/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 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:00:28,065 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:00:28,071 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:00:28,090 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:00:28,090 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:00:28,092 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:00:28,094 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:00:28,107 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:00:28,110 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:00:28,110 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:00:28,113 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:00:28,114 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:00:28,115 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:00:28,115 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:00:28,116 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:00:28,119 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:00:28,120 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:00:28,122 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:00:28,125 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:00:28,129 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:00:28,133 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:00:28,137 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:00:28,138 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:00:28,138 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:00:28,142 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:00:28,151 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:00:28,152 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:00:28,154 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:00:28,154 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:00:28,178 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:00:28,178 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:00:28,180 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:00:28,180 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:00:28,181 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:00:28,181 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:00:28,181 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:00:28,181 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:00:28,181 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:00:28,182 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:00:28,183 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:00:28,183 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:00:28,183 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:00:28,183 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:00:28,184 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:00:28,184 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:00:28,184 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:00:28,184 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:00:28,185 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:00:28,185 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:00:28,185 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:00:28,185 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:00:28,185 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:00:28,185 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:00:28,186 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:00:28,186 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:00:28,186 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:28,186 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:00:28,186 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:00:28,187 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 -> 2 [2020-07-21 16:00:28,493 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:00:28,506 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:00:28,510 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:00:28,511 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:00:28,512 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:00:28,512 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-1.c [2020-07-21 16:00:28,591 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/883b954cf/35cd46d28a804b10bd092860b56d9289/FLAG4567c6127 [2020-07-21 16:00:29,065 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:00:29,066 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_5-1.c [2020-07-21 16:00:29,075 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/883b954cf/35cd46d28a804b10bd092860b56d9289/FLAG4567c6127 [2020-07-21 16:00:29,433 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/883b954cf/35cd46d28a804b10bd092860b56d9289 [2020-07-21 16:00:29,444 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:00:29,447 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:00:29,448 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:00:29,448 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:00:29,452 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:00:29,453 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:00:29" (1/1) ... [2020-07-21 16:00:29,456 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f8401eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:29, skipping insertion in model container [2020-07-21 16:00:29,456 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:00:29" (1/1) ... [2020-07-21 16:00:29,464 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:00:29,481 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:00:29,646 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:00:29,650 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:00:29,668 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:00:29,682 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:00:29,683 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:29 WrapperNode [2020-07-21 16:00:29,683 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:00:29,684 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:00:29,684 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:00:29,684 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:00:29,695 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:29" (1/1) ... [2020-07-21 16:00:29,695 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:29" (1/1) ... [2020-07-21 16:00:29,793 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:29" (1/1) ... [2020-07-21 16:00:29,794 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:29" (1/1) ... [2020-07-21 16:00:29,799 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:29" (1/1) ... [2020-07-21 16:00:29,800 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:29" (1/1) ... [2020-07-21 16:00:29,801 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:29" (1/1) ... [2020-07-21 16:00:29,803 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:00:29,803 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:00:29,803 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:00:29,803 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:00:29,804 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:29" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:00:29,874 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:00:29,874 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:00:29,874 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 16:00:29,874 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 16:00:29,875 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:00:29,875 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:00:29,875 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:00:29,875 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 16:00:29,875 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 16:00:29,875 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:00:29,876 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:00:29,876 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:00:30,064 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:00:30,064 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 16:00:30,069 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:00:30 BoogieIcfgContainer [2020-07-21 16:00:30,069 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:00:30,071 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:00:30,071 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:00:30,076 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:00:30,077 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:00:29" (1/3) ... [2020-07-21 16:00:30,078 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@633aae15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:00:30, skipping insertion in model container [2020-07-21 16:00:30,078 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:29" (2/3) ... [2020-07-21 16:00:30,078 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@633aae15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:00:30, skipping insertion in model container [2020-07-21 16:00:30,079 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:00:30" (3/3) ... [2020-07-21 16:00:30,080 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-1.c [2020-07-21 16:00:30,111 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:00:30,132 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:00:30,169 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:00:30,213 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:00:30,214 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:00:30,214 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:00:30,214 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:00:30,214 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:00:30,214 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:00:30,214 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:00:30,214 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:00:30,230 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 16:00:30,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 16:00:30,237 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:30,238 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:30,238 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:30,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:30,243 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 16:00:30,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:30,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [952137746] [2020-07-21 16:00:30,251 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:30,314 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:30,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:30,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:00:30,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:30,408 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:00:30,408 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:00:30,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [952137746] [2020-07-21 16:00:30,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:00:30,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:00:30,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859908186] [2020-07-21 16:00:30,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:00:30,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:30,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:00:30,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:00:30,434 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 16:00:30,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:30,551 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 16:00:30,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:00:30,553 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 16:00:30,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:30,564 INFO L225 Difference]: With dead ends: 44 [2020-07-21 16:00:30,564 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 16:00:30,567 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 [2020-07-21 16:00:30,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 16:00:30,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 16:00:30,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:00:30,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 16:00:30,610 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 16:00:30,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:30,610 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 16:00:30,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:00:30,610 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 16:00:30,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 16:00:30,612 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:30,613 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:30,814 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:30,815 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:30,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:30,816 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 16:00:30,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:30,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [456039698] [2020-07-21 16:00:30,818 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:30,843 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:30,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:30,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:00:30,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:30,879 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:00:30,879 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:00:30,880 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [456039698] [2020-07-21 16:00:30,880 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:00:30,881 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:00:30,881 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349682807] [2020-07-21 16:00:30,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:00:30,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:30,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:00:30,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:00:30,885 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 16:00:30,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:30,966 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 16:00:30,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:00:30,967 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 16:00:30,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:30,968 INFO L225 Difference]: With dead ends: 36 [2020-07-21 16:00:30,969 