difference]: Finished difference Result 418 states and 952 transitions. [2020-07-20 13:40:12,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:40:12,443 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 516 [2020-07-20 13:40:12,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:40:12,450 INFO L225 Difference]: With dead ends: 418 [2020-07-20 13:40:12,450 INFO L226 Difference]: Without dead ends: 337 [2020-07-20 13:40:12,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1038 GetRequests, 999 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:40:12,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2020-07-20 13:40:12,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 316. [2020-07-20 13:40:12,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-20 13:40:12,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 699 transitions. [2020-07-20 13:40:12,498 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 699 transitions. Word has length 516 [2020-07-20 13:40:12,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:40:12,498 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 699 transitions. [2020-07-20 13:40:12,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:40:12,498 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 699 transitions. [2020-07-20 13:40:12,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-20 13:40:12,509 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:40:12,510 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 33, 33, 28, 28, 20, 20, 20, 20, 20, 20, 20, 16, 16, 16, 16, 16, 16, 16, 12, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:40:12,718 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:12,719 INFO L427 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:40:12,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:40:12,720 INFO L82 PathProgramCache]: Analyzing trace with hash -950975425, now seen corresponding path program 46 times [2020-07-20 13:40:12,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:40:12,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1642030063] [2020-07-20 13:40:12,721 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 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:13,632 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:40:13,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:40:13,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 912 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:40:13,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:40:13,872 INFO L134 CoverageAnalysis]: Checked inductivity of 7228 backedges. 587 proven. 659 refuted. 0 times theorem prover too weak. 5982 trivial. 0 not checked. [2020-07-20 13:40:13,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:40:17,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:17,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:18,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:18,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:18,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:18,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:18,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:18,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:18,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:19,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:19,858 INFO L134 CoverageAnalysis]: Checked inductivity of 7228 backedges. 589 proven. 683 refuted. 0 times theorem prover too weak. 5956 trivial. 0 not checked. [2020-07-20 13:40:19,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1642030063] [2020-07-20 13:40:19,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:40:19,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:40:19,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026220552] [2020-07-20 13:40:19,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:40:19,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:40:19,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:40:19,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:40:19,860 INFO L87 Difference]: Start difference. First operand 316 states and 699 transitions. Second operand 19 states. [2020-07-20 13:40:20,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:40:20,465 INFO L93 Difference]: Finished difference Result 399 states and 862 transitions. [2020-07-20 13:40:20,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:40:20,466 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 501 [2020-07-20 13:40:20,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:40:20,474 INFO L225 Difference]: With dead ends: 399 [2020-07-20 13:40:20,474 INFO L226 Difference]: Without dead ends: 387 [2020-07-20 13:40:20,477 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1008 GetRequests, 969 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:40:20,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2020-07-20 13:40:20,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 324. [2020-07-20 13:40:20,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 324 states. [2020-07-20 13:40:20,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 721 transitions. [2020-07-20 13:40:20,523 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 721 transitions. Word has length 501 [2020-07-20 13:40:20,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:40:20,524 INFO L479 AbstractCegarLoop]: Abstraction has 324 states and 721 transitions. [2020-07-20 13:40:20,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:40:20,524 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 721 transitions. [2020-07-20 13:40:20,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2020-07-20 13:40:20,535 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:40:20,535 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 30, 28, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 13, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:40:20,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:20,749 INFO L427 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:40:20,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:40:20,750 INFO L82 PathProgramCache]: Analyzing trace with hash -2079484006, now seen corresponding path program 47 times [2020-07-20 13:40:20,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:40:20,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1966622878] [2020-07-20 13:40:20,751 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 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:21,693 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:40:21,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:40:21,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 1091 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:40:21,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:40:21,905 INFO L134 CoverageAnalysis]: Checked inductivity of 6869 backedges. 520 proven. 543 refuted. 0 times theorem prover too weak. 5806 trivial. 0 not checked. [2020-07-20 13:40:21,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:40:24,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:24,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:25,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:25,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:25,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:25,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:25,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:25,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:25,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:26,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:27,039 INFO L134 CoverageAnalysis]: Checked inductivity of 6869 backedges. 524 proven. 557 refuted. 0 times theorem prover too weak. 5788 trivial. 0 not checked. [2020-07-20 13:40:27,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1966622878] [2020-07-20 13:40:27,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:40:27,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:40:27,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357851164] [2020-07-20 13:40:27,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:40:27,042 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:40:27,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:40:27,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:40:27,042 INFO L87 Difference]: Start difference. First operand 324 states and 721 transitions. Second operand 17 states. [2020-07-20 13:40:27,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:40:27,506 INFO L93 Difference]: Finished difference Result 384 states and 858 transitions. [2020-07-20 13:40:27,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:40:27,509 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 491 [2020-07-20 13:40:27,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:40:27,518 INFO L225 Difference]: With dead ends: 384 [2020-07-20 13:40:27,518 INFO L226 Difference]: Without dead ends: 372 [2020-07-20 13:40:27,521 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 987 GetRequests, 953 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:40:27,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2020-07-20 13:40:27,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 329. [2020-07-20 13:40:27,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 329 states. [2020-07-20 13:40:27,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 742 transitions. [2020-07-20 13:40:27,577 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 742 transitions. Word has length 491 [2020-07-20 13:40:27,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:40:27,577 INFO L479 AbstractCegarLoop]: Abstraction has 329 states and 742 transitions. [2020-07-20 13:40:27,577 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:40:27,578 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 742 transitions. [2020-07-20 13:40:27,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 526 [2020-07-20 13:40:27,589 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:40:27,590 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 35, 35, 29, 27, 21, 21, 21, 21, 21, 21, 21, 17, 17, 17, 17, 17, 17, 17, 13, 12, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:40:27,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:27,804 INFO L427 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:40:27,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:40:27,805 INFO L82 PathProgramCache]: Analyzing trace with hash 939679557, now seen corresponding path program 48 times [2020-07-20 13:40:27,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:40:27,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2030647995] [2020-07-20 13:40:27,806 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 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:28,753 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:40:28,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:40:28,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 956 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 13:40:28,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:40:29,059 INFO L134 CoverageAnalysis]: Checked inductivity of 7965 backedges. 291 proven. 1093 refuted. 0 times theorem prover too weak. 6581 trivial. 0 not checked. [2020-07-20 13:40:29,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:40:32,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:32,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:34,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:35,142 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 13:40:35,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:35,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:35,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:35,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:36,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:36,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:36,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:36,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:36,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:36,576 INFO L134 CoverageAnalysis]: Checked inductivity of 7965 backedges. 292 proven. 1113 refuted. 0 times theorem prover too weak. 6560 trivial. 0 not checked. [2020-07-20 13:40:36,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2030647995] [2020-07-20 13:40:36,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:40:36,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 18] total 21 [2020-07-20 13:40:36,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561374445] [2020-07-20 13:40:36,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:40:36,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:40:36,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:40:36,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:40:36,579 INFO L87 Difference]: Start difference. First operand 329 states and 742 transitions. Second operand 21 states. [2020-07-20 13:40:37,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:40:37,491 INFO L93 Difference]: Finished difference Result 517 states and 1195 transitions. [2020-07-20 13:40:37,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:40:37,493 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 525 [2020-07-20 13:40:37,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:40:37,502 INFO L225 Difference]: With dead ends: 517 [2020-07-20 13:40:37,503 INFO L226 Difference]: Without dead ends: 335 [2020-07-20 13:40:37,509 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1056 GetRequests, 1015 SyntacticMatches, 15 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=161, Invalid=595, Unknown=0, NotChecked=0, Total=756 [2020-07-20 13:40:37,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2020-07-20 13:40:37,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 329. [2020-07-20 13:40:37,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 329 states. [2020-07-20 13:40:37,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 722 transitions. [2020-07-20 13:40:37,557 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 722 transitions. Word has length 525 [2020-07-20 13:40:37,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:40:37,557 INFO L479 AbstractCegarLoop]: Abstraction has 329 states and 722 transitions. [2020-07-20 13:40:37,557 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:40:37,557 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 722 transitions. [2020-07-20 13:40:37,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 511 [2020-07-20 13:40:37,565 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:40:37,565 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 35, 35, 27, 26, 20, 20, 20, 20, 20, 20, 20, 17, 17, 17, 17, 17, 17, 17, 13, 10, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:40:37,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:37,766 INFO L427 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:40:37,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:40:37,767 INFO L82 PathProgramCache]: Analyzing trace with hash 1487960292, now seen corresponding path program 49 times [2020-07-20 13:40:37,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:40:37,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1991078233] [2020-07-20 13:40:37,768 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 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:38,725 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:40:38,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:40:38,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 927 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 13:40:38,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:40:39,018 INFO L134 CoverageAnalysis]: Checked inductivity of 7480 backedges. 332 proven. 1008 refuted. 0 times theorem prover too weak. 6140 trivial. 