/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_20-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:45:49,723 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:45:49,725 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:45:49,737 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:45:49,738 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:45:49,739 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:45:49,740 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:45:49,742 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:45:49,744 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:45:49,745 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:45:49,746 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:45:49,747 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:45:49,747 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:45:49,748 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:45:49,749 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:45:49,750 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:45:49,751 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:45:49,752 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:45:49,754 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:45:49,756 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:45:49,757 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:45:49,759 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:45:49,760 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:45:49,761 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:45:49,763 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:45:49,771 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:45:49,772 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:45:49,772 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:45:49,773 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 16:45:49,787 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:45:49,788 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:45:49,789 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:45:49,789 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:45:49,789 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:45:49,790 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:45:49,790 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:45:49,790 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:45:49,790 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:45:49,790 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:45:49,791 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:45:49,791 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:45:49,791 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:45:49,791 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:45:49,791 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:45:49,792 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:45:49,792 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:45:49,792 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:45:49,792 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:45:49,792 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:45:49,793 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:45:49,793 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:45:49,793 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:45:49,793 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:45:49,793 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:45:49,793 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:45:49,794 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:45:49,794 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:45:49,794 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:45:49,794 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:45:50,079 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:45:50,092 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:45:50,097 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:45:50,099 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:45:50,099 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:45:50,100 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_20-2.c [2020-07-20 16:45:50,181 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dde0bc915/db910ccaa7854d67952acc3b12cb6263/FLAG3add39bbb [2020-07-20 16:45:50,645 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:45:50,646 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_20-2.c [2020-07-20 16:45:50,652 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dde0bc915/db910ccaa7854d67952acc3b12cb6263/FLAG3add39bbb [2020-07-20 16:45:51,024 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dde0bc915/db910ccaa7854d67952acc3b12cb6263 [2020-07-20 16:45:51,034 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:45:51,037 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:45:51,038 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:45:51,038 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:45:51,041 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:45:51,043 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:45:51" (1/1) ... [2020-07-20 16:45:51,045 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18f0dfff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:45:51, skipping insertion in model container [2020-07-20 16:45:51,046 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:45:51" (1/1) ... [2020-07-20 16:45:51,053 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:45:51,070 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:45:51,253 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:45:51,258 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:45:51,276 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:45:51,291 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:45:51,292 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:45:51 WrapperNode [2020-07-20 16:45:51,292 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:45:51,293 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:45:51,293 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:45:51,293 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:45:51,311 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:45:51" (1/1) ... [2020-07-20 16:45:51,312 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:45:51" (1/1) ... [2020-07-20 16:45:51,318 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:45:51" (1/1) ... [2020-07-20 16:45:51,319 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:45:51" (1/1) ... [2020-07-20 16:45:51,417 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:45:51" (1/1) ... [2020-07-20 16:45:51,419 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:45:51" (1/1) ... [2020-07-20 16:45:51,420 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:45:51" (1/1) ... [2020-07-20 16:45:51,422 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:45:51,423 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:45:51,423 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:45:51,423 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:45:51,424 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:45:51" (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 16:45:51,502 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:45:51,503 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:45:51,503 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 16:45:51,504 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 16:45:51,504 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:45:51,504 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:45:51,505 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:45:51,505 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 16:45:51,505 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 16:45:51,505 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:45:51,506 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:45:51,506 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:45:51,816 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:45:51,816 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:45:51,820 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:45:51 BoogieIcfgContainer [2020-07-20 16:45:51,821 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:45:51,822 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:45:51,822 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:45:51,825 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:45:51,825 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:45:51" (1/3) ... [2020-07-20 16:45:51,826 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9332335 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:45:51, skipping insertion in model container [2020-07-20 16:45:51,827 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:45:51" (2/3) ... [2020-07-20 16:45:51,827 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9332335 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:45:51, skipping insertion in model container [2020-07-20 16:45:51,827 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:45:51" (3/3) ... [2020-07-20 16:45:51,829 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_20-2.c [2020-07-20 16:45:51,840 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:45:51,847 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:45:51,861 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:45:51,886 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:45:51,887 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:45:51,887 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:45:51,887 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:45:51,887 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:45:51,887 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:45:51,887 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:45:51,888 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:45:51,907 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 16:45:51,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:45:51,913 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:45:51,915 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:45:51,915 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:45:51,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:45:51,921 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 16:45:51,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:45:51,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [411216886] [2020-07-20 16:45:51,930 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 16:45:51,996 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:45:51,996 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:45:51,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:45:52,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:45:52,093 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 16:45:52,093 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:45:52,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [411216886] [2020-07-20 16:45:52,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:45:52,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:45:52,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574928533] [2020-07-20 16:45:52,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:45:52,102 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:45:52,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:45:52,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:45:52,119 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 16:45:52,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:45:52,237 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 16:45:52,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:45:52,240 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:45:52,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:45:52,251 INFO L225 Difference]: With dead ends: 44 [2020-07-20 16:45:52,252 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 16:45:52,257 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 16:45:52,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 16:45:52,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 16:45:52,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:45:52,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:45:52,305 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 16:45:52,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:45:52,306 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:45:52,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:45:52,306 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:45:52,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 16:45:52,308 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:45:52,308 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:45:52,523 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:45:52,523 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:45:52,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:45:52,525 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 16:45:52,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:45:52,526 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1031317492] [2020-07-20 16:45:52,526 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 16:45:52,550 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:45:52,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:45:52,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:45:52,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:45:52,585 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 16:45:52,586 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:45:52,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1031317492] [2020-07-20 16:45:52,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:45:52,587 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:45:52,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631787074] [2020-07-20 16:45:52,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:45:52,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:45:52,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:45:52,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:45:52,590 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 16:45:52,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:45:52,654 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 16:45:52,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:45:52,655 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 16:45:52,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:45:52,657 INFO L225 Difference]: With dead ends: 36 [2020-07-20 16:45:52,657 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 16:45:52,658 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 16:45:52,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 16:45:52,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 16:45:52,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:45:52,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:45:52,668 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 16:45:52,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:45:52,669 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:45:52,669 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:45:52,669 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:45:52,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 16:45:52,671 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:45:52,671 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 16:45:52,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:45:52,885 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:45:52,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:45:52,886 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 16:45:52,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:45:52,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [520831173] [2020-07-20 16:45:52,888 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 16:45:52,929 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:45:52,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:45:52,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:45:52,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:45:52,986 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 16:45:52,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:45:53,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:53,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:53,208 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 16:45:53,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [520831173] [2020-07-20 16:45:53,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:45:53,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:45:53,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761348271] [2020-07-20 16:45:53,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:45:53,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:45:53,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:45:53,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:45:53,214 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 16:45:53,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:45:53,342 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 16:45:53,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:45:53,343 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 16:45:53,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:45:53,345 INFO L225 Difference]: With dead ends: 41 [2020-07-20 16:45:53,345 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 16:45:53,346 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 16:45:53,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 16:45:53,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 16:45:53,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:45:53,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:45:53,359 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 16:45:53,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:45:53,365 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:45:53,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:45:53,365 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:45:53,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 16:45:53,367 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:45:53,367 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 16:45:53,573 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:45:53,574 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:45:53,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:45:53,575 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 16:45:53,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:45:53,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924511363] [2020-07-20 16:45:53,577 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 16:45:53,626 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:45:53,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:45:53,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:45:53,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:45:53,688 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 16:45:53,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:45:53,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:53,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:53,860 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 16:45:53,861 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924511363] [2020-07-20 16:45:53,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:45:53,861 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:45:53,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186203589] [2020-07-20 16:45:53,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:45:53,862 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:45:53,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:45:53,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:45:53,865 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 16:45:53,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:45:53,995 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 16:45:53,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:45:53,995 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 16:45:53,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:45:53,998 INFO L225 Difference]: With dead ends: 46 [2020-07-20 16:45:53,998 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 16:45:53,998 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 16:45:53,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 16:45:54,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 16:45:54,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:45:54,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:45:54,008 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 16:45:54,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:45:54,008 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:45:54,008 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:45:54,009 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:45:54,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 16:45:54,010 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:45:54,011 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 16:45:54,225 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:45:54,226 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:45:54,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:45:54,226 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 16:45:54,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:45:54,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [842629079] [2020-07-20 16:45:54,228 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 16:45:54,264 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:45:54,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:45:54,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:45:54,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:45:54,325 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 16:45:54,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:45:54,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:54,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:54,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:54,688 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 16:45:54,689 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [842629079] [2020-07-20 16:45:54,689 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:45:54,689 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:45:54,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525797173] [2020-07-20 16:45:54,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:45:54,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:45:54,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:45:54,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:45:54,691 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 16:45:54,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:45:54,873 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 16:45:54,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:45:54,873 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 16:45:54,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:45:54,877 INFO L225 Difference]: With dead ends: 51 [2020-07-20 16:45:54,878 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 16:45:54,881 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 16:45:54,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 16:45:54,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 16:45:54,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 16:45:54,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 16:45:54,894 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 16:45:54,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:45:54,894 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 16:45:54,894 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:45:54,894 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 16:45:54,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 16:45:54,896 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:45:54,896 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 16:45:55,101 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:45:55,103 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:45:55,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:45:55,104 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 16:45:55,105 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:45:55,105 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1212811815] [2020-07-20 16:45:55,106 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 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 16:45:55,142 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:45:55,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:45:55,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:45:55,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:45:55,207 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:45:55,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:45:55,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:55,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:55,503 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:45:55,504 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1212811815] [2020-07-20 16:45:55,504 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:45:55,504 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:45:55,505 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890284320] [2020-07-20 16:45:55,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:45:55,505 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:45:55,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:45:55,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:45:55,506 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 16:45:55,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:45:55,779 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-20 16:45:55,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:45:55,779 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 16:45:55,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:45:55,786 INFO L225 Difference]: With dead ends: 84 [2020-07-20 16:45:55,787 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 16:45:55,791 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:45:55,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 16:45:55,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-20 16:45:55,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 16:45:55,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-20 16:45:55,810 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-20 16:45:55,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:45:55,811 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-20 16:45:55,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:45:55,811 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-20 16:45:55,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 16:45:55,814 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:45:55,815 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 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 16:45:56,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:45:56,030 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:45:56,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:45:56,031 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-20 16:45:56,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:45:56,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1946604326] [2020-07-20 16:45:56,032 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 16:45:56,072 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:45:56,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:45:56,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:45:56,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:45:56,130 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 16:45:56,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:45:56,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:56,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:56,443 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:45:56,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1946604326] [2020-07-20 16:45:56,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:45:56,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:45:56,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347242860] [2020-07-20 16:45:56,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:45:56,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:45:56,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:45:56,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:45:56,446 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-20 16:45:56,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:45:56,609 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-20 16:45:56,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:45:56,609 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-20 16:45:56,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:45:56,611 INFO L225 Difference]: With dead ends: 63 [2020-07-20 16:45:56,612 INFO L226 Difference]: Without dead ends: 59 [2020-07-20 16:45:56,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 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 16:45:56,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-20 16:45:56,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-20 16:45:56,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 16:45:56,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-20 16:45:56,636 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-20 16:45:56,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:45:56,637 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-20 16:45:56,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:45:56,637 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-20 16:45:56,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-20 16:45:56,640 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:45:56,640 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 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 16:45:56,842 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:45:56,843 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:45:56,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:45:56,844 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-20 16:45:56,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:45:56,845 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [348364626] [2020-07-20 16:45:56,845 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 16:45:56,886 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:45:56,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:45:56,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:45:56,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:45:56,939 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:45:56,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:45:57,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:57,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:57,160 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:45:57,160 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [348364626] [2020-07-20 16:45:57,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:45:57,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:45:57,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179779897] [2020-07-20 16:45:57,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:45:57,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:45:57,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:45:57,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:45:57,163 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-20 16:45:57,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:45:57,283 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-20 16:45:57,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:45:57,288 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-20 16:45:57,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:45:57,290 INFO L225 Difference]: With dead ends: 65 [2020-07-20 16:45:57,290 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 16:45:57,291 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 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 16:45:57,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 16:45:57,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-20 16:45:57,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 16:45:57,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-20 16:45:57,303 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-20 16:45:57,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:45:57,304 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-20 16:45:57,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:45:57,304 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-20 16:45:57,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 16:45:57,307 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:45:57,307 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:45:57,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:45:57,521 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:45:57,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:45:57,522 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-20 16:45:57,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:45:57,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1522053224] [2020-07-20 16:45:57,524 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 16:45:57,571 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:45:57,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:45:57,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:45:57,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:45:57,636 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 16:45:57,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:45:58,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:58,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:58,093 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:58,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:58,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:58,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:58,186 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-20 16:45:58,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1522053224] [2020-07-20 16:45:58,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:45:58,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:45:58,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103571206] [2020-07-20 16:45:58,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:45:58,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:45:58,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:45:58,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:45:58,189 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-20 16:45:58,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:45:58,390 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-20 16:45:58,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:45:58,390 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-20 16:45:58,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:45:58,393 INFO L225 Difference]: With dead ends: 75 [2020-07-20 16:45:58,393 INFO L226 Difference]: Without dead ends: 71 [2020-07-20 16:45:58,394 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:45:58,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-20 16:45:58,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-20 16:45:58,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 16:45:58,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-20 16:45:58,421 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-20 16:45:58,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:45:58,422 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-20 16:45:58,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:45:58,422 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-20 16:45:58,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 16:45:58,426 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:45:58,427 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:45:58,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:45:58,628 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:45:58,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:45:58,628 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-20 16:45:58,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:45:58,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [523464226] [2020-07-20 16:45:58,630 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 16:45:58,680 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:45:58,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:45:58,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:45:58,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:45:58,746 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 16:45:58,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:45:59,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:59,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:45:59,120 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 16:45:59,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [523464226] [2020-07-20 16:45:59,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:45:59,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:45:59,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675881431] [2020-07-20 16:45:59,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:45:59,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:45:59,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:45:59,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:45:59,123 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-20 16:45:59,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:45:59,327 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-20 16:45:59,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:45:59,327 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-20 16:45:59,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:45:59,329 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:45:59,330 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:45:59,332 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:45:59,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:45:59,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-20 16:45:59,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:45:59,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-20 16:45:59,349 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-20 16:45:59,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:45:59,350 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-20 16:45:59,350 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:45:59,350 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-20 16:45:59,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:45:59,354 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:45:59,355 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:45:59,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:45:59,556 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:45:59,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:45:59,557 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-20 16:45:59,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:45:59,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [574914958] [2020-07-20 16:45:59,558 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 16:45:59,604 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:45:59,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:45:59,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:45:59,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:45:59,709 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 16:45:59,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:00,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:00,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:00,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:00,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:00,333 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-20 16:46:00,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [574914958] [2020-07-20 16:46:00,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:00,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:46:00,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027580282] [2020-07-20 16:46:00,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:46:00,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:00,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:46:00,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:46:00,336 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-20 