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 16:00:30,970 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 [2020-07-21 16:00:30,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 16:00:30,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 16:00:30,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:00:30,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 16:00:30,981 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 16:00:30,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:30,981 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 16:00:30,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:00:30,982 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 16:00:30,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 16:00:30,983 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:30,984 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] [2020-07-21 16:00:31,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:31,198 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:31,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:31,199 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 16:00:31,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:31,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [693545298] [2020-07-21 16:00:31,201 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:31,237 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:31,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:31,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:31,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:31,317 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:00:31,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:31,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:31,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:31,569 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:00:31,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [693545298] [2020-07-21 16:00:31,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:31,570 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:31,571 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418275036] [2020-07-21 16:00:31,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:31,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:31,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:31,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:31,572 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 16:00:31,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:31,677 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 16:00:31,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:31,679 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 16:00:31,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:31,681 INFO L225 Difference]: With dead ends: 41 [2020-07-21 16:00:31,681 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 16:00:31,681 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 [2020-07-21 16:00:31,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 16:00:31,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 16:00:31,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 16:00:31,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 16:00:31,692 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 16:00:31,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:31,693 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 16:00:31,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:31,693 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 16:00:31,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:00:31,695 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:31,695 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] [2020-07-21 16:00:31,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:31,910 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:31,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:31,911 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 16:00:31,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:31,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [127839365] [2020-07-21 16:00:31,913 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:31,946 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:31,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:31,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:31,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:31,994 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:00:31,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:32,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,152 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:00:32,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [127839365] [2020-07-21 16:00:32,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:32,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:32,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685851127] [2020-07-21 16:00:32,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:32,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:32,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:32,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:32,155 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 16:00:32,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:32,274 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 16:00:32,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:32,275 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 16:00:32,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:32,277 INFO L225 Difference]: With dead ends: 46 [2020-07-21 16:00:32,277 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 16:00:32,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:32,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 16:00:32,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 16:00:32,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 16:00:32,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 16:00:32,288 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 16:00:32,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:32,288 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 16:00:32,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:32,288 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 16:00:32,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 16:00:32,290 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:32,291 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] [2020-07-21 16:00:32,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:32,505 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:32,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:32,506 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 16:00:32,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:32,506 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1044470988] [2020-07-21 16:00:32,506 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:32,544 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:32,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:32,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:32,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:32,613 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:32,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:32,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:32,996 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 16:00:32,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1044470988] [2020-07-21 16:00:32,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:32,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:00:32,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438369542] [2020-07-21 16:00:32,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:32,999 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:32,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:32,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:32,999 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 16:00:33,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:33,161 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 16:00:33,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:33,161 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 16:00:33,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:33,163 INFO L225 Difference]: With dead ends: 51 [2020-07-21 16:00:33,163 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 16:00:33,165 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 [2020-07-21 16:00:33,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 16:00:33,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 16:00:33,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 16:00:33,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 16:00:33,177 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 16:00:33,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:33,178 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 16:00:33,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:33,178 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 16:00:33,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 16:00:33,180 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:33,180 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] [2020-07-21 16:00:33,394 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:33,395 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:33,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:33,395 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 16:00:33,396 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:33,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [302199168] [2020-07-21 16:00:33,397 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:33,427 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:33,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:33,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:33,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:33,494 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:33,494 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:33,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:33,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:33,807 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:33,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [302199168] [2020-07-21 16:00:33,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:33,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 16:00:33,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955503046] [2020-07-21 16:00:33,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:33,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:33,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:33,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:33,810 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 16:00:34,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:34,063 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-21 16:00:34,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:34,067 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 16:00:34,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:34,069 INFO L225 Difference]: With dead ends: 84 [2020-07-21 16:00:34,069 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 16:00:34,076 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 [2020-07-21 16:00:34,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 16:00:34,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-21 16:00:34,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-21 16:00:34,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-21 16:00:34,099 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-21 16:00:34,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:34,103 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-21 16:00:34,103 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:34,103 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-21 16:00:34,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 16:00:34,110 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:34,110 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] [2020-07-21 16:00:34,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:34,311 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:34,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:34,312 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-21 16:00:34,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:34,313 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911422100] [2020-07-21 16:00:34,314 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:34,347 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:34,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:34,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:34,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:34,399 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 16:00:34,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:34,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:34,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:34,722 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 16:00:34,723 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911422100] [2020-07-21 16:00:34,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:34,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:00:34,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813988515] [2020-07-21 16:00:34,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:34,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:34,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:34,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:34,725 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-21 16:00:34,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:34,876 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-21 16:00:34,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:34,877 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-21 16:00:34,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:34,879 INFO L225 Difference]: With dead ends: 63 [2020-07-21 16:00:34,880 INFO L226 Difference]: Without dead ends: 59 [2020-07-21 16:00:34,880 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 [2020-07-21 16:00:34,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-21 16:00:34,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-21 16:00:34,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 16:00:34,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-21 16:00:34,893 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-21 