0 not checked. [2020-07-20 13:40:39,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:40:43,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:44,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:45,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:45,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:45,620 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 13:40:45,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:46,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:46,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:46,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:46,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:46,635 INFO L134 CoverageAnalysis]: Checked inductivity of 7480 backedges. 331 proven. 1030 refuted. 0 times theorem prover too weak. 6119 trivial. 0 not checked. [2020-07-20 13:40:46,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1991078233] [2020-07-20 13:40:46,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:40:46,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 18] total 21 [2020-07-20 13:40:46,636 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807985402] [2020-07-20 13:40:46,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:40:46,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:40:46,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:40:46,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:40:46,637 INFO L87 Difference]: Start difference. First operand 329 states and 722 transitions. Second operand 21 states. [2020-07-20 13:40:47,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:40:47,579 INFO L93 Difference]: Finished difference Result 401 states and 873 transitions. [2020-07-20 13:40:47,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:40:47,582 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 510 [2020-07-20 13:40:47,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:40:47,590 INFO L225 Difference]: With dead ends: 401 [2020-07-20 13:40:47,590 INFO L226 Difference]: Without dead ends: 335 [2020-07-20 13:40:47,594 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1026 GetRequests, 985 SyntacticMatches, 15 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=161, Invalid=595, Unknown=0, NotChecked=0, Total=756 [2020-07-20 13:40:47,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2020-07-20 13:40:47,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 326. [2020-07-20 13:40:47,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 326 states. [2020-07-20 13:40:47,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 699 transitions. [2020-07-20 13:40:47,643 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 699 transitions. Word has length 510 [2020-07-20 13:40:47,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:40:47,643 INFO L479 AbstractCegarLoop]: Abstraction has 326 states and 699 transitions. [2020-07-20 13:40:47,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:40:47,644 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 699 transitions. [2020-07-20 13:40:47,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-20 13:40:47,655 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:40:47,655 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 35, 35, 29, 27, 19, 19, 19, 19, 19, 19, 19, 17, 17, 17, 17, 17, 17, 17, 12, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:40:47,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:47,870 INFO L427 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:40:47,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:40:47,871 INFO L82 PathProgramCache]: Analyzing trace with hash 133293241, now seen corresponding path program 50 times [2020-07-20 13:40:47,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:40:47,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1081942185] [2020-07-20 13:40:47,871 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 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:48,847 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:40:48,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:40:48,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 911 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:40:48,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:40:49,108 INFO L134 CoverageAnalysis]: Checked inductivity of 7177 backedges. 385 proven. 868 refuted. 0 times theorem prover too weak. 5924 trivial. 0 not checked. [2020-07-20 13:40:49,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:40:52,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:54,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:54,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:55,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:55,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:55,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:55,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:55,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:55,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:55,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:56,400 INFO L134 CoverageAnalysis]: Checked inductivity of 7177 backedges. 391 proven. 886 refuted. 0 times theorem prover too weak. 5900 trivial. 0 not checked. [2020-07-20 13:40:56,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1081942185] [2020-07-20 13:40:56,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:40:56,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:40:56,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205112385] [2020-07-20 13:40:56,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:40:56,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:40:56,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:40:56,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:40:56,402 INFO L87 Difference]: Start difference. First operand 326 states and 699 transitions. Second operand 19 states. [2020-07-20 13:40:57,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:40:57,169 INFO L93 Difference]: Finished difference Result 376 states and 779 transitions. [2020-07-20 13:40:57,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:40:57,171 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 501 [2020-07-20 13:40:57,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:40:57,180 INFO L225 Difference]: With dead ends: 376 [2020-07-20 13:40:57,181 INFO L226 Difference]: Without dead ends: 359 [2020-07-20 13:40:57,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1008 GetRequests, 969 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:40:57,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2020-07-20 13:40:57,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 316. [2020-07-20 13:40:57,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-20 13:40:57,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 672 transitions. [2020-07-20 13:40:57,232 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 672 transitions. Word has length 501 [2020-07-20 13:40:57,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:40:57,232 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 672 transitions. [2020-07-20 13:40:57,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:40:57,232 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 672 transitions. [2020-07-20 13:40:57,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 502 [2020-07-20 13:40:57,244 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:40:57,245 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 33, 33, 28, 28, 20, 20, 20, 20, 20, 20, 20, 16, 16, 16, 16, 16, 16, 16, 12, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:40:57,457 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:57,458 INFO L427 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:40:57,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:40:57,459 INFO L82 PathProgramCache]: Analyzing trace with hash -848982665, now seen corresponding path program 51 times [2020-07-20 13:40:57,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:40:57,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1346226381] [2020-07-20 13:40:57,459 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 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:58,457 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:40:58,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:40:58,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 912 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 13:40:58,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:40:58,814 INFO L134 CoverageAnalysis]: Checked inductivity of 7228 backedges. 610 proven. 705 refuted. 0 times theorem prover too weak. 5913 trivial. 0 not checked. [2020-07-20 13:40:58,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:41:03,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:03,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:04,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:04,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:05,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:05,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:05,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:05,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:06,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:06,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:06,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:06,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:06,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:07,697 INFO L134 CoverageAnalysis]: Checked inductivity of 7228 backedges. 607 proven. 729 refuted. 0 times theorem prover too weak. 5892 trivial. 0 not checked. [2020-07-20 13:41:07,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1346226381] [2020-07-20 13:41:07,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:41:07,698 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 18] total 21 [2020-07-20 13:41:07,700 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751042441] [2020-07-20 13:41:07,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:41:07,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:41:07,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:41:07,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:41:07,702 INFO L87 Difference]: Start difference. First operand 316 states and 672 transitions. Second operand 21 states. [2020-07-20 13:41:09,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:41:09,008 INFO L93 Difference]: Finished difference Result 415 states and 851 transitions. [2020-07-20 13:41:09,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:41:09,012 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 501 [2020-07-20 13:41:09,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:41:09,024 INFO L225 Difference]: With dead ends: 415 [2020-07-20 13:41:09,024 INFO L226 Difference]: Without dead ends: 403 [2020-07-20 13:41:09,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1008 GetRequests, 967 SyntacticMatches, 15 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=161, Invalid=595, Unknown=0, NotChecked=0, Total=756 [2020-07-20 13:41:09,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2020-07-20 13:41:09,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 321. [2020-07-20 13:41:09,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 321 states. [2020-07-20 13:41:09,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 321 states to 321 states and 690 transitions. [2020-07-20 13:41:09,087 INFO L78 Accepts]: Start accepts. Automaton has 321 states and 690 transitions. Word has length 501 [2020-07-20 13:41:09,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:41:09,088 INFO L479 AbstractCegarLoop]: Abstraction has 321 states and 690 transitions. [2020-07-20 13:41:09,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:41:09,088 INFO L276 IsEmpty]: Start isEmpty. Operand 321 states and 690 transitions. [2020-07-20 13:41:09,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 13:41:09,103 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:41:09,103 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 27, 27, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 10, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:41:09,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:41:09,318 INFO L427 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:41:09,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:41:09,321 INFO L82 PathProgramCache]: Analyzing trace with hash -1886228968, now seen corresponding path program 52 times [2020-07-20 13:41:09,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:41:09,322 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [112180097] [2020-07-20 13:41:09,322 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 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:41:10,457 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:41:10,457 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:41:10,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 1083 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:41:10,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:41:10,670 INFO L134 CoverageAnalysis]: Checked inductivity of 6758 backedges. 695 proven. 157 refuted. 0 times theorem prover too weak. 5906 trivial. 0 not checked. [2020-07-20 13:41:10,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:41:12,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:12,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:12,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:13,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:13,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:13,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:13,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:13,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:14,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:15,637 INFO L134 CoverageAnalysis]: Checked inductivity of 6758 backedges. 697 proven. 165 refuted. 0 times theorem prover too weak. 5896 trivial. 0 not checked. [2020-07-20 13:41:15,637 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [112180097] [2020-07-20 13:41:15,637 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:41:15,637 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:41:15,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873143733] [2020-07-20 13:41:15,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:41:15,638 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:41:15,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:41:15,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:41:15,639 INFO L87 Difference]: Start difference. First operand 321 states and 690 transitions. Second operand 15 states. [2020-07-20 13:41:16,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:41:16,131 INFO L93 Difference]: Finished difference Result 362 states and 773 transitions. [2020-07-20 13:41:16,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:41:16,135 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 487 [2020-07-20 13:41:16,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:41:16,141 INFO L225 Difference]: With dead ends: 362 [2020-07-20 13:41:16,141 INFO L226 Difference]: Without dead ends: 343 [2020-07-20 13:41:16,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 978 GetRequests, 949 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:41:16,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2020-07-20 13:41:16,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 286. [2020-07-20 13:41:16,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2020-07-20 13:41:16,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 595 transitions. [2020-07-20 13:41:16,187 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 595 transitions. Word has length 487 [2020-07-20 13:41:16,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:41:16,188 INFO L479 AbstractCegarLoop]: Abstraction has 286 states and 595 transitions. [2020-07-20 13:41:16,188 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:41:16,188 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 595 transitions. [2020-07-20 13:41:16,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 524 [2020-07-20 13:41:16,197 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:41:16,197 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 34, 27, 27, 21, 21, 21, 21, 21, 21, 21, 17, 17, 17, 17, 17, 17, 17, 16, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:41:16,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:41:16,398 INFO L427 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:41:16,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:41:16,399 INFO L82 PathProgramCache]: Analyzing trace with hash 987141147, now seen corresponding path program 53 times [2020-07-20 13:41:16,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:41:16,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1908008259] [2020-07-20 13:41:16,400 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 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:41:17,531 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:41:17,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:41:17,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 950 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 13:41:17,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:41:17,813 INFO L134 CoverageAnalysis]: Checked inductivity of 7942 backedges. 