16:46:00,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:00,747 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-20 16:46:00,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:46:00,748 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-20 16:46:00,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:00,751 INFO L225 Difference]: With dead ends: 131 [2020-07-20 16:46:00,751 INFO L226 Difference]: Without dead ends: 76 [2020-07-20 16:46:00,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:46:00,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-20 16:46:00,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-20 16:46:00,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-20 16:46:00,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-20 16:46:00,762 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-20 16:46:00,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:00,763 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-20 16:46:00,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:46:00,763 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-20 16:46:00,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-20 16:46:00,765 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:00,775 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:00,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:00,981 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:00,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:00,982 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-20 16:46:00,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:00,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [554014308] [2020-07-20 16:46:00,983 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 16:46:01,030 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:46:01,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:01,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:46:01,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:01,148 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 16:46:01,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:01,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:01,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:01,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:01,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:01,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:01,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:01,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:01,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:01,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:02,017 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-20 16:46:02,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [554014308] [2020-07-20 16:46:02,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:02,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:46:02,018 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725034705] [2020-07-20 16:46:02,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:46:02,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:02,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:46:02,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:46:02,019 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-20 16:46:02,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:02,856 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-20 16:46:02,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 16:46:02,857 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-20 16:46:02,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:02,861 INFO L225 Difference]: With dead ends: 186 [2020-07-20 16:46:02,861 INFO L226 Difference]: Without dead ends: 124 [2020-07-20 16:46:02,864 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 145 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 16:46:02,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-20 16:46:02,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-20 16:46:02,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-20 16:46:02,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-20 16:46:02,881 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-20 16:46:02,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:02,882 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-20 16:46:02,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:46:02,882 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-20 16:46:02,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:46:02,883 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:02,884 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:03,096 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:03,097 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:03,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:03,098 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-20 16:46:03,098 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:03,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [95553996] [2020-07-20 16:46:03,099 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 16:46:03,158 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:46:03,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:03,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:46:03,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:03,220 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-20 16:46:03,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:03,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:03,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:03,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:03,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:03,775 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 16:46:03,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [95553996] [2020-07-20 16:46:03,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:03,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:46:03,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097752543] [2020-07-20 16:46:03,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:46:03,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:03,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:46:03,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:46:03,777 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 14 states. [2020-07-20 16:46:03,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:03,968 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-20 16:46:03,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:46:03,968 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2020-07-20 16:46:03,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:03,970 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:46:03,970 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 16:46:03,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:46:03,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 16:46:03,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-20 16:46:03,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-20 16:46:03,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-20 16:46:03,984 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-20 16:46:03,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:03,984 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-20 16:46:03,984 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:46:03,985 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-20 16:46:03,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-20 16:46:03,986 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:03,986 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:04,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:04,192 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:04,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:04,193 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-20 16:46:04,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:04,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931826009] [2020-07-20 16:46:04,194 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 16:46:04,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:46:04,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:04,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:46:04,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:04,342 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-07-20 16:46:04,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:04,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:04,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:04,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:04,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:04,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:05,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:05,092 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2020-07-20 16:46:05,093 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931826009] [2020-07-20 16:46:05,093 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:05,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-20 16:46:05,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478264824] [2020-07-20 16:46:05,094 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:46:05,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:05,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:46:05,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:46:05,095 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-20 16:46:05,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:05,602 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-20 16:46:05,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:46:05,602 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-20 16:46:05,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:05,606 INFO L225 Difference]: With dead ends: 269 [2020-07-20 16:46:05,606 INFO L226 Difference]: Without dead ends: 168 [2020-07-20 16:46:05,609 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 162 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:46:05,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-20 16:46:05,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-20 16:46:05,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 16:46:05,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-20 16:46:05,645 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-20 16:46:05,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:05,646 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-20 16:46:05,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:46:05,647 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-20 16:46:05,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-20 16:46:05,650 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:05,651 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 3, 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 16:46:05,865 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:05,866 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:05,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:05,867 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-20 16:46:05,867 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:05,867 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1484294541] [2020-07-20 16:46:05,868 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 16:46:05,935 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:46:05,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:05,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:46:05,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:05,975 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-20 16:46:05,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:06,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:06,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:06,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:06,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:06,365 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-20 16:46:06,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1484294541] [2020-07-20 16:46:06,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:06,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:46:06,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816694258] [2020-07-20 16:46:06,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:46:06,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:06,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:46:06,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:46:06,368 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 12 states. [2020-07-20 16:46:06,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:06,556 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-20 16:46:06,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:46:06,557 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 80 [2020-07-20 16:46:06,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:06,561 INFO L225 Difference]: With dead ends: 167 [2020-07-20 16:46:06,561 INFO L226 Difference]: Without dead ends: 163 [2020-07-20 16:46:06,565 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 144 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 16:46:06,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-20 16:46:06,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-20 16:46:06,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-20 16:46:06,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-20 16:46:06,584 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-20 16:46:06,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:06,584 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-20 16:46:06,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:46:06,585 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-20 16:46:06,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:46:06,589 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:06,589 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:06,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:06,805 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:06,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:06,805 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-20 16:46:06,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:06,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1916853384] [2020-07-20 16:46:06,806 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 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 16:46:06,877 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:46:06,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:06,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:46:06,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:06,986 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2020-07-20 16:46:06,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:07,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:07,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:07,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:08,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:08,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:08,211 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-20 16:46:08,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1916853384] [2020-07-20 16:46:08,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:08,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-20 16:46:08,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608182928] [2020-07-20 16:46:08,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:46:08,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:08,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:46:08,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:46:08,214 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-20 16:46:08,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:08,764 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-20 16:46:08,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:46:08,765 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-20 16:46:08,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:08,769 INFO L225 Difference]: With dead ends: 369 [2020-07-20 16:46:08,769 INFO L226 Difference]: Without dead ends: 218 [2020-07-20 16:46:08,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:46:08,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-20 16:46:08,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-20 16:46:08,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 16:46:08,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-20 16:46:08,791 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-20 16:46:08,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:08,791 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-20 16:46:08,792 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:46:08,792 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-20 16:46:08,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-20 16:46:08,795 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:08,795 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:09,009 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:09,009 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:09,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:09,010 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-20 16:46:09,010 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:09,011 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2066828762] [2020-07-20 16:46:09,011 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 16:46:09,088 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:46:09,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:09,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:46:09,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:09,143 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-20 16:46:09,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:09,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:09,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:09,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:09,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:09,546 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-20 16:46:09,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2066828762] [2020-07-20 16:46:09,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:09,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:46:09,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444293162] [2020-07-20 16:46:09,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:46:09,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:09,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:46:09,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:46:09,548 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 12 states. [2020-07-20 16:46:09,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:09,693 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-20 16:46:09,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:46:09,694 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 92 [2020-07-20 16:46:09,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:09,697 INFO L225 Difference]: With dead ends: 191 [2020-07-20 16:46:09,697 INFO L226 Difference]: Without dead ends: 187 [2020-07-20 16:46:09,698 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 169 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 16:46:09,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-20 16:46:09,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-20 16:46:09,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 16:46:09,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-20 16:46:09,714 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-20 16:46:09,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:09,714 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-20 16:46:09,714 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:46:09,714 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-20 16:46:09,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-07-20 16:46:09,717 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:09,717 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:09,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:09,932 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:09,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:09,932 INFO L82 PathProgramCache]: Analyzing trace with hash 1156827333, now seen corresponding path program 2 times [2020-07-20 16:46:09,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:09,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1098167169] [2020-07-20 16:46:09,933 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 16:46:10,012 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:46:10,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:10,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:46:10,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:10,131 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 84 proven. 110 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2020-07-20 16:46:10,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:10,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:10,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:10,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:11,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:11,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:11,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:11,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:11,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:11,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:11,402 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 84 proven. 116 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2020-07-20 16:46:11,402 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1098167169] [2020-07-20 16:46:11,402 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:11,402 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 23 [2020-07-20 16:46:11,403 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621612649] [2020-07-20 16:46:11,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:46:11,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:11,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:46:11,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:46:11,404 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 23 states. [2020-07-20 16:46:12,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:12,157 INFO L93 Difference]: Finished difference Result 393 states and 799 transitions. [2020-07-20 16:46:12,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 16:46:12,158 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 118 [2020-07-20 16:46:12,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:12,162 INFO L225 Difference]: With dead ends: 393 [2020-07-20 16:46:12,162 INFO L226 Difference]: Without dead ends: 222 [2020-07-20 16:46:12,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 207 SyntacticMatches, 13 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=261, Invalid=1221, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 16:46:12,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2020-07-20 16:46:12,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 183. [2020-07-20 16:46:12,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2020-07-20 16:46:12,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 321 transitions. [2020-07-20 16:46:12,183 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 321 transitions. Word has length 118 [2020-07-20 16:46:12,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:12,184 INFO L479 AbstractCegarLoop]: Abstraction has 183 states and 321 transitions. [2020-07-20 16:46:12,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:46:12,184 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 321 transitions. [2020-07-20 16:46:12,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 16:46:12,187 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:12,187 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:12,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:12,403 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:12,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:12,404 INFO L82 PathProgramCache]: Analyzing trace with hash -1258440967, now seen corresponding path program 3 times [2020-07-20 16:46:12,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:12,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1103045237] [2020-07-20 16:46:12,405 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 16:46:12,492 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:46:12,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:12,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:46:12,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:12,551 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-20 16:46:12,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:13,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:13,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:13,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:13,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:13,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:13,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:13,549 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 125 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-20 16:46:13,549 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1103045237] [2020-07-20 16:46:13,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:13,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:46:13,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [655815933] [2020-07-20 16:46:13,550 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:46:13,550 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:13,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:46:13,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:46:13,551 INFO L87 Difference]: Start difference. First operand 183 states and 321 transitions. Second operand 16 states. [2020-07-20 16:46:13,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:13,751 INFO L93 Difference]: Finished difference Result 203 states and 360 transitions. [2020-07-20 16:46:13,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:46:13,752 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 117 [2020-07-20 16:46:13,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:13,755 INFO L225 Difference]: With dead ends: 203 [2020-07-20 16:46:13,756 INFO L226 Difference]: Without dead ends: 199 [2020-07-20 16:46:13,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 211 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 16:46:13,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2020-07-20 16:46:13,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 188. [2020-07-20 16:46:13,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-20 16:46:13,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 333 transitions. [2020-07-20 16:46:13,772 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 333 transitions. Word has length 117 [2020-07-20 16:46:13,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:13,772 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 333 transitions. [2020-07-20 16:46:13,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:46:13,772 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 333 transitions. [2020-07-20 16:46:13,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-20 16:46:13,775 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:13,775 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:13,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:13,990 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:13,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:13,991 INFO L82 PathProgramCache]: Analyzing trace with hash -650257977, now seen corresponding path program 5 times [2020-07-20 16:46:13,991 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:13,992 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1306413226] [2020-07-20 16:46:13,992 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:46:14,087 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:46:14,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:14,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:46:14,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:14,188 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 210 proven. 31 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 16:46:14,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:14,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:14,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:15,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:15,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:15,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:15,142 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 51 proven. 126 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2020-07-20 16:46:15,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1306413226] [2020-07-20 16:46:15,143 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:15,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:46:15,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675091563] [2020-07-20 16:46:15,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:46:15,144 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:15,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:46:15,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:46:15,144 INFO L87 Difference]: Start difference. First operand 188 states and 333 transitions. Second operand 17 states. [2020-07-20 16:46:15,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:15,566 INFO L93 Difference]: Finished difference Result 374 states and 685 transitions. [2020-07-20 16:46:15,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:46:15,567 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 120 [2020-07-20 16:46:15,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:15,571 INFO L225 Difference]: With dead ends: 374 [2020-07-20 16:46:15,571 INFO L226 Difference]: Without dead ends: 192 [2020-07-20 16:46:15,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 214 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:46:15,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2020-07-20 16:46:15,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2020-07-20 16:46:15,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-20 16:46:15,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 327 transitions. [2020-07-20 16:46:15,591 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 327 transitions. Word has length 120 [2020-07-20 16:46:15,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:15,592 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 327 transitions. [2020-07-20 16:46:15,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:46:15,592 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 327 transitions. [2020-07-20 16:46:15,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-20 16:46:15,595 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:15,595 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:15,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:15,810 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:15,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:15,811 INFO L82 PathProgramCache]: Analyzing trace with hash 594466134, now seen corresponding path program 6 times [2020-07-20 16:46:15,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:15,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [582723298] [2020-07-20 16:46:15,812 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 16:46:15,954 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:46:15,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:15,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:46:15,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:16,072 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 73 proven. 91 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-20 16:46:16,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:16,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:16,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:17,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:17,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:17,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:17,264 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 73 proven. 97 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2020-07-20 16:46:17,264 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [582723298] [2020-07-20 16:46:17,265 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:17,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-20 16:46:17,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763822723] [2020-07-20 16:46:17,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:46:17,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:17,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:46:17,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-20 16:46:17,267 INFO L87 Difference]: Start difference. First operand 190 states and 327 transitions. Second operand 21 states. [2020-07-20 16:46:17,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:17,849 INFO L93 Difference]: Finished difference Result 387 states and 724 transitions. [2020-07-20 16:46:17,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 16:46:17,850 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 107 [2020-07-20 16:46:17,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:17,853 INFO L225 Difference]: With dead ends: 387 [2020-07-20 16:46:17,853 INFO L226 Difference]: Without dead ends: 201 [2020-07-20 16:46:17,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 185 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=186, Invalid=870, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:46:17,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-07-20 16:46:17,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 180. [2020-07-20 16:46:17,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2020-07-20 16:46:17,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 284 transitions. [2020-07-20 16:46:17,873 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 284 transitions. Word has length 107 [2020-07-20 16:46:17,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:17,874 INFO L479 AbstractCegarLoop]: Abstraction has 180 states and 284 transitions. [2020-07-20 16:46:17,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:46:17,874 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 284 transitions. [2020-07-20 16:46:17,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 16:46:17,877 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:17,877 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:18,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:18,091 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:18,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:18,092 INFO L82 PathProgramCache]: Analyzing trace with hash -77183713, now seen corresponding path program 7 times [2020-07-20 16:46:18,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:18,093 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [330703242] [2020-07-20 16:46:18,093 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 16:46:18,213 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:46:18,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:18,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:46:18,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:18,299 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 21 proven. 126 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2020-07-20 16:46:18,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:18,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:19,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:19,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:19,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:19,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:19,290 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 21 proven. 136 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2020-07-20 16:46:19,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [330703242] [2020-07-20 16:46:19,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:19,291 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:46:19,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603553647] [2020-07-20 16:46:19,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:46:19,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:19,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:46:19,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:46:19,292 INFO L87 Difference]: Start difference. First operand 180 states and 284 transitions. Second operand 16 states. [2020-07-20 16:46:19,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:19,503 INFO L93 Difference]: Finished difference Result 214 states and 364 transitions. [2020-07-20 16:46:19,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:46:19,506 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 121 [2020-07-20 16:46:19,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:19,509 INFO L225 Difference]: With dead ends: 214 [2020-07-20 16:46:19,509 INFO L226 Difference]: Without dead ends: 210 [2020-07-20 16:46:19,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 218 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 16:46:19,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2020-07-20 16:46:19,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 207. [2020-07-20 16:46:19,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2020-07-20 16:46:19,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 352 transitions. [2020-07-20 16:46:19,526 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 352 transitions. Word has length 121 [2020-07-20 16:46:19,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:19,526 INFO L479 AbstractCegarLoop]: Abstraction has 207 states and 352 transitions. [2020-07-20 16:46:19,526 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:46:19,527 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 352 transitions. [2020-07-20 16:46:19,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 16:46:19,529 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:19,529 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:19,743 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:19,744 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:19,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:19,744 INFO L82 PathProgramCache]: Analyzing trace with hash -1905629551, now seen corresponding path program 8 times [2020-07-20 16:46:19,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:19,744 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1640091849] [2020-07-20 16:46:19,745 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 16:46:19,858 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:46:19,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:19,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:46:19,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:19,918 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 47 proven. 86 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2020-07-20 16:46:19,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:20,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:20,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:20,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:20,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:20,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:20,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:20,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:20,587 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 47 proven. 