16:00:34,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:34,893 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-21 16:00:34,893 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:34,893 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-21 16:00:34,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 16:00:34,896 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:34,896 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] [2020-07-21 16:00:35,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:35,108 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:35,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:35,108 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-21 16:00:35,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:35,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2133854021] [2020-07-21 16:00:35,110 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:35,155 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:35,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:35,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:35,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:35,219 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:00:35,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:35,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,435 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:00:35,435 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2133854021] [2020-07-21 16:00:35,435 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:35,436 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:35,436 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818940366] [2020-07-21 16:00:35,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:35,442 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:35,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:35,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:35,442 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-21 16:00:35,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:35,542 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-21 16:00:35,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:35,543 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-21 16:00:35,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:35,546 INFO L225 Difference]: With dead ends: 65 [2020-07-21 16:00:35,546 INFO L226 Difference]: Without dead ends: 61 [2020-07-21 16:00:35,547 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 [2020-07-21 16:00:35,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-21 16:00:35,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-21 16:00:35,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 16:00:35,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-21 16:00:35,559 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-21 16:00:35,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:35,559 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-21 16:00:35,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:35,559 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-21 16:00:35,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 16:00:35,562 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:35,562 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] [2020-07-21 16:00:35,772 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:35,772 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:35,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:35,773 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-21 16:00:35,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:35,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [830551724] [2020-07-21 16:00:35,775 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:35,823 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:35,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:35,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:35,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:35,906 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 16:00:35,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:36,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,494 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-21 16:00:36,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [830551724] [2020-07-21 16:00:36,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:36,495 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:00:36,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610846464] [2020-07-21 16:00:36,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:00:36,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:36,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:00:36,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:36,496 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-21 16:00:36,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:36,681 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-21 16:00:36,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:36,682 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-21 16:00:36,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:36,684 INFO L225 Difference]: With dead ends: 75 [2020-07-21 16:00:36,684 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 16:00:36,685 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 [2020-07-21 16:00:36,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 16:00:36,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-21 16:00:36,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 16:00:36,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-21 16:00:36,699 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-21 16:00:36,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:36,700 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-21 16:00:36,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:00:36,700 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-21 16:00:36,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 16:00:36,701 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:36,702 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] [2020-07-21 16:00:36,917 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:36,918 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:36,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:36,918 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-21 16:00:36,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:36,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2125982107] [2020-07-21 16:00:36,920 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:36,968 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:36,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:36,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:36,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:37,035 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 16:00:37,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:37,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:37,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:37,408 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 16:00:37,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2125982107] [2020-07-21 16:00:37,409 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:37,409 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 16:00:37,409 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149915449] [2020-07-21 16:00:37,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:37,410 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:37,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:37,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:37,411 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-21 16:00:37,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:37,618 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-21 16:00:37,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:37,619 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-21 16:00:37,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:37,621 INFO L225 Difference]: With dead ends: 114 [2020-07-21 16:00:37,621 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 16:00:37,623 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 [2020-07-21 16:00:37,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 16:00:37,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-21 16:00:37,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 16:00:37,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-21 16:00:37,634 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-21 16:00:37,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:37,635 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-21 16:00:37,635 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:37,635 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-21 16:00:37,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 16:00:37,637 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:37,637 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] [2020-07-21 16:00:37,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:37,851 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:37,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:37,852 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-21 16:00:37,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:37,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646144954] [2020-07-21 16:00:37,853 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:37,894 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:37,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:37,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:37,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:37,976 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 16:00:37,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:38,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:38,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:38,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:38,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:38,609 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 16:00:38,609 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646144954] [2020-07-21 16:00:38,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:38,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:00:38,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907817341] [2020-07-21 16:00:38,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:00:38,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:38,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:00:38,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:38,611 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-21 16:00:39,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:39,012 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-21 16:00:39,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:00:39,012 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-21 16:00:39,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:39,014 INFO L225 Difference]: With dead ends: 131 [2020-07-21 16:00:39,014 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 16:00:39,016 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 [2020-07-21 16:00:39,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 16:00:39,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-21 16:00:39,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-21 16:00:39,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-21 16:00:39,037 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-21 16:00:39,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:39,043 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-21 16:00:39,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:00:39,043 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-21 16:00:39,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-21 16:00:39,045 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:39,045 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] [2020-07-21 16:00:39,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:39,261 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:39,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:39,261 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-21 16:00:39,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:39,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [83010737] [2020-07-21 16:00:39,262 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:39,314 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:39,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:39,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:39,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:39,434 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 16:00:39,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:39,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,259 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-21 16:00:40,259 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [83010737] [2020-07-21 16:00:40,259 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:40,259 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 16:00:40,259 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366848666] [2020-07-21 16:00:40,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:40,260 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:40,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:40,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:40,261 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-21 16:00:41,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:41,131 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-21 16:00:41,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 16:00:41,132 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-21 16:00:41,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:41,137 INFO L225 Difference]: With dead ends: 186 [2020-07-21 16:00:41,137 INFO L226 Difference]: Without dead ends: 124 [2020-07-21 16:00:41,140 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 [2020-07-21 16:00:41,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-21 16:00:41,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-21 16:00:41,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 16:00:41,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-21 16:00:41,181 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-21 16:00:41,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:41,181 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-21 16:00:41,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:41,182 