314 proven. 887 refuted. 0 times theorem prover too weak. 6741 trivial. 0 not checked. [2020-07-20 13:41:17,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:41:22,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:22,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:23,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:24,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:24,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:24,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:25,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:25,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:25,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:25,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:25,628 INFO L134 CoverageAnalysis]: Checked inductivity of 7942 backedges. 318 proven. 897 refuted. 0 times theorem prover too weak. 6727 trivial. 0 not checked. [2020-07-20 13:41:25,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1908008259] [2020-07-20 13:41:25,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:41:25,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-20 13:41:25,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087524716] [2020-07-20 13:41:25,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:41:25,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:41:25,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:41:25,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:41:25,630 INFO L87 Difference]: Start difference. First operand 286 states and 595 transitions. Second operand 19 states. [2020-07-20 13:41:26,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:41:26,367 INFO L93 Difference]: Finished difference Result 373 states and 777 transitions. [2020-07-20 13:41:26,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:41:26,369 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 523 [2020-07-20 13:41:26,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:41:26,375 INFO L225 Difference]: With dead ends: 373 [2020-07-20 13:41:26,376 INFO L226 Difference]: Without dead ends: 307 [2020-07-20 13:41:26,379 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1051 GetRequests, 1015 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:41:26,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2020-07-20 13:41:26,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 289. [2020-07-20 13:41:26,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2020-07-20 13:41:26,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 579 transitions. [2020-07-20 13:41:26,407 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 579 transitions. Word has length 523 [2020-07-20 13:41:26,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:41:26,408 INFO L479 AbstractCegarLoop]: Abstraction has 289 states and 579 transitions. [2020-07-20 13:41:26,408 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:41:26,408 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 579 transitions. [2020-07-20 13:41:26,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 476 [2020-07-20 13:41:26,413 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:41:26,414 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 33, 33, 27, 27, 18, 18, 18, 18, 18, 18, 18, 16, 16, 16, 16, 16, 16, 16, 11, 9, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:41:26,614 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:41:26,614 INFO L427 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:41:26,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:41:26,615 INFO L82 PathProgramCache]: Analyzing trace with hash 2032091979, now seen corresponding path program 54 times [2020-07-20 13:41:26,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:41:26,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [271732613] [2020-07-20 13:41:26,616 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 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:41:27,649 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:41:27,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:41:27,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 862 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 13:41:27,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:41:28,086 INFO L134 CoverageAnalysis]: Checked inductivity of 6426 backedges. 401 proven. 839 refuted. 0 times theorem prover too weak. 5186 trivial. 0 not checked. [2020-07-20 13:41:28,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:41:30,156 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 40 [2020-07-20 13:41:32,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:32,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:34,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:34,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:35,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:35,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:35,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:35,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:36,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:36,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:36,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:36,978 INFO L134 CoverageAnalysis]: Checked inductivity of 6426 backedges. 400 proven. 861 refuted. 0 times theorem prover too weak. 5165 trivial. 0 not checked. [2020-07-20 13:41:36,978 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [271732613] [2020-07-20 13:41:36,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:41:36,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 18] total 21 [2020-07-20 13:41:36,979 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202083421] [2020-07-20 13:41:36,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:41:36,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:41:36,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:41:36,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:41:36,980 INFO L87 Difference]: Start difference. First operand 289 states and 579 transitions. Second operand 21 states. [2020-07-20 13:41:38,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:41:38,031 INFO L93 Difference]: Finished difference Result 337 states and 648 transitions. [2020-07-20 13:41:38,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:41:38,035 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 475 [2020-07-20 13:41:38,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:41:38,041 INFO L225 Difference]: With dead ends: 337 [2020-07-20 13:41:38,041 INFO L226 Difference]: Without dead ends: 320 [2020-07-20 13:41:38,043 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 956 GetRequests, 915 SyntacticMatches, 15 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=161, Invalid=595, Unknown=0, NotChecked=0, Total=756 [2020-07-20 13:41:38,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2020-07-20 13:41:38,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 276. [2020-07-20 13:41:38,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 276 states. [2020-07-20 13:41:38,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 549 transitions. [2020-07-20 13:41:38,071 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 549 transitions. Word has length 475 [2020-07-20 13:41:38,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:41:38,071 INFO L479 AbstractCegarLoop]: Abstraction has 276 states and 549 transitions. [2020-07-20 13:41:38,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:41:38,071 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 549 transitions. [2020-07-20 13:41:38,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 476 [2020-07-20 13:41:38,077 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:41:38,077 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 27, 27, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 10, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:41:38,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:41:38,278 INFO L427 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:41:38,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:41:38,279 INFO L82 PathProgramCache]: Analyzing trace with hash -1832329655, now seen corresponding path program 55 times [2020-07-20 13:41:38,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:41:38,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1648701466] [2020-07-20 13:41:38,280 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 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:41:39,353 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:41:39,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:41:39,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 1056 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 13:41:39,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:41:39,890 INFO L134 CoverageAnalysis]: Checked inductivity of 6414 backedges. 563 proven. 518 refuted. 0 times theorem prover too weak. 5333 trivial. 0 not checked. [2020-07-20 13:41:39,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:41:44,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:44,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:45,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:45,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:45,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:45,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:45,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:46,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:46,790 INFO L134 CoverageAnalysis]: Checked inductivity of 6414 backedges. 563 proven. 532 refuted. 0 times theorem prover too weak. 5319 trivial. 0 not checked. [2020-07-20 13:41:46,790 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1648701466] [2020-07-20 13:41:46,790 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:41:46,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-20 13:41:46,791 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71831423] [2020-07-20 13:41:46,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:41:46,791 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:41:46,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:41:46,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:41:46,792 INFO L87 Difference]: Start difference. First operand 276 states and 549 transitions. Second operand 19 states. [2020-07-20 13:41:47,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:41:47,616 INFO L93 Difference]: Finished difference Result 306 states and 586 transitions. [2020-07-20 13:41:47,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:41:47,620 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 475 [2020-07-20 13:41:47,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:41:47,625 INFO L225 Difference]: With dead ends: 306 [2020-07-20 13:41:47,625 INFO L226 Difference]: Without dead ends: 294 [2020-07-20 13:41:47,627 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 955 GetRequests, 919 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:41:47,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2020-07-20 13:41:47,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 274. [2020-07-20 13:41:47,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2020-07-20 13:41:47,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 538 transitions. [2020-07-20 13:41:47,654 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 538 transitions. Word has length 475 [2020-07-20 13:41:47,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:41:47,654 INFO L479 AbstractCegarLoop]: Abstraction has 274 states and 538 transitions. [2020-07-20 13:41:47,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:41:47,654 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 538 transitions. [2020-07-20 13:41:47,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 512 [2020-07-20 13:41:47,660 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:41:47,660 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 37, 27, 27, 19, 19, 19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 18, 18, 11, 10, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:41:47,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:41:47,861 INFO L427 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:41:47,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:41:47,862 INFO L82 PathProgramCache]: Analyzing trace with hash 902199074, now seen corresponding path program 56 times [2020-07-20 13:41:47,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:41:47,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1819596307] [2020-07-20 13:41:47,863 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 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:41:48,938 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:41:48,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:41:48,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 927 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 13:41:48,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:41:49,304 INFO L134 CoverageAnalysis]: Checked inductivity of 7474 backedges. 375 proven. 794 refuted. 0 times theorem prover too weak. 6305 trivial. 0 not checked. [2020-07-20 13:41:49,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:41:54,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:55,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:55,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:56,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:56,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:56,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:56,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:56,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:56,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:41:57,641 INFO L134 CoverageAnalysis]: Checked inductivity of 7474 backedges. 377 proven. 808 refuted. 0 times theorem prover too weak. 6289 trivial. 0 not checked. [2020-07-20 13:41:57,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1819596307] [2020-07-20 13:41:57,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:41:57,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-20 13:41:57,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381015398] [2020-07-20 13:41:57,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:41:57,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:41:57,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:41:57,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:41:57,643 INFO L87 Difference]: Start difference. First operand 274 states and 538 transitions. Second operand 19 states. [2020-07-20 13:41:58,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:41:58,272 INFO L93 Difference]: Finished difference Result 375 states and 765 transitions. [2020-07-20 13:41:58,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:41:58,274 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 511 [2020-07-20 13:41:58,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:41:58,282 INFO L225 Difference]: With dead ends: 375 [2020-07-20 13:41:58,282 INFO L226 Difference]: Without dead ends: 340 [2020-07-20 13:41:58,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1027 GetRequests, 991 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:41:58,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2020-07-20 13:41:58,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 284. [2020-07-20 13:41:58,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-20 13:41:58,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 564 transitions. [2020-07-20 13:41:58,317 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 564 transitions. Word has length 511 [2020-07-20 13:41:58,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:41:58,317 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 564 transitions. [2020-07-20 13:41:58,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:41:58,317 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 564 transitions. [2020-07-20 13:41:58,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 476 [2020-07-20 13:41:58,322 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:41:58,322 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 27, 27, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 10, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:41:58,523 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:41:58,523 INFO L427 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:41:58,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:41:58,524 INFO L82 PathProgramCache]: Analyzing trace with hash -1184834597, now seen corresponding path program 57 times [2020-07-20 13:41:58,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:41:58,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [932117363] [2020-07-20 13:41:58,525 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 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:41:59,581 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:41:59,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:41:59,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 862 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 13:41:59,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:41:59,919 INFO L134 CoverageAnalysis]: Checked inductivity of 6414 backedges. 503 proven. 578 refuted. 0 times theorem prover too weak. 5333 trivial. 0 not checked. [2020-07-20 13:41:59,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:42:04,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:04,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:05,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:05,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:06,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:06,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:06,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:06,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:06,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:06,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:06,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:07,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:08,331 INFO L134 CoverageAnalysis]: Checked inductivity of 6414 backedges. 505 proven. 590 refuted. 0 times theorem prover too weak. 5319 trivial. 0 not checked. [2020-07-20 13:42:08,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [932117363] [2020-07-20 13:42:08,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:42:08,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-20 13:42:08,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340925354] [2020-07-20 13:42:08,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:42:08,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:42:08,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:42:08,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:42:08,333 INFO L87 Difference]: Start difference. First operand 284 states and 564 transitions. Second operand 19 states. [2020-07-20 13:42:09,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:42:09,096 INFO L93 Difference]: Finished difference Result 393 states and 772 transitions. [2020-07-20 13:42:09,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:42:09,098 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 475 [2020-07-20 13:42:09,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:42:09,106 INFO L225 Difference]: With dead ends: 393 [2020-07-20 13:42:09,106 INFO L226 Difference]: Without dead ends: 370 [2020-07-20 13:42:09,109 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 955 GetRequests, 919 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:42:09,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2020-07-20 13:42:09,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 258. [2020-07-20 13:42:09,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 258 states. [2020-07-20 13:42:09,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 504 transitions. [2020-07-20 13:42:09,145 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 504 transitions. Word has length 475 [2020-07-20 13:42:09,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:42:09,146 INFO L479 AbstractCegarLoop]: Abstraction has 258 states and 504 transitions. [2020-07-20 13:42:09,146 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:42:09,146 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 504 transitions. [2020-07-20 13:42:09,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-20 13:42:09,151 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:42:09,151 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 28, 28, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 12, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:42:09,352 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:42:09,352 INFO L427 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:42:09,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:42:09,353 INFO L82 PathProgramCache]: Analyzing trace with hash -1547613970, now seen corresponding path program 58 times [2020-07-20 13:42:09,353 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:42:09,354 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [715097238] [2020-07-20 13:42:09,354 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 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:42:10,533 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:42:10,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:42:10,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 1033 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:42:10,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:42:10,845 INFO L134 CoverageAnalysis]: Checked inductivity of 6136 backedges. 862 proven. 139 refuted. 0 times theorem prover too weak. 5135 trivial. 0 not checked. [2020-07-20 13:42:10,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:42:13,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:13,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:14,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:14,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:14,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:14,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:14,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:14,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:15,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:15,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:15,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:15,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:16,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:18,459 INFO L134 CoverageAnalysis]: Checked inductivity of 6136 backedges. 864 proven. 155 refuted. 0 times theorem prover too weak. 5117 trivial. 0 not checked. [2020-07-20 13:42:18,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [715097238] [2020-07-20 13:42:18,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:42:18,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:42:18,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294918979] [2020-07-20 13:42:18,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:42:18,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:42:18,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:42:18,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:42:18,461 INFO L87 Difference]: Start difference. First operand 258 states and 504 transitions. Second operand 17 states. [2020-07-20 13:42:19,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:42:19,216 INFO L93 Difference]: Finished difference Result 326 states and 626 transitions. [2020-07-20 13:42:19,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:42:19,216 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 465 [2020-07-20 13:42:19,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:42:19,223 INFO L225 Difference]: With dead ends: 326 [2020-07-20 13:42:19,224 INFO L226 Difference]: Without dead ends: 313 [2020-07-20 13:42:19,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 935 GetRequests, 901 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:42:19,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2020-07-20 13:42:19,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 263. [2020-07-20 13:42:19,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 263 states. [2020-07-20 13:42:19,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 521 transitions. [2020-07-20 13:42:19,256 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 521 transitions. Word has length 465 [2020-07-20 13:42:19,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:42:19,256 INFO L479 AbstractCegarLoop]: Abstraction has 263 states and 521 transitions. [2020-07-20 13:42:19,257 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:42:19,257 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 521 transitions. [2020-07-20 13:42:19,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 13:42:19,262 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:42:19,262 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 33, 33, 27, 27, 19, 19, 19, 19, 19, 19, 19, 16, 16, 16, 16, 16, 16, 16, 11, 11, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:42:19,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:42:19,463 INFO L427 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:42:19,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:42:19,464 INFO L82 PathProgramCache]: Analyzing trace with hash 67437136, now seen corresponding path program 59 times [2020-07-20 13:42:19,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:42:19,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [217946751] [2020-07-20 13:42:19,465 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 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:42:20,566 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:42:20,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:42:20,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 1083 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 13:42:20,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:42:21,003 INFO L134 CoverageAnalysis]: Checked inductivity of 6790 backedges. 471 proven. 463 refuted. 0 times theorem prover too weak. 5856 trivial. 0 not checked. [2020-07-20 13:42:21,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:42:25,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:25,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:26,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:26,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:26,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:26,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:27,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:27,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:27,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:28,953 INFO L134 CoverageAnalysis]: Checked inductivity of 6790 backedges. 471 proven. 473 refuted. 0 times theorem prover too weak. 5846 trivial. 0 not checked. [2020-07-20 13:42:28,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [217946751] [2020-07-20 13:42:28,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:42:28,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-20 13:42:28,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396738487] [2020-07-20 13:42:28,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:42:28,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:42:28,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:42:28,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:42:28,955 INFO L87 Difference]: Start difference. First operand 263 states and 521 transitions. Second operand 17 states. [2020-07-20 13:42:29,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:42:29,734 INFO L93 Difference]: Finished difference Result 329 states and 614 transitions. [2020-07-20 13:42:29,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:42:29,736 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 487 [2020-07-20 13:42:29,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:42:29,742 INFO L225 Difference]: With dead ends: 329 [2020-07-20 13:42:29,742 INFO L226 Difference]: Without dead ends: 306 [2020-07-20 13:42:29,744 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 978 GetRequests, 947 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:42:29,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2020-07-20 13:42:29,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 260. [2020-07-20 13:42:29,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2020-07-20 13:42:29,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 516 transitions. [2020-07-20 13:42:29,770 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 516 transitions. Word has length 487 [2020-07-20 13:42:29,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:42:29,770 INFO L479 AbstractCegarLoop]: Abstraction has 260 states and 516 transitions. [2020-07-20 13:42:29,770 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:42:29,770 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 516 transitions. [2020-07-20 13:42:29,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 489 [2020-07-20 13:42:29,775 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:42:29,775 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 33, 33, 28, 27, 19, 19, 19, 19, 19, 19, 19, 16, 16, 16, 16, 16, 16, 16, 12, 10, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:42:29,976 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:42:29,976 INFO L427 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:42:29,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:42:29,977 INFO L82 PathProgramCache]: Analyzing trace with hash 596449208, now seen corresponding path program 60 times [2020-07-20 13:42:29,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:42:29,978 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1066886303] [2020-07-20 13:42:29,978 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 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:42:31,112 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:42:31,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:42:31,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 1085 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:42:31,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:42:31,418 INFO L134 CoverageAnalysis]: Checked inductivity of 6817 backedges. 807 proven. 251 refuted. 0 times theorem prover too weak. 5759 trivial. 0 not checked. [2020-07-20 13:42:31,419 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:42:34,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:34,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:35,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:36,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:36,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:36,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:36,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:36,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:36,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:37,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:40,573 WARN L193 SmtUtils]: Spent 826.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:42:40,890 INFO L134 CoverageAnalysis]: Checked inductivity of 6817 backedges. 809 proven. 267 refuted. 0 times theorem prover too weak. 5741 trivial. 0 not checked. [2020-07-20 13:42:40,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1066886303] [2020-07-20 13:42:40,890 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:42:40,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:42:40,891 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499386427] [2020-07-20 13:42:40,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:42:40,892 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:42:40,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:42:40,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:42:40,892 INFO L87 Difference]: Start difference. First operand 260 states and 516 transitions. Second operand 17 states. [2020-07-20 13:42:41,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:42:41,709 INFO L93 Difference]: Finished difference Result 307 states and 575 transitions. [2020-07-20 13:42:41,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:42:41,710 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 488 [2020-07-20 13:42:41,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:42:41,714 INFO L225 Difference]: With dead ends: 307 [2020-07-20 13:42:41,714 INFO L226 Difference]: Without dead ends: 284 [2020-07-20 13:42:41,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 981 GetRequests, 947 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:42:41,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2020-07-20 13:42:41,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 263. [2020-07-20 13:42:41,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 263 states. [2020-07-20 13:42:41,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 516 transitions. [2020-07-20 13:42:41,752 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 516 transitions. Word has length 488 [2020-07-20 13:42:41,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:42:41,752 INFO L479 AbstractCegarLoop]: Abstraction has 263 states and 516 transitions. [2020-07-20 13:42:41,752 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:42:41,752 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 516 transitions. [2020-07-20 13:42:41,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 465 [2020-07-20 13:42:41,758 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:42:41,758 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 28, 27, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 11, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:42:41,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:42:41,959 INFO L427 AbstractCegarLoop]: === Iteration 78 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:42:41,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:42:41,960 INFO L82 PathProgramCache]: Analyzing trace with hash -1159776596, now seen corresponding path program 61 times [2020-07-20 13:42:41,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:42:41,961 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1592987364] [2020-07-20 13:42:41,961 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 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:42:43,108 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:42:43,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:42:43,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 1031 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:42:43,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:42:43,379 INFO L134 CoverageAnalysis]: Checked inductivity of 6109 backedges. 717 proven. 112 refuted. 0 times theorem prover too weak. 5280 trivial. 0 not checked. [2020-07-20 13:42:43,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:42:45,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:46,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:46,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:46,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:46,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:46,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:46,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:46,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:46,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:47,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:48,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:50,545 INFO L134 CoverageAnalysis]: Checked inductivity of 6109 backedges. 717 proven. 126 refuted. 0 times theorem prover too weak. 5266 trivial. 0 not checked. [2020-07-20 13:42:50,545 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1592987364] [2020-07-20 13:42:50,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:42:50,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:42:50,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391935170] [2020-07-20 13:42:50,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:42:50,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:42:50,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:42:50,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:42:50,547 INFO L87 Difference]: Start difference. First operand 263 states and 516 transitions. Second operand 15 states. [2020-07-20 13:42:51,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:42:51,172 INFO L93 Difference]: Finished difference Result 285 states and 541 transitions. [2020-07-20 13:42:51,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:42:51,173 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 464 [2020-07-20 13:42:51,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:42:51,177 INFO L225 Difference]: With dead ends: 285 [2020-07-20 13:42:51,177 INFO L226 Difference]: Without dead ends: 272 [2020-07-20 13:42:51,179 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 903 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:42:51,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2020-07-20 13:42:51,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 263. [2020-07-20 13:42:51,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 263 states. [2020-07-20 13:42:51,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 516 transitions. [2020-07-20 13:42:51,207 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 516 transitions. Word has length 464 [2020-07-20 13:42:51,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:42:51,207 INFO L479 AbstractCegarLoop]: Abstraction has 263 states and 516 transitions. [2020-07-20 13:42:51,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:42:51,207 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 516 transitions. [2020-07-20 13:42:51,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 13:42:51,213 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:42:51,213 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 27, 27, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 10, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:42:51,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:42:51,414 INFO L427 AbstractCegarLoop]: === Iteration 79 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:42:51,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:42:51,415 INFO L82 PathProgramCache]: Analyzing trace with hash 1823202450, now seen corresponding path program 62 times [2020-07-20 13:42:51,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:42:51,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [973049665] [2020-07-20 13:42:51,416 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 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:42:52,647 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:42:52,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:42:52,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 1083 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 13:42:52,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:42:53,033 INFO L134 CoverageAnalysis]: Checked inductivity of 6758 backedges. 852 proven. 257 refuted. 0 times theorem prover too weak. 5649 trivial. 0 not checked. [2020-07-20 13:42:53,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:42:56,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:56,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:58,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:58,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:58,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:58,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:59,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:59,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:59,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:59,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:00,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:03,048 INFO L134 CoverageAnalysis]: Checked inductivity of 6758 backedges. 850 proven. 275 refuted. 0 times theorem prover too weak. 5633 trivial. 0 not checked. [2020-07-20 13:43:03,048 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [973049665] [2020-07-20 13:43:03,048 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:43:03,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-20 13:43:03,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128568253] [2020-07-20 13:43:03,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:43:03,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:43:03,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:43:03,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:43:03,050 INFO L87 Difference]: Start difference. First operand 263 states and 516 transitions. Second operand 19 states. [2020-07-20 13:43:04,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:43:04,065 INFO L93 Difference]: Finished difference Result 290 states and 549 transitions. [2020-07-20 13:43:04,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:43:04,065 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 487 [2020-07-20 13:43:04,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:43:04,069 INFO L225 Difference]: With dead ends: 290 [2020-07-20 13:43:04,069 INFO L226 Difference]: Without dead ends: 275 [2020-07-20 13:43:04,071 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 943 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:43:04,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2020-07-20 13:43:04,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 258. [2020-07-20 13:43:04,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 258 states. [2020-07-20 13:43:04,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 499 transitions. [2020-07-20 13:43:04,097 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 499 transitions. Word has length 487 [2020-07-20 13:43:04,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:43:04,098 INFO L479 AbstractCegarLoop]: Abstraction has 258 states and 499 transitions. [2020-07-20 13:43:04,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:43:04,098 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 499 transitions. [2020-07-20 13:43:04,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 13:43:04,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:43:04,102 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 33, 33, 27, 27, 19, 19, 19, 19, 19, 19, 19, 16, 16, 16, 16, 16, 16, 16, 11, 11, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:43:04,302 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:43:04,303 INFO L427 AbstractCegarLoop]: === Iteration 80 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:43:04,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:43:04,304 INFO L82 PathProgramCache]: Analyzing trace with hash -1845830334, now seen corresponding path program 63 times [2020-07-20 13:43:04,304 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:43:04,304 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1379413353] [2020-07-20 13:43:04,305 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 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:43:05,478 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:43:05,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:43:05,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 1083 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 13:43:05,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:43:05,890 INFO L134 CoverageAnalysis]: Checked inductivity of 6790 backedges. 703 proven. 231 refuted. 0 times theorem prover too weak. 5856 trivial. 0 not checked. [2020-07-20 13:43:05,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:43:09,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:10,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:10,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:10,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:10,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:10,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:10,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:11,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:11,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:12,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:14,620 INFO L134 CoverageAnalysis]: Checked inductivity of 6790 backedges. 703 proven. 241 refuted. 0 times theorem prover too weak. 5846 trivial. 0 not checked. [2020-07-20 13:43:14,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1379413353] [2020-07-20 13:43:14,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:43:14,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-20 13:43:14,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674627681] [2020-07-20 13:43:14,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:43:14,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:43:14,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:43:14,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:43:14,622 INFO L87 Difference]: Start difference. First operand 258 states and 499 transitions. Second operand 17 states. [2020-07-20 13:43:15,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:43:15,424 INFO L93 Difference]: Finished difference Result 294 states and 538 transitions. [2020-07-20 13:43:15,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:43:15,425 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 487 [2020-07-20 13:43:15,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:43:15,429 INFO L225 Difference]: With dead ends: 294 [2020-07-20 13:43:15,429 INFO L226 Difference]: Without dead ends: 279 [2020-07-20 13:43:15,431 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 978 GetRequests, 947 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:43:15,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2020-07-20 13:43:15,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 255. [2020-07-20 13:43:15,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 255 states. [2020-07-20 13:43:15,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 493 transitions. [2020-07-20 13:43:15,458 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 493 transitions. Word has length 487 [2020-07-20 13:43:15,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:43:15,458 INFO L479 AbstractCegarLoop]: Abstraction has 255 states and 493 transitions. [2020-07-20 13:43:15,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:43:15,458 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 493 transitions. [2020-07-20 13:43:15,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 13:43:15,463 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:43:15,464 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 27, 27, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 10, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:43:15,664 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:43:15,665 INFO L427 AbstractCegarLoop]: === Iteration 81 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:43:15,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:43:15,665 INFO L82 PathProgramCache]: Analyzing trace with hash -1234056320, now seen corresponding path program 64 times [2020-07-20 13:43:15,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:43:15,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2001003841] [2020-07-20 13:43:15,666 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 82 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:43:16,855 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:43:16,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:43:16,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 1083 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 13:43:16,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:43:17,193 INFO L134 CoverageAnalysis]: Checked inductivity of 6758 backedges. 805 proven. 306 refuted. 0 times theorem prover too weak. 5647 trivial. 0 not checked. [2020-07-20 13:43:17,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:43:21,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:21,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:22,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:22,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:23,344 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 13:43:23,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:23,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:23,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:24,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:24,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:24,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:25,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:27,753 INFO L134 CoverageAnalysis]: Checked inductivity of 6758 backedges. 805 proven. 320 refuted. 0 times theorem prover too weak. 5633 trivial. 0 not checked. [2020-07-20 13:43:27,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2001003841] [2020-07-20 13:43:27,754 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:43:27,754 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-20 13:43:27,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304771737] [2020-07-20 13:43:27,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:43:27,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:43:27,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:43:27,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:43:27,756 INFO L87 Difference]: Start difference. First operand 255 states and 493 transitions. Second operand 19 states. [2020-07-20 13:43:28,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:43:28,844 INFO L93 Difference]: Finished difference Result 326 states and 611 transitions. [2020-07-20 13:43:28,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:43:28,849 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 487 [2020-07-20 13:43:28,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:43:28,856 INFO L225 Difference]: With dead ends: 326 [2020-07-20 13:43:28,856 INFO L226 Difference]: Without dead ends: 311 [2020-07-20 13:43:28,859 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 943 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:43:28,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2020-07-20 13:43:28,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 255. [2020-07-20 13:43:28,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 255 states. [2020-07-20 13:43:28,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 493 transitions. [2020-07-20 13:43:28,897 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 493 transitions. Word has length 487 [2020-07-20 13:43:28,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:43:28,897 INFO L479 AbstractCegarLoop]: Abstraction has 255 states and 493 transitions. [2020-07-20 13:43:28,897 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:43:28,897 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 493 transitions. [2020-07-20 13:43:28,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2020-07-20 13:43:28,903 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:43:28,903 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 33, 33, 28, 27, 18, 18, 18, 18, 18, 18, 18, 16, 16, 16, 16, 16, 16, 16, 11, 10, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:43:29,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:43:29,104 INFO L427 AbstractCegarLoop]: === Iteration 82 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:43:29,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:43:29,105 INFO L82 PathProgramCache]: Analyzing trace with hash -1297542707, now seen corresponding path program 65 times [2020-07-20 13:43:29,105 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:43:29,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [583507343] [2020-07-20 13:43:29,106 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 83 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:43:30,284 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:43:30,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:43:30,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 1058 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:43:30,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:43:30,625 INFO L134 CoverageAnalysis]: Checked inductivity of 6453 backedges. 842 proven. 343 refuted. 0 times theorem prover too weak. 5268 trivial. 0 not checked. [2020-07-20 13:43:30,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:43:35,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:35,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:36,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:36,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:37,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:37,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:38,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:38,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:38,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:38,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:38,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:38,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:39,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:42,366 INFO L134 CoverageAnalysis]: Checked inductivity of 6453 backedges. 846 proven. 363 refuted. 0 times theorem prover too weak. 5244 trivial. 0 not checked. [2020-07-20 13:43:42,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [583507343] [2020-07-20 13:43:42,367 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:43:42,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:43:42,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849727367] [2020-07-20 13:43:42,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:43:42,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:43:42,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:43:42,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:43:42,368 INFO L87 Difference]: Start difference. First operand 255 states and 493 transitions. Second operand 19 states. [2020-07-20 13:43:43,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:43:43,527 INFO L93 Difference]: Finished difference Result 353 states and 682 transitions. [2020-07-20 13:43:43,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:43:43,528 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 476 [2020-07-20 13:43:43,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:43:43,535 INFO L225 Difference]: With dead ends: 353 [2020-07-20 13:43:43,535 INFO L226 Difference]: Without dead ends: 338 [2020-07-20 13:43:43,538 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 958 GetRequests, 919 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:43:43,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2020-07-20 13:43:43,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 230. [2020-07-20 13:43:43,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 230 states. [2020-07-20 13:43:43,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 438 transitions. [2020-07-20 13:43:43,567 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 438 transitions. Word has length 476 [2020-07-20 13:43:43,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:43:43,568 INFO L479 AbstractCegarLoop]: Abstraction has 230 states and 438 transitions. [2020-07-20 13:43:43,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:43:43,568 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 438 transitions. [2020-07-20 13:43:43,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 476 [2020-07-20 13:43:43,572 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:43:43,572 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 33, 33, 27, 27, 18, 18, 18, 18, 18, 18, 18, 16, 16, 16, 16, 16, 16, 16, 11, 9, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:43:43,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:43:43,774 INFO L427 AbstractCegarLoop]: === Iteration 83 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:43:43,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:43:43,775 INFO L82 PathProgramCache]: Analyzing trace with hash -151584039, now seen corresponding path program 66 times [2020-07-20 13:43:43,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:43:43,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [616225658] [2020-07-20 13:43:43,776 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 84 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:43:44,990 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:43:44,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:43:44,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 1056 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 13:43:44,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:43:45,381 INFO L134 CoverageAnalysis]: Checked inductivity of 6426 backedges. 899 proven. 341 refuted. 0 times theorem prover too weak. 5186 trivial. 0 not checked. [2020-07-20 13:43:45,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:43:48,076 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:43:48,548 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 34 [2020-07-20 13:43:50,564 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 33 [2020-07-20 13:43:50,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:50,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:52,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:52,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:53,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:53,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:54,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:54,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:54,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:55,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:55,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:56,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:58,789 INFO L134 CoverageAnalysis]: Checked inductivity of 6426 backedges. 896 proven. 365 refuted. 0 times theorem prover too weak. 5165 trivial. 0 not checked. [2020-07-20 13:43:58,790 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [616225658] [2020-07-20 13:43:58,790 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:43:58,790 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 18] total 21 [2020-07-20 13:43:58,791 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323821334] [2020-07-20 13:43:58,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:43:58,791 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:43:58,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:43:58,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:43:58,791 INFO L87 Difference]: Start difference. First operand 230 states and 438 transitions. Second operand 21 states. [2020-07-20 13:44:00,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:44:00,230 INFO L93 Difference]: Finished difference Result 367 states and 710 transitions. [2020-07-20 13:44:00,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:44:00,230 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 475 [2020-07-20 13:44:00,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:44:00,240 INFO L225 Difference]: With dead ends: 367 [2020-07-20 13:44:00,240 INFO L226 Difference]: Without dead ends: 344 [2020-07-20 13:44:00,245 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 956 GetRequests, 915 SyntacticMatches, 15 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=161, Invalid=595, Unknown=0, NotChecked=0, Total=756 [2020-07-20 13:44:00,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2020-07-20 13:44:00,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 220. [2020-07-20 13:44:00,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2020-07-20 13:44:00,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 415 transitions. [2020-07-20 13:44:00,270 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 415 transitions. Word has length 475 [2020-07-20 13:44:00,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:44:00,271 INFO L479 AbstractCegarLoop]: Abstraction has 220 states and 415 transitions. [2020-07-20 13:44:00,271 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:44:00,271 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 415 transitions. [2020-07-20 13:44:00,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 476 [2020-07-20 13:44:00,276 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:44:00,276 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 27, 27, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 10, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:44:00,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:44:00,477 INFO L427 AbstractCegarLoop]: === Iteration 84 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:44:00,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:44:00,478 INFO L82 PathProgramCache]: Analyzing trace with hash -583811255, now seen corresponding path program 67 times [2020-07-20 13:44:00,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:44:00,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200915860] [2020-07-20 13:44:00,479 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 85 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:44:01,790 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:44:01,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:44:01,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 1056 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 13:44:01,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:44:02,186 INFO L134 CoverageAnalysis]: Checked inductivity of 6414 backedges. 787 proven. 292 refuted. 0 times theorem prover too weak. 5335 trivial. 0 not checked. [2020-07-20 13:44:02,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:44:06,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:06,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:07,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:07,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:08,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:08,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:09,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:09,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:09,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:10,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:13,078 INFO L134 CoverageAnalysis]: Checked inductivity of 6414 backedges. 787 proven. 308 refuted. 0 times theorem prover too weak. 5319 trivial. 