91 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2020-07-20 16:46:20,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1640091849] [2020-07-20 16:46:20,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:20,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:46:20,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447312631] [2020-07-20 16:46:20,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:46:20,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:20,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:46:20,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:46:20,589 INFO L87 Difference]: Start difference. First operand 207 states and 352 transitions. Second operand 14 states. [2020-07-20 16:46:20,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:20,781 INFO L93 Difference]: Finished difference Result 237 states and 416 transitions. [2020-07-20 16:46:20,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:46:20,781 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-20 16:46:20,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:20,784 INFO L225 Difference]: With dead ends: 237 [2020-07-20 16:46:20,784 INFO L226 Difference]: Without dead ends: 233 [2020-07-20 16:46:20,785 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:46:20,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2020-07-20 16:46:20,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 207. [2020-07-20 16:46:20,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2020-07-20 16:46:20,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 352 transitions. [2020-07-20 16:46:20,802 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 352 transitions. Word has length 121 [2020-07-20 16:46:20,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:20,805 INFO L479 AbstractCegarLoop]: Abstraction has 207 states and 352 transitions. [2020-07-20 16:46:20,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:46:20,805 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 352 transitions. [2020-07-20 16:46:20,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-20 16:46:20,808 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:20,808 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:21,021 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:21,022 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:21,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:21,023 INFO L82 PathProgramCache]: Analyzing trace with hash -71686390, now seen corresponding path program 9 times [2020-07-20 16:46:21,023 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:21,023 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1027753189] [2020-07-20 16:46:21,024 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 16:46:21,145 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:46:21,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:21,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:46:21,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:21,209 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 76 proven. 73 refuted. 0 times theorem prover too weak. 269 trivial. 0 not checked. [2020-07-20 16:46:21,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:21,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:21,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:21,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:21,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:21,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:21,889 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 76 proven. 78 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2020-07-20 16:46:21,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1027753189] [2020-07-20 16:46:21,890 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:21,890 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:46:21,890 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829211206] [2020-07-20 16:46:21,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:46:21,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:21,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:46:21,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:46:21,891 INFO L87 Difference]: Start difference. First operand 207 states and 352 transitions. Second operand 14 states. [2020-07-20 16:46:22,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:22,082 INFO L93 Difference]: Finished difference Result 227 states and 392 transitions. [2020-07-20 16:46:22,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:46:22,082 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 133 [2020-07-20 16:46:22,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:22,086 INFO L225 Difference]: With dead ends: 227 [2020-07-20 16:46:22,086 INFO L226 Difference]: Without dead ends: 223 [2020-07-20 16:46:22,087 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 245 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:46:22,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2020-07-20 16:46:22,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 207. [2020-07-20 16:46:22,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2020-07-20 16:46:22,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 352 transitions. [2020-07-20 16:46:22,108 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 352 transitions. Word has length 133 [2020-07-20 16:46:22,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:22,109 INFO L479 AbstractCegarLoop]: Abstraction has 207 states and 352 transitions. [2020-07-20 16:46:22,109 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:46:22,109 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 352 transitions. [2020-07-20 16:46:22,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2020-07-20 16:46:22,113 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:22,113 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:22,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:22,328 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:22,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:22,328 INFO L82 PathProgramCache]: Analyzing trace with hash -142919899, now seen corresponding path program 10 times [2020-07-20 16:46:22,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:22,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1524851639] [2020-07-20 16:46:22,329 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 16:46:22,500 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:46:22,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:22,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:46:22,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:22,634 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 306 proven. 32 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2020-07-20 16:46:22,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:23,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:23,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:23,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:23,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:23,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:23,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:23,769 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 80 proven. 173 refuted. 0 times theorem prover too weak. 263 trivial. 0 not checked. [2020-07-20 16:46:23,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1524851639] [2020-07-20 16:46:23,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:23,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:46:23,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961327511] [2020-07-20 16:46:23,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:46:23,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:23,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:46:23,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:46:23,771 INFO L87 Difference]: Start difference. First operand 207 states and 352 transitions. Second operand 17 states. [2020-07-20 16:46:24,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:24,193 INFO L93 Difference]: Finished difference Result 409 states and 721 transitions. [2020-07-20 16:46:24,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 16:46:24,194 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 146 [2020-07-20 16:46:24,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:24,196 INFO L225 Difference]: With dead ends: 409 [2020-07-20 16:46:24,197 INFO L226 Difference]: Without dead ends: 207 [2020-07-20 16:46:24,199 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 265 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:46:24,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2020-07-20 16:46:24,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 191. [2020-07-20 16:46:24,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 191 states. [2020-07-20 16:46:24,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 303 transitions. [2020-07-20 16:46:24,213 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 303 transitions. Word has length 146 [2020-07-20 16:46:24,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:24,213 INFO L479 AbstractCegarLoop]: Abstraction has 191 states and 303 transitions. [2020-07-20 16:46:24,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:46:24,213 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 303 transitions. [2020-07-20 16:46:24,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-20 16:46:24,216 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:24,216 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:24,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:24,430 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:24,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:24,430 INFO L82 PathProgramCache]: Analyzing trace with hash 247206723, now seen corresponding path program 11 times [2020-07-20 16:46:24,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:24,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2011515208] [2020-07-20 16:46:24,431 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 16:46:24,602 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:46:24,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:24,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:46:24,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:24,681 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 134 proven. 31 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 16:46:24,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:25,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:25,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:25,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:25,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:25,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:25,492 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 136 proven. 34 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-07-20 16:46:25,492 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2011515208] [2020-07-20 16:46:25,492 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:25,493 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:46:25,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640311757] [2020-07-20 16:46:25,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:46:25,494 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:25,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:46:25,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:46:25,495 INFO L87 Difference]: Start difference. First operand 191 states and 303 transitions. Second operand 14 states. [2020-07-20 16:46:25,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:25,699 INFO L93 Difference]: Finished difference Result 198 states and 314 transitions. [2020-07-20 16:46:25,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:46:25,699 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 145 [2020-07-20 16:46:25,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:25,702 INFO L225 Difference]: With dead ends: 198 [2020-07-20 16:46:25,702 INFO L226 Difference]: Without dead ends: 194 [2020-07-20 16:46:25,703 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 270 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:46:25,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2020-07-20 16:46:25,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 174. [2020-07-20 16:46:25,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-20 16:46:25,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 269 transitions. [2020-07-20 16:46:25,715 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 269 transitions. Word has length 145 [2020-07-20 16:46:25,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:25,716 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 269 transitions. [2020-07-20 16:46:25,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:46:25,716 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 269 transitions. [2020-07-20 16:46:25,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2020-07-20 16:46:25,718 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:25,719 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 14, 12, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 6, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:25,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:25,933 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:25,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:25,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1138083817, now seen corresponding path program 12 times [2020-07-20 16:46:25,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:25,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [335267956] [2020-07-20 16:46:25,934 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 16:46:26,084 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:46:26,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:26,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:46:26,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:26,227 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 817 proven. 169 refuted. 0 times theorem prover too weak. 419 trivial. 0 not checked. [2020-07-20 16:46:26,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:27,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:27,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:27,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:27,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:27,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:28,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:28,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:28,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:28,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:28,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 154 proven. 476 refuted. 0 times theorem prover too weak. 775 trivial. 0 not checked. [2020-07-20 16:46:28,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [335267956] [2020-07-20 16:46:28,346 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:28,346 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:46:28,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389936512] [2020-07-20 16:46:28,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:46:28,347 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:28,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:46:28,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:46:28,347 INFO L87 Difference]: Start difference. First operand 174 states and 269 transitions. Second operand 23 states. [2020-07-20 16:46:29,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:29,258 INFO L93 Difference]: Finished difference Result 382 states and 655 transitions. [2020-07-20 16:46:29,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 16:46:29,259 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 231 [2020-07-20 16:46:29,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:29,261 INFO L225 Difference]: With dead ends: 382 [2020-07-20 16:46:29,261 INFO L226 Difference]: Without dead ends: 209 [2020-07-20 16:46:29,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 423 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=276, Invalid=1284, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 16:46:29,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-20 16:46:29,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 189. [2020-07-20 16:46:29,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2020-07-20 16:46:29,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 290 transitions. [2020-07-20 16:46:29,294 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 290 transitions. Word has length 231 [2020-07-20 16:46:29,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:29,294 INFO L479 AbstractCegarLoop]: Abstraction has 189 states and 290 transitions. [2020-07-20 16:46:29,295 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:46:29,295 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 290 transitions. [2020-07-20 16:46:29,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2020-07-20 16:46:29,298 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:29,298 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 18, 18, 17, 14, 14, 14, 14, 14, 14, 14, 14, 12, 9, 9, 9, 9, 9, 9, 9, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:29,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:29,510 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:29,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:29,511 INFO L82 PathProgramCache]: Analyzing trace with hash -61664322, now seen corresponding path program 5 times [2020-07-20 16:46:29,512 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:29,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050896379] [2020-07-20 16:46:29,512 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 16:46:29,700 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:46:29,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:29,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:46:29,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:29,841 INFO L134 CoverageAnalysis]: Checked inductivity of 2971 backedges. 1697 proven. 149 refuted. 0 times theorem prover too weak. 1125 trivial. 0 not checked. [2020-07-20 16:46:29,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:31,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:31,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:31,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:31,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:31,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:31,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:31,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:31,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:31,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:31,618 INFO L134 CoverageAnalysis]: Checked inductivity of 2971 backedges. 233 proven. 556 refuted. 0 times theorem prover too weak. 2182 trivial. 0 not checked. [2020-07-20 16:46:31,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2050896379] [2020-07-20 16:46:31,619 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:31,619 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-20 16:46:31,619 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965311728] [2020-07-20 16:46:31,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 16:46:31,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:31,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 16:46:31,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:46:31,620 INFO L87 Difference]: Start difference. First operand 189 states and 290 transitions. Second operand 19 states. [2020-07-20 16:46:32,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:32,234 INFO L93 Difference]: Finished difference Result 445 states and 745 transitions. [2020-07-20 16:46:32,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 16:46:32,235 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 320 [2020-07-20 16:46:32,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:32,238 INFO L225 Difference]: With dead ends: 445 [2020-07-20 16:46:32,238 INFO L226 Difference]: Without dead ends: 244 [2020-07-20 16:46:32,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 610 SyntacticMatches, 13 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=214, Invalid=908, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 16:46:32,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2020-07-20 16:46:32,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 185. [2020-07-20 16:46:32,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 185 states. [2020-07-20 16:46:32,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 291 transitions. [2020-07-20 16:46:32,254 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 291 transitions. Word has length 320 [2020-07-20 16:46:32,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:32,254 INFO L479 AbstractCegarLoop]: Abstraction has 185 states and 291 transitions. [2020-07-20 16:46:32,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 16:46:32,255 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 291 transitions. [2020-07-20 16:46:32,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2020-07-20 16:46:32,257 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:32,257 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 12, 11, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:32,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:32,471 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:32,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:32,472 INFO L82 PathProgramCache]: Analyzing trace with hash -31808317, now seen corresponding path program 13 times [2020-07-20 16:46:32,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:32,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1193395261] [2020-07-20 16:46:32,473 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 16:46:32,662 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:46:32,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:32,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:46:32,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:32,851 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 214 proven. 358 refuted. 0 times theorem prover too weak. 501 trivial. 0 not checked. [2020-07-20 16:46:32,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:34,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:34,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:34,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:34,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:34,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:34,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:35,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:35,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:35,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:35,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:35,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:35,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:35,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:35,429 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 214 proven. 378 refuted. 0 times theorem prover too weak. 481 trivial. 0 not checked. [2020-07-20 16:46:35,429 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1193395261] [2020-07-20 16:46:35,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:35,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-20 16:46:35,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984906119] [2020-07-20 16:46:35,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 16:46:35,431 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:35,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 16:46:35,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:46:35,431 INFO L87 Difference]: Start difference. First operand 185 states and 291 transitions. Second operand 27 states. [2020-07-20 16:46:36,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:36,838 INFO L93 Difference]: Finished difference Result 411 states and 712 transitions. [2020-07-20 16:46:36,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 16:46:36,846 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 204 [2020-07-20 16:46:36,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:36,849 INFO L225 Difference]: With dead ends: 411 [2020-07-20 16:46:36,849 INFO L226 Difference]: Without dead ends: 231 [2020-07-20 16:46:36,853 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 361 SyntacticMatches, 21 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 461 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=408, Invalid=2042, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 16:46:36,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2020-07-20 16:46:36,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 207. [2020-07-20 16:46:36,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2020-07-20 16:46:36,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 318 transitions. [2020-07-20 16:46:36,866 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 318 transitions. Word has length 204 [2020-07-20 16:46:36,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:36,867 INFO L479 AbstractCegarLoop]: Abstraction has 207 states and 318 transitions. [2020-07-20 16:46:36,867 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 16:46:36,867 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 318 transitions. [2020-07-20 16:46:36,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2020-07-20 16:46:36,870 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:36,870 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 16, 16, 12, 11, 10, 10, 10, 10, 10, 10, 10, 9, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:37,083 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:37,084 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:37,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:37,084 INFO L82 PathProgramCache]: Analyzing trace with hash 2101852289, now seen corresponding path program 14 times [2020-07-20 16:46:37,084 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:37,084 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [862285356] [2020-07-20 16:46:37,084 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 16:46:37,296 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:46:37,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:37,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:46:37,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:37,463 INFO L134 CoverageAnalysis]: Checked inductivity of 1733 backedges. 317 proven. 348 refuted. 0 times theorem prover too weak. 1068 trivial. 0 not checked. [2020-07-20 16:46:37,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:38,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:38,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:38,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:38,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:38,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:38,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:39,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:39,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:39,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:39,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:39,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:39,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:39,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:39,356 INFO L134 CoverageAnalysis]: Checked inductivity of 1733 backedges. 317 proven. 358 refuted. 0 times theorem prover too weak. 1058 trivial. 0 not checked. [2020-07-20 16:46:39,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [862285356] [2020-07-20 16:46:39,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:39,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:46:39,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684435261] [2020-07-20 16:46:39,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:46:39,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:39,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:46:39,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:46:39,358 INFO L87 Difference]: Start difference. First operand 207 states and 318 transitions. Second operand 23 states. [2020-07-20 16:46:40,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:40,411 INFO L93 Difference]: Finished difference Result 529 states and 886 transitions. [2020-07-20 16:46:40,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 16:46:40,411 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 252 [2020-07-20 16:46:40,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:40,416 INFO L225 Difference]: With dead ends: 529 [2020-07-20 16:46:40,416 INFO L226 Difference]: Without dead ends: 316 [2020-07-20 16:46:40,418 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 465 SyntacticMatches, 17 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=315, Invalid=1491, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 16:46:40,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2020-07-20 16:46:40,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 236. [2020-07-20 16:46:40,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-20 16:46:40,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 379 transitions. [2020-07-20 16:46:40,435 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 379 transitions. Word has length 252 [2020-07-20 16:46:40,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:40,436 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 379 transitions. [2020-07-20 16:46:40,436 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:46:40,436 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 379 transitions. [2020-07-20 16:46:40,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-20 16:46:40,439 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:40,439 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:40,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:40,655 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:40,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:40,655 INFO L82 PathProgramCache]: Analyzing trace with hash 1148569106, now seen corresponding path program 15 times [2020-07-20 16:46:40,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:40,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [853580843] [2020-07-20 16:46:40,656 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 16:46:40,843 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:46:40,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:40,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:46:40,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:40,940 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 59 proven. 276 refuted. 0 times theorem prover too weak. 575 trivial. 0 not checked. [2020-07-20 16:46:40,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:41,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:41,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:42,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:42,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:42,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:42,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:42,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:42,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:42,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:42,576 INFO L134 CoverageAnalysis]: Checked inductivity of 910 backedges. 59 proven. 292 refuted. 0 times theorem prover too weak. 559 trivial. 0 not checked. [2020-07-20 16:46:42,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [853580843] [2020-07-20 16:46:42,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:42,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:46:42,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220450146] [2020-07-20 16:46:42,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:46:42,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:42,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:46:42,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:46:42,578 INFO L87 Difference]: Start difference. First operand 236 states and 379 transitions. Second operand 18 states. [2020-07-20 16:46:42,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:42,834 INFO L93 Difference]: Finished difference Result 248 states and 397 transitions. [2020-07-20 16:46:42,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:46:42,835 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 189 [2020-07-20 16:46:42,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:42,838 INFO L225 Difference]: With dead ends: 248 [2020-07-20 16:46:42,838 INFO L226 Difference]: Without dead ends: 244 [2020-07-20 16:46:42,840 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 349 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:46:42,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2020-07-20 16:46:42,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 236. [2020-07-20 16:46:42,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-20 16:46:42,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 379 transitions. [2020-07-20 16:46:42,863 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 379 transitions. Word has length 189 [2020-07-20 16:46:42,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:42,863 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 379 transitions. [2020-07-20 16:46:42,863 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:46:42,863 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 379 transitions. [2020-07-20 16:46:42,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 420 [2020-07-20 16:46:42,869 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:42,870 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 29, 29, 23, 23, 16, 16, 16, 16, 16, 16, 16, 14, 14, 14, 14, 14, 14, 14, 9, 9, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:43,083 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:43,084 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:43,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:43,084 INFO L82 PathProgramCache]: Analyzing trace with hash -663179755, now seen corresponding path program 16 times [2020-07-20 16:46:43,084 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:43,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1307523204] [2020-07-20 16:46:43,085 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 16:46:43,301 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:46:43,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:43,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:46:43,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:43,508 INFO L134 CoverageAnalysis]: Checked inductivity of 4958 backedges. 2796 proven. 227 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2020-07-20 16:46:43,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:45,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:45,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:45,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:45,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:45,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:45,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:45,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:45,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:46,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:46,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:46,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:46,521 INFO L134 CoverageAnalysis]: Checked inductivity of 4958 backedges. 351 proven. 952 refuted. 0 times theorem prover too weak. 3655 trivial. 0 not checked. [2020-07-20 16:46:46,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1307523204] [2020-07-20 16:46:46,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:46,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25 [2020-07-20 16:46:46,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952280127] [2020-07-20 16:46:46,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:46:46,522 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:46,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:46:46,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:46:46,523 INFO L87 Difference]: Start difference. First operand 236 states and 379 transitions. Second operand 25 states. [2020-07-20 16:46:47,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:47,529 INFO L93 Difference]: Finished difference Result 562 states and 965 transitions. [2020-07-20 16:46:47,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 16:46:47,529 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 419 [2020-07-20 16:46:47,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:47,533 INFO L225 Difference]: With dead ends: 562 [2020-07-20 16:46:47,533 INFO L226 Difference]: Without dead ends: 332 [2020-07-20 16:46:47,535 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 855 GetRequests, 799 SyntacticMatches, 15 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=306, Invalid=1500, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 16:46:47,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2020-07-20 16:46:47,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 274. [2020-07-20 16:46:47,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2020-07-20 16:46:47,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 455 transitions. [2020-07-20 16:46:47,554 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 455 transitions. Word has length 419 [2020-07-20 16:46:47,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:47,554 INFO L479 AbstractCegarLoop]: Abstraction has 274 states and 455 transitions. [2020-07-20 16:46:47,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:46:47,555 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 455 transitions. [2020-07-20 16:46:47,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2020-07-20 16:46:47,558 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:47,558 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 14, 14, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 8, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:47,772 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:47,773 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:47,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:47,773 INFO L82 PathProgramCache]: Analyzing trace with hash 1245531686, now seen corresponding path program 17 times [2020-07-20 16:46:47,773 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:47,774 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [337037440] [2020-07-20 16:46:47,774 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 16:46:48,019 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:46:48,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:48,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 442 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:46:48,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:48,243 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 433 proven. 510 refuted. 0 times theorem prover too weak. 1403 trivial. 0 not checked. [2020-07-20 16:46:48,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:49,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:49,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:50,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:50,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:50,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:50,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:50,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:50,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:51,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:51,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:51,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:51,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:51,482 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 433 proven. 531 refuted. 0 times theorem prover too weak. 1382 trivial. 0 not checked. [2020-07-20 16:46:51,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [337037440] [2020-07-20 16:46:51,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:51,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 29 [2020-07-20 16:46:51,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178513397] [2020-07-20 16:46:51,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:46:51,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:51,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:46:51,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=717, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:46:51,484 INFO L87 Difference]: Start difference. First operand 274 states and 455 transitions. Second operand 29 states. [2020-07-20 16:46:53,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:53,044 INFO L93 Difference]: Finished difference Result 684 states and 1295 transitions. [2020-07-20 16:46:53,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 16:46:53,047 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 293 [2020-07-20 16:46:53,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:53,053 INFO L225 Difference]: With dead ends: 684 [2020-07-20 16:46:53,053 INFO L226 Difference]: Without dead ends: 416 [2020-07-20 16:46:53,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 610 GetRequests, 539 SyntacticMatches, 19 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 555 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=457, Invalid=2405, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 16:46:53,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2020-07-20 16:46:53,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 329. [2020-07-20 16:46:53,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 329 states. [2020-07-20 16:46:53,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 609 transitions. [2020-07-20 16:46:53,085 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 609 transitions. Word has length 293 [2020-07-20 16:46:53,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:53,086 INFO L479 AbstractCegarLoop]: Abstraction has 329 states and 609 transitions. [2020-07-20 16:46:53,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:46:53,086 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 609 transitions. [2020-07-20 16:46:53,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2020-07-20 16:46:53,090 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:53,090 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 9, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:53,304 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:53,305 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:53,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:53,305 INFO L82 PathProgramCache]: Analyzing trace with hash 1810951865, now seen corresponding path program 18 times [2020-07-20 16:46:53,306 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:53,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [641538693] [2020-07-20 16:46:53,306 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 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 16:46:53,604 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:46:53,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:53,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:46:53,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:53,775 INFO L134 CoverageAnalysis]: Checked inductivity of 1016 backedges. 