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-21 16:00:41,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 16:00:41,185 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:41,186 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] [2020-07-21 16:00:41,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:41,401 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:41,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:41,402 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-21 16:00:41,403 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:41,403 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1115257657] [2020-07-21 16:00:41,403 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:41,463 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:41,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:41,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:41,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:41,525 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-21 16:00:41,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:41,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:41,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:41,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:41,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:42,025 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 16:00:42,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1115257657] [2020-07-21 16:00:42,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:42,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 16:00:42,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381100411] [2020-07-21 16:00:42,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 16:00:42,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:42,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 16:00:42,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:00:42,027 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 13 states. [2020-07-21 16:00:42,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:42,202 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-21 16:00:42,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:42,204 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 68 [2020-07-21 16:00:42,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:42,206 INFO L225 Difference]: With dead ends: 114 [2020-07-21 16:00:42,206 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 16:00:42,207 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:42,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 16:00:42,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-21 16:00:42,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-21 16:00:42,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-21 16:00:42,219 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-21 16:00:42,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:42,219 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-21 16:00:42,219 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 16:00:42,219 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-21 16:00:42,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-21 16:00:42,221 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:42,221 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] [2020-07-21 16:00:42,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:42,433 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:42,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:42,434 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-21 16:00:42,434 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:42,435 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [896276239] [2020-07-21 16:00:42,435 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:42,493 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:42,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:42,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:42,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:42,587 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-07-21 16:00:42,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:42,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,293 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2020-07-21 16:00:43,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [896276239] [2020-07-21 16:00:43,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:43,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-21 16:00:43,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452419065] [2020-07-21 16:00:43,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:00:43,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:43,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:00:43,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:00:43,295 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-21 16:00:43,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:43,781 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-21 16:00:43,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 16:00:43,787 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-21 16:00:43,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:43,790 INFO L225 Difference]: With dead ends: 269 [2020-07-21 16:00:43,790 INFO L226 Difference]: Without dead ends: 168 [2020-07-21 16:00:43,792 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 [2020-07-21 16:00:43,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-21 16:00:43,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-21 16:00:43,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 16:00:43,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-21 16:00:43,808 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-21 16:00:43,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:43,809 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-21 16:00:43,809 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:00:43,809 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-21 16:00:43,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-21 16:00:43,811 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:43,811 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] [2020-07-21 16:00:44,026 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:44,026 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:44,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:44,027 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-21 16:00:44,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:44,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [156662082] [2020-07-21 16:00:44,027 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:44,091 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:44,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:44,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:44,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:44,128 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-21 16:00:44,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:44,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:44,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:44,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:44,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:44,478 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-21 16:00:44,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [156662082] [2020-07-21 16:00:44,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:44,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 16:00:44,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157652997] [2020-07-21 16:00:44,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 16:00:44,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:44,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 16:00:44,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:00:44,481 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 11 states. [2020-07-21 16:00:44,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:44,626 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-21 16:00:44,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:44,626 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 80 [2020-07-21 16:00:44,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:44,640 INFO L225 Difference]: With dead ends: 167 [2020-07-21 16:00:44,640 INFO L226 Difference]: Without dead ends: 163 [2020-07-21 16:00:44,641 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 144 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:44,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-21 16:00:44,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-21 16:00:44,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-21 16:00:44,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-21 16:00:44,658 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-21 16:00:44,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:44,659 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-21 16:00:44,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 16:00:44,659 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-21 16:00:44,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 16:00:44,663 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:44,663 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] [2020-07-21 16:00:44,876 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:44,877 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:44,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:44,877 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-21 16:00:44,877 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:44,878 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [20313734] [2020-07-21 16:00:44,878 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:44,942 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:44,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:44,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:44,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:45,042 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2020-07-21 16:00:45,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:45,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,205 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-21 16:00:46,206 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [20313734] [2020-07-21 16:00:46,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:46,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 16:00:46,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116124252] [2020-07-21 16:00:46,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:46,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:46,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:46,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:46,208 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-21 16:00:46,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:46,764 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-21 16:00:46,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 16:00:46,765 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-21 16:00:46,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:46,769 INFO L225 Difference]: With dead ends: 369 [2020-07-21 16:00:46,769 INFO L226 Difference]: Without dead ends: 218 [2020-07-21 16:00:46,773 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 [2020-07-21 16:00:46,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-21 16:00:46,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-21 16:00:46,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-21 16:00:46,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-21 16:00:46,795 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-21 16:00:46,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:46,795 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-21 16:00:46,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:46,796 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-21 16:00:46,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-21 16:00:46,799 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:46,799 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] [2020-07-21 16:00:47,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:47,013 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:47,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:47,013 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-21 16:00:47,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:47,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [907259682] [2020-07-21 16:00:47,014 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:47,093 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:47,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:47,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:47,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:47,154 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-21 16:00:47,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:47,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,522 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-21 16:00:47,523 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [907259682] [2020-07-21 16:00:47,523 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:47,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 16:00:47,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729251176] [2020-07-21 16:00:47,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 16:00:47,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:47,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 16:00:47,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:00:47,525 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 11 states. [2020-07-21 16:00:47,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:47,654 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-21 16:00:47,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:47,655 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 92 [2020-07-21 16:00:47,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:47,658 INFO L225 Difference]: With dead ends: 191 [2020-07-21 16:00:47,658 INFO L226 Difference]: Without dead ends: 187 [2020-07-21 16:00:47,659 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 169 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:47,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-21 16:00:47,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-21 16:00:47,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 16:00:47,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-21 16:00:47,675 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-21 16:00:47,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:47,676 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-21 16:00:47,676 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 16:00:47,676 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-21 16:00:47,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-07-21 16:00:47,679 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:47,679 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] [2020-07-21 16:00:47,893 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:47,893 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:47,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:47,894 INFO L82 PathProgramCache]: Analyzing trace with hash -464279411, now seen corresponding path program 2 times [2020-07-21 16:00:47,894 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:47,895 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1093838548] [2020-07-21 16:00:47,895 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:47,971 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:47,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:47,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:00:47,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:48,079 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 70 proven. 