0 not checked. [2020-07-20 13:44:13,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200915860] [2020-07-20 13:44:13,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:44:13,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-20 13:44:13,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191997618] [2020-07-20 13:44:13,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:44:13,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:44:13,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:44:13,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:44:13,080 INFO L87 Difference]: Start difference. First operand 220 states and 415 transitions. Second operand 19 states. [2020-07-20 13:44:14,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:44:14,068 INFO L93 Difference]: Finished difference Result 271 states and 513 transitions. [2020-07-20 13:44:14,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:44:14,073 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 475 [2020-07-20 13:44:14,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:44:14,078 INFO L225 Difference]: With dead ends: 271 [2020-07-20 13:44:14,078 INFO L226 Difference]: Without dead ends: 248 [2020-07-20 13:44:14,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 955 GetRequests, 919 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:44:14,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2020-07-20 13:44:14,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 192. [2020-07-20 13:44:14,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-20 13:44:14,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 356 transitions. [2020-07-20 13:44:14,098 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 356 transitions. Word has length 475 [2020-07-20 13:44:14,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:44:14,099 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 356 transitions. [2020-07-20 13:44:14,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:44:14,099 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 356 transitions. [2020-07-20 13:44:14,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 13:44:14,103 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:44:14,103 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 33, 33, 27, 27, 19, 19, 19, 19, 19, 19, 19, 16, 16, 16, 16, 16, 16, 16, 11, 11, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:44:14,303 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:44:14,304 INFO L427 AbstractCegarLoop]: === Iteration 85 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:44:14,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:44:14,306 INFO L82 PathProgramCache]: Analyzing trace with hash -1797879280, now seen corresponding path program 68 times [2020-07-20 13:44:14,307 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:44:14,307 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1734651900] [2020-07-20 13:44:14,307 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 86 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:44:15,545 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:44:15,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:44:15,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 1083 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 13:44:15,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:44:15,990 INFO L134 CoverageAnalysis]: Checked inductivity of 6790 backedges. 778 proven. 156 refuted. 0 times theorem prover too weak. 5856 trivial. 0 not checked. [2020-07-20 13:44:15,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:44:19,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:20,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:20,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:21,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:21,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:21,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:21,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:22,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:25,684 INFO L134 CoverageAnalysis]: Checked inductivity of 6790 backedges. 776 proven. 168 refuted. 0 times theorem prover too weak. 5846 trivial. 0 not checked. [2020-07-20 13:44:25,684 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1734651900] [2020-07-20 13:44:25,684 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:44:25,685 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-20 13:44:25,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181459780] [2020-07-20 13:44:25,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:44:25,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:44:25,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:44:25,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:44:25,686 INFO L87 Difference]: Start difference. First operand 192 states and 356 transitions. Second operand 17 states. [2020-07-20 13:44:26,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:44:26,599 INFO L93 Difference]: Finished difference Result 251 states and 466 transitions. [2020-07-20 13:44:26,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:44:26,599 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 487 [2020-07-20 13:44:26,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:44:26,604 INFO L225 Difference]: With dead ends: 251 [2020-07-20 13:44:26,604 INFO L226 Difference]: Without dead ends: 235 [2020-07-20 13:44:26,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 978 GetRequests, 947 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:44:26,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2020-07-20 13:44:26,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 189. [2020-07-20 13:44:26,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2020-07-20 13:44:26,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 353 transitions. [2020-07-20 13:44:26,626 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 353 transitions. Word has length 487 [2020-07-20 13:44:26,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:44:26,626 INFO L479 AbstractCegarLoop]: Abstraction has 189 states and 353 transitions. [2020-07-20 13:44:26,626 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:44:26,627 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 353 transitions. [2020-07-20 13:44:26,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 476 [2020-07-20 13:44:26,631 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:44:26,631 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 33, 33, 27, 27, 18, 18, 18, 18, 18, 18, 18, 16, 16, 16, 16, 16, 16, 16, 11, 9, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:44:26,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:44:26,832 INFO L427 AbstractCegarLoop]: === Iteration 86 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:44:26,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:44:26,834 INFO L82 PathProgramCache]: Analyzing trace with hash 516830041, now seen corresponding path program 69 times [2020-07-20 13:44:26,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:44:26,834 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1759354848] [2020-07-20 13:44:26,835 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 87 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:44:28,067 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:44:28,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:44:28,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 1056 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 13:44:28,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:44:28,441 INFO L134 CoverageAnalysis]: Checked inductivity of 6426 backedges. 785 proven. 125 refuted. 0 times theorem prover too weak. 5516 trivial. 0 not checked. [2020-07-20 13:44:28,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:44:31,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:32,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:32,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:33,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:33,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:33,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:33,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:35,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:38,071 INFO L134 CoverageAnalysis]: Checked inductivity of 6426 backedges. 783 proven. 137 refuted. 0 times theorem prover too weak. 5506 trivial. 0 not checked. [2020-07-20 13:44:38,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1759354848] [2020-07-20 13:44:38,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:44:38,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-20 13:44:38,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132188312] [2020-07-20 13:44:38,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:44:38,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:44:38,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:44:38,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:44:38,073 INFO L87 Difference]: Start difference. First operand 189 states and 353 transitions. Second operand 17 states. [2020-07-20 13:44:38,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:44:38,907 INFO L93 Difference]: Finished difference Result 199 states and 363 transitions. [2020-07-20 13:44:38,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:44:38,907 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 475 [2020-07-20 13:44:38,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:44:38,910 INFO L225 Difference]: With dead ends: 199 [2020-07-20 13:44:38,910 INFO L226 Difference]: Without dead ends: 186 [2020-07-20 13:44:38,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 954 GetRequests, 923 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:44:38,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2020-07-20 13:44:38,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 178. [2020-07-20 13:44:38,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2020-07-20 13:44:38,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 321 transitions. [2020-07-20 13:44:38,930 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 321 transitions. Word has length 475 [2020-07-20 13:44:38,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:44:38,931 INFO L479 AbstractCegarLoop]: Abstraction has 178 states and 321 transitions. [2020-07-20 13:44:38,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:44:38,931 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 321 transitions. [2020-07-20 13:44:38,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 476 [2020-07-20 13:44:38,935 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:44:38,936 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 27, 27, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 10, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:44:39,136 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:44:39,137 INFO L427 AbstractCegarLoop]: === Iteration 87 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:44:39,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:44:39,138 INFO L82 PathProgramCache]: Analyzing trace with hash -582108663, now seen corresponding path program 70 times [2020-07-20 13:44:39,138 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:44:39,138 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1103996166] [2020-07-20 13:44:39,139 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 88 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:44:40,320 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:44:40,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:44:40,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 1056 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 13:44:40,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:44:40,628 INFO L134 CoverageAnalysis]: Checked inductivity of 6414 backedges. 930 proven. 151 refuted. 0 times theorem prover too weak. 5333 trivial. 0 not checked. [2020-07-20 13:44:40,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:44:44,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:45,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:46,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:46,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:46,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:46,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:46,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:47,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:48,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:51,539 INFO L134 CoverageAnalysis]: Checked inductivity of 6414 backedges. 928 proven. 167 refuted. 0 times theorem prover too weak. 5319 trivial. 0 not checked. [2020-07-20 13:44:51,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1103996166] [2020-07-20 13:44:51,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:44:51,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-20 13:44:51,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881476854] [2020-07-20 13:44:51,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:44:51,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:44:51,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:44:51,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:44:51,541 INFO L87 Difference]: Start difference. First operand 178 states and 321 transitions. Second operand 19 states. [2020-07-20 13:44:52,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:44:52,566 INFO L93 Difference]: Finished difference Result 222 states and 399 transitions. [2020-07-20 13:44:52,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:44:52,567 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 475 [2020-07-20 13:44:52,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:44:52,571 INFO L225 Difference]: With dead ends: 222 [2020-07-20 13:44:52,571 INFO L226 Difference]: Without dead ends: 202 [2020-07-20 13:44:52,572 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 955 GetRequests, 919 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:44:52,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-20 13:44:52,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 137. [2020-07-20 13:44:52,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2020-07-20 13:44:52,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 240 transitions. [2020-07-20 13:44:52,586 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 240 transitions. Word has length 475 [2020-07-20 13:44:52,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:44:52,586 INFO L479 AbstractCegarLoop]: Abstraction has 137 states and 240 transitions. [2020-07-20 13:44:52,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:44:52,587 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 240 transitions. [2020-07-20 13:44:52,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 465 [2020-07-20 13:44:52,589 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:44:52,589 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 28, 27, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 12, 10, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:44:52,790 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:44:52,791 INFO L427 AbstractCegarLoop]: === Iteration 88 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:44:52,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:44:52,792 INFO L82 PathProgramCache]: Analyzing trace with hash -477489234, now seen corresponding path program 71 times [2020-07-20 13:44:52,792 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:44:52,792 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1625227011] [2020-07-20 13:44:52,793 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 89 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:44:54,105 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:44:54,105 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:44:54,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 840 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:44:54,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:44:54,595 INFO L134 CoverageAnalysis]: Checked inductivity of 6109 backedges. 228 proven. 1083 refuted. 0 times theorem prover too weak. 4798 trivial. 0 not checked. [2020-07-20 13:44:54,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:44:57,219 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:44:57,330 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 13:44:57,443 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:44:57,561 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:44:57,675 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:45:02,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:02,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:04,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:04,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:05,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:06,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:06,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:07,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:07,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:07,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:07,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:07,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:07,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:07,684 INFO L134 CoverageAnalysis]: Checked inductivity of 6109 backedges. 234 proven. 1110 refuted. 0 times theorem prover too weak. 4765 trivial. 