278 proven. 192 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2020-07-20 16:46:53,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:54,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:54,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:54,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:54,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:54,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:55,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:55,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:55,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:55,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:55,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:55,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:55,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:55,709 INFO L134 CoverageAnalysis]: Checked inductivity of 1016 backedges. 278 proven. 201 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2020-07-20 16:46:55,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [641538693] [2020-07-20 16:46:55,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:55,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:46:55,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386166169] [2020-07-20 16:46:55,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:46:55,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:55,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:46:55,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:46:55,711 INFO L87 Difference]: Start difference. First operand 329 states and 609 transitions. Second operand 23 states. [2020-07-20 16:46:56,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:56,393 INFO L93 Difference]: Finished difference Result 645 states and 1229 transitions. [2020-07-20 16:46:56,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 16:46:56,393 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 198 [2020-07-20 16:46:56,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:56,397 INFO L225 Difference]: With dead ends: 645 [2020-07-20 16:46:56,398 INFO L226 Difference]: Without dead ends: 322 [2020-07-20 16:46:56,400 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 407 GetRequests, 357 SyntacticMatches, 17 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=201, Invalid=989, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 16:46:56,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-20 16:46:56,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 286. [2020-07-20 16:46:56,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2020-07-20 16:46:56,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 480 transitions. [2020-07-20 16:46:56,420 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 480 transitions. Word has length 198 [2020-07-20 16:46:56,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:56,421 INFO L479 AbstractCegarLoop]: Abstraction has 286 states and 480 transitions. [2020-07-20 16:46:56,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:46:56,421 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 480 transitions. [2020-07-20 16:46:56,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-20 16:46:56,424 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:56,424 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 10, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:56,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:56,638 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:56,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:56,639 INFO L82 PathProgramCache]: Analyzing trace with hash -1711365749, now seen corresponding path program 19 times [2020-07-20 16:46:56,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:56,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1821578952] [2020-07-20 16:46:56,639 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 16:46:56,906 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:46:56,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:56,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:46:56,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:57,032 INFO L134 CoverageAnalysis]: Checked inductivity of 1042 backedges. 111 proven. 200 refuted. 0 times theorem prover too weak. 731 trivial. 0 not checked. [2020-07-20 16:46:57,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:57,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:57,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:58,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:58,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:58,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:58,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:58,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:46:58,299 INFO L134 CoverageAnalysis]: Checked inductivity of 1042 backedges. 111 proven. 210 refuted. 0 times theorem prover too weak. 721 trivial. 0 not checked. [2020-07-20 16:46:58,300 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1821578952] [2020-07-20 16:46:58,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:46:58,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:46:58,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793258943] [2020-07-20 16:46:58,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:46:58,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:46:58,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:46:58,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:46:58,301 INFO L87 Difference]: Start difference. First operand 286 states and 480 transitions. Second operand 16 states. [2020-07-20 16:46:58,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:46:58,520 INFO L93 Difference]: Finished difference Result 304 states and 514 transitions. [2020-07-20 16:46:58,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:46:58,521 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 201 [2020-07-20 16:46:58,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:46:58,524 INFO L225 Difference]: With dead ends: 304 [2020-07-20 16:46:58,524 INFO L226 Difference]: Without dead ends: 300 [2020-07-20 16:46:58,525 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 377 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 16:46:58,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2020-07-20 16:46:58,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 290. [2020-07-20 16:46:58,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2020-07-20 16:46:58,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 489 transitions. [2020-07-20 16:46:58,545 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 489 transitions. Word has length 201 [2020-07-20 16:46:58,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:46:58,545 INFO L479 AbstractCegarLoop]: Abstraction has 290 states and 489 transitions. [2020-07-20 16:46:58,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:46:58,546 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 489 transitions. [2020-07-20 16:46:58,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2020-07-20 16:46:58,549 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:46:58,549 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 10, 10, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 6, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:46:58,765 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:46:58,766 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:46:58,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:46:58,767 INFO L82 PathProgramCache]: Analyzing trace with hash 124404788, now seen corresponding path program 20 times [2020-07-20 16:46:58,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:46:58,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [333750387] [2020-07-20 16:46:58,768 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 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 16:46:59,044 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:46:59,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:46:59,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:46:59,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:46:59,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 172 proven. 159 refuted. 0 times theorem prover too weak. 855 trivial. 0 not checked. [2020-07-20 16:46:59,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:46:59,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:00,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:00,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:00,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:00,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:00,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:00,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:00,524 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 174 proven. 167 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2020-07-20 16:47:00,524 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [333750387] [2020-07-20 16:47:00,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:00,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:47:00,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875268942] [2020-07-20 16:47:00,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:47:00,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:00,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:47:00,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:47:00,526 INFO L87 Difference]: Start difference. First operand 290 states and 489 transitions. Second operand 16 states. [2020-07-20 16:47:00,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:00,801 INFO L93 Difference]: Finished difference Result 335 states and 599 transitions. [2020-07-20 16:47:00,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:47:00,802 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 213 [2020-07-20 16:47:00,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:00,807 INFO L225 Difference]: With dead ends: 335 [2020-07-20 16:47:00,807 INFO L226 Difference]: Without dead ends: 331 [2020-07-20 16:47:00,809 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 401 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 16:47:00,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2020-07-20 16:47:00,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 301. [2020-07-20 16:47:00,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 301 states. [2020-07-20 16:47:00,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 520 transitions. [2020-07-20 16:47:00,831 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 520 transitions. Word has length 213 [2020-07-20 16:47:00,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:00,832 INFO L479 AbstractCegarLoop]: Abstraction has 301 states and 520 transitions. [2020-07-20 16:47:00,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:47:00,832 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 520 transitions. [2020-07-20 16:47:00,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2020-07-20 16:47:00,836 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:00,836 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 19, 19, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 9, 9, 9, 9, 9, 9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:01,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:01,052 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:01,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:01,053 INFO L82 PathProgramCache]: Analyzing trace with hash -1606050571, now seen corresponding path program 21 times [2020-07-20 16:47:01,053 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:01,053 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [463606728] [2020-07-20 16:47:01,054 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 16:47:01,350 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:47:01,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:01,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:47:01,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:01,514 INFO L134 CoverageAnalysis]: Checked inductivity of 2093 backedges. 1076 proven. 279 refuted. 0 times theorem prover too weak. 738 trivial. 0 not checked. [2020-07-20 16:47:01,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:02,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:03,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:03,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:03,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:04,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:04,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:04,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:04,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:04,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:04,265 INFO L134 CoverageAnalysis]: Checked inductivity of 2093 backedges. 253 proven. 522 refuted. 0 times theorem prover too weak. 1318 trivial. 0 not checked. [2020-07-20 16:47:04,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [463606728] [2020-07-20 16:47:04,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:04,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-20 16:47:04,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465879470] [2020-07-20 16:47:04,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:47:04,267 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:04,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:47:04,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2020-07-20 16:47:04,268 INFO L87 Difference]: Start difference. First operand 301 states and 520 transitions. Second operand 23 states. [2020-07-20 16:47:05,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:05,134 INFO L93 Difference]: Finished difference Result 645 states and 1201 transitions. [2020-07-20 16:47:05,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 16:47:05,135 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 276 [2020-07-20 16:47:05,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:05,139 INFO L225 Difference]: With dead ends: 645 [2020-07-20 16:47:05,139 INFO L226 Difference]: Without dead ends: 338 [2020-07-20 16:47:05,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 567 GetRequests, 514 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=252, Invalid=1154, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 16:47:05,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2020-07-20 16:47:05,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 277. [2020-07-20 16:47:05,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2020-07-20 16:47:05,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 458 transitions. [2020-07-20 16:47:05,162 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 458 transitions. Word has length 276 [2020-07-20 16:47:05,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:05,162 INFO L479 AbstractCegarLoop]: Abstraction has 277 states and 458 transitions. [2020-07-20 16:47:05,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:47:05,162 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 458 transitions. [2020-07-20 16:47:05,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2020-07-20 16:47:05,165 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:05,165 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 10, 10, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 6, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:05,378 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:05,379 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:05,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:05,379 INFO L82 PathProgramCache]: Analyzing trace with hash -320404286, now seen corresponding path program 22 times [2020-07-20 16:47:05,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:05,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1672483651] [2020-07-20 16:47:05,380 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 16:47:05,676 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:47:05,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:05,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:47:05,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:05,773 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 94 proven. 237 refuted. 0 times theorem prover too weak. 855 trivial. 0 not checked. [2020-07-20 16:47:05,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:06,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:06,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:07,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:07,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:07,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:07,188 INFO L134 CoverageAnalysis]: Checked inductivity of 1186 backedges. 94 proven. 247 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2020-07-20 16:47:07,188 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1672483651] [2020-07-20 16:47:07,188 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:07,188 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:47:07,189 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501705248] [2020-07-20 16:47:07,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:47:07,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:07,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:47:07,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:47:07,190 INFO L87 Difference]: Start difference. First operand 277 states and 458 transitions. Second operand 16 states. [2020-07-20 16:47:07,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:07,438 INFO L93 Difference]: Finished difference Result 312 states and 524 transitions. [2020-07-20 16:47:07,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:47:07,439 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 213 [2020-07-20 16:47:07,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:07,443 INFO L225 Difference]: With dead ends: 312 [2020-07-20 16:47:07,443 INFO L226 Difference]: Without dead ends: 308 [2020-07-20 16:47:07,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 401 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 16:47:07,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2020-07-20 16:47:07,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 272. [2020-07-20 16:47:07,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2020-07-20 16:47:07,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 450 transitions. [2020-07-20 16:47:07,460 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 450 transitions. Word has length 213 [2020-07-20 16:47:07,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:07,461 INFO L479 AbstractCegarLoop]: Abstraction has 272 states and 450 transitions. [2020-07-20 16:47:07,461 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:47:07,461 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 450 transitions. [2020-07-20 16:47:07,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-07-20 16:47:07,464 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:07,464 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 15, 15, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:07,678 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:07,679 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:07,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:07,680 INFO L82 PathProgramCache]: Analyzing trace with hash 51685547, now seen corresponding path program 23 times [2020-07-20 16:47:07,680 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:07,680 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1920672390] [2020-07-20 16:47:07,680 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 16:47:08,007 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:47:08,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:08,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:47:08,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:08,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1350 backedges. 160 proven. 133 refuted. 0 times theorem prover too weak. 1057 trivial. 0 not checked. [2020-07-20 16:47:08,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:08,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:08,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:08,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:08,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:08,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:09,150 INFO L134 CoverageAnalysis]: Checked inductivity of 1350 backedges. 160 proven. 138 refuted. 0 times theorem prover too weak. 1052 trivial. 0 not checked. [2020-07-20 16:47:09,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1920672390] [2020-07-20 16:47:09,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:09,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 16:47:09,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615112980] [2020-07-20 16:47:09,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:47:09,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:09,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:47:09,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:47:09,151 INFO L87 Difference]: Start difference. First operand 272 states and 450 transitions. Second operand 14 states. [2020-07-20 16:47:09,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:09,331 INFO L93 Difference]: Finished difference Result 319 states and 565 transitions. [2020-07-20 16:47:09,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:47:09,332 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 225 [2020-07-20 16:47:09,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:09,336 INFO L225 Difference]: With dead ends: 319 [2020-07-20 16:47:09,336 INFO L226 Difference]: Without dead ends: 315 [2020-07-20 16:47:09,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 429 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:47:09,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2020-07-20 16:47:09,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 272. [2020-07-20 16:47:09,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2020-07-20 16:47:09,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 450 transitions. [2020-07-20 16:47:09,355 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 450 transitions. Word has length 225 [2020-07-20 16:47:09,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:09,356 INFO L479 AbstractCegarLoop]: Abstraction has 272 states and 450 transitions. [2020-07-20 16:47:09,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:47:09,356 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 450 transitions. [2020-07-20 16:47:09,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-20 16:47:09,358 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:09,359 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:09,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:09,572 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:09,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:09,573 INFO L82 PathProgramCache]: Analyzing trace with hash 120952594, now seen corresponding path program 24 times [2020-07-20 16:47:09,573 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:09,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119710964] [2020-07-20 16:47:09,574 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 16:47:09,881 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:47:09,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:09,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:47:09,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:10,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 301 proven. 76 refuted. 0 times theorem prover too weak. 1125 trivial. 0 not checked. [2020-07-20 16:47:10,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:10,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:10,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:10,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:11,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:11,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:11,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:11,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:11,548 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 303 proven. 84 refuted. 0 times theorem prover too weak. 1115 trivial. 0 not checked. [2020-07-20 16:47:11,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119710964] [2020-07-20 16:47:11,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:11,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 16:47:11,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748406387] [2020-07-20 16:47:11,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 16:47:11,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:11,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 16:47:11,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 16:47:11,550 INFO L87 Difference]: Start difference. First operand 272 states and 450 transitions. Second operand 16 states. [2020-07-20 16:47:11,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:11,779 INFO L93 Difference]: Finished difference Result 292 states and 497 transitions. [2020-07-20 16:47:11,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 16:47:11,780 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 237 [2020-07-20 16:47:11,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:11,785 INFO L225 Difference]: With dead ends: 292 [2020-07-20 16:47:11,785 INFO L226 Difference]: Without dead ends: 288 [2020-07-20 16:47:11,786 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 450 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 16:47:11,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2020-07-20 16:47:11,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 280. [2020-07-20 16:47:11,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2020-07-20 16:47:11,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 478 transitions. [2020-07-20 16:47:11,802 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 478 transitions. Word has length 237 [2020-07-20 16:47:11,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:11,803 INFO L479 AbstractCegarLoop]: Abstraction has 280 states and 478 transitions. [2020-07-20 16:47:11,803 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 16:47:11,803 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 478 transitions. [2020-07-20 16:47:11,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2020-07-20 16:47:11,805 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:11,806 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:12,016 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:12,017 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:12,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:12,018 INFO L82 PathProgramCache]: Analyzing trace with hash -1694881932, now seen corresponding path program 3 times [2020-07-20 16:47:12,018 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:12,018 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [980626744] [2020-07-20 16:47:12,019 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 16:47:12,341 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:47:12,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:12,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:47:12,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:12,492 INFO L134 CoverageAnalysis]: Checked inductivity of 1858 backedges. 90 proven. 477 refuted. 0 times theorem prover too weak. 1291 trivial. 0 not checked. [2020-07-20 16:47:12,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:14,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:14,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:14,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:14,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:14,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:15,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:15,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:15,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:15,289 INFO L134 CoverageAnalysis]: Checked inductivity of 1858 backedges. 90 proven. 498 refuted. 0 times theorem prover too weak. 1270 trivial. 0 not checked. [2020-07-20 16:47:15,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [980626744] [2020-07-20 16:47:15,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:15,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 16:47:15,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033430569] [2020-07-20 16:47:15,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 16:47:15,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:15,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 16:47:15,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:47:15,291 INFO L87 Difference]: Start difference. First operand 280 states and 478 transitions. Second operand 20 states. [2020-07-20 16:47:15,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:15,614 INFO L93 Difference]: Finished difference Result 300 states and 518 transitions. [2020-07-20 16:47:15,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:47:15,615 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 261 [2020-07-20 16:47:15,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:15,618 INFO L225 Difference]: With dead ends: 300 [2020-07-20 16:47:15,618 INFO L226 Difference]: Without dead ends: 296 [2020-07-20 16:47:15,619 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 490 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:47:15,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2020-07-20 16:47:15,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 280. [2020-07-20 16:47:15,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2020-07-20 16:47:15,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 478 transitions. [2020-07-20 16:47:15,634 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 478 transitions. Word has length 261 [2020-07-20 16:47:15,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:15,634 INFO L479 AbstractCegarLoop]: Abstraction has 280 states and 478 transitions. [2020-07-20 16:47:15,634 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 16:47:15,634 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 478 transitions. [2020-07-20 16:47:15,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2020-07-20 16:47:15,637 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:15,637 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 19, 19, 14, 14, 11, 11, 11, 11, 11, 11, 11, 9, 9, 9, 9, 9, 9, 9, 8, 5, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:15,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:15,871 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:15,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:15,872 INFO L82 PathProgramCache]: Analyzing trace with hash -156771147, now seen corresponding path program 25 times [2020-07-20 16:47:15,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:15,873 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257969435] [2020-07-20 16:47:15,873 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 16:47:16,212 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:47:16,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:16,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:47:16,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:16,445 INFO L134 CoverageAnalysis]: Checked inductivity of 2154 backedges. 430 proven. 529 refuted. 0 times theorem prover too weak. 1195 trivial. 0 not checked. [2020-07-20 16:47:16,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:17,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:18,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:18,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:18,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:18,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:18,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:19,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:19,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:19,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:20,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:20,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:20,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:20,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:20,400 INFO L134 CoverageAnalysis]: Checked inductivity of 2154 backedges. 430 proven. 553 refuted. 0 times theorem prover too weak. 1171 trivial. 0 not checked. [2020-07-20 16:47:20,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257969435] [2020-07-20 16:47:20,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:20,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-20 16:47:20,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167395289] [2020-07-20 16:47:20,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:47:20,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:20,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:47:20,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=713, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:47:20,403 INFO L87 Difference]: Start difference. First operand 280 states and 478 transitions. Second operand 29 states. [2020-07-20 16:47:21,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:21,781 INFO L93 Difference]: Finished difference Result 586 states and 1068 transitions. [2020-07-20 16:47:21,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 16:47:21,785 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 281 [2020-07-20 16:47:21,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:21,790 INFO L225 Difference]: With dead ends: 586 [2020-07-20 16:47:21,790 INFO L226 Difference]: Without dead ends: 312 [2020-07-20 16:47:21,794 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 581 GetRequests, 511 SyntacticMatches, 23 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=373, Invalid=1979, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 16:47:21,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2020-07-20 16:47:21,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 279. [2020-07-20 16:47:21,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 279 states. [2020-07-20 16:47:21,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 443 transitions. [2020-07-20 16:47:21,812 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 443 transitions. Word has length 281 [2020-07-20 16:47:21,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:21,813 INFO L479 AbstractCegarLoop]: Abstraction has 279 states and 443 transitions. [2020-07-20 16:47:21,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:47:21,813 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 443 transitions. [2020-07-20 16:47:21,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 665 [2020-07-20 16:47:21,819 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:21,819 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 46, 46, 38, 37, 25, 25, 25, 25, 25, 25, 25, 23, 23, 23, 23, 23, 23, 23, 14, 14, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:22,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:22,036 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:22,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:22,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1693017985, now seen corresponding path program 26 times [2020-07-20 16:47:22,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:22,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [44371198] [2020-07-20 16:47:22,038 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 16:47:22,453 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:47:22,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:22,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:47:22,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:22,797 INFO L134 CoverageAnalysis]: Checked inductivity of 12821 backedges. 6739 proven. 686 refuted. 0 times theorem prover too weak. 5396 trivial. 0 not checked. [2020-07-20 16:47:22,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:26,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:26,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:26,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:26,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:26,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:27,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:27,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:27,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:27,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:28,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:28,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:28,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:28,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:28,336 INFO L134 CoverageAnalysis]: Checked inductivity of 12821 backedges. 448 proven. 2244 refuted. 0 times theorem prover too weak. 10129 trivial. 0 not checked. [2020-07-20 16:47:28,337 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [44371198] [2020-07-20 16:47:28,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:28,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 29 [2020-07-20 16:47:28,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085658106] [2020-07-20 16:47:28,339 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:47:28,339 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:28,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:47:28,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=716, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:47:28,340 INFO L87 Difference]: Start difference. First operand 279 states and 443 transitions. Second operand 29 states. [2020-07-20 16:47:29,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:29,997 INFO L93 Difference]: Finished difference Result 644 states and 1115 transitions. [2020-07-20 16:47:29,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 16:47:29,998 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 664 [2020-07-20 16:47:29,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:30,001 INFO L225 Difference]: With dead ends: 644 [2020-07-20 16:47:30,001 INFO L226 Difference]: Without dead ends: 371 [2020-07-20 16:47:30,004 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1352 GetRequests, 1281 SyntacticMatches, 19 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=460, Invalid=2402, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 16:47:30,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2020-07-20 16:47:30,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 315. [2020-07-20 16:47:30,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 315 states. [2020-07-20 16:47:30,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 526 transitions. [2020-07-20 16:47:30,024 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 526 transitions. Word has length 664 [2020-07-20 16:47:30,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:30,026 INFO L479 AbstractCegarLoop]: Abstraction has 315 states and 526 transitions. [2020-07-20 16:47:30,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:47:30,026 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 526 transitions. [2020-07-20 16:47:30,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 471 [2020-07-20 16:47:30,031 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:30,031 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 31, 31, 25, 24, 19, 19, 19, 19, 19, 19, 19, 15, 15, 15, 15, 15, 15, 15, 14, 9, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:30,246 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:30,247 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:30,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:30,248 INFO L82 PathProgramCache]: Analyzing trace with hash 1339318637, now seen corresponding path program 27 times [2020-07-20 16:47:30,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:30,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [342193821] [2020-07-20 16:47:30,249 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 16:47:30,665 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:47:30,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:30,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 702 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 16:47:30,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:31,045 INFO L134 CoverageAnalysis]: Checked inductivity of 6352 backedges. 