124 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2020-07-21 16:00:48,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:48,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:48,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:48,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,261 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 70 proven. 130 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2020-07-21 16:00:49,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1093838548] [2020-07-21 16:00:49,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:49,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:00:49,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969394398] [2020-07-21 16:00:49,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:49,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:49,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:49,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:49,264 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 21 states. [2020-07-21 16:00:49,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:49,921 INFO L93 Difference]: Finished difference Result 399 states and 796 transitions. [2020-07-21 16:00:49,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 16:00:49,922 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 118 [2020-07-21 16:00:49,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:49,926 INFO L225 Difference]: With dead ends: 399 [2020-07-21 16:00:49,926 INFO L226 Difference]: Without dead ends: 226 [2020-07-21 16:00:49,929 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 206 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=219, Invalid=971, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:00:49,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-21 16:00:49,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 192. [2020-07-21 16:00:49,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-21 16:00:49,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 334 transitions. [2020-07-21 16:00:49,945 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 334 transitions. Word has length 118 [2020-07-21 16:00:49,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:49,946 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 334 transitions. [2020-07-21 16:00:49,946 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:49,946 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 334 transitions. [2020-07-21 16:00:49,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 16:00:49,949 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:49,949 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] [2020-07-21 16:00:50,162 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:50,163 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:50,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:50,164 INFO L82 PathProgramCache]: Analyzing trace with hash -1258440967, now seen corresponding path program 3 times [2020-07-21 16:00:50,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:50,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2072627997] [2020-07-21 16:00:50,165 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:50,253 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:50,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:50,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:50,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:50,331 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-21 16:00:50,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:50,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:50,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,240 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 125 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-21 16:00:51,240 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2072627997] [2020-07-21 16:00:51,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:51,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 16:00:51,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027906787] [2020-07-21 16:00:51,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 16:00:51,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:51,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 16:00:51,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:00:51,242 INFO L87 Difference]: Start difference. First operand 192 states and 334 transitions. Second operand 15 states. [2020-07-21 16:00:51,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:51,427 INFO L93 Difference]: Finished difference Result 205 states and 355 transitions. [2020-07-21 16:00:51,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:51,428 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 16:00:51,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:51,431 INFO L225 Difference]: With dead ends: 205 [2020-07-21 16:00:51,431 INFO L226 Difference]: Without dead ends: 201 [2020-07-21 16:00:51,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 211 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:00:51,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-07-21 16:00:51,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 192. [2020-07-21 16:00:51,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-21 16:00:51,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 334 transitions. [2020-07-21 16:00:51,447 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 334 transitions. Word has length 117 [2020-07-21 16:00:51,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:51,448 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 334 transitions. [2020-07-21 16:00:51,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 16:00:51,448 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 334 transitions. [2020-07-21 16:00:51,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 16:00:51,451 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:51,451 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] [2020-07-21 16:00:51,664 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:51,665 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:51,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:51,665 INFO L82 PathProgramCache]: Analyzing trace with hash -650257977, now seen corresponding path program 5 times [2020-07-21 16:00:51,665 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:51,665 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [431019678] [2020-07-21 16:00:51,666 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:51,763 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:51,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:51,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:51,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:51,884 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 210 proven. 31 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-21 16:00:51,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:52,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,806 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 51 proven. 126 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2020-07-21 16:00:52,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [431019678] [2020-07-21 16:00:52,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:52,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:00:52,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791761760] [2020-07-21 16:00:52,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:00:52,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:52,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:00:52,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:52,810 INFO L87 Difference]: Start difference. First operand 192 states and 334 transitions. Second operand 17 states. [2020-07-21 16:00:53,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:53,150 INFO L93 Difference]: Finished difference Result 364 states and 644 transitions. [2020-07-21 16:00:53,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:00:53,150 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 120 [2020-07-21 16:00:53,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:53,152 INFO L225 Difference]: With dead ends: 364 [2020-07-21 16:00:53,152 INFO L226 Difference]: Without dead ends: 178 [2020-07-21 16:00:53,154 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 [2020-07-21 16:00:53,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-21 16:00:53,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 176. [2020-07-21 16:00:53,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 16:00:53,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 287 transitions. [2020-07-21 16:00:53,167 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 287 transitions. Word has length 120 [2020-07-21 16:00:53,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:53,168 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 287 transitions. [2020-07-21 16:00:53,168 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:00:53,168 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 287 transitions. [2020-07-21 16:00:53,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 16:00:53,171 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:53,171 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:53,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:53,384 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:53,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:53,385 INFO L82 PathProgramCache]: Analyzing trace with hash 989968015, now seen corresponding path program 6 times [2020-07-21 16:00:53,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:53,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [701360380] [2020-07-21 16:00:53,386 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:53,505 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:53,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:53,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 16:00:53,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:53,648 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 82 proven. 124 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2020-07-21 16:00:53,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:54,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,975 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 81 proven. 131 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2020-07-21 16:00:54,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [701360380] [2020-07-21 16:00:54,975 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:54,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18] total 23 [2020-07-21 16:00:54,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689982949] [2020-07-21 16:00:54,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:00:54,977 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:54,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:00:54,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:00:54,977 INFO L87 Difference]: Start difference. First operand 176 states and 287 transitions. Second operand 23 states. [2020-07-21 16:00:55,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:55,859 INFO L93 Difference]: Finished difference Result 419 states and 765 transitions. [2020-07-21 16:00:55,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 16:00:55,860 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 121 [2020-07-21 16:00:55,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:55,863 INFO L225 Difference]: With dead ends: 419 [2020-07-21 16:00:55,863 INFO L226 Difference]: Without dead ends: 214 [2020-07-21 16:00:55,866 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 209 SyntacticMatches, 15 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=291, Invalid=1269, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:00:55,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2020-07-21 16:00:55,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 203. [2020-07-21 16:00:55,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 203 states. [2020-07-21 16:00:55,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 331 transitions. [2020-07-21 16:00:55,882 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 331 transitions. Word has length 121 [2020-07-21 16:00:55,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:55,882 INFO L479 AbstractCegarLoop]: Abstraction has 203 states and 331 transitions. [2020-07-21 16:00:55,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:00:55,882 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 331 transitions. [2020-07-21 16:00:55,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-21 16:00:55,885 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:55,885 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] [2020-07-21 16:00:56,098 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:56,099 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:56,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:56,100 INFO L82 PathProgramCache]: Analyzing trace with hash 594466134, now seen corresponding path program 7 times [2020-07-21 16:00:56,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:56,100 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1344149345] [2020-07-21 16:00:56,100 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:56,226 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:56,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:56,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:00:56,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:56,352 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 73 proven. 