0 not checked. [2020-07-20 13:45:07,684 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1625227011] [2020-07-20 13:45:07,684 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:45:07,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:45:07,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530367565] [2020-07-20 13:45:07,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:45:07,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:45:07,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:45:07,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:45:07,686 INFO L87 Difference]: Start difference. First operand 137 states and 240 transitions. Second operand 21 states. [2020-07-20 13:45:08,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:45:08,857 INFO L93 Difference]: Finished difference Result 236 states and 444 transitions. [2020-07-20 13:45:08,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:45:08,861 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 464 [2020-07-20 13:45:08,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:45:08,866 INFO L225 Difference]: With dead ends: 236 [2020-07-20 13:45:08,866 INFO L226 Difference]: Without dead ends: 134 [2020-07-20 13:45:08,869 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 935 GetRequests, 891 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:45:08,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2020-07-20 13:45:08,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2020-07-20 13:45:08,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-07-20 13:45:08,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 189 transitions. [2020-07-20 13:45:08,882 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 189 transitions. Word has length 464 [2020-07-20 13:45:08,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:45:08,882 INFO L479 AbstractCegarLoop]: Abstraction has 134 states and 189 transitions. [2020-07-20 13:45:08,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:45:08,882 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 189 transitions. [2020-07-20 13:45:08,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 476 [2020-07-20 13:45:08,885 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:45:08,885 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 33, 33, 27, 27, 18, 18, 18, 18, 18, 18, 18, 16, 16, 16, 16, 16, 16, 16, 11, 9, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:45:09,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:45:09,086 INFO L427 AbstractCegarLoop]: === Iteration 89 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:45:09,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:45:09,087 INFO L82 PathProgramCache]: Analyzing trace with hash 759223819, now seen corresponding path program 72 times [2020-07-20 13:45:09,087 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:45:09,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [376627559] [2020-07-20 13:45:09,088 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 90 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:45:10,349 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:45:10,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:45:10,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 862 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 13:45:10,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:45:10,714 INFO L134 CoverageAnalysis]: Checked inductivity of 6426 backedges. 258 proven. 982 refuted. 0 times theorem prover too weak. 5186 trivial. 0 not checked. [2020-07-20 13:45:10,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:45:11,068 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 13:45:13,243 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 39 [2020-07-20 13:45:16,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:18,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:18,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:19,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:20,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:20,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:20,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:20,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:20,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:20,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:20,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:21,150 INFO L134 CoverageAnalysis]: Checked inductivity of 6426 backedges. 259 proven. 1002 refuted. 0 times theorem prover too weak. 5165 trivial. 0 not checked. [2020-07-20 13:45:21,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [376627559] [2020-07-20 13:45:21,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:45:21,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 18] total 21 [2020-07-20 13:45:21,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483796279] [2020-07-20 13:45:21,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:45:21,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:45:21,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:45:21,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:45:21,152 INFO L87 Difference]: Start difference. First operand 134 states and 189 transitions. Second operand 21 states. [2020-07-20 13:45:22,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:45:22,267 INFO L93 Difference]: Finished difference Result 220 states and 301 transitions. [2020-07-20 13:45:22,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:45:22,272 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 475 [2020-07-20 13:45:22,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:45:22,276 INFO L225 Difference]: With dead ends: 220 [2020-07-20 13:45:22,276 INFO L226 Difference]: Without dead ends: 134 [2020-07-20 13:45:22,277 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 956 GetRequests, 915 SyntacticMatches, 15 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=161, Invalid=595, Unknown=0, NotChecked=0, Total=756 [2020-07-20 13:45:22,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2020-07-20 13:45:22,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 121. [2020-07-20 13:45:22,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-07-20 13:45:22,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 149 transitions. [2020-07-20 13:45:22,289 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 149 transitions. Word has length 475 [2020-07-20 13:45:22,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:45:22,289 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 149 transitions. [2020-07-20 13:45:22,289 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:45:22,290 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 149 transitions. [2020-07-20 13:45:22,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 476 [2020-07-20 13:45:22,291 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:45:22,292 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 27, 27, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 10, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:45:22,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:45:22,493 INFO L427 AbstractCegarLoop]: === Iteration 90 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:45:22,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:45:22,493 INFO L82 PathProgramCache]: Analyzing trace with hash -247769445, now seen corresponding path program 73 times [2020-07-20 13:45:22,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:45:22,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1096523554] [2020-07-20 13:45:22,494 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 91 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:45:23,761 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:45:23,761 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:45:23,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 862 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 13:45:23,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:45:24,152 INFO L134 CoverageAnalysis]: Checked inductivity of 6414 backedges. 258 proven. 1140 refuted. 0 times theorem prover too weak. 5016 trivial. 0 not checked. [2020-07-20 13:45:24,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:45:26,723 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 13:45:30,754 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 47 [2020-07-20 13:45:30,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:30,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:31,695 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 13:45:33,502 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 33 [2020-07-20 13:45:33,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:33,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:35,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:36,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:36,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:36,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:36,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:36,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:37,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:37,507 INFO L134 CoverageAnalysis]: Checked inductivity of 6414 backedges. 255 proven. 1173 refuted. 0 times theorem prover too weak. 4986 trivial. 0 not checked. [2020-07-20 13:45:37,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1096523554] [2020-07-20 13:45:37,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:45:37,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 20] total 23 [2020-07-20 13:45:37,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596017915] [2020-07-20 13:45:37,508 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:45:37,508 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:45:37,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:45:37,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:45:37,509 INFO L87 Difference]: Start difference. First operand 121 states and 149 transitions. Second operand 23 states. [2020-07-20 13:45:38,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:45:38,797 INFO L93 Difference]: Finished difference Result 203 states and 251 transitions. [2020-07-20 13:45:38,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:45:38,802 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 475 [2020-07-20 13:45:38,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:45:38,805 INFO L225 Difference]: With dead ends: 203 [2020-07-20 13:45:38,805 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 13:45:38,809 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 957 GetRequests, 911 SyntacticMatches, 17 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=190, Invalid=740, Unknown=0, NotChecked=0, Total=930 [2020-07-20 13:45:38,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 13:45:38,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 13:45:38,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 13:45:38,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 13:45:38,810 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 475 [2020-07-20 13:45:38,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:45:38,810 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 13:45:38,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:45:38,811 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 13:45:38,811 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 13:45:39,018 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 91 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:45:39,022 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 13:45:44,791 WARN L193 SmtUtils]: Spent 4.64 s on a formula simplification. DAG size of input: 566 DAG size of output: 197 [2020-07-20 13:45:47,510 WARN L193 SmtUtils]: Spent 2.72 s on a formula simplification. DAG size of input: 500 DAG size of output: 183 [2020-07-20 13:45:47,784 WARN L193 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 83 [2020-07-20 13:45:50,004 WARN L193 SmtUtils]: Spent 2.22 s on a formula simplification. DAG size of input: 479 DAG size of output: 171 [2020-07-20 13:45:59,245 WARN L193 SmtUtils]: Spent 9.24 s on a formula simplification. DAG size of input: 741 DAG size of output: 254 [2020-07-20 13:45:59,528 WARN L193 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 228 DAG size of output: 84 [2020-07-20 13:46:00,584 WARN L193 SmtUtils]: Spent 1.05 s on a formula simplification. DAG size of input: 355 DAG size of output: 134 [2020-07-20 13:46:03,292 WARN L193 SmtUtils]: Spent 2.70 s on a formula simplification. DAG size of input: 521 DAG size of output: 177 [2020-07-20 13:46:03,408 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 162 DAG size of output: 62 [2020-07-20 13:46:11,964 WARN L193 SmtUtils]: Spent 8.55 s on a formula simplification. DAG size of input: 732 DAG size of output: 254 [2020-07-20 13:46:15,126 WARN L193 SmtUtils]: Spent 3.13 s on a formula simplification. DAG size of input: 534 DAG size of output: 187 [2020-07-20 13:46:17,710 WARN L193 SmtUtils]: Spent 2.58 s on a formula simplification. DAG size of input: 500 DAG size of output: 183 [2020-07-20 13:46:20,492 WARN L193 SmtUtils]: Spent 2.78 s on a formula simplification. DAG size of input: 521 DAG size of output: 189 [2020-07-20 13:46:29,976 WARN L193 SmtUtils]: Spent 9.42 s on a formula simplification. DAG size of input: 768 DAG size of output: 244 [2020-07-20 13:46:31,378 WARN L193 SmtUtils]: Spent 1.37 s on a formula simplification. DAG size of input: 392 DAG size of output: 142 [2020-07-20 13:46:32,323 WARN L193 SmtUtils]: Spent 884.00 ms on a formula simplification. DAG size of input: 342 DAG size of output: 107 [2020-07-20 13:46:33,764 WARN L193 SmtUtils]: Spent 1.44 s on a formula simplification. DAG size of input: 393 DAG size of output: 142 [2020-07-20 13:46:42,689 WARN L193 SmtUtils]: Spent 8.92 s on a formula simplification. DAG size of input: 743 DAG size of output: 256 [2020-07-20 13:46:51,720 WARN L193 SmtUtils]: Spent 9.03 s on a formula simplification. DAG size of input: 736 DAG size of output: 256 [2020-07-20 13:47:00,735 WARN L193 SmtUtils]: Spent 9.01 s on a formula simplification. DAG size of input: 733 DAG size of output: 253 [2020-07-20 13:47:09,864 WARN L193 SmtUtils]: Spent 9.13 s on a formula simplification. DAG size of input: 731 DAG size of output: 253 [2020-07-20 13:47:13,179 WARN L193 SmtUtils]: Spent 3.31 s on a formula simplification. DAG size of input: 555 DAG size of output: 201 [2020-07-20 13:47:15,786 WARN L193 SmtUtils]: Spent 2.60 s on a formula simplification. DAG size of input: 488 DAG size of output: 179 [2020-07-20 13:47:16,276 WARN L193 SmtUtils]: Spent 432.00 ms on a formula simplification. DAG size of input: 258 DAG size of output: 97 [2020-07-20 13:47:20,017 WARN L193 SmtUtils]: Spent 3.74 s on a formula simplification. DAG size of input: 582 DAG size of output: 199 [2020-07-20 13:47:20,516 WARN L193 SmtUtils]: Spent 496.00 ms on a formula simplification. DAG size of input: 279 DAG size of output: 87 [2020-07-20 13:47:23,654 WARN L193 SmtUtils]: Spent 3.13 s on a formula simplification. DAG size of input: 535 DAG size of output: 188 [2020-07-20 13:47:25,084 WARN L193 SmtUtils]: Spent 1.43 s on a formula simplification. DAG size of input: 393 DAG size of output: 142 [2020-07-20 13:47:27,758 WARN L193 SmtUtils]: Spent 2.67 s on a formula simplification. DAG size of input: 526 DAG size of output: 178 [2020-07-20 13:47:30,420 WARN L193 SmtUtils]: Spent 2.63 s on a formula simplification. DAG size of input: 508 DAG size of output: 187 [2020-07-20 13:47:39,355 WARN L193 SmtUtils]: Spent 8.93 s on a formula simplification. DAG size of input: 723 DAG size of output: 254 [2020-07-20 13:47:40,727 WARN L193 SmtUtils]: Spent 1.37 s on a formula simplification. DAG size of input: 392 DAG size of output: 142 [2020-07-20 13:47:48,902 WARN L193 SmtUtils]: Spent 8.11 s on a formula simplification. DAG size of input: 727 DAG size of output: 249 [2020-07-20 13:47:52,713 WARN L193 SmtUtils]: Spent 3.81 s on a formula simplification. DAG size of input: 590 DAG size of output: 205 [2020-07-20 13:48:02,014 WARN L193 SmtUtils]: Spent 9.30 s on a formula simplification. DAG size of input: 768 DAG size of output: 244 [2020-07-20 13:48:04,613 WARN L193 SmtUtils]: Spent 2.59 s on a formula simplification. DAG size of input: 522 DAG size of output: 178