672 proven. 1449 refuted. 0 times theorem prover too weak. 4231 trivial. 0 not checked. [2020-07-20 16:47:31,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:34,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:34,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:34,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:34,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:35,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:35,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:35,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:35,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:35,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:36,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:37,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:37,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:37,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:37,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:37,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:37,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:37,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:37,713 INFO L134 CoverageAnalysis]: Checked inductivity of 6352 backedges. 672 proven. 1489 refuted. 0 times theorem prover too weak. 4191 trivial. 0 not checked. [2020-07-20 16:47:37,713 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [342193821] [2020-07-20 16:47:37,713 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:37,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 35 [2020-07-20 16:47:37,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884909545] [2020-07-20 16:47:37,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 16:47:37,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:37,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 16:47:37,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1062, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 16:47:37,716 INFO L87 Difference]: Start difference. First operand 315 states and 526 transitions. Second operand 35 states. [2020-07-20 16:47:40,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:40,245 INFO L93 Difference]: Finished difference Result 800 states and 1531 transitions. [2020-07-20 16:47:40,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-07-20 16:47:40,246 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 470 [2020-07-20 16:47:40,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:40,253 INFO L225 Difference]: With dead ends: 800 [2020-07-20 16:47:40,253 INFO L226 Difference]: Without dead ends: 483 [2020-07-20 16:47:40,257 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 971 GetRequests, 881 SyntacticMatches, 25 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 968 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=660, Invalid=3762, Unknown=0, NotChecked=0, Total=4422 [2020-07-20 16:47:40,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 483 states. [2020-07-20 16:47:40,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 483 to 372. [2020-07-20 16:47:40,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2020-07-20 16:47:40,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 651 transitions. [2020-07-20 16:47:40,282 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 651 transitions. Word has length 470 [2020-07-20 16:47:40,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:40,282 INFO L479 AbstractCegarLoop]: Abstraction has 372 states and 651 transitions. [2020-07-20 16:47:40,283 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 16:47:40,283 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 651 transitions. [2020-07-20 16:47:40,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 16:47:40,286 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:40,287 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 17, 16, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 7, 6, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:40,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:40,502 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:40,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:40,503 INFO L82 PathProgramCache]: Analyzing trace with hash -1614185823, now seen corresponding path program 28 times [2020-07-20 16:47:40,503 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:40,503 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1747743037] [2020-07-20 16:47:40,504 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 16:47:40,992 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:47:40,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:40,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 554 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:47:40,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:41,126 INFO L134 CoverageAnalysis]: Checked inductivity of 2216 backedges. 94 proven. 558 refuted. 0 times theorem prover too weak. 1564 trivial. 0 not checked. [2020-07-20 16:47:41,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:42,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:43,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:43,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:44,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:44,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:44,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:44,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:44,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:44,322 INFO L134 CoverageAnalysis]: Checked inductivity of 2216 backedges. 94 proven. 582 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2020-07-20 16:47:44,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1747743037] [2020-07-20 16:47:44,322 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:44,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 16:47:44,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528128714] [2020-07-20 16:47:44,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 16:47:44,323 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:44,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 16:47:44,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:47:44,324 INFO L87 Difference]: Start difference. First operand 372 states and 651 transitions. Second operand 20 states. [2020-07-20 16:47:44,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:44,708 INFO L93 Difference]: Finished difference Result 391 states and 689 transitions. [2020-07-20 16:47:44,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:47:44,710 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 286 [2020-07-20 16:47:44,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:44,715 INFO L225 Difference]: With dead ends: 391 [2020-07-20 16:47:44,715 INFO L226 Difference]: Without dead ends: 387 [2020-07-20 16:47:44,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 539 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:47:44,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2020-07-20 16:47:44,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 381. [2020-07-20 16:47:44,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 381 states. [2020-07-20 16:47:44,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 381 states to 381 states and 674 transitions. [2020-07-20 16:47:44,740 INFO L78 Accepts]: Start accepts. Automaton has 381 states and 674 transitions. Word has length 286 [2020-07-20 16:47:44,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:44,741 INFO L479 AbstractCegarLoop]: Abstraction has 381 states and 674 transitions. [2020-07-20 16:47:44,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 16:47:44,741 INFO L276 IsEmpty]: Start isEmpty. Operand 381 states and 674 transitions. [2020-07-20 16:47:44,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-20 16:47:44,746 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:44,746 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 17, 16, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 8, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:44,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:44,961 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:44,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:44,962 INFO L82 PathProgramCache]: Analyzing trace with hash -417445322, now seen corresponding path program 29 times [2020-07-20 16:47:44,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:44,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [738043857] [2020-07-20 16:47:44,963 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 16:47:45,419 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:47:45,419 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:45,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:47:45,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:45,619 INFO L134 CoverageAnalysis]: Checked inductivity of 2856 backedges. 138 proven. 516 refuted. 0 times theorem prover too weak. 2202 trivial. 0 not checked. [2020-07-20 16:47:45,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:47,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:47,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:48,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:48,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:48,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:48,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:48,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:48,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:48,374 INFO L134 CoverageAnalysis]: Checked inductivity of 2856 backedges. 138 proven. 532 refuted. 0 times theorem prover too weak. 2186 trivial. 0 not checked. [2020-07-20 16:47:48,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [738043857] [2020-07-20 16:47:48,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:48,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:47:48,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960421889] [2020-07-20 16:47:48,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:47:48,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:48,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:47:48,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:47:48,376 INFO L87 Difference]: Start difference. First operand 381 states and 674 transitions. Second operand 18 states. [2020-07-20 16:47:48,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:48,688 INFO L93 Difference]: Finished difference Result 459 states and 877 transitions. [2020-07-20 16:47:48,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:47:48,689 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 322 [2020-07-20 16:47:48,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:48,694 INFO L225 Difference]: With dead ends: 459 [2020-07-20 16:47:48,694 INFO L226 Difference]: Without dead ends: 455 [2020-07-20 16:47:48,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 649 GetRequests, 615 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:47:48,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2020-07-20 16:47:48,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 402. [2020-07-20 16:47:48,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 402 states. [2020-07-20 16:47:48,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 728 transitions. [2020-07-20 16:47:48,724 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 728 transitions. Word has length 322 [2020-07-20 16:47:48,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:48,725 INFO L479 AbstractCegarLoop]: Abstraction has 402 states and 728 transitions. [2020-07-20 16:47:48,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:47:48,725 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 728 transitions. [2020-07-20 16:47:48,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2020-07-20 16:47:48,729 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:48,730 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 17, 16, 13, 13, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 10, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:48,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:48,944 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:48,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:48,944 INFO L82 PathProgramCache]: Analyzing trace with hash -420059642, now seen corresponding path program 30 times [2020-07-20 16:47:48,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:48,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1945696412] [2020-07-20 16:47:48,944 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 16:47:49,418 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:47:49,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:49,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:47:49,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:49,538 INFO L134 CoverageAnalysis]: Checked inductivity of 3332 backedges. 175 proven. 535 refuted. 0 times theorem prover too weak. 2622 trivial. 0 not checked. [2020-07-20 16:47:49,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:51,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:51,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:51,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:51,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:51,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:51,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:52,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:52,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:52,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:52,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:52,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:52,375 INFO L134 CoverageAnalysis]: Checked inductivity of 3332 backedges. 175 proven. 551 refuted. 0 times theorem prover too weak. 2606 trivial. 0 not checked. [2020-07-20 16:47:52,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1945696412] [2020-07-20 16:47:52,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:52,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:47:52,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722238113] [2020-07-20 16:47:52,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:47:52,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:52,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:47:52,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:47:52,377 INFO L87 Difference]: Start difference. First operand 402 states and 728 transitions. Second operand 18 states. [2020-07-20 16:47:52,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:52,730 INFO L93 Difference]: Finished difference Result 481 states and 932 transitions. [2020-07-20 16:47:52,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:47:52,731 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 346 [2020-07-20 16:47:52,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:52,736 INFO L225 Difference]: With dead ends: 481 [2020-07-20 16:47:52,737 INFO L226 Difference]: Without dead ends: 477 [2020-07-20 16:47:52,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 697 GetRequests, 663 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:47:52,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 477 states. [2020-07-20 16:47:52,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 477 to 402. [2020-07-20 16:47:52,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 402 states. [2020-07-20 16:47:52,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 728 transitions. [2020-07-20 16:47:52,757 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 728 transitions. Word has length 346 [2020-07-20 16:47:52,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:52,757 INFO L479 AbstractCegarLoop]: Abstraction has 402 states and 728 transitions. [2020-07-20 16:47:52,757 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:47:52,757 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 728 transitions. [2020-07-20 16:47:52,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-20 16:47:52,761 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:52,761 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 22, 22, 17, 16, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 8, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:52,975 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:52,976 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:52,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:52,977 INFO L82 PathProgramCache]: Analyzing trace with hash 1781713638, now seen corresponding path program 31 times [2020-07-20 16:47:52,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:52,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1880036431] [2020-07-20 16:47:52,978 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 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 16:47:53,452 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:47:53,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:53,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:47:53,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:53,614 INFO L134 CoverageAnalysis]: Checked inductivity of 2864 backedges. 234 proven. 416 refuted. 0 times theorem prover too weak. 2214 trivial. 0 not checked. [2020-07-20 16:47:53,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:47:55,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:55,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:55,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:55,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:55,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:55,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:55,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:55,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:55,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:56,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:47:56,314 INFO L134 CoverageAnalysis]: Checked inductivity of 2864 backedges. 236 proven. 430 refuted. 0 times theorem prover too weak. 2198 trivial. 0 not checked. [2020-07-20 16:47:56,314 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1880036431] [2020-07-20 16:47:56,314 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:47:56,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:47:56,315 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315345158] [2020-07-20 16:47:56,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:47:56,315 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:47:56,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:47:56,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:47:56,316 INFO L87 Difference]: Start difference. First operand 402 states and 728 transitions. Second operand 18 states. [2020-07-20 16:47:56,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:47:56,675 INFO L93 Difference]: Finished difference Result 423 states and 773 transitions. [2020-07-20 16:47:56,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:47:56,677 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 322 [2020-07-20 16:47:56,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:47:56,682 INFO L225 Difference]: With dead ends: 423 [2020-07-20 16:47:56,682 INFO L226 Difference]: Without dead ends: 419 [2020-07-20 16:47:56,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 649 GetRequests, 615 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 16:47:56,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2020-07-20 16:47:56,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 387. [2020-07-20 16:47:56,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 387 states. [2020-07-20 16:47:56,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 688 transitions. [2020-07-20 16:47:56,707 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 688 transitions. Word has length 322 [2020-07-20 16:47:56,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:47:56,708 INFO L479 AbstractCegarLoop]: Abstraction has 387 states and 688 transitions. [2020-07-20 16:47:56,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:47:56,708 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 688 transitions. [2020-07-20 16:47:56,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 391 [2020-07-20 16:47:56,712 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:47:56,713 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 27, 27, 21, 20, 15, 15, 15, 15, 15, 15, 15, 13, 13, 13, 13, 13, 13, 13, 10, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:47:56,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:47:56,926 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:47:56,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:47:56,927 INFO L82 PathProgramCache]: Analyzing trace with hash -1375015735, now seen corresponding path program 32 times [2020-07-20 16:47:56,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:47:56,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [363450431] [2020-07-20 16:47:56,928 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:47:57,416 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:47:57,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:47:57,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 586 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:47:57,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:47:57,689 INFO L134 CoverageAnalysis]: Checked inductivity of 4276 backedges. 2265 proven. 477 refuted. 0 times theorem prover too weak. 1534 trivial. 0 not checked. [2020-07-20 16:47:57,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:00,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:00,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:00,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:00,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:00,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:01,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:02,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:02,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:02,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:02,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:02,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:02,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:02,834 INFO L134 CoverageAnalysis]: Checked inductivity of 4276 backedges. 477 proven. 979 refuted. 0 times theorem prover too weak. 2820 trivial. 0 not checked. [2020-07-20 16:48:02,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [363450431] [2020-07-20 16:48:02,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:02,835 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-20 16:48:02,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306511267] [2020-07-20 16:48:02,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 16:48:02,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:02,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 16:48:02,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=613, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:48:02,836 INFO L87 Difference]: Start difference. First operand 387 states and 688 transitions. Second operand 27 states. [2020-07-20 16:48:04,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:04,396 INFO L93 Difference]: Finished difference Result 803 states and 1460 transitions. [2020-07-20 16:48:04,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 16:48:04,397 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 390 [2020-07-20 16:48:04,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:04,403 INFO L225 Difference]: With dead ends: 803 [2020-07-20 16:48:04,403 INFO L226 Difference]: Without dead ends: 422 [2020-07-20 16:48:04,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 798 GetRequests, 733 SyntacticMatches, 21 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=340, Invalid=1730, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 16:48:04,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 422 states. [2020-07-20 16:48:04,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 422 to 397. [2020-07-20 16:48:04,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 397 states. [2020-07-20 16:48:04,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 711 transitions. [2020-07-20 16:48:04,427 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 711 transitions. Word has length 390 [2020-07-20 16:48:04,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:04,427 INFO L479 AbstractCegarLoop]: Abstraction has 397 states and 711 transitions. [2020-07-20 16:48:04,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 16:48:04,428 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 711 transitions. [2020-07-20 16:48:04,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 403 [2020-07-20 16:48:04,432 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:04,433 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 28, 28, 21, 20, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 10, 8, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:04,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:04,648 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:04,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:04,649 INFO L82 PathProgramCache]: Analyzing trace with hash -61636868, now seen corresponding path program 33 times [2020-07-20 16:48:04,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:04,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [196897712] [2020-07-20 16:48:04,650 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 16:48:05,167 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:48:05,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:05,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:48:05,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:05,498 INFO L134 CoverageAnalysis]: Checked inductivity of 4556 backedges. 2401 proven. 529 refuted. 0 times theorem prover too weak. 1626 trivial. 0 not checked. [2020-07-20 16:48:05,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:09,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:09,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:09,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:09,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:09,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:09,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:09,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:11,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:11,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:11,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:12,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:12,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:12,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:12,331 INFO L134 CoverageAnalysis]: Checked inductivity of 4556 backedges. 538 proven. 1073 refuted. 0 times theorem prover too weak. 2945 trivial. 0 not checked. [2020-07-20 16:48:12,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [196897712] [2020-07-20 16:48:12,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:12,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-20 16:48:12,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462007823] [2020-07-20 16:48:12,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:48:12,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:12,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:48:12,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=713, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:48:12,333 INFO L87 Difference]: Start difference. First operand 397 states and 711 transitions. Second operand 29 states. [2020-07-20 16:48:13,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:13,952 INFO L93 Difference]: Finished difference Result 807 states and 1501 transitions. [2020-07-20 16:48:13,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 16:48:13,954 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 402 [2020-07-20 16:48:13,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:13,959 INFO L225 Difference]: With dead ends: 807 [2020-07-20 16:48:13,960 INFO L226 Difference]: Without dead ends: 415 [2020-07-20 16:48:13,963 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 753 SyntacticMatches, 23 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=373, Invalid=1979, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 16:48:13,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 415 states. [2020-07-20 16:48:13,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 415 to 374. [2020-07-20 16:48:13,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 374 states. [2020-07-20 16:48:13,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 638 transitions. [2020-07-20 16:48:13,981 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 638 transitions. Word has length 402 [2020-07-20 16:48:13,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:13,982 INFO L479 AbstractCegarLoop]: Abstraction has 374 states and 638 transitions. [2020-07-20 16:48:13,982 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:48:13,982 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 638 transitions. [2020-07-20 16:48:13,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 456 [2020-07-20 16:48:13,987 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:13,987 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 29, 29, 23, 23, 19, 19, 19, 19, 19, 19, 19, 15, 14, 14, 14, 14, 14, 14, 14, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:14,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:14,188 INFO L427 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:14,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:14,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1115658860, now seen corresponding path program 34 times [2020-07-20 16:48:14,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:14,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [65175196] [2020-07-20 16:48:14,190 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 16:48:14,755 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:48:14,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:14,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 679 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:48:14,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:15,104 INFO L134 CoverageAnalysis]: Checked inductivity of 5990 backedges. 806 proven. 1122 refuted. 0 times theorem prover too weak. 4062 trivial. 0 not checked. [2020-07-20 16:48:15,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:17,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:17,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:17,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:17,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:17,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:17,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:18,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:20,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:20,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:21,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:21,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:21,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:22,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:22,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:22,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:22,790 INFO L134 CoverageAnalysis]: Checked inductivity of 5990 backedges. 806 proven. 1156 refuted. 0 times theorem prover too weak. 4028 trivial. 0 not checked. [2020-07-20 16:48:22,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [65175196] [2020-07-20 16:48:22,791 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:22,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-20 16:48:22,791 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725902307] [2020-07-20 16:48:22,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 16:48:22,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:22,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 16:48:22,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=819, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:48:22,792 INFO L87 Difference]: Start difference. First operand 374 states and 638 transitions. Second operand 31 states. [2020-07-20 16:48:25,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:25,715 INFO L93 Difference]: Finished difference Result 817 states and 1463 transitions. [2020-07-20 16:48:25,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 16:48:25,718 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 455 [2020-07-20 16:48:25,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:25,725 INFO L225 Difference]: With dead ends: 817 [2020-07-20 16:48:25,725 INFO L226 Difference]: Without dead ends: 449 [2020-07-20 16:48:25,729 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 933 GetRequests, 855 SyntacticMatches, 25 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 634 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=468, Invalid=2502, Unknown=0, NotChecked=0, Total=2970 [2020-07-20 16:48:25,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2020-07-20 16:48:25,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 414. [2020-07-20 16:48:25,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2020-07-20 16:48:25,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 743 transitions. [2020-07-20 16:48:25,759 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 743 transitions. Word has length 455 [2020-07-20 16:48:25,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:25,759 INFO L479 AbstractCegarLoop]: Abstraction has 414 states and 743 transitions. [2020-07-20 16:48:25,759 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 16:48:25,760 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 743 transitions. [2020-07-20 16:48:25,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 432 [2020-07-20 16:48:25,766 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:25,766 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 23, 23, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 9, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:25,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:25,975 INFO L427 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:25,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:25,976 INFO L82 PathProgramCache]: Analyzing trace with hash -2054277352, now seen corresponding path program 35 times [2020-07-20 16:48:25,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:25,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1281782580] [2020-07-20 16:48:25,977 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 16:48:26,579 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:48:26,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:26,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 16:48:26,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:27,013 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 820 proven. 1072 refuted. 0 times theorem prover too weak. 3358 trivial. 0 not checked. [2020-07-20 16:48:27,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:30,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:30,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:30,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:30,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:30,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:31,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:31,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:34,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:34,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:34,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:35,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:35,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:35,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:36,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:36,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:36,334 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 820 proven. 1110 refuted. 0 times theorem prover too weak. 3320 trivial. 0 not checked. [2020-07-20 16:48:36,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1281782580] [2020-07-20 16:48:36,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:36,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-20 16:48:36,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950956443] [2020-07-20 16:48:36,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 16:48:36,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:36,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 16:48:36,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:48:36,336 INFO L87 Difference]: Start difference. First operand 414 states and 743 transitions. Second operand 33 states. [2020-07-20 16:48:38,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:38,859 INFO L93 Difference]: Finished difference Result 847 states and 1534 transitions. [2020-07-20 16:48:38,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-20 16:48:38,861 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 431 [2020-07-20 16:48:38,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:38,869 INFO L225 Difference]: With dead ends: 847 [2020-07-20 16:48:38,869 INFO L226 Difference]: Without dead ends: 439 [2020-07-20 16:48:38,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 886 GetRequests, 803 SyntacticMatches, 27 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 719 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=505, Invalid=2801, Unknown=0, NotChecked=0, Total=3306 [2020-07-20 16:48:38,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439 states. [2020-07-20 16:48:38,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439 to 382. [2020-07-20 16:48:38,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 382 states. [2020-07-20 16:48:38,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 614 transitions. [2020-07-20 16:48:38,904 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 614 transitions. Word has length 431 [2020-07-20 16:48:38,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:38,904 INFO L479 AbstractCegarLoop]: Abstraction has 382 states and 614 transitions. [2020-07-20 16:48:38,904 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 16:48:38,905 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 614 transitions. [2020-07-20 16:48:38,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 737 [2020-07-20 16:48:38,912 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:38,913 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 51, 51, 38, 37, 29, 29, 29, 29, 29, 29, 29, 25, 25, 25, 25, 25, 25, 25, 20, 14, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:39,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:39,127 INFO L427 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:39,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:39,128 INFO L82 PathProgramCache]: Analyzing trace with hash 1702588043, now seen corresponding path program 36 times [2020-07-20 16:48:39,128 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:39,129 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1096460323] [2020-07-20 16:48:39,129 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 16:48:39,823 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:48:39,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:39,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 1088 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:48:39,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:40,323 INFO L134 CoverageAnalysis]: Checked inductivity of 15905 backedges. 8569 proven. 967 refuted. 0 times theorem prover too weak. 6369 trivial. 0 not checked. [2020-07-20 16:48:40,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:46,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:46,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:46,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:46,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:46,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:46,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:48,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:48,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:49,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:49,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:49,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:49,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:49,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:49,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:50,061 INFO L134 CoverageAnalysis]: Checked inductivity of 15905 backedges. 