91 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2020-07-21 16:00:56,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:56,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,547 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 73 proven. 97 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2020-07-21 16:00:57,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1344149345] [2020-07-21 16:00:57,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:57,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:00:57,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870520842] [2020-07-21 16:00:57,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:57,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:57,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:57,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:57,549 INFO L87 Difference]: Start difference. First operand 203 states and 331 transitions. Second operand 21 states. [2020-07-21 16:00:58,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:58,134 INFO L93 Difference]: Finished difference Result 389 states and 704 transitions. [2020-07-21 16:00:58,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 16:00:58,141 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 107 [2020-07-21 16:00:58,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:58,143 INFO L225 Difference]: With dead ends: 389 [2020-07-21 16:00:58,143 INFO L226 Difference]: Without dead ends: 189 [2020-07-21 16:00:58,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 185 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=186, Invalid=870, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:00:58,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2020-07-21 16:00:58,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 167. [2020-07-21 16:00:58,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2020-07-21 16:00:58,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 257 transitions. [2020-07-21 16:00:58,161 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 257 transitions. Word has length 107 [2020-07-21 16:00:58,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:58,161 INFO L479 AbstractCegarLoop]: Abstraction has 167 states and 257 transitions. [2020-07-21 16:00:58,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:58,162 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 257 transitions. [2020-07-21 16:00:58,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 16:00:58,164 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:58,164 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 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] [2020-07-21 16:00:58,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:58,380 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:58,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:58,381 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 8 times [2020-07-21 16:00:58,381 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:58,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [630805319] [2020-07-21 16:00:58,382 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:00:58,517 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:58,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:58,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-21 16:00:58,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:58,811 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2020-07-21 16:00:58,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:59,766 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2020-07-21 16:00:59,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [630805319] [2020-07-21 16:00:59,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:59,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 28 [2020-07-21 16:00:59,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229012242] [2020-07-21 16:00:59,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 16:00:59,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:59,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 16:00:59,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=691, Unknown=0, NotChecked=0, Total=756 [2020-07-21 16:00:59,769 INFO L87 Difference]: Start difference. First operand 167 states and 257 transitions. Second operand 28 states. [2020-07-21 16:01:00,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:00,112 INFO L93 Difference]: Finished difference Result 175 states and 269 transitions. [2020-07-21 16:01:00,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 16:01:00,117 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 109 [2020-07-21 16:01:00,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:00,119 INFO L225 Difference]: With dead ends: 175 [2020-07-21 16:01:00,119 INFO L226 Difference]: Without dead ends: 171 [2020-07-21 16:01:00,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=65, Invalid=691, Unknown=0, NotChecked=0, Total=756 [2020-07-21 16:01:00,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2020-07-21 16:01:00,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 167. [2020-07-21 16:01:00,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2020-07-21 16:01:00,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 257 transitions. [2020-07-21 16:01:00,134 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 257 transitions. Word has length 109 [2020-07-21 16:01:00,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:00,135 INFO L479 AbstractCegarLoop]: Abstraction has 167 states and 257 transitions. [2020-07-21 16:01:00,135 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 16:01:00,135 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 257 transitions. [2020-07-21 16:01:00,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 16:01:00,137 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:00,138 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] [2020-07-21 16:01:00,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:00,351 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:00,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:00,352 INFO L82 PathProgramCache]: Analyzing trace with hash -77183713, now seen corresponding path program 9 times [2020-07-21 16:01:00,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:00,352 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1750721191] [2020-07-21 16:01:00,352 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:01:00,505 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:00,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:00,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 16:01:00,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:00,633 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 72 proven. 116 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2020-07-21 16:01:00,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:01,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:01,713 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 72 proven. 121 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-07-21 16:01:01,714 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1750721191] [2020-07-21 16:01:01,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:01,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16] total 21 [2020-07-21 16:01:01,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283432982] [2020-07-21 16:01:01,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:01:01,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:01,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:01:01,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:01,716 INFO L87 Difference]: Start difference. First operand 167 states and 257 transitions. Second operand 21 states. [2020-07-21 16:01:02,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:02,488 INFO L93 Difference]: Finished difference Result 332 states and 524 transitions. [2020-07-21 16:01:02,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 16:01:02,489 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 121 [2020-07-21 16:01:02,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:02,491 INFO L225 Difference]: With dead ends: 332 [2020-07-21 16:01:02,491 INFO L226 Difference]: Without dead ends: 171 [2020-07-21 16:01:02,492 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 215 SyntacticMatches, 13 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=222, Invalid=968, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:01:02,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2020-07-21 16:01:02,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 167. [2020-07-21 16:01:02,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2020-07-21 16:01:02,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 256 transitions. [2020-07-21 16:01:02,506 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 256 transitions. Word has length 121 [2020-07-21 16:01:02,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:02,508 INFO L479 AbstractCegarLoop]: Abstraction has 167 states and 256 transitions. [2020-07-21 16:01:02,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:01:02,508 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 256 transitions. [2020-07-21 16:01:02,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-21 16:01:02,511 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:02,512 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 13, 13, 9, 9, 8, 8, 8, 8, 8, 8, 8, 7, 6, 6, 6, 6, 6, 6, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:02,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:02,726 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:02,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:02,727 INFO L82 PathProgramCache]: Analyzing trace with hash 1167802887, now seen corresponding path program 10 times [2020-07-21 16:01:02,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:02,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1810524562] [2020-07-21 16:01:02,728 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:01:02,869 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:02,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:02,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:01:02,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:03,035 INFO L134 CoverageAnalysis]: Checked inductivity of 1036 backedges. 216 proven. 267 refuted. 0 times theorem prover too weak. 553 trivial. 0 not checked. [2020-07-21 16:01:03,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:04,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:04,901 INFO L134 CoverageAnalysis]: Checked inductivity of 1036 backedges. 216 proven. 279 refuted. 0 times theorem prover too weak. 541 trivial. 0 not checked. [2020-07-21 16:01:04,902 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1810524562] [2020-07-21 16:01:04,902 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:04,902 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25 [2020-07-21 16:01:04,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596600398] [2020-07-21 16:01:04,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:01:04,904 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:04,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:01:04,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:01:04,908 INFO L87 Difference]: Start difference. First operand 167 states and 256 transitions. Second operand 25 states. [2020-07-21 16:01:05,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:05,988 INFO L93 Difference]: Finished difference Result 416 states and 748 transitions. [2020-07-21 16:01:05,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-21 16:01:05,989 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 199 [2020-07-21 16:01:05,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:05,992 INFO L225 Difference]: With dead ends: 416 [2020-07-21 16:01:05,992 INFO L226 Difference]: Without dead ends: 255 [2020-07-21 16:01:05,994 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 359 SyntacticMatches, 15 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=340, Invalid=1640, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 16:01:05,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2020-07-21 16:01:06,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 207. [2020-07-21 16:01:06,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2020-07-21 16:01:06,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 353 transitions. [2020-07-21 16:01:06,012 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 353 transitions. Word has length 199 [2020-07-21 16:01:06,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:06,012 INFO L479 AbstractCegarLoop]: Abstraction has 207 states and 353 transitions. [2020-07-21 16:01:06,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:01:06,013 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 353 transitions. [2020-07-21 16:01:06,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2020-07-21 16:01:06,017 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:06,017 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 13, 11, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 7, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:06,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:06,232 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:06,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:06,232 INFO L82 PathProgramCache]: Analyzing trace with hash -2036888544, now seen corresponding path program 11 times [2020-07-21 16:01:06,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:06,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [375579805] [2020-07-21 16:01:06,233 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:01:06,391 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:06,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:06,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:01:06,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:06,505 INFO L134 CoverageAnalysis]: Checked inductivity of 1545 backedges. 668 proven. 32 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2020-07-21 16:01:06,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:07,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:07,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:07,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:07,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:08,025 INFO L134 CoverageAnalysis]: Checked inductivity of 1545 backedges. 109 proven. 387 refuted. 0 times theorem prover too weak. 1049 trivial. 0 not checked. [2020-07-21 16:01:08,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [375579805] [2020-07-21 16:01:08,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:08,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:01:08,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979498048] [2020-07-21 16:01:08,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:01:08,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:08,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:01:08,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:01:08,028 INFO L87 Difference]: Start difference. First operand 207 states and 353 transitions. Second operand 17 states. [2020-07-21 16:01:08,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:08,476 INFO L93 Difference]: Finished difference Result 417 states and 726 transitions. [2020-07-21 16:01:08,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 16:01:08,477 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 241 [2020-07-21 16:01:08,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:08,479 INFO L225 Difference]: With dead ends: 417 [2020-07-21 16:01:08,479 INFO L226 Difference]: Without dead ends: 215 [2020-07-21 16:01:08,481 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 455 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:01:08,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2020-07-21 16:01:08,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 194. [2020-07-21 16:01:08,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2020-07-21 16:01:08,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 318 transitions. [2020-07-21 16:01:08,494 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 318 transitions. Word has length 241 [2020-07-21 16:01:08,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:08,494 INFO L479 AbstractCegarLoop]: Abstraction has 194 states and 318 transitions. [2020-07-21 16:01:08,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:01:08,494 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 318 transitions. [2020-07-21 16:01:08,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-21 16:01:08,496 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:08,496 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:08,711 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:08,712 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:08,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:08,713 INFO L82 PathProgramCache]: Analyzing trace with hash -1996526584, now seen corresponding path program 3 times [2020-07-21 16:01:08,713 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:08,713 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [782668562] [2020-07-21 16:01:08,713 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:01:08,859 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:08,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:08,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 16:01:08,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:08,939 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 255 proven. 11 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-21 16:01:08,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:09,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:09,767 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 61 proven. 119 refuted. 0 times theorem prover too weak. 270 trivial. 0 not checked. [2020-07-21 16:01:09,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [782668562] [2020-07-21 16:01:09,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:09,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-21 16:01:09,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49822973] [2020-07-21 16:01:09,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:01:09,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:09,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:01:09,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:01:09,769 INFO L87 Difference]: Start difference. First operand 194 states and 318 transitions. Second operand 14 states. [2020-07-21 16:01:09,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:09,992 INFO L93 Difference]: Finished difference Result 374 states and 640 transitions. [2020-07-21 16:01:09,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:01:09,993 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 133 [2020-07-21 16:01:09,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:09,995 INFO L225 Difference]: With dead ends: 374 [2020-07-21 16:01:09,995 INFO L226 Difference]: Without dead ends: 184 [2020-07-21 16:01:09,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 246 SyntacticMatches, 7 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:01:09,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-07-21 16:01:10,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 184. [2020-07-21 16:01:10,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-07-21 16:01:10,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 292 transitions. [2020-07-21 16:01:10,008 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 292 transitions. Word has length 133 [2020-07-21 16:01:10,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:10,008 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 292 transitions. [2020-07-21 16:01:10,008 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:01:10,008 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 292 transitions. [2020-07-21 16:01:10,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-21 16:01:10,010 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:10,011 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] [2020-07-21 16:01:10,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:10,225 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:10,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:10,225 INFO L82 PathProgramCache]: Analyzing trace with hash -71686390, now seen corresponding path program 12 times [2020-07-21 16:01:10,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:10,225 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047617246] [2020-07-21 16:01:10,225 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:01:10,376 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:10,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:10,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:01:10,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:10,476 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 256 proven. 51 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2020-07-21 16:01:10,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:11,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,557 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 90 proven. 126 refuted. 0 times theorem prover too weak. 202 trivial. 0 not checked. [2020-07-21 16:01:11,557 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047617246] [2020-07-21 16:01:11,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:11,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 19 [2020-07-21 16:01:11,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229060841] [2020-07-21 16:01:11,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:01:11,558 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:11,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:01:11,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:01:11,559 INFO L87 Difference]: Start difference. First operand 184 states and 292 transitions. Second operand 19 states. [2020-07-21 16:01:12,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:12,038 INFO L93 Difference]: Finished difference Result 364 states and 598 transitions. [2020-07-21 16:01:12,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 16:01:12,039 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 133 [2020-07-21 16:01:12,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:12,041 INFO L225 Difference]: With dead ends: 364 [2020-07-21 16:01:12,041 INFO L226 Difference]: Without dead ends: 186 [2020-07-21 16:01:12,043 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 237 SyntacticMatches, 11 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=168, Invalid=702, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:01:12,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2020-07-21 16:01:12,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 184. [2020-07-21 16:01:12,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-07-21 16:01:12,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 286 transitions. [2020-07-21 16:01:12,054 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 286 transitions. Word has length 133 [2020-07-21 16:01:12,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:12,055 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 286 transitions. [2020-07-21 16:01:12,055 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:01:12,055 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 286 transitions. [2020-07-21 16:01:12,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2020-07-21 16:01:12,058 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:12,058 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 18, 18, 12, 11, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:12,272 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:12,273 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:12,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:12,274 INFO L82 PathProgramCache]: Analyzing trace with hash 737998076, now seen corresponding path program 13 times [2020-07-21 16:01:12,274 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:12,275 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [216050658] [2020-07-21 16:01:12,275 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:01:12,450 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:12,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:12,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:01:12,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:12,680 INFO L134 CoverageAnalysis]: Checked inductivity of 1897 backedges. 301 proven. 460 refuted. 0 times theorem prover too weak. 1136 trivial. 0 not checked. [2020-07-21 16:01:12,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:13,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:15,108 INFO L134 CoverageAnalysis]: Checked inductivity of 1897 backedges. 301 proven. 475 refuted. 0 times theorem prover too weak. 1121 trivial. 0 not checked. [2020-07-21 16:01:15,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [216050658] [2020-07-21 16:01:15,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:15,109 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 16:01:15,109 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357469777] [2020-07-21 16:01:15,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:01:15,110 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:15,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:01:15,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:01:15,111 INFO L87 Difference]: Start difference. First operand 184 states and 286 transitions. Second operand 25 states. [2020-07-21 16:01:16,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:16,256 INFO L93 Difference]: Finished difference Result 453 states and 782 transitions. [2020-07-21 16:01:16,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 16:01:16,260 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 264 [2020-07-21 16:01:16,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:16,264 INFO L225 Difference]: With dead ends: 453 [2020-07-21 16:01:16,264 INFO L226 Difference]: Without dead ends: 248 [2020-07-21 16:01:16,268 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 549 GetRequests, 486 SyntacticMatches, 19 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 363 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=348, Invalid=1722, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 16:01:16,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2020-07-21 16:01:16,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 218. [2020-07-21 16:01:16,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2020-07-21 16:01:16,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 345 transitions. [2020-07-21 16:01:16,286 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 345 transitions. Word has length 264 [2020-07-21 16:01:16,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:16,287 INFO L479 AbstractCegarLoop]: Abstraction has 218 states and 345 transitions. [2020-07-21 16:01:16,287 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:01:16,287 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 345 transitions. [2020-07-21 16:01:16,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-21 16:01:16,289 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:16,289 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] [2020-07-21 16:01:16,503 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:16,504 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:16,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:16,504 INFO L82 PathProgramCache]: Analyzing trace with hash 247206723, now seen corresponding path program 14 times [2020-07-21 16:01:16,505 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:16,505 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1116579149] [2020-07-21 16:01:16,505 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:01:16,699 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:16,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:16,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 16:01:16,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:16,871 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 137 proven. 143 refuted. 0 times theorem prover too weak. 230 trivial. 0 not checked. [2020-07-21 16:01:16,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:17,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:17,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:17,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:17,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,375 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 136 proven. 150 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2020-07-21 16:01:18,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1116579149] [2020-07-21 16:01:18,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:18,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18] total 23 [2020-07-21 16:01:18,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570071054] [2020-07-21 16:01:18,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:01:18,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:18,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:01:18,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:01:18,377 INFO L87 Difference]: Start difference. First operand 218 states and 345 transitions. Second operand 23 states. [2020-07-21 16:01:19,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:19,137 INFO L93 Difference]: Finished difference Result 437 states and 715 transitions. [2020-07-21 16:01:19,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 16:01:19,143 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 145 [2020-07-21 16:01:19,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:19,145 INFO L225 Difference]: With dead ends: 437 [2020-07-21 16:01:19,145 INFO L226 Difference]: Without dead ends: 224 [2020-07-21 16:01:19,148 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 254 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=233, Invalid=1099, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:01:19,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2020-07-21 16:01:19,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 217. [2020-07-21 16:01:19,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2020-07-21 16:01:19,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 325 transitions. [2020-07-21 16:01:19,161 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 325 transitions. Word has length 145 [2020-07-21 16:01:19,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:19,162 INFO L479 AbstractCegarLoop]: Abstraction has 217 states and 325 transitions. [2020-07-21 16:01:19,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:01:19,162 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 325 transitions. [2020-07-21 16:01:19,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-07-21 16:01:19,164 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:19,164 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:19,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:19,399 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:19,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:19,399 INFO L82 PathProgramCache]: Analyzing trace with hash -754125023, now seen corresponding path program 4 times [2020-07-21 16:01:19,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:19,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1466879129] [2020-07-21 16:01:19,400 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:01:19,592 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:19,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:19,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:01:19,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:19,689 INFO L134 CoverageAnalysis]: Checked inductivity of 726 backedges. 71 proven. 188 refuted. 0 times theorem prover too weak. 467 trivial. 0 not checked. [2020-07-21 16:01:19,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:20,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:20,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,002 INFO L134 CoverageAnalysis]: Checked inductivity of 726 backedges. 69 proven. 198 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2020-07-21 16:01:21,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1466879129] [2020-07-21 16:01:21,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:21,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-21 16:01:21,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384846577] [2020-07-21 16:01:21,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:01:21,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:21,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:01:21,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:01:21,003 INFO L87 Difference]: Start difference. First operand 217 states and 325 transitions. Second operand 17 states. [2020-07-21 16:01:21,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:21,268 INFO L93 Difference]: Finished difference Result 217 states and 325 transitions. [2020-07-21 16:01:21,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:01:21,269 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 169 [2020-07-21 16:01:21,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:21,270 INFO L225 Difference]: With dead ends: 217 [2020-07-21 16:01:21,270 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 16:01:21,273 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 311 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:01:21,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 16:01:21,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 16:01:21,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 16:01:21,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 16:01:21,274 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 169 [2020-07-21 16:01:21,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:21,274 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 16:01:21,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:01:21,275 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 16:01:21,275 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 16:01:21,483 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:21,487 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 16:01:23,123 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 59 [2020-07-21 16:01:24,016 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 9 [2020-07-21 16:01:24,175 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 1 [2020-07-21 16:01:24,362 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 1 [2020-07-21 16:01:24,893 WARN L193 SmtUtils]: Spent 523.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 23 [2020-07-21 16:01:25,108 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 7 [2020-07-21 16:01:25,753 WARN L193 SmtUtils]: Spent 634.00 ms on a formula simplification. DAG size of input: 157 DAG size of output: 27 [2020-07-21 16:01:25,758 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 16:01:25,758 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:01:25,758 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:01:25,759 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 16:01:25,759 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 16:01:25,759 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 16:01:25,759 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2020-07-21 16:01:25,759 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 35 42) the Hoare annotation is: true [2020-07-21 16:01:25,759 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 35 42) no Hoare annotation was computed. [2020-07-21 16:01:25,759 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 35 42) no Hoare annotation was computed. [2020-07-21 16:01:25,760 INFO L268 CegarLoopResult]: For program point L39(line 39) no Hoare annotation was computed. [2020-07-21 16:01:25,760 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-21 16:01:25,760 INFO L264 CegarLoopResult]: At program point L37(line 37) the Hoare annotation is: (and (<= main_~x~0 5) (<= 5 main_~x~0)) [2020-07-21 16:01:25,760 INFO L268 CegarLoopResult]: For program point L37-1(line 37) no Hoare annotation was computed. [2020-07-21 16:01:25,760 INFO L268 CegarLoopResult]: For program point L38-2(lines 38 40) no Hoare annotation was computed. [2020-07-21 16:01:25,760 INFO L271 CegarLoopResult]: At program point fibo2ENTRY(lines 17 25) the Hoare annotation is: true [2020-07-21 16:01:25,760 INFO L264 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n) (not (<= |fibo2_#in~n| 2))) [2020-07-21 16:01:25,760 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-21 16:01:25,761 INFO L264 CegarLoopResult]: At program point L23-2(line 23) the Hoare annotation is: (let ((.cse0 (<= fibo2_~n |fibo2_#in~n|))) (or (and .cse0 (<= |fibo2_#in~n| fibo2_~n) (<= 5 fibo2_~n)) (and (<= 3 |fibo2_#in~n|) (= 1 |fibo2_#t~ret2|) (<= |fibo2_#in~n| 3) (<= 3 fibo2_~n) (<= fibo2_~n 3)) (and .cse0 (<= |fibo2_#in~n| 4) (= 2 |fibo2_#t~ret2|) (<= 4 fibo2_~n)))) [2020-07-21 16:01:25,761 INFO L268 CegarLoopResult]: For program point L20(lines 20 24) no Hoare annotation was computed. [2020-07-21 16:01:25,761 INFO L268 CegarLoopResult]: For program point L23-3(line 23) no Hoare annotation was computed. [2020-07-21 16:01:25,761 INFO L268 CegarLoopResult]: For program point L18(lines 18 24) no Hoare annotation was computed. [2020-07-21 16:01:25,761 INFO L268 CegarLoopResult]: For program point fibo2FINAL(lines 17 25) no Hoare annotation was computed. [2020-07-21 16:01:25,761 INFO L268 CegarLoopResult]: For program point fibo2EXIT(lines 17 25) no Hoare annotation was computed. [2020-07-21 16:01:25,761 INFO L271 CegarLoopResult]: At program point fibo1ENTRY(lines 7 15) the Hoare annotation is: true [2020-07-21 16:01:25,762 INFO L264 CegarLoopResult]: At program point L13(line 13) the Hoare annotation is: (and (<= 2 |fibo1_#in~n|) (<= fibo1_~n |fibo1_#in~n|) (<= |fibo1_#in~n| fibo1_~n)) [2020-07-21 16:01:25,762 INFO L268 CegarLoopResult]: For program point L13-1(line 13) no Hoare annotation was computed. [2020-07-21 16:01:25,762 INFO L264 CegarLoopResult]: At program point L13-2(line 13) the Hoare annotation is: (let ((.cse2 (<= |fibo1_#in~n| 2)) (.cse1 (<= fibo1_~n |fibo1_#in~n|))) (and (let ((.cse0 (<= |fibo1_#in~n| fibo1_~n))) (or (and (<= fibo1_~n 4) .cse0) (and .cse1 (<= 6 fibo1_~n) .cse0) (and .cse1 (= 3 |fibo1_#t~ret0|) .cse0))) (or (not (<= |fibo1_#in~n| 3)) .cse2) (or (not .cse2) (and (<= 2 |fibo1_#in~n|) .cse1 (= 1 |fibo1_#t~ret0|))))) [2020-07-21 16:01:25,762 INFO L268 CegarLoopResult]: For program point fibo1FINAL(lines 7 15) no Hoare annotation was computed. [2020-07-21 16:01:25,762 INFO L268 CegarLoopResult]: For program point L10(lines 10 14) no Hoare annotation was computed. [2020-07-21 16:01:25,762 INFO L268 CegarLoopResult]: For program point L13-3(line 13) no Hoare annotation was computed. [2020-07-21 16:01:25,762 INFO L268 CegarLoopResult]: For program point L8(lines 8 14) no Hoare annotation was computed. [2020-07-21 16:01:25,762 INFO L268 CegarLoopResult]: For program point fibo1EXIT(lines 7 15) no Hoare annotation was computed. [2020-07-21 16:01:25,768 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:01:25 BoogieIcfgContainer [2020-07-21 16:01:25,769 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:01:25,770 INFO L168 Benchmark]: Toolchain (without parser) took 56325.23 ms. Allocated memory was 146.3 MB in the beginning and 537.9 MB in the end (delta: 391.6 MB). Free memory was 104.0 MB in the beginning and 445.3 MB in the end (delta: -341.4 MB). Peak memory consumption was 411.5 MB. Max. memory is 7.1 GB. [2020-07-21 16:01:25,771 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 146.3 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 16:01:25,771 INFO L168 Benchmark]: CACSL2BoogieTranslator took 235.56 ms. Allocated memory is still 146.3 MB. Free memory was 103.5 MB in the beginning and 94.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 16:01:25,771 INFO L168 Benchmark]: Boogie Preprocessor took 118.85 ms. Allocated memory was 146.3 MB in the beginning and 203.4 MB in the end (delta: 57.1 MB). Free memory was 94.0 MB in the beginning and 182.7 MB in the end (delta: -88.7 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-07-21 16:01:25,772 INFO L168 Benchmark]: RCFGBuilder took 266.30 ms. Allocated memory is still 203.4 MB. Free memory was 182.7 MB in the beginning and 169.2 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. [2020-07-21 16:01:25,772 INFO L168 Benchmark]: TraceAbstraction took 55698.03 ms. Allocated memory was 203.4 MB in the beginning and 537.9 MB in the end (delta: 334.5 MB). Free memory was 168.5 MB in the beginning and 445.3 MB in the end (delta: -276.8 MB). Peak memory consumption was 418.9 MB. Max. memory is 7.1 GB. [2020-07-21 16:01:25,774 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 146.3 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 235.56 ms. Allocated memory is still 146.3 MB. Free memory was 103.5 MB in the beginning and 94.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 118.85 ms. Allocated memory was 146.3 MB in the beginning and 203.4 MB in the end (delta: 57.1 MB). Free memory was 94.0 MB in the beginning and 182.7 MB in the end (delta: -88.7 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 266.30 ms. Allocated memory is still 203.4 MB. Free memory was 182.7 MB in the beginning and 169.2 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 55698.03 ms. Allocated memory was 203.4 MB in the beginning and 537.9 MB in the end (delta: 334.5 MB). Free memory was 168.5 MB in the beginning and 445.3 MB in the end (delta: -276.8 MB). Peak memory consumption was 418.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 39]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 51.2s, OverallIterations: 31, TraceHistogramMax: 21, AutomataDifference: 12.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 4.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 947 SDtfs, 1826 SDslu, 7418 SDs, 0 SdLazy, 8459 SolverSat, 1822 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 6456 GetRequests, 5492 SyntacticMatches, 280 SemanticMatches, 684 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2743 ImplicationChecksByTransitivity, 10.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=218occurred in iteration=29, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 31 MinimizatonAttempts, 365 StatesRemovedByMinimization, 28 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 1589 PreInvPairs, 2572 NumberOfFragments, 126 HoareAnnotationTreeSize, 1589 FomulaSimplifications, 135186 FormulaSimplificationTreeSizeReduction, 2.2s HoareSimplificationTime, 11 FomulaSimplificationsInter, 97304 FormulaSimplificationTreeSizeReductionInter, 1.9s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.8s SatisfiabilityAnalysisTime, 28.4s InterpolantComputationTime, 3099 NumberOfCodeBlocks, 2341 NumberOfCodeBlocksAsserted, 50 NumberOfCheckSat, 6111 ConstructedInterpolants, 0 QuantifiedInterpolants, 1506933 SizeOfPredicates, 182 NumberOfNonLiveVariables, 5819 ConjunctsInSsa, 399 ConjunctsInUnsatCore, 60 InterpolantComputations, 2 PerfectInterpolantSequences, 15176/20444 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...