789 proven. 2468 refuted. 0 times theorem prover too weak. 12648 trivial. 0 not checked. [2020-07-20 16:48:50,061 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1096460323] [2020-07-20 16:48:50,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:48:50,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-20 16:48:50,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908971785] [2020-07-20 16:48:50,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:48:50,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:48:50,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:48:50,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:48:50,063 INFO L87 Difference]: Start difference. First operand 382 states and 614 transitions. Second operand 29 states. [2020-07-20 16:48:52,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:48:52,832 INFO L93 Difference]: Finished difference Result 956 states and 1671 transitions. [2020-07-20 16:48:52,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 16:48:52,834 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 736 [2020-07-20 16:48:52,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:48:52,841 INFO L225 Difference]: With dead ends: 956 [2020-07-20 16:48:52,841 INFO L226 Difference]: Without dead ends: 518 [2020-07-20 16:48:52,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1498 GetRequests, 1421 SyntacticMatches, 23 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 619 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=496, Invalid=2584, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 16:48:52,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2020-07-20 16:48:52,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 430. [2020-07-20 16:48:52,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 430 states. [2020-07-20 16:48:52,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 705 transitions. [2020-07-20 16:48:52,865 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 705 transitions. Word has length 736 [2020-07-20 16:48:52,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:48:52,865 INFO L479 AbstractCegarLoop]: Abstraction has 430 states and 705 transitions. [2020-07-20 16:48:52,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:48:52,865 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 705 transitions. [2020-07-20 16:48:52,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 524 [2020-07-20 16:48:52,869 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:48:52,869 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 33, 33, 27, 27, 22, 22, 22, 22, 22, 22, 22, 17, 16, 16, 16, 16, 16, 16, 16, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:48:53,069 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:48:53,070 INFO L427 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:48:53,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:48:53,071 INFO L82 PathProgramCache]: Analyzing trace with hash -493126581, now seen corresponding path program 37 times [2020-07-20 16:48:53,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:48:53,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1150217852] [2020-07-20 16:48:53,071 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 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 16:48:53,773 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:48:53,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:48:53,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 1010 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:48:53,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:48:54,048 INFO L134 CoverageAnalysis]: Checked inductivity of 8002 backedges. 224 proven. 1283 refuted. 0 times theorem prover too weak. 6495 trivial. 0 not checked. [2020-07-20 16:48:54,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:48:58,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:59,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:48:59,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:00,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:00,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:01,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:01,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:01,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:01,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:01,389 INFO L134 CoverageAnalysis]: Checked inductivity of 8002 backedges. 224 proven. 1316 refuted. 0 times theorem prover too weak. 6462 trivial. 0 not checked. [2020-07-20 16:49:01,389 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1150217852] [2020-07-20 16:49:01,389 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:49:01,389 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 16:49:01,389 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818499506] [2020-07-20 16:49:01,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 16:49:01,390 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:49:01,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 16:49:01,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 16:49:01,391 INFO L87 Difference]: Start difference. First operand 430 states and 705 transitions. Second operand 22 states. [2020-07-20 16:49:02,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:49:02,018 INFO L93 Difference]: Finished difference Result 447 states and 742 transitions. [2020-07-20 16:49:02,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:49:02,020 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 523 [2020-07-20 16:49:02,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:49:02,026 INFO L225 Difference]: With dead ends: 447 [2020-07-20 16:49:02,026 INFO L226 Difference]: Without dead ends: 443 [2020-07-20 16:49:02,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1053 GetRequests, 1009 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:49:02,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2020-07-20 16:49:02,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 440. [2020-07-20 16:49:02,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 440 states. [2020-07-20 16:49:02,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 732 transitions. [2020-07-20 16:49:02,047 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 732 transitions. Word has length 523 [2020-07-20 16:49:02,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:49:02,048 INFO L479 AbstractCegarLoop]: Abstraction has 440 states and 732 transitions. [2020-07-20 16:49:02,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 16:49:02,048 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 732 transitions. [2020-07-20 16:49:02,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 693 [2020-07-20 16:49:02,054 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:49:02,054 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 49, 49, 34, 33, 27, 27, 27, 27, 27, 27, 27, 24, 24, 24, 24, 24, 24, 24, 21, 15, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:49:02,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:02,255 INFO L427 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:49:02,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:49:02,256 INFO L82 PathProgramCache]: Analyzing trace with hash 35531994, now seen corresponding path program 38 times [2020-07-20 16:49:02,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:49:02,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [904447235] [2020-07-20 16:49:02,257 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 16:49:02,994 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:49:02,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:49:02,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 1022 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 16:49:03,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:49:03,558 INFO L134 CoverageAnalysis]: Checked inductivity of 14025 backedges. 6536 proven. 1097 refuted. 0 times theorem prover too weak. 6392 trivial. 0 not checked. [2020-07-20 16:49:03,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:49:09,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:09,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:09,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:09,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:09,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:09,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:11,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:11,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:11,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:12,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:12,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:12,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:12,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:12,708 INFO L134 CoverageAnalysis]: Checked inductivity of 14025 backedges. 856 proven. 1927 refuted. 0 times theorem prover too weak. 11242 trivial. 0 not checked. [2020-07-20 16:49:12,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [904447235] [2020-07-20 16:49:12,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:49:12,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 27 [2020-07-20 16:49:12,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139978913] [2020-07-20 16:49:12,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 16:49:12,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:49:12,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 16:49:12,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:49:12,710 INFO L87 Difference]: Start difference. First operand 440 states and 732 transitions. Second operand 27 states. [2020-07-20 16:49:14,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:49:14,834 INFO L93 Difference]: Finished difference Result 1058 states and 1898 transitions. [2020-07-20 16:49:14,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 16:49:14,836 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 692 [2020-07-20 16:49:14,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:49:14,843 INFO L225 Difference]: With dead ends: 1058 [2020-07-20 16:49:14,843 INFO L226 Difference]: Without dead ends: 610 [2020-07-20 16:49:14,846 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1406 GetRequests, 1337 SyntacticMatches, 21 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=408, Invalid=2042, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 16:49:14,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2020-07-20 16:49:14,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 497. [2020-07-20 16:49:14,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 497 states. [2020-07-20 16:49:14,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 497 states to 497 states and 848 transitions. [2020-07-20 16:49:14,878 INFO L78 Accepts]: Start accepts. Automaton has 497 states and 848 transitions. Word has length 692 [2020-07-20 16:49:14,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:49:14,879 INFO L479 AbstractCegarLoop]: Abstraction has 497 states and 848 transitions. [2020-07-20 16:49:14,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 16:49:14,879 INFO L276 IsEmpty]: Start isEmpty. Operand 497 states and 848 transitions. [2020-07-20 16:49:14,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 512 [2020-07-20 16:49:14,883 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:49:14,883 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 35, 35, 27, 27, 20, 20, 20, 20, 20, 20, 20, 17, 17, 17, 17, 17, 17, 17, 13, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:49:15,084 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:15,084 INFO L427 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:49:15,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:49:15,085 INFO L82 PathProgramCache]: Analyzing trace with hash -697460650, now seen corresponding path program 39 times [2020-07-20 16:49:15,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:49:15,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [715799791] [2020-07-20 16:49:15,086 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 16:49:15,838 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:49:15,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:49:15,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 987 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:49:15,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:49:16,123 INFO L134 CoverageAnalysis]: Checked inductivity of 7506 backedges. 255 proven. 1022 refuted. 0 times theorem prover too weak. 6229 trivial. 0 not checked. [2020-07-20 16:49:16,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:49:19,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:19,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:21,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:21,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:22,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:22,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:22,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:22,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:22,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:22,817 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:22,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:23,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:23,206 INFO L134 CoverageAnalysis]: Checked inductivity of 7506 backedges. 255 proven. 1046 refuted. 0 times theorem prover too weak. 6205 trivial. 0 not checked. [2020-07-20 16:49:23,206 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [715799791] [2020-07-20 16:49:23,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:49:23,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 16:49:23,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885917208] [2020-07-20 16:49:23,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 16:49:23,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:49:23,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 16:49:23,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:49:23,208 INFO L87 Difference]: Start difference. First operand 497 states and 848 transitions. Second operand 20 states. [2020-07-20 16:49:23,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:49:23,766 INFO L93 Difference]: Finished difference Result 537 states and 949 transitions. [2020-07-20 16:49:23,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:49:23,768 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 511 [2020-07-20 16:49:23,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:49:23,774 INFO L225 Difference]: With dead ends: 537 [2020-07-20 16:49:23,774 INFO L226 Difference]: Without dead ends: 533 [2020-07-20 16:49:23,775 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1028 GetRequests, 989 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:49:23,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2020-07-20 16:49:23,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 497. [2020-07-20 16:49:23,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 497 states. [2020-07-20 16:49:23,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 497 states to 497 states and 848 transitions. [2020-07-20 16:49:23,807 INFO L78 Accepts]: Start accepts. Automaton has 497 states and 848 transitions. Word has length 511 [2020-07-20 16:49:23,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:49:23,808 INFO L479 AbstractCegarLoop]: Abstraction has 497 states and 848 transitions. [2020-07-20 16:49:23,808 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 16:49:23,808 INFO L276 IsEmpty]: Start isEmpty. Operand 497 states and 848 transitions. [2020-07-20 16:49:23,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 536 [2020-07-20 16:49:23,812 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:49:23,813 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 35, 35, 27, 27, 22, 22, 22, 22, 22, 22, 22, 17, 17, 17, 17, 17, 17, 17, 17, 10, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:49:24,013 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:24,014 INFO L427 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:49:24,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:49:24,015 INFO L82 PathProgramCache]: Analyzing trace with hash -1693605038, now seen corresponding path program 40 times [2020-07-20 16:49:24,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:49:24,015 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2004424981] [2020-07-20 16:49:24,016 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 16:49:24,804 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:49:24,804 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:49:24,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 1033 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:49:24,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:49:25,076 INFO L134 CoverageAnalysis]: Checked inductivity of 8334 backedges. 287 proven. 1050 refuted. 0 times theorem prover too weak. 6997 trivial. 0 not checked. [2020-07-20 16:49:25,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:49:28,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:28,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:29,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:30,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:30,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:31,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:31,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:31,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:31,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:31,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:31,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:31,760 INFO L134 CoverageAnalysis]: Checked inductivity of 8334 backedges. 287 proven. 1074 refuted. 0 times theorem prover too weak. 6973 trivial. 0 not checked. [2020-07-20 16:49:31,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2004424981] [2020-07-20 16:49:31,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:49:31,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 16:49:31,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739619796] [2020-07-20 16:49:31,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 16:49:31,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:49:31,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 16:49:31,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:49:31,762 INFO L87 Difference]: Start difference. First operand 497 states and 848 transitions. Second operand 20 states. [2020-07-20 16:49:32,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:49:32,340 INFO L93 Difference]: Finished difference Result 565 states and 1022 transitions. [2020-07-20 16:49:32,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:49:32,342 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 535 [2020-07-20 16:49:32,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:49:32,348 INFO L225 Difference]: With dead ends: 565 [2020-07-20 16:49:32,348 INFO L226 Difference]: Without dead ends: 561 [2020-07-20 16:49:32,349 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1076 GetRequests, 1037 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:49:32,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 561 states. [2020-07-20 16:49:32,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 561 to 504. [2020-07-20 16:49:32,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 504 states. [2020-07-20 16:49:32,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 874 transitions. [2020-07-20 16:49:32,373 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 874 transitions. Word has length 535 [2020-07-20 16:49:32,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:49:32,373 INFO L479 AbstractCegarLoop]: Abstraction has 504 states and 874 transitions. [2020-07-20 16:49:32,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 16:49:32,373 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 874 transitions. [2020-07-20 16:49:32,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 512 [2020-07-20 16:49:32,378 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:49:32,378 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 35, 35, 27, 27, 20, 20, 20, 20, 20, 20, 20, 17, 17, 17, 17, 17, 17, 17, 13, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:49:32,581 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:32,581 INFO L427 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:49:32,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:49:32,582 INFO L82 PathProgramCache]: Analyzing trace with hash -827294684, now seen corresponding path program 41 times [2020-07-20 16:49:32,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:49:32,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269041980] [2020-07-20 16:49:32,583 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 16:49:33,369 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:49:33,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:49:33,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 987 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:49:33,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:49:33,758 INFO L134 CoverageAnalysis]: Checked inductivity of 7506 backedges. 333 proven. 944 refuted. 0 times theorem prover too weak. 6229 trivial. 0 not checked. [2020-07-20 16:49:33,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:49:37,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:37,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:38,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:39,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:39,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:39,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:39,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:39,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:40,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:40,618 INFO L134 CoverageAnalysis]: Checked inductivity of 7506 backedges. 335 proven. 966 refuted. 0 times theorem prover too weak. 6205 trivial. 0 not checked. [2020-07-20 16:49:40,618 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269041980] [2020-07-20 16:49:40,618 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:49:40,618 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 16:49:40,619 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470744837] [2020-07-20 16:49:40,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 16:49:40,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:49:40,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 16:49:40,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:49:40,620 INFO L87 Difference]: Start difference. First operand 504 states and 874 transitions. Second operand 20 states. [2020-07-20 16:49:41,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:49:41,385 INFO L93 Difference]: Finished difference Result 603 states and 1162 transitions. [2020-07-20 16:49:41,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:49:41,388 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 511 [2020-07-20 16:49:41,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:49:41,394 INFO L225 Difference]: With dead ends: 603 [2020-07-20 16:49:41,395 INFO L226 Difference]: Without dead ends: 599 [2020-07-20 16:49:41,396 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1028 GetRequests, 989 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:49:41,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 599 states. [2020-07-20 16:49:41,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 599 to 507. [2020-07-20 16:49:41,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 507 states. [2020-07-20 16:49:41,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 507 states to 507 states and 880 transitions. [2020-07-20 16:49:41,422 INFO L78 Accepts]: Start accepts. Automaton has 507 states and 880 transitions. Word has length 511 [2020-07-20 16:49:41,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:49:41,422 INFO L479 AbstractCegarLoop]: Abstraction has 507 states and 880 transitions. [2020-07-20 16:49:41,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 16:49:41,422 INFO L276 IsEmpty]: Start isEmpty. Operand 507 states and 880 transitions. [2020-07-20 16:49:41,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 548 [2020-07-20 16:49:41,427 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:49:41,427 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 35, 35, 27, 27, 23, 23, 23, 23, 23, 23, 23, 19, 17, 17, 17, 17, 17, 17, 17, 10, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:49:41,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:41,628 INFO L427 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:49:41,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:49:41,629 INFO L82 PathProgramCache]: Analyzing trace with hash -1658513861, now seen corresponding path program 42 times [2020-07-20 16:49:41,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:49:41,630 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1719744282] [2020-07-20 16:49:41,630 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 16:49:42,447 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:49:42,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:49:42,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 1057 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:49:42,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:49:42,693 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 341 proven. 862 refuted. 0 times theorem prover too weak. 7575 trivial. 0 not checked. [2020-07-20 16:49:42,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:49:46,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:47,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:48,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:48,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:48,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:48,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:48,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:48,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:48,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:49,370 INFO L134 CoverageAnalysis]: Checked inductivity of 8778 backedges. 341 proven. 878 refuted. 0 times theorem prover too weak. 7559 trivial. 0 not checked. [2020-07-20 16:49:49,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1719744282] [2020-07-20 16:49:49,371 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:49:49,371 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:49:49,371 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058331269] [2020-07-20 16:49:49,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:49:49,372 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:49:49,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:49:49,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:49:49,372 INFO L87 Difference]: Start difference. First operand 507 states and 880 transitions. Second operand 18 states. [2020-07-20 16:49:49,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:49:49,918 INFO L93 Difference]: Finished difference Result 624 states and 1225 transitions. [2020-07-20 16:49:49,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:49:49,920 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 547 [2020-07-20 16:49:49,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:49:49,928 INFO L225 Difference]: With dead ends: 624 [2020-07-20 16:49:49,929 INFO L226 Difference]: Without dead ends: 620 [2020-07-20 16:49:49,930 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1099 GetRequests, 1065 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:49:49,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 620 states. [2020-07-20 16:49:49,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 620 to 510. [2020-07-20 16:49:49,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 510 states. [2020-07-20 16:49:49,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 510 states to 510 states and 895 transitions. [2020-07-20 16:49:49,956 INFO L78 Accepts]: Start accepts. Automaton has 510 states and 895 transitions. Word has length 547 [2020-07-20 16:49:49,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:49:49,956 INFO L479 AbstractCegarLoop]: Abstraction has 510 states and 895 transitions. [2020-07-20 16:49:49,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:49:49,957 INFO L276 IsEmpty]: Start isEmpty. Operand 510 states and 895 transitions. [2020-07-20 16:49:49,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 560 [2020-07-20 16:49:49,962 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:49:49,962 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 37, 37, 27, 27, 23, 23, 23, 23, 23, 23, 23, 19, 18, 18, 18, 18, 18, 18, 18, 10, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:49:50,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:49:50,164 INFO L427 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:49:50,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:49:50,165 INFO L82 PathProgramCache]: Analyzing trace with hash -232415006, now seen corresponding path program 43 times [2020-07-20 16:49:50,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:49:50,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [675110013] [2020-07-20 16:49:50,166 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 16:49:50,986 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:49:50,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:49:50,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 1080 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:49:50,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:49:51,268 INFO L134 CoverageAnalysis]: Checked inductivity of 9130 backedges. 484 proven. 919 refuted. 0 times theorem prover too weak. 7727 trivial. 0 not checked. [2020-07-20 16:49:51,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:49:55,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:57,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:57,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:58,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:58,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:58,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:58,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:58,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:49:59,441 INFO L134 CoverageAnalysis]: Checked inductivity of 9130 backedges. 486 proven. 941 refuted. 0 times theorem prover too weak. 7703 trivial. 0 not checked. [2020-07-20 16:49:59,441 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [675110013] [2020-07-20 16:49:59,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:49:59,441 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 16:49:59,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71730631] [2020-07-20 16:49:59,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 16:49:59,442 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:49:59,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 16:49:59,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:49:59,443 INFO L87 Difference]: Start difference. First operand 510 states and 895 transitions. Second operand 20 states. [2020-07-20 16:50:00,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:50:00,074 INFO L93 Difference]: Finished difference Result 530 states and 937 transitions. [2020-07-20 16:50:00,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:50:00,076 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 559 [2020-07-20 16:50:00,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:50:00,083 INFO L225 Difference]: With dead ends: 530 [2020-07-20 16:50:00,083 INFO L226 Difference]: Without dead ends: 526 [2020-07-20 16:50:00,084 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1124 GetRequests, 1085 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:50:00,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 526 states. [2020-07-20 16:50:00,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 526 to 505. [2020-07-20 16:50:00,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 505 states. [2020-07-20 16:50:00,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 505 states to 505 states and 885 transitions. [2020-07-20 16:50:00,107 INFO L78 Accepts]: Start accepts. Automaton has 505 states and 885 transitions. Word has length 559 [2020-07-20 16:50:00,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:50:00,108 INFO L479 AbstractCegarLoop]: Abstraction has 505 states and 885 transitions. [2020-07-20 16:50:00,108 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 16:50:00,108 INFO L276 IsEmpty]: Start isEmpty. Operand 505 states and 885 transitions. [2020-07-20 16:50:00,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 881 [2020-07-20 16:50:00,115 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:50:00,116 INFO L422 BasicCegarLoop]: trace histogram [68, 68, 65, 65, 38, 37, 34, 34, 34, 34, 34, 34, 34, 32, 32, 32, 32, 32, 32, 32, 30, 28, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:50:00,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:00,317 INFO L427 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:50:00,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:50:00,318 INFO L82 PathProgramCache]: Analyzing trace with hash -883603397, now seen corresponding path program 44 times [2020-07-20 16:50:00,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:50:00,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1348665468] [2020-07-20 16:50:00,319 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 16:50:01,267 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:50:01,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:50:01,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 1290 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:50:01,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:50:01,924 INFO L134 CoverageAnalysis]: Checked inductivity of 23029 backedges. 12318 proven. 733 refuted. 0 times theorem prover too weak. 9978 trivial. 0 not checked. [2020-07-20 16:50:01,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:50:10,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:10,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:11,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:11,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:11,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:12,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:12,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:12,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:12,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:13,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:13,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:13,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:13,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:14,536 INFO L134 CoverageAnalysis]: Checked inductivity of 23029 backedges. 1172 proven. 2135 refuted. 0 times theorem prover too weak. 19722 trivial. 0 not checked. [2020-07-20 16:50:14,537 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1348665468] [2020-07-20 16:50:14,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:50:14,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-20 16:50:14,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859398181] [2020-07-20 16:50:14,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 16:50:14,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:50:14,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 16:50:14,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-20 16:50:14,538 INFO L87 Difference]: Start difference. First operand 505 states and 885 transitions. Second operand 25 states. [2020-07-20 16:50:16,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:50:16,996 INFO L93 Difference]: Finished difference Result 1220 states and 2295 transitions. [2020-07-20 16:50:16,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 16:50:16,998 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 880 [2020-07-20 16:50:16,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:50:17,005 INFO L225 Difference]: With dead ends: 1220 [2020-07-20 16:50:17,006 INFO L226 Difference]: Without dead ends: 637 [2020-07-20 16:50:17,009 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1781 GetRequests, 1717 SyntacticMatches, 19 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=355, Invalid=1807, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 16:50:17,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 637 states. [2020-07-20 16:50:17,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 637 to 522. [2020-07-20 16:50:17,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 522 states. [2020-07-20 16:50:17,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 522 states to 522 states and 926 transitions. [2020-07-20 16:50:17,036 INFO L78 Accepts]: Start accepts. Automaton has 522 states and 926 transitions. Word has length 880 [2020-07-20 16:50:17,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:50:17,036 INFO L479 AbstractCegarLoop]: Abstraction has 522 states and 926 transitions. [2020-07-20 16:50:17,037 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 16:50:17,037 INFO L276 IsEmpty]: Start isEmpty. Operand 522 states and 926 transitions. [2020-07-20 16:50:17,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 608 [2020-07-20 16:50:17,041 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:50:17,041 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 43, 43, 27, 27, 24, 24, 24, 24, 24, 24, 24, 21, 21, 21, 21, 21, 21, 21, 21, 16, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:50:17,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:17,242 INFO L427 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:50:17,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:50:17,243 INFO L82 PathProgramCache]: Analyzing trace with hash 1628116516, now seen corresponding path program 45 times [2020-07-20 16:50:17,243 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:50:17,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [155222445] [2020-07-20 16:50:17,244 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 16:50:18,121 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:50:18,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:50:18,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:50:18,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:50:18,492 INFO L134 CoverageAnalysis]: Checked inductivity of 10770 backedges. 500 proven. 837 refuted. 0 times theorem prover too weak. 9433 trivial. 0 not checked. [2020-07-20 16:50:18,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:50:23,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:23,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:24,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:25,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:25,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:25,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:25,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:25,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:25,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:25,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:26,555 INFO L134 CoverageAnalysis]: Checked inductivity of 10770 backedges. 502 proven. 851 refuted. 0 times theorem prover too weak. 9417 trivial. 0 not checked. [2020-07-20 16:50:26,555 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [155222445] [2020-07-20 16:50:26,555 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:50:26,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:50:26,556 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214692024] [2020-07-20 16:50:26,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:50:26,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:50:26,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:50:26,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:50:26,557 INFO L87 Difference]: Start difference. First operand 522 states and 926 transitions. Second operand 18 states. [2020-07-20 16:50:26,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:50:26,936 INFO L93 Difference]: Finished difference Result 584 states and 1086 transitions. [2020-07-20 16:50:26,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:50:26,937 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 607 [2020-07-20 16:50:26,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:50:26,944 INFO L225 Difference]: With dead ends: 584 [2020-07-20 16:50:26,944 INFO L226 Difference]: Without dead ends: 580 [2020-07-20 16:50:26,945 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1219 GetRequests, 1185 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:50:26,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2020-07-20 16:50:26,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 517. [2020-07-20 16:50:26,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 517 states. [2020-07-20 16:50:26,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 517 states to 517 states and 915 transitions. [2020-07-20 16:50:26,967 INFO L78 Accepts]: Start accepts. Automaton has 517 states and 915 transitions. Word has length 607 [2020-07-20 16:50:26,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:50:26,967 INFO L479 AbstractCegarLoop]: Abstraction has 517 states and 915 transitions. [2020-07-20 16:50:26,967 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:50:26,967 INFO L276 IsEmpty]: Start isEmpty. Operand 517 states and 915 transitions. [2020-07-20 16:50:26,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 560 [2020-07-20 16:50:26,971 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:50:26,971 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 41, 41, 27, 27, 21, 21, 21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 20, 20, 15, 14, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:50:27,172 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:27,172 INFO L427 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:50:27,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:50:27,173 INFO L82 PathProgramCache]: Analyzing trace with hash 193492518, now seen corresponding path program 46 times [2020-07-20 16:50:27,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:50:27,174 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [398000328] [2020-07-20 16:50:27,174 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 16:50:28,067 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:50:28,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:50:28,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 1080 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 16:50:28,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:50:28,385 INFO L134 CoverageAnalysis]: Checked inductivity of 9026 backedges. 738 proven. 677 refuted. 0 times theorem prover too weak. 7611 trivial. 0 not checked. [2020-07-20 16:50:28,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:50:33,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:33,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:34,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:34,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:34,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:34,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:35,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:35,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:35,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:35,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:35,669 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:36,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:37,180 INFO L134 CoverageAnalysis]: Checked inductivity of 9026 backedges. 742 proven. 697 refuted. 0 times theorem prover too weak. 7587 trivial. 0 not checked. [2020-07-20 16:50:37,181 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [398000328] [2020-07-20 16:50:37,181 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:50:37,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 16:50:37,181 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092823372] [2020-07-20 16:50:37,182 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 16:50:37,182 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:50:37,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 16:50:37,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 16:50:37,183 INFO L87 Difference]: Start difference. First operand 517 states and 915 transitions. Second operand 20 states. [2020-07-20 16:50:37,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:50:37,929 INFO L93 Difference]: Finished difference Result 527 states and 933 transitions. [2020-07-20 16:50:37,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:50:37,933 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 559 [2020-07-20 16:50:37,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:50:37,939 INFO L225 Difference]: With dead ends: 527 [2020-07-20 16:50:37,939 INFO L226 Difference]: Without dead ends: 523 [2020-07-20 16:50:37,940 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1124 GetRequests, 1085 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 16:50:37,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2020-07-20 16:50:37,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 512. [2020-07-20 16:50:37,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 512 states. [2020-07-20 16:50:37,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 903 transitions. [2020-07-20 16:50:37,963 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 903 transitions. Word has length 559 [2020-07-20 16:50:37,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:50:37,964 INFO L479 AbstractCegarLoop]: Abstraction has 512 states and 903 transitions. [2020-07-20 16:50:37,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 16:50:37,964 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 903 transitions. [2020-07-20 16:50:37,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 985 [2020-07-20 16:50:37,975 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:50:37,976 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 74, 74, 42, 41, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 34, 32, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:50:38,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:50:38,191 INFO L427 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:50:38,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:50:38,192 INFO L82 PathProgramCache]: Analyzing trace with hash -956074985, now seen corresponding path program 47 times [2020-07-20 16:50:38,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:50:38,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1096326978] [2020-07-20 16:50:38,193 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 16:50:39,160 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:50:39,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:50:39,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 1443 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:50:39,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:50:40,025 INFO L134 CoverageAnalysis]: Checked inductivity of 28913 backedges. 15345 proven. 1377 refuted. 0 times theorem prover too weak. 12191 trivial. 0 not checked. [2020-07-20 16:50:40,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:50:48,515 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:50:51,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:52,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:52,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:53,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:53,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:53,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:53,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:50:59,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:01,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:01,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:02,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:02,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:02,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:02,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:03,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:03,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:03,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:03,740 INFO L134 CoverageAnalysis]: Checked inductivity of 28913 backedges. 966 proven. 3826 refuted. 0 times theorem prover too weak. 24121 trivial. 0 not checked. [2020-07-20 16:51:03,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1096326978] [2020-07-20 16:51:03,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:03,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 27] total 31 [2020-07-20 16:51:03,742 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707380465] [2020-07-20 16:51:03,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 16:51:03,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:03,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 16:51:03,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=821, Unknown=0, NotChecked=0, Total=930 [2020-07-20 16:51:03,744 INFO L87 Difference]: Start difference. First operand 512 states and 903 transitions. Second operand 31 states. [2020-07-20 16:51:07,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:07,222 INFO L93 Difference]: Finished difference Result 1085 states and 2091 transitions. [2020-07-20 16:51:07,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 16:51:07,226 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 984 [2020-07-20 16:51:07,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:07,234 INFO L225 Difference]: With dead ends: 1085 [2020-07-20 16:51:07,234 INFO L226 Difference]: Without dead ends: 569 [2020-07-20 16:51:07,239 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1992 GetRequests, 1913 SyntacticMatches, 25 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 624 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=484, Invalid=2596, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 16:51:07,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 569 states. [2020-07-20 16:51:07,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 569 to 421. [2020-07-20 16:51:07,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 421 states. [2020-07-20 16:51:07,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 421 states to 421 states and 695 transitions. [2020-07-20 16:51:07,264 INFO L78 Accepts]: Start accepts. Automaton has 421 states and 695 transitions. Word has length 984 [2020-07-20 16:51:07,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:07,264 INFO L479 AbstractCegarLoop]: Abstraction has 421 states and 695 transitions. [2020-07-20 16:51:07,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 16:51:07,265 INFO L276 IsEmpty]: Start isEmpty. Operand 421 states and 695 transitions. [2020-07-20 16:51:07,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 789 [2020-07-20 16:51:07,274 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:07,274 INFO L422 BasicCegarLoop]: trace histogram [62, 62, 57, 57, 34, 33, 31, 31, 31, 31, 31, 31, 31, 28, 28, 28, 28, 28, 28, 28, 28, 24, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:07,480 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:07,480 INFO L427 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:07,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:07,481 INFO L82 PathProgramCache]: Analyzing trace with hash -376153154, now seen corresponding path program 48 times [2020-07-20 16:51:07,482 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:07,482 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1533283960] [2020-07-20 16:51:07,483 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 16:51:08,449 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:51:08,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:08,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 1158 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:51:08,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:09,332 INFO L134 CoverageAnalysis]: Checked inductivity of 18409 backedges. 1820 proven. 1484 refuted. 0 times theorem prover too weak. 15105 trivial. 0 not checked. [2020-07-20 16:51:09,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:16,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:16,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:17,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:17,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:17,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:18,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:18,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:18,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:20,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:20,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:21,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:21,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:21,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:21,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:22,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:23,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:25,798 INFO L134 CoverageAnalysis]: Checked inductivity of 18409 backedges. 1824 proven. 1508 refuted. 0 times theorem prover too weak. 15077 trivial. 0 not checked. [2020-07-20 16:51:25,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1533283960] [2020-07-20 16:51:25,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:25,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-20 16:51:25,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770445463] [2020-07-20 16:51:25,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:51:25,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:25,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:51:25,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:51:25,801 INFO L87 Difference]: Start difference. First operand 421 states and 695 transitions. Second operand 29 states. [2020-07-20 16:51:31,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:31,475 INFO L93 Difference]: Finished difference Result 1092 states and 2032 transitions. [2020-07-20 16:51:31,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-20 16:51:31,477 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 788 [2020-07-20 16:51:31,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:31,484 INFO L225 Difference]: With dead ends: 1092 [2020-07-20 16:51:31,485 INFO L226 Difference]: Without dead ends: 600 [2020-07-20 16:51:31,489 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1602 GetRequests, 1525 SyntacticMatches, 23 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 626 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=471, Invalid=2609, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 16:51:31,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 600 states. [2020-07-20 16:51:31,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 600 to 514. [2020-07-20 16:51:31,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2020-07-20 16:51:31,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 917 transitions. [2020-07-20 16:51:31,512 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 917 transitions. Word has length 788 [2020-07-20 16:51:31,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:31,513 INFO L479 AbstractCegarLoop]: Abstraction has 514 states and 917 transitions. [2020-07-20 16:51:31,513 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:51:31,513 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 917 transitions. [2020-07-20 16:51:31,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 596 [2020-07-20 16:51:31,518 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:31,518 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 43, 43, 27, 27, 23, 23, 23, 23, 23, 23, 23, 21, 21, 21, 21, 21, 21, 21, 19, 16, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:31,719 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:31,719 INFO L427 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:31,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:31,720 INFO L82 PathProgramCache]: Analyzing trace with hash -2026573057, now seen corresponding path program 49 times [2020-07-20 16:51:31,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:31,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [684523902] [2020-07-20 16:51:31,721 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 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 16:51:32,689 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:51:32,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:32,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 1150 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:51:32,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:33,062 INFO L134 CoverageAnalysis]: Checked inductivity of 10306 backedges. 697 proven. 608 refuted. 0 times theorem prover too weak. 9001 trivial. 0 not checked. [2020-07-20 16:51:33,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:40,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:40,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:41,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:41,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:42,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:42,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:42,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:42,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:42,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:44,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:47,307 INFO L134 CoverageAnalysis]: Checked inductivity of 10306 backedges. 697 proven. 626 refuted. 0 times theorem prover too weak. 8983 trivial. 0 not checked. [2020-07-20 16:51:47,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [684523902] [2020-07-20 16:51:47,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:51:47,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:51:47,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208635009] [2020-07-20 16:51:47,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:51:47,310 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:51:47,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:51:47,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:51:47,310 INFO L87 Difference]: Start difference. First operand 514 states and 917 transitions. Second operand 18 states. [2020-07-20 16:51:48,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:51:48,125 INFO L93 Difference]: Finished difference Result 547 states and 986 transitions. [2020-07-20 16:51:48,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:51:48,130 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 595 [2020-07-20 16:51:48,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:51:48,139 INFO L225 Difference]: With dead ends: 547 [2020-07-20 16:51:48,139 INFO L226 Difference]: Without dead ends: 543 [2020-07-20 16:51:48,141 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1195 GetRequests, 1161 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:51:48,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 543 states. [2020-07-20 16:51:48,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 543 to 532. [2020-07-20 16:51:48,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 532 states. [2020-07-20 16:51:48,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 955 transitions. [2020-07-20 16:51:48,169 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 955 transitions. Word has length 595 [2020-07-20 16:51:48,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:51:48,170 INFO L479 AbstractCegarLoop]: Abstraction has 532 states and 955 transitions. [2020-07-20 16:51:48,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:51:48,170 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 955 transitions. [2020-07-20 16:51:48,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 777 [2020-07-20 16:51:48,176 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:51:48,176 INFO L422 BasicCegarLoop]: trace histogram [59, 59, 58, 58, 34, 33, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 26, 24, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:51:48,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:51:48,377 INFO L427 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:51:48,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:51:48,378 INFO L82 PathProgramCache]: Analyzing trace with hash 185550419, now seen corresponding path program 50 times [2020-07-20 16:51:48,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:51:48,379 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2130842572] [2020-07-20 16:51:48,379 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 16:51:49,423 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:51:49,424 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:51:49,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 1141 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:51:49,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:51:50,106 INFO L134 CoverageAnalysis]: Checked inductivity of 17793 backedges. 1906 proven. 1344 refuted. 0 times theorem prover too weak. 14543 trivial. 0 not checked. [2020-07-20 16:51:50,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:51:59,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:51:59,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:01,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:02,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:02,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:02,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:03,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:03,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:06,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:06,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:06,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:06,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:06,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:06,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:06,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:08,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:11,151 INFO L134 CoverageAnalysis]: Checked inductivity of 17793 backedges. 1914 proven. 1362 refuted. 0 times theorem prover too weak. 14517 trivial. 0 not checked. [2020-07-20 16:52:11,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2130842572] [2020-07-20 16:52:11,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:11,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 25] total 29 [2020-07-20 16:52:11,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [342071110] [2020-07-20 16:52:11,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 16:52:11,153 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:11,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 16:52:11,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2020-07-20 16:52:11,153 INFO L87 Difference]: Start difference. First operand 532 states and 955 transitions. Second operand 29 states. [2020-07-20 16:52:16,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:16,575 INFO L93 Difference]: Finished difference Result 1204 states and 2288 transitions. [2020-07-20 16:52:16,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 16:52:16,581 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 776 [2020-07-20 16:52:16,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:16,591 INFO L225 Difference]: With dead ends: 1204 [2020-07-20 16:52:16,592 INFO L226 Difference]: Without dead ends: 636 [2020-07-20 16:52:16,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1575 GetRequests, 1501 SyntacticMatches, 23 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=434, Invalid=2322, Unknown=0, NotChecked=0, Total=2756 [2020-07-20 16:52:16,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 636 states. [2020-07-20 16:52:16,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 636 to 541. [2020-07-20 16:52:16,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 541 states. [2020-07-20 16:52:16,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 541 states to 541 states and 972 transitions. [2020-07-20 16:52:16,633 INFO L78 Accepts]: Start accepts. Automaton has 541 states and 972 transitions. Word has length 776 [2020-07-20 16:52:16,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:16,634 INFO L479 AbstractCegarLoop]: Abstraction has 541 states and 972 transitions. [2020-07-20 16:52:16,634 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 16:52:16,634 INFO L276 IsEmpty]: Start isEmpty. Operand 541 states and 972 transitions. [2020-07-20 16:52:16,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 608 [2020-07-20 16:52:16,638 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:16,639 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 45, 45, 27, 27, 23, 23, 23, 23, 23, 23, 23, 22, 22, 22, 22, 22, 22, 22, 19, 18, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:16,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:16,840 INFO L427 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:16,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:16,841 INFO L82 PathProgramCache]: Analyzing trace with hash -847147464, now seen corresponding path program 51 times [2020-07-20 16:52:16,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:16,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [763780383] [2020-07-20 16:52:16,842 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 16:52:17,939 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:17,940 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:17,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 16:52:17,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:18,325 INFO L134 CoverageAnalysis]: Checked inductivity of 10738 backedges. 760 proven. 573 refuted. 0 times theorem prover too weak. 9405 trivial. 0 not checked. [2020-07-20 16:52:18,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:22,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:22,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:23,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:23,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:23,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:23,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:23,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:24,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:24,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:24,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:25,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:27,637 INFO L134 CoverageAnalysis]: Checked inductivity of 10738 backedges. 764 proven. 585 refuted. 0 times theorem prover too weak. 9389 trivial. 0 not checked. [2020-07-20 16:52:27,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [763780383] [2020-07-20 16:52:27,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:27,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 16:52:27,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498165714] [2020-07-20 16:52:27,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:52:27,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:27,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:52:27,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 16:52:27,640 INFO L87 Difference]: Start difference. First operand 541 states and 972 transitions. Second operand 18 states. [2020-07-20 16:52:28,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:28,434 INFO L93 Difference]: Finished difference Result 552 states and 989 transitions. [2020-07-20 16:52:28,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:52:28,438 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 607 [2020-07-20 16:52:28,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:28,446 INFO L225 Difference]: With dead ends: 552 [2020-07-20 16:52:28,446 INFO L226 Difference]: Without dead ends: 548 [2020-07-20 16:52:28,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1219 GetRequests, 1185 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:52:28,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 548 states. [2020-07-20 16:52:28,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 548 to 513. [2020-07-20 16:52:28,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 513 states. [2020-07-20 16:52:28,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 513 states to 513 states and 892 transitions. [2020-07-20 16:52:28,476 INFO L78 Accepts]: Start accepts. Automaton has 513 states and 892 transitions. Word has length 607 [2020-07-20 16:52:28,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:28,477 INFO L479 AbstractCegarLoop]: Abstraction has 513 states and 892 transitions. [2020-07-20 16:52:28,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:52:28,477 INFO L276 IsEmpty]: Start isEmpty. Operand 513 states and 892 transitions. [2020-07-20 16:52:28,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 797 [2020-07-20 16:52:28,483 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:28,484 INFO L422 BasicCegarLoop]: trace histogram [72, 72, 47, 47, 38, 37, 36, 36, 36, 36, 36, 36, 36, 35, 23, 23, 23, 23, 23, 23, 23, 14, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:28,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:28,685 INFO L427 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:28,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:28,686 INFO L82 PathProgramCache]: Analyzing trace with hash -499938684, now seen corresponding path program 52 times [2020-07-20 16:52:28,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:28,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [248425610] [2020-07-20 16:52:28,687 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:52:29,738 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:52:29,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:29,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 1176 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 16:52:29,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:30,583 INFO L134 CoverageAnalysis]: Checked inductivity of 19449 backedges. 1779 proven. 2128 refuted. 0 times theorem prover too weak. 15542 trivial. 0 not checked. [2020-07-20 16:52:30,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:37,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:37,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:38,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:38,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:39,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:39,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:39,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:39,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:39,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:44,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:47,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:49,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:50,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:50,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:50,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:50,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:50,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:50,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:51,398 INFO L134 CoverageAnalysis]: Checked inductivity of 19449 backedges. 1783 proven. 2164 refuted. 0 times theorem prover too weak. 15502 trivial. 0 not checked. [2020-07-20 16:52:51,398 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [248425610] [2020-07-20 16:52:51,398 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:51,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 33 [2020-07-20 16:52:51,399 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625294895] [2020-07-20 16:52:51,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 16:52:51,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:51,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 16:52:51,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:52:51,400 INFO L87 Difference]: Start difference. First operand 513 states and 892 transitions. Second operand 33 states. [2020-07-20 16:52:56,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:56,879 INFO L93 Difference]: Finished difference Result 1142 states and 2110 transitions. [2020-07-20 16:52:56,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 16:52:56,884 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 796 [2020-07-20 16:52:56,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:56,905 INFO L225 Difference]: With dead ends: 1142 [2020-07-20 16:52:56,905 INFO L226 Difference]: Without dead ends: 630 [2020-07-20 16:52:56,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1617 GetRequests, 1533 SyntacticMatches, 27 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 746 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=517, Invalid=2905, Unknown=0, NotChecked=0, Total=3422 [2020-07-20 16:52:56,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 630 states. [2020-07-20 16:52:56,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 630 to 541. [2020-07-20 16:52:56,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 541 states. [2020-07-20 16:52:56,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 541 states to 541 states and 917 transitions. [2020-07-20 16:52:56,946 INFO L78 Accepts]: Start accepts. Automaton has 541 states and 917 transitions. Word has length 796 [2020-07-20 16:52:56,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:56,947 INFO L479 AbstractCegarLoop]: Abstraction has 541 states and 917 transitions. [2020-07-20 16:52:56,947 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 16:52:56,947 INFO L276 IsEmpty]: Start isEmpty. Operand 541 states and 917 transitions. [2020-07-20 16:52:56,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1071 [2020-07-20 16:52:56,956 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:56,956 INFO L422 BasicCegarLoop]: trace histogram [86, 86, 73, 73, 55, 54, 43, 43, 43, 43, 43, 43, 43, 36, 36, 36, 36, 36, 36, 36, 32, 18, 18, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:57,156 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:57,157 INFO L427 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:57,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:57,158 INFO L82 PathProgramCache]: Analyzing trace with hash 312891350, now seen corresponding path program 53 times [2020-07-20 16:52:57,159 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:57,159 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [770647677] [2020-07-20 16:52:57,159 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 16:52:58,236 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 16:52:58,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:58,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 848 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 16:52:58,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:59,399 INFO L134 CoverageAnalysis]: Checked inductivity of 34180 backedges. 12859 proven. 3351 refuted. 0 times theorem prover too weak. 17970 trivial. 0 not checked. [2020-07-20 16:52:59,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:04,251 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 16:53:18,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:20,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:20,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:22,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:23,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:24,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:24,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:24,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:24,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:24,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:30,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:30,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:32,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:33,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:33,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:33,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:34,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:34,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:34,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:34,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:53:35,223 INFO L134 CoverageAnalysis]: Checked inductivity of 34180 backedges. 1677 proven. 4791 refuted. 0 times theorem prover too weak. 27712 trivial. 0 not checked. [2020-07-20 16:53:35,223 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [770647677] [2020-07-20 16:53:35,224 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:53:35,224 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 33] total 39 [2020-07-20 16:53:35,224 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593584875] [2020-07-20 16:53:35,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-20 16:53:35,225 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:53:35,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-20 16:53:35,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1329, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 16:53:35,226 INFO L87 Difference]: Start difference. First operand 541 states and 917 transitions. Second operand 39 states. [2020-07-20 16:53:43,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:53:43,538 INFO L93 Difference]: Finished difference Result 1330 states and 2437 transitions. [2020-07-20 16:53:43,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-20 16:53:43,541 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 1070 [2020-07-20 16:53:43,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:53:43,553 INFO L225 Difference]: With dead ends: 1330 [2020-07-20 16:53:43,553 INFO L226 Difference]: Without dead ends: 795 [2020-07-20 16:53:43,557 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2177 GetRequests, 2073 SyntacticMatches, 29 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1366 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=835, Invalid=5017, Unknown=0, NotChecked=0, Total=5852 [2020-07-20 16:53:43,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 795 states. [2020-07-20 16:53:43,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 795 to 705. [2020-07-20 16:53:43,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 705 states. [2020-07-20 16:53:43,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 705 states to 705 states and 1230 transitions. [2020-07-20 16:53:43,599 INFO L78 Accepts]: Start accepts. Automaton has 705 states and 1230 transitions. Word has length 1070 [2020-07-20 16:53:43,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:53:43,599 INFO L479 AbstractCegarLoop]: Abstraction has 705 states and 1230 transitions. [2020-07-20 16:53:43,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-20 16:53:43,600 INFO L276 IsEmpty]: Start isEmpty. Operand 705 states and 1230 transitions. [2020-07-20 16:53:43,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1168 [2020-07-20 16:53:43,617 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:53:43,617 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 85, 85, 61, 61, 44, 44, 44, 44, 44, 44, 44, 42, 42, 42, 42, 42, 42, 42, 27, 24, 19, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:53:43,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:53:43,825 INFO L427 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:53:43,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:53:43,826 INFO L82 PathProgramCache]: Analyzing trace with hash 1196630341, now seen corresponding path program 54 times [2020-07-20 16:53:43,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:53:43,827 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [342134108] [2020-07-20 16:53:43,827 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 16:53:45,079 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:53:45,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:53:45,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 1736 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-20 16:53:45,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:53:46,590 INFO L134 CoverageAnalysis]: Checked inductivity of 40480 backedges. 2490 proven. 5142 refuted. 0 times theorem prover too weak. 32848 trivial. 0 not checked. [2020-07-20 16:53:46,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:53:49,535 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:53:49,647 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:53:51,815 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:53:52,980 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:53:53,090 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:53:53,211 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:53:53,326 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:53:56,263 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:53:56,668 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:53:56,784 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:53:56,907 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:53:57,023 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:53:57,140 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 16:53:57,247 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 16:54:01,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:05,999 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:54:06,106 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:54:06,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:06,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:09,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:09,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:11,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:11,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:13,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:13,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:13,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:14,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:14,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:14,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:17,064 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:54:17,625 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:54:17,728 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:54:17,856 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:54:17,968 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:54:18,080 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:54:23,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:23,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:26,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:28,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:29,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:29,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:29,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:29,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:30,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:30,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:54:30,789 INFO L134 CoverageAnalysis]: Checked inductivity of 40480 backedges. 2490 proven. 5219 refuted. 0 times theorem prover too weak. 32771 trivial. 0 not checked. [2020-07-20 16:54:30,789 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [342134108] [2020-07-20 16:54:30,789 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:54:30,790 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 37] total 43 [2020-07-20 16:54:30,790 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898447222] [2020-07-20 16:54:30,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-07-20 16:54:30,791 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:54:30,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-07-20 16:54:30,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1627, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 16:54:30,792 INFO L87 Difference]: Start difference. First operand 705 states and 1230 transitions. Second operand 43 states. [2020-07-20 16:54:42,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:54:42,752 INFO L93 Difference]: Finished difference Result 1882 states and 3695 transitions. [2020-07-20 16:54:42,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-07-20 16:54:42,759 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 1167 [2020-07-20 16:54:42,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:54:42,773 INFO L225 Difference]: With dead ends: 1882 [2020-07-20 16:54:42,774 INFO L226 Difference]: Without dead ends: 1183 [2020-07-20 16:54:42,778 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2377 GetRequests, 2259 SyntacticMatches, 33 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1832 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=1038, Invalid=6444, Unknown=0, NotChecked=0, Total=7482 [2020-07-20 16:54:42,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1183 states. [2020-07-20 16:54:42,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1183 to 1100. [2020-07-20 16:54:42,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1100 states. [2020-07-20 16:54:42,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1100 states to 1100 states and 2110 transitions. [2020-07-20 16:54:42,841 INFO L78 Accepts]: Start accepts. Automaton has 1100 states and 2110 transitions. Word has length 1167 [2020-07-20 16:54:42,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:54:42,842 INFO L479 AbstractCegarLoop]: Abstraction has 1100 states and 2110 transitions. [2020-07-20 16:54:42,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-07-20 16:54:42,842 INFO L276 IsEmpty]: Start isEmpty. Operand 1100 states and 2110 transitions. [2020-07-20 16:54:42,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1051 [2020-07-20 16:54:42,854 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:54:42,854 INFO L422 BasicCegarLoop]: trace histogram [86, 86, 71, 71, 51, 50, 43, 43, 43, 43, 43, 43, 43, 36, 35, 35, 35, 35, 35, 35, 35, 20, 15, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:54:43,055 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:54:43,056 INFO L427 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:54:43,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:54:43,057 INFO L82 PathProgramCache]: Analyzing trace with hash -939271171, now seen corresponding path program 55 times [2020-07-20 16:54:43,057 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:54:43,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568406304] [2020-07-20 16:54:43,058 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 16:54:44,386 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:54:44,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:54:44,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 1554 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 16:54:44,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:54:45,822 INFO L134 CoverageAnalysis]: Checked inductivity of 33052 backedges. 2362 proven. 3687 refuted. 0 times theorem prover too weak. 27003 trivial. 0 not checked. [2020-07-20 16:54:45,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:54:48,953 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 16:54:49,061 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 16:54:53,378 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:54:53,485 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:54:53,987 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:54:54,100 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:54:54,223 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 16:54:54,346 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 16:54:54,460 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:54:58,948 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:54:59,053 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:54:59,164 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:54:59,273 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:55:00,556 WARN L193 SmtUtils]: Spent 911.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:55:00,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:00,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:04,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:07,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:08,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:09,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:09,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:10,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:10,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:13,584 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 16:55:13,695 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 16:55:19,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:21,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:21,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:22,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:23,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:23,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:24,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:24,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:24,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:24,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:25,584 INFO L134 CoverageAnalysis]: Checked inductivity of 33052 backedges. 2362 proven. 3744 refuted. 0 times theorem prover too weak. 26946 trivial. 0 not checked. [2020-07-20 16:55:25,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568406304] [2020-07-20 16:55:25,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:55:25,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 33] total 37 [2020-07-20 16:55:25,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951880331] [2020-07-20 16:55:25,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-20 16:55:25,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:55:25,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-20 16:55:25,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1189, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:55:25,588 INFO L87 Difference]: Start difference. First operand 1100 states and 2110 transitions. Second operand 37 states. [2020-07-20 16:55:36,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:55:36,870 INFO L93 Difference]: Finished difference Result 2820 states and 6199 transitions. [2020-07-20 16:55:36,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 16:55:36,877 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 1050 [2020-07-20 16:55:36,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:55:36,904 INFO L225 Difference]: With dead ends: 2820 [2020-07-20 16:55:36,904 INFO L226 Difference]: Without dead ends: 1695 [2020-07-20 16:55:36,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2137 GetRequests, 2033 SyntacticMatches, 31 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1316 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=814, Invalid=4736, Unknown=0, NotChecked=0, Total=5550 [2020-07-20 16:55:36,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1695 states. [2020-07-20 16:55:37,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1695 to 1493. [2020-07-20 16:55:37,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1493 states. [2020-07-20 16:55:37,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1493 states to 1493 states and 3229 transitions. [2020-07-20 16:55:37,032 INFO L78 Accepts]: Start accepts. Automaton has 1493 states and 3229 transitions. Word has length 1050 [2020-07-20 16:55:37,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:55:37,033 INFO L479 AbstractCegarLoop]: Abstraction has 1493 states and 3229 transitions. [2020-07-20 16:55:37,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-20 16:55:37,033 INFO L276 IsEmpty]: Start isEmpty. Operand 1493 states and 3229 transitions. [2020-07-20 16:55:37,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 826 [2020-07-20 16:55:37,049 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:55:37,050 INFO L422 BasicCegarLoop]: trace histogram [63, 63, 60, 60, 40, 40, 31, 31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 30, 30, 23, 20, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:55:37,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:55:37,262 INFO L427 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:55:37,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:55:37,263 INFO L82 PathProgramCache]: Analyzing trace with hash -1158103184, now seen corresponding path program 56 times [2020-07-20 16:55:37,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:55:37,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [260128234] [2020-07-20 16:55:37,264 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 16:55:38,611 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:55:38,612 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:55:38,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 1221 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 16:55:38,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:55:39,961 INFO L134 CoverageAnalysis]: Checked inductivity of 20052 backedges. 1879 proven. 2713 refuted. 0 times theorem prover too weak. 15460 trivial. 0 not checked. [2020-07-20 16:55:39,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:55:42,239 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:55:42,450 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:55:42,559 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:55:43,550 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:55:43,675 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:55:43,810 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:55:43,957 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:55:46,191 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 16:55:46,296 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 16:55:51,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:51,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:53,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:53,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:54,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:54,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:55,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:55,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:55,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:55,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:55:58,037 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:55:58,699 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:55:58,808 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:55:58,926 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:55:59,044 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:56:00,056 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:56:00,185 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:56:00,320 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:56:00,455 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:56:00,583 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:56:00,701 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:56:00,811 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:56:06,638 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:56:07,201 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:56:07,313 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:56:07,436 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:56:07,558 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:56:07,675 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:56:07,782 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:56:08,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:11,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:11,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:13,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:14,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:15,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:15,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:15,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:16,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:16,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:16,581 INFO L134 CoverageAnalysis]: Checked inductivity of 20052 backedges. 1879 proven. 2767 refuted. 0 times theorem prover too weak. 15406 trivial. 0 not checked. [2020-07-20 16:56:16,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [260128234] [2020-07-20 16:56:16,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:16,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 33] total 37 [2020-07-20 16:56:16,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242807785] [2020-07-20 16:56:16,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-20 16:56:16,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:16,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-20 16:56:16,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1186, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 16:56:16,584 INFO L87 Difference]: Start difference. First operand 1493 states and 3229 transitions. Second operand 37 states. [2020-07-20 16:56:22,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:22,744 INFO L93 Difference]: Finished difference Result 2917 states and 6442 transitions. [2020-07-20 16:56:22,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-20 16:56:22,750 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 825 [2020-07-20 16:56:22,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:22,775 INFO L225 Difference]: With dead ends: 2917 [2020-07-20 16:56:22,776 INFO L226 Difference]: Without dead ends: 1395 [2020-07-20 16:56:22,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1680 GetRequests, 1583 SyntacticMatches, 31 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1064 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=665, Invalid=3891, Unknown=0, NotChecked=0, Total=4556 [2020-07-20 16:56:22,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1395 states. [2020-07-20 16:56:22,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1395 to 1034. [2020-07-20 16:56:22,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1034 states. [2020-07-20 16:56:22,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1034 states to 1034 states and 1807 transitions. [2020-07-20 16:56:22,897 INFO L78 Accepts]: Start accepts. Automaton has 1034 states and 1807 transitions. Word has length 825 [2020-07-20 16:56:22,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:22,898 INFO L479 AbstractCegarLoop]: Abstraction has 1034 states and 1807 transitions. [2020-07-20 16:56:22,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-20 16:56:22,898 INFO L276 IsEmpty]: Start isEmpty. Operand 1034 states and 1807 transitions. [2020-07-20 16:56:22,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 870 [2020-07-20 16:56:22,912 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:22,913 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 64, 64, 44, 44, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 21, 20, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:23,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:23,127 INFO L427 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:23,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:23,127 INFO L82 PathProgramCache]: Analyzing trace with hash -1355403901, now seen corresponding path program 57 times [2020-07-20 16:56:23,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:23,128 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [886739807] [2020-07-20 16:56:23,128 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 16:56:24,637 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:24,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:24,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 1677 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:56:24,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:25,277 INFO L134 CoverageAnalysis]: Checked inductivity of 22244 backedges. 375 proven. 2564 refuted. 0 times theorem prover too weak. 19305 trivial. 0 not checked. [2020-07-20 16:56:25,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:27,578 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:56:27,681 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:56:28,474 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:56:28,585 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:56:28,702 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:56:28,818 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:56:30,012 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:56:30,137 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:56:30,272 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 16:56:30,402 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 16:56:30,530 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 16:56:30,649 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 16:56:30,754 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:56:39,328 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:56:39,545 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:56:39,661 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:56:39,811 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:56:39,913 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:56:40,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:40,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:45,014 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:56:45,630 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:56:45,736 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:56:46,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:46,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:48,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:49,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:49,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:50,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:50,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:51,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:56:52,375 INFO L134 CoverageAnalysis]: Checked inductivity of 22244 backedges. 375 proven. 2608 refuted. 0 times theorem prover too weak. 19261 trivial. 0 not checked. [2020-07-20 16:56:52,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [886739807] [2020-07-20 16:56:52,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:56:52,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-20 16:56:52,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15527611] [2020-07-20 16:56:52,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 16:56:52,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:56:52,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 16:56:52,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-20 16:56:52,378 INFO L87 Difference]: Start difference. First operand 1034 states and 1807 transitions. Second operand 24 states. [2020-07-20 16:56:53,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:56:53,780 INFO L93 Difference]: Finished difference Result 1069 states and 1876 transitions. [2020-07-20 16:56:53,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 16:56:53,786 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 869 [2020-07-20 16:56:53,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:56:53,797 INFO L225 Difference]: With dead ends: 1069 [2020-07-20 16:56:53,797 INFO L226 Difference]: Without dead ends: 1065 [2020-07-20 16:56:53,799 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1746 GetRequests, 1697 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 16:56:53,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1065 states. [2020-07-20 16:56:53,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1065 to 1051. [2020-07-20 16:56:53,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1051 states. [2020-07-20 16:56:53,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1051 states to 1051 states and 1848 transitions. [2020-07-20 16:56:53,889 INFO L78 Accepts]: Start accepts. Automaton has 1051 states and 1848 transitions. Word has length 869 [2020-07-20 16:56:53,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:56:53,890 INFO L479 AbstractCegarLoop]: Abstraction has 1051 states and 1848 transitions. [2020-07-20 16:56:53,890 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 16:56:53,890 INFO L276 IsEmpty]: Start isEmpty. Operand 1051 states and 1848 transitions. [2020-07-20 16:56:53,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 810 [2020-07-20 16:56:53,905 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:56:53,906 INFO L422 BasicCegarLoop]: trace histogram [62, 62, 57, 57, 44, 44, 31, 31, 31, 31, 31, 31, 31, 28, 28, 28, 28, 28, 28, 28, 18, 16, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:56:54,119 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:56:54,120 INFO L427 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:56:54,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:56:54,120 INFO L82 PathProgramCache]: Analyzing trace with hash -1256949030, now seen corresponding path program 58 times [2020-07-20 16:56:54,121 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:56:54,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2000113877] [2020-07-20 16:56:54,121 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 16:56:55,684 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:56:55,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:56:55,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 1563 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:56:55,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:56:56,247 INFO L134 CoverageAnalysis]: Checked inductivity of 19212 backedges. 406 proven. 2029 refuted. 0 times theorem prover too weak. 16777 trivial. 0 not checked. [2020-07-20 16:56:56,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:56:59,227 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 16:57:00,325 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:57:00,430 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:57:00,541 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:57:00,657 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:57:00,762 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:57:08,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:08,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:13,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:13,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:16,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:16,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:17,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:17,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:18,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:18,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:18,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:19,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:19,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:19,265 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:19,654 INFO L134 CoverageAnalysis]: Checked inductivity of 19212 backedges. 406 proven. 2062 refuted. 0 times theorem prover too weak. 16744 trivial. 0 not checked. [2020-07-20 16:57:19,654 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2000113877] [2020-07-20 16:57:19,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:19,655 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 16:57:19,655 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029479338] [2020-07-20 16:57:19,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 16:57:19,656 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:19,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 16:57:19,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 16:57:19,656 INFO L87 Difference]: Start difference. First operand 1051 states and 1848 transitions. Second operand 22 states. [2020-07-20 16:57:20,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:20,475 INFO L93 Difference]: Finished difference Result 1152 states and 1994 transitions. [2020-07-20 16:57:20,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:57:20,479 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 809 [2020-07-20 16:57:20,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:20,486 INFO L225 Difference]: With dead ends: 1152 [2020-07-20 16:57:20,487 INFO L226 Difference]: Without dead ends: 1148 [2020-07-20 16:57:20,487 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1625 GetRequests, 1581 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 16:57:20,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1148 states. [2020-07-20 16:57:20,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1148 to 1049. [2020-07-20 16:57:20,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1049 states. [2020-07-20 16:57:20,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1049 states to 1049 states and 1844 transitions. [2020-07-20 16:57:20,535 INFO L78 Accepts]: Start accepts. Automaton has 1049 states and 1844 transitions. Word has length 809 [2020-07-20 16:57:20,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:20,536 INFO L479 AbstractCegarLoop]: Abstraction has 1049 states and 1844 transitions. [2020-07-20 16:57:20,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 16:57:20,536 INFO L276 IsEmpty]: Start isEmpty. Operand 1049 states and 1844 transitions. [2020-07-20 16:57:20,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1892 [2020-07-20 16:57:20,563 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:20,564 INFO L422 BasicCegarLoop]: trace histogram [156, 156, 125, 125, 99, 99, 78, 78, 78, 78, 78, 78, 78, 62, 62, 62, 62, 62, 62, 62, 57, 37, 26, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:20,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:20,765 INFO L427 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:20,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:20,766 INFO L82 PathProgramCache]: Analyzing trace with hash 1761750115, now seen corresponding path program 59 times [2020-07-20 16:57:20,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:20,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1836484364] [2020-07-20 16:57:20,767 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 16:57:22,478 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:57:22,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:22,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 2800 conjuncts, 40 conjunts are in the unsatisfiable core [2020-07-20 16:57:22,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:25,012 INFO L134 CoverageAnalysis]: Checked inductivity of 108638 backedges. 4705 proven. 9572 refuted. 0 times theorem prover too weak. 94361 trivial. 0 not checked. [2020-07-20 16:57:25,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:27,397 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:57:27,503 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:57:28,215 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:57:28,328 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:57:28,448 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:57:28,667 WARN L193 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:57:29,765 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:57:29,891 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:57:30,025 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:57:30,159 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:57:33,244 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:57:33,350 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:57:33,458 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:57:33,563 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:57:34,510 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:57:34,635 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:57:34,770 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:57:34,897 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:57:35,531 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:57:35,664 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:57:35,806 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:57:35,944 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:57:38,902 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:57:39,006 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:57:39,114 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:57:39,228 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:57:40,182 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:57:40,306 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:57:40,437 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:57:40,565 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:57:41,236 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:57:41,376 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:57:41,519 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:57:41,665 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:57:41,804 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 16:57:41,931 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:57:42,055 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 16:57:42,175 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:57:42,291 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:57:42,401 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:57:42,505 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:57:47,689 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:57:47,797 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:57:48,483 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:57:48,595 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:57:48,721 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:57:48,848 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:57:49,844 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:57:49,966 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:57:50,097 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:57:50,229 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:57:50,354 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:57:50,481 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:57:50,601 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:57:50,713 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:57:50,817 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:57:51,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:51,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:58,011 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:57:58,218 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:57:59,012 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:57:59,126 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:57:59,247 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:57:59,363 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:57:59,480 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:57:59,586 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:58:00,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:00,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:05,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:08,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:08,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:11,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:12,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:12,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:12,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:12,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:13,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:13,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:13,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:15,388 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:58:15,491 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:58:16,333 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:58:16,440 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:58:17,429 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:58:17,569 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:58:17,708 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:58:17,844 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:58:17,981 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:58:18,111 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:58:18,221 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:58:18,325 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:58:23,991 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 16:58:26,349 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:58:26,455 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:58:26,571 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:58:26,686 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:58:27,447 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:58:27,568 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:58:27,700 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:58:27,829 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:58:27,955 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:58:28,068 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:58:28,176 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:58:28,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:33,962 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:58:34,069 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:58:34,175 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:58:34,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:38,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:40,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:40,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:42,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:43,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:43,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:43,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:43,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:44,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:58:45,978 INFO L134 CoverageAnalysis]: Checked inductivity of 108638 backedges. 4705 proven. 9672 refuted. 0 times theorem prover too weak. 94261 trivial. 0 not checked. [2020-07-20 16:58:45,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1836484364] [2020-07-20 16:58:45,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:58:45,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 41] total 47 [2020-07-20 16:58:45,980 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538976081] [2020-07-20 16:58:45,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-20 16:58:45,981 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:58:45,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-20 16:58:45,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1954, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 16:58:45,982 INFO L87 Difference]: Start difference. First operand 1049 states and 1844 transitions. Second operand 47 states. [2020-07-20 16:59:01,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:59:01,719 INFO L93 Difference]: Finished difference Result 2421 states and 5010 transitions. [2020-07-20 16:59:01,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-20 16:59:01,724 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 1891 [2020-07-20 16:59:01,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:59:01,738 INFO L225 Difference]: With dead ends: 2421 [2020-07-20 16:59:01,739 INFO L226 Difference]: Without dead ends: 1366 [2020-07-20 16:59:01,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3831 GetRequests, 3699 SyntacticMatches, 37 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2366 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=1252, Invalid=8060, Unknown=0, NotChecked=0, Total=9312 [2020-07-20 16:59:01,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1366 states. [2020-07-20 16:59:01,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1366 to 1272. [2020-07-20 16:59:01,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1272 states. [2020-07-20 16:59:01,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1272 states to 1272 states and 2678 transitions. [2020-07-20 16:59:01,839 INFO L78 Accepts]: Start accepts. Automaton has 1272 states and 2678 transitions. Word has length 1891 [2020-07-20 16:59:01,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:59:01,840 INFO L479 AbstractCegarLoop]: Abstraction has 1272 states and 2678 transitions. [2020-07-20 16:59:01,840 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-20 16:59:01,841 INFO L276 IsEmpty]: Start isEmpty. Operand 1272 states and 2678 transitions. [2020-07-20 16:59:01,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1083 [2020-07-20 16:59:01,855 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:59:01,856 INFO L422 BasicCegarLoop]: trace histogram [92, 92, 69, 69, 55, 54, 46, 46, 46, 46, 46, 46, 46, 37, 34, 34, 34, 34, 34, 34, 34, 21, 15, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:59:02,056 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:59:02,057 INFO L427 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:59:02,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:59:02,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1863647951, now seen corresponding path program 60 times [2020-07-20 16:59:02,058 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:59:02,058 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568640490] [2020-07-20 16:59:02,059 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 16:59:03,683 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:59:03,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:59:03,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 1601 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 16:59:03,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:59:04,856 INFO L134 CoverageAnalysis]: Checked inductivity of 35428 backedges. 16919 proven. 2298 refuted. 0 times theorem prover too weak. 16211 trivial. 0 not checked. [2020-07-20 16:59:04,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:59:16,261 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:59:21,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts