/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_8-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:34:52,926 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:34:52,928 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:34:52,941 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:34:52,942 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:34:52,943 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:34:52,944 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:34:52,946 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:34:52,948 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:34:52,949 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:34:52,950 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:34:52,951 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:34:52,951 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:34:52,952 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:34:52,953 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:34:52,955 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:34:52,958 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:34:52,960 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:34:52,964 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:34:52,966 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:34:52,971 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:34:52,973 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:34:52,976 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:34:52,977 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:34:52,979 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:34:52,992 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:34:52,993 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:34:52,995 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:34:52,996 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:34:53,035 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:34:53,035 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:34:53,040 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:34:53,040 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:34:53,042 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:34:53,043 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:34:53,043 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:34:53,043 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:34:53,043 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:34:53,043 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:34:53,044 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:34:53,044 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:34:53,044 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:34:53,044 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:34:53,045 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:34:53,046 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:34:53,046 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:34:53,046 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:34:53,046 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:34:53,046 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:34:53,047 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:34:53,047 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:34:53,047 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:34:53,047 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:34:53,047 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:34:53,048 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:34:53,048 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:53,048 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:34:53,048 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:34:53,048 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:34:53,343 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:34:53,359 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:34:53,363 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:34:53,365 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:34:53,365 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:34:53,366 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_8-2.c [2020-07-20 13:34:53,452 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/eddb2c74b/c68620bb19e5422f83418210a093e44d/FLAG543306c74 [2020-07-20 13:34:53,971 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:34:53,972 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_8-2.c [2020-07-20 13:34:53,980 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/eddb2c74b/c68620bb19e5422f83418210a093e44d/FLAG543306c74 [2020-07-20 13:34:54,355 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/eddb2c74b/c68620bb19e5422f83418210a093e44d [2020-07-20 13:34:54,366 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:34:54,370 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:34:54,371 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:34:54,372 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:34:54,375 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:34:54,376 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,380 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b58d8f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54, skipping insertion in model container [2020-07-20 13:34:54,380 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,388 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:34:54,407 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:34:54,576 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:34:54,581 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:34:54,599 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:34:54,615 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:34:54,615 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54 WrapperNode [2020-07-20 13:34:54,616 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:34:54,616 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:34:54,617 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:34:54,617 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:34:54,631 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,632 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,637 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,638 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,729 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,732 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,733 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (1/1) ... [2020-07-20 13:34:54,734 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:34:54,735 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:34:54,735 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:34:54,735 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:34:54,736 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:34:54,813 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:34:54,813 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:34:54,813 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 13:34:54,813 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 13:34:54,814 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:34:54,814 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:34:54,814 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:34:54,814 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 13:34:54,814 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 13:34:54,814 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:34:54,815 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:34:54,815 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:34:55,026 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:34:55,026 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:34:55,031 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:34:55 BoogieIcfgContainer [2020-07-20 13:34:55,032 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:34:55,033 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:34:55,033 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:34:55,038 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:34:55,038 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:34:54" (1/3) ... [2020-07-20 13:34:55,040 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43f3ff56 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:34:55, skipping insertion in model container [2020-07-20 13:34:55,040 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:54" (2/3) ... [2020-07-20 13:34:55,040 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43f3ff56 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:34:55, skipping insertion in model container [2020-07-20 13:34:55,041 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:34:55" (3/3) ... [2020-07-20 13:34:55,043 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_8-2.c [2020-07-20 13:34:55,057 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:34:55,066 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:34:55,089 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:34:55,129 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:34:55,130 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:34:55,130 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:34:55,130 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:34:55,130 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:34:55,131 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:34:55,131 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:34:55,131 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:34:55,159 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 13:34:55,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:34:55,166 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:55,167 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:55,168 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:55,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:55,175 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 13:34:55,185 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:55,186 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1230502077] [2020-07-20 13:34:55,187 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:55,257 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:55,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:55,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:34:55,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:55,369 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:34:55,370 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:34:55,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1230502077] [2020-07-20 13:34:55,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:34:55,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:34:55,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27115042] [2020-07-20 13:34:55,378 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:34:55,378 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:55,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:34:55,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:34:55,392 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 13:34:55,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:55,517 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 13:34:55,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:34:55,520 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:34:55,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:55,539 INFO L225 Difference]: With dead ends: 44 [2020-07-20 13:34:55,539 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 13:34:55,543 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:34:55,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 13:34:55,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 13:34:55,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 13:34:55,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 13:34:55,597 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 13:34:55,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:55,598 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 13:34:55,598 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:34:55,599 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 13:34:55,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 13:34:55,601 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:55,601 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:55,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:55,816 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:55,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:55,817 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 13:34:55,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:55,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [237570538] [2020-07-20 13:34:55,819 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:55,844 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:55,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:55,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:34:55,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:55,893 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:34:55,894 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:34:55,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [237570538] [2020-07-20 13:34:55,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:34:55,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:34:55,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333478209] [2020-07-20 13:34:55,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:34:55,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:55,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:34:55,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:34:55,905 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 13:34:56,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:56,014 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 13:34:56,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:34:56,016 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 13:34:56,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:56,019 INFO L225 Difference]: With dead ends: 36 [2020-07-20 13:34:56,019 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 13:34:56,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:34:56,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 13:34:56,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 13:34:56,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 13:34:56,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 13:34:56,044 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 13:34:56,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:56,044 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 13:34:56,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:34:56,045 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 13:34:56,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:34:56,049 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:56,050 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:56,265 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:56,265 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:56,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:56,268 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 13:34:56,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:56,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [956216860] [2020-07-20 13:34:56,269 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:56,316 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:56,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:56,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:34:56,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:56,369 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:34:56,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:56,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,648 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:34:56,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [956216860] [2020-07-20 13:34:56,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:56,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 13:34:56,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454677848] [2020-07-20 13:34:56,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 13:34:56,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:56,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 13:34:56,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 13:34:56,652 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 13:34:56,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:56,766 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 13:34:56,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:34:56,767 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 13:34:56,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:56,769 INFO L225 Difference]: With dead ends: 41 [2020-07-20 13:34:56,769 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 13:34:56,770 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:34:56,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 13:34:56,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 13:34:56,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 13:34:56,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 13:34:56,780 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 13:34:56,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:56,781 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 13:34:56,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 13:34:56,781 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 13:34:56,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:34:56,782 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:56,783 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:56,995 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:56,996 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:56,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:56,997 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 13:34:56,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:56,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1825252413] [2020-07-20 13:34:56,998 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:57,027 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:57,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:57,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:34:57,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:57,083 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:34:57,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:57,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,302 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:34:57,303 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1825252413] [2020-07-20 13:34:57,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:57,303 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 13:34:57,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980264146] [2020-07-20 13:34:57,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 13:34:57,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:57,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 13:34:57,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 13:34:57,305 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 13:34:57,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:57,449 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 13:34:57,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:34:57,449 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 13:34:57,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:57,452 INFO L225 Difference]: With dead ends: 46 [2020-07-20 13:34:57,453 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 13:34:57,456 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:34:57,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 13:34:57,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 13:34:57,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 13:34:57,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 13:34:57,466 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 13:34:57,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:57,466 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 13:34:57,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 13:34:57,467 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 13:34:57,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 13:34:57,468 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:57,469 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:57,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:57,682 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:57,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:57,683 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 13:34:57,683 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:57,683 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [519172070] [2020-07-20 13:34:57,684 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:57,739 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:57,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:57,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:34:57,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:57,811 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 13:34:57,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:58,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,211 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:34:58,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [519172070] [2020-07-20 13:34:58,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:58,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 13:34:58,212 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507933760] [2020-07-20 13:34:58,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:34:58,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:58,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:34:58,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:34:58,214 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 13:34:58,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:58,389 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 13:34:58,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:34:58,390 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 13:34:58,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:58,392 INFO L225 Difference]: With dead ends: 51 [2020-07-20 13:34:58,392 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 13:34:58,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:34:58,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 13:34:58,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 13:34:58,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 13:34:58,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 13:34:58,404 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 13:34:58,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:58,404 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 13:34:58,405 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:34:58,405 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 13:34:58,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 13:34:58,408 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:58,408 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:58,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:58,621 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:58,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:58,621 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 13:34:58,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:58,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [859120831] [2020-07-20 13:34:58,623 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:58,657 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:58,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:58,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:34:58,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:58,709 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 13:34:58,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:58,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:58,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:59,032 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:34:59,033 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [859120831] [2020-07-20 13:34:59,033 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:59,033 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 13:34:59,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527877843] [2020-07-20 13:34:59,034 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:34:59,035 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:59,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:34:59,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:34:59,035 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 13:34:59,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:59,228 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-20 13:34:59,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:34:59,231 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 13:34:59,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:59,236 INFO L225 Difference]: With dead ends: 56 [2020-07-20 13:34:59,236 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 13:34:59,237 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:34:59,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 13:34:59,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-20 13:34:59,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 13:34:59,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 13:34:59,255 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-20 13:34:59,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:59,255 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 13:34:59,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:34:59,256 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 13:34:59,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 13:34:59,258 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:59,258 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:59,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:59,468 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:59,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:59,469 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-20 13:34:59,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:59,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [36763877] [2020-07-20 13:34:59,470 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:59,531 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:59,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:59,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:34:59,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:59,593 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 13:34:59,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:59,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:59,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:00,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:00,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:00,158 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 13:35:00,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [36763877] [2020-07-20 13:35:00,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:00,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 13:35:00,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145711810] [2020-07-20 13:35:00,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:35:00,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:00,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:35:00,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:35:00,160 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-20 13:35:00,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:00,394 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-20 13:35:00,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:00,394 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-20 13:35:00,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:00,396 INFO L225 Difference]: With dead ends: 61 [2020-07-20 13:35:00,397 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 13:35:00,398 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:35:00,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 13:35:00,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-20 13:35:00,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 13:35:00,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 13:35:00,413 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-20 13:35:00,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:00,413 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 13:35:00,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:35:00,413 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 13:35:00,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 13:35:00,416 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:00,416 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:00,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:00,622 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:00,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:00,623 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 13:35:00,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:00,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1576637649] [2020-07-20 13:35:00,624 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:00,664 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:00,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:00,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:35:00,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:00,739 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-20 13:35:00,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:01,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:01,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:01,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:01,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:01,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:01,268 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 13:35:01,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1576637649] [2020-07-20 13:35:01,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:01,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 13:35:01,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993882965] [2020-07-20 13:35:01,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:35:01,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:01,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:35:01,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:35:01,273 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-20 13:35:01,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:01,478 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-20 13:35:01,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:35:01,479 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-20 13:35:01,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:01,481 INFO L225 Difference]: With dead ends: 66 [2020-07-20 13:35:01,481 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 13:35:01,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:35:01,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 13:35:01,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-20 13:35:01,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 13:35:01,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 13:35:01,494 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-20 13:35:01,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:01,495 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 13:35:01,495 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:35:01,495 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 13:35:01,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 13:35:01,497 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:01,498 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:01,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:01,714 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:01,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:01,714 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-20 13:35:01,715 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:01,715 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1984287863] [2020-07-20 13:35:01,716 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:01,787 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:01,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:01,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:35:01,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:01,864 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 13:35:01,865 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:02,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,853 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-20 13:35:02,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1984287863] [2020-07-20 13:35:02,854 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:02,854 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 13:35:02,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388880270] [2020-07-20 13:35:02,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 13:35:02,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:02,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 13:35:02,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 13:35:02,856 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-20 13:35:03,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:03,110 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-20 13:35:03,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:35:03,111 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-20 13:35:03,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:03,113 INFO L225 Difference]: With dead ends: 71 [2020-07-20 13:35:03,113 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 13:35:03,116 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:35:03,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 13:35:03,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-20 13:35:03,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 13:35:03,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 13:35:03,128 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-20 13:35:03,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:03,129 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 13:35:03,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 13:35:03,129 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 13:35:03,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 13:35:03,131 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:03,132 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:03,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:03,338 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:03,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:03,339 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-20 13:35:03,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:03,339 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [299796925] [2020-07-20 13:35:03,339 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:03,403 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:03,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:03,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:35:03,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:03,502 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-20 13:35:03,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:04,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,473 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-20 13:35:04,473 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [299796925] [2020-07-20 13:35:04,474 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:04,474 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 13:35:04,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383144017] [2020-07-20 13:35:04,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 13:35:04,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:04,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 13:35:04,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 13:35:04,479 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 16 states. [2020-07-20 13:35:04,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:04,720 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-20 13:35:04,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:35:04,721 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 108 [2020-07-20 13:35:04,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:04,723 INFO L225 Difference]: With dead ends: 76 [2020-07-20 13:35:04,723 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 13:35:04,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:35:04,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 13:35:04,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-20 13:35:04,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 13:35:04,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 13:35:04,737 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-20 13:35:04,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:04,737 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 13:35:04,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 13:35:04,738 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 13:35:04,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-20 13:35:04,741 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:04,741 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:04,955 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:04,957 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:04,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:04,957 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-20 13:35:04,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:04,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1475423504] [2020-07-20 13:35:04,959 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:05,063 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:05,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:05,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:35:05,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:05,232 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-20 13:35:05,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:06,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:06,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-20 13:35:06,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1475423504] [2020-07-20 13:35:06,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:06,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 13:35:06,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721595467] [2020-07-20 13:35:06,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 13:35:06,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:06,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 13:35:06,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:35:06,907 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 18 states. [2020-07-20 13:35:07,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:07,196 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-20 13:35:07,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:35:07,197 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 208 [2020-07-20 13:35:07,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:07,200 INFO L225 Difference]: With dead ends: 81 [2020-07-20 13:35:07,200 INFO L226 Difference]: Without dead ends: 77 [2020-07-20 13:35:07,201 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:35:07,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-20 13:35:07,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-20 13:35:07,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 13:35:07,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 13:35:07,221 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-20 13:35:07,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:07,222 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 13:35:07,222 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 13:35:07,223 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 13:35:07,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 13:35:07,228 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:07,229 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:07,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:07,430 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:07,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:07,431 INFO L82 PathProgramCache]: Analyzing trace with hash 1180347891, now seen corresponding path program 2 times [2020-07-20 13:35:07,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:07,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [441687711] [2020-07-20 13:35:07,432 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:07,508 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:07,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:07,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:35:07,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:07,589 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 149 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-20 13:35:07,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:08,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:08,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:09,033 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 165 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2020-07-20 13:35:09,033 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [441687711] [2020-07-20 13:35:09,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:09,034 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 13:35:09,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860865723] [2020-07-20 13:35:09,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 13:35:09,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:09,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 13:35:09,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:35:09,037 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 18 states. [2020-07-20 13:35:09,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:09,316 INFO L93 Difference]: Finished difference Result 86 states and 174 transitions. [2020-07-20 13:35:09,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:35:09,317 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 121 [2020-07-20 13:35:09,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:09,320 INFO L225 Difference]: With dead ends: 86 [2020-07-20 13:35:09,320 INFO L226 Difference]: Without dead ends: 82 [2020-07-20 13:35:09,321 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 214 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:35:09,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-20 13:35:09,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-07-20 13:35:09,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 13:35:09,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 13:35:09,331 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 121 [2020-07-20 13:35:09,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:09,332 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 13:35:09,332 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 13:35:09,332 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 13:35:09,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2020-07-20 13:35:09,334 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:09,335 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 11, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:09,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:09,550 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:09,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:09,551 INFO L82 PathProgramCache]: Analyzing trace with hash 2099307065, now seen corresponding path program 5 times [2020-07-20 13:35:09,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:09,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1774499064] [2020-07-20 13:35:09,552 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:09,670 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:09,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:09,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:35:09,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:09,812 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 331 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-07-20 13:35:09,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:11,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:12,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 352 refuted. 0 times theorem prover too weak. 609 trivial. 0 not checked. [2020-07-20 13:35:12,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1774499064] [2020-07-20 13:35:12,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:12,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 13:35:12,184 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050977839] [2020-07-20 13:35:12,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 13:35:12,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:12,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 13:35:12,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:35:12,186 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 20 states. [2020-07-20 13:35:12,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:12,593 INFO L93 Difference]: Finished difference Result 91 states and 192 transitions. [2020-07-20 13:35:12,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:35:12,594 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 195 [2020-07-20 13:35:12,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:12,597 INFO L225 Difference]: With dead ends: 91 [2020-07-20 13:35:12,597 INFO L226 Difference]: Without dead ends: 87 [2020-07-20 13:35:12,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 359 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:35:12,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-20 13:35:12,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 60. [2020-07-20 13:35:12,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 13:35:12,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 13:35:12,609 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 195 [2020-07-20 13:35:12,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:12,610 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 13:35:12,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 13:35:12,610 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 13:35:12,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-20 13:35:12,613 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:12,613 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 12, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:12,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:12,827 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:12,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:12,828 INFO L82 PathProgramCache]: Analyzing trace with hash 266210309, now seen corresponding path program 3 times [2020-07-20 13:35:12,829 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:12,829 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [129983141] [2020-07-20 13:35:12,830 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:12,970 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:12,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:12,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:35:12,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:13,092 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 347 refuted. 0 times theorem prover too weak. 658 trivial. 0 not checked. [2020-07-20 13:35:13,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:14,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:15,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:15,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:15,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:15,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:15,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:15,481 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 371 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2020-07-20 13:35:15,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [129983141] [2020-07-20 13:35:15,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:15,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:35:15,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381798940] [2020-07-20 13:35:15,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:35:15,483 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:15,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:35:15,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:35:15,484 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 19 states. [2020-07-20 13:35:15,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:15,858 INFO L93 Difference]: Finished difference Result 96 states and 212 transitions. [2020-07-20 13:35:15,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:35:15,858 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 201 [2020-07-20 13:35:15,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:15,865 INFO L225 Difference]: With dead ends: 96 [2020-07-20 13:35:15,865 INFO L226 Difference]: Without dead ends: 92 [2020-07-20 13:35:15,866 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 370 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:35:15,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-07-20 13:35:15,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 60. [2020-07-20 13:35:15,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 13:35:15,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 13:35:15,887 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 201 [2020-07-20 13:35:15,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:15,892 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 13:35:15,892 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:35:15,892 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 13:35:15,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-20 13:35:15,903 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:15,903 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 22, 21, 21, 16, 16, 16, 16, 16, 16, 16, 16, 10, 10, 10, 10, 10, 10, 10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:16,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:16,118 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:16,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:16,119 INFO L82 PathProgramCache]: Analyzing trace with hash -865443995, now seen corresponding path program 6 times [2020-07-20 13:35:16,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:16,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1831868315] [2020-07-20 13:35:16,120 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:16,303 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:16,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:16,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 642 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:35:16,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:16,489 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 819 refuted. 0 times theorem prover too weak. 2713 trivial. 0 not checked. [2020-07-20 13:35:16,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:18,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:18,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:19,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:19,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:19,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:19,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:19,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:19,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:20,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:20,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:20,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:20,279 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 849 refuted. 0 times theorem prover too weak. 2683 trivial. 0 not checked. [2020-07-20 13:35:20,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1831868315] [2020-07-20 13:35:20,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:20,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:35:20,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938115886] [2020-07-20 13:35:20,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:35:20,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:20,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:35:20,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:35:20,281 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 21 states. [2020-07-20 13:35:20,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:20,765 INFO L93 Difference]: Finished difference Result 101 states and 232 transitions. [2020-07-20 13:35:20,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:35:20,766 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 351 [2020-07-20 13:35:20,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:20,769 INFO L225 Difference]: With dead ends: 101 [2020-07-20 13:35:20,769 INFO L226 Difference]: Without dead ends: 97 [2020-07-20 13:35:20,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 667 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:35:20,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-20 13:35:20,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 65. [2020-07-20 13:35:20,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 13:35:20,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-20 13:35:20,790 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 351 [2020-07-20 13:35:20,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:20,791 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-20 13:35:20,791 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:35:20,791 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-20 13:35:20,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2020-07-20 13:35:20,794 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:20,795 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 19, 17, 17, 13, 13, 13, 13, 13, 13, 13, 13, 11, 8, 8, 8, 8, 8, 8, 8, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:21,007 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:21,008 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:21,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:21,009 INFO L82 PathProgramCache]: Analyzing trace with hash -1494010988, now seen corresponding path program 3 times [2020-07-20 13:35:21,009 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:21,009 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [622192498] [2020-07-20 13:35:21,009 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:21,216 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:21,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:21,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:35:21,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:21,356 INFO L134 CoverageAnalysis]: Checked inductivity of 2517 backedges. 124 proven. 533 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 13:35:21,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:22,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:22,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:23,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:23,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:23,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:23,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:23,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:24,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:24,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:24,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:24,246 INFO L134 CoverageAnalysis]: Checked inductivity of 2517 backedges. 124 proven. 554 refuted. 0 times theorem prover too weak. 1839 trivial. 0 not checked. [2020-07-20 13:35:24,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [622192498] [2020-07-20 13:35:24,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:24,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:35:24,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315496826] [2020-07-20 13:35:24,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:35:24,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:24,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:35:24,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:35:24,256 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 19 states. [2020-07-20 13:35:24,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:24,618 INFO L93 Difference]: Finished difference Result 129 states and 362 transitions. [2020-07-20 13:35:24,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:35:24,619 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 297 [2020-07-20 13:35:24,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:24,623 INFO L225 Difference]: With dead ends: 129 [2020-07-20 13:35:24,623 INFO L226 Difference]: Without dead ends: 125 [2020-07-20 13:35:24,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 562 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:35:24,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-07-20 13:35:24,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 67. [2020-07-20 13:35:24,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-07-20 13:35:24,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 120 transitions. [2020-07-20 13:35:24,639 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 120 transitions. Word has length 297 [2020-07-20 13:35:24,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:24,640 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 120 transitions. [2020-07-20 13:35:24,640 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:35:24,640 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 120 transitions. [2020-07-20 13:35:24,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2020-07-20 13:35:24,643 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:24,644 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 25, 25, 25, 23, 17, 17, 17, 17, 17, 17, 17, 12, 12, 12, 12, 12, 12, 12, 11, 11, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:24,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:24,859 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:24,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:24,859 INFO L82 PathProgramCache]: Analyzing trace with hash -948476032, now seen corresponding path program 1 times [2020-07-20 13:35:24,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:24,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [934420916] [2020-07-20 13:35:24,860 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:25,133 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:25,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:25,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 745 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:35:25,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:25,279 INFO L134 CoverageAnalysis]: Checked inductivity of 4805 backedges. 168 proven. 707 refuted. 0 times theorem prover too weak. 3930 trivial. 0 not checked. [2020-07-20 13:35:25,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:26,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:27,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:27,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:27,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:27,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:27,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:27,730 INFO L134 CoverageAnalysis]: Checked inductivity of 4805 backedges. 168 proven. 723 refuted. 0 times theorem prover too weak. 3914 trivial. 0 not checked. [2020-07-20 13:35:27,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [934420916] [2020-07-20 13:35:27,731 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:27,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:35:27,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998657551] [2020-07-20 13:35:27,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:35:27,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:27,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:35:27,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:27,734 INFO L87 Difference]: Start difference. First operand 67 states and 120 transitions. Second operand 17 states. [2020-07-20 13:35:28,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:28,060 INFO L93 Difference]: Finished difference Result 139 states and 413 transitions. [2020-07-20 13:35:28,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:35:28,061 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 409 [2020-07-20 13:35:28,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:28,065 INFO L225 Difference]: With dead ends: 139 [2020-07-20 13:35:28,065 INFO L226 Difference]: Without dead ends: 135 [2020-07-20 13:35:28,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 824 GetRequests, 790 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:35:28,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-07-20 13:35:28,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 69. [2020-07-20 13:35:28,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-07-20 13:35:28,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 127 transitions. [2020-07-20 13:35:28,088 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 127 transitions. Word has length 409 [2020-07-20 13:35:28,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:28,088 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 127 transitions. [2020-07-20 13:35:28,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:35:28,089 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 127 transitions. [2020-07-20 13:35:28,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 532 [2020-07-20 13:35:28,093 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:28,094 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 33, 33, 32, 30, 22, 22, 22, 22, 22, 22, 22, 16, 16, 16, 16, 16, 16, 16, 14, 14, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:28,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:28,309 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:28,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:28,310 INFO L82 PathProgramCache]: Analyzing trace with hash -1385064961, now seen corresponding path program 1 times [2020-07-20 13:35:28,310 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:28,311 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [567837425] [2020-07-20 13:35:28,311 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:28,598 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:28,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:28,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 964 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:35:28,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:28,967 INFO L134 CoverageAnalysis]: Checked inductivity of 8231 backedges. 323 proven. 1216 refuted. 0 times theorem prover too weak. 6692 trivial. 0 not checked. [2020-07-20 13:35:28,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:31,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:32,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:32,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:32,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:33,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:33,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:33,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:33,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:33,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:33,506 INFO L134 CoverageAnalysis]: Checked inductivity of 8231 backedges. 327 proven. 1245 refuted. 0 times theorem prover too weak. 6659 trivial. 0 not checked. [2020-07-20 13:35:33,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [567837425] [2020-07-20 13:35:33,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:33,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:35:33,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041942528] [2020-07-20 13:35:33,508 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:35:33,509 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:33,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:35:33,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:35:33,509 INFO L87 Difference]: Start difference. First operand 69 states and 127 transitions. Second operand 21 states. [2020-07-20 13:35:34,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:34,067 INFO L93 Difference]: Finished difference Result 166 states and 566 transitions. [2020-07-20 13:35:34,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:35:34,068 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 531 [2020-07-20 13:35:34,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:34,070 INFO L225 Difference]: With dead ends: 166 [2020-07-20 13:35:34,070 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 13:35:34,073 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1069 GetRequests, 1025 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:35:34,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 13:35:34,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-07-20 13:35:34,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-07-20 13:35:34,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 146 transitions. [2020-07-20 13:35:34,084 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 146 transitions. Word has length 531 [2020-07-20 13:35:34,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:34,085 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 146 transitions. [2020-07-20 13:35:34,085 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:35:34,085 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 146 transitions. [2020-07-20 13:35:34,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 459 [2020-07-20 13:35:34,090 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:34,090 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 25, 24, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 9, 9, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:34,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:34,325 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:34,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:34,326 INFO L82 PathProgramCache]: Analyzing trace with hash -1214630406, now seen corresponding path program 2 times [2020-07-20 13:35:34,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:34,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739182872] [2020-07-20 13:35:34,327 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:34,619 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:34,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:34,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 833 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:35:34,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:34,859 INFO L134 CoverageAnalysis]: Checked inductivity of 5956 backedges. 232 proven. 884 refuted. 0 times theorem prover too weak. 4840 trivial. 0 not checked. [2020-07-20 13:35:34,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:36,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:36,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:37,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:37,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:37,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:37,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:38,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:38,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:38,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:38,262 INFO L134 CoverageAnalysis]: Checked inductivity of 5956 backedges. 232 proven. 905 refuted. 0 times theorem prover too weak. 4819 trivial. 0 not checked. [2020-07-20 13:35:38,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [739182872] [2020-07-20 13:35:38,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:38,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:35:38,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560990116] [2020-07-20 13:35:38,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:35:38,265 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:38,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:35:38,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:35:38,265 INFO L87 Difference]: Start difference. First operand 88 states and 146 transitions. Second operand 19 states. [2020-07-20 13:35:38,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:38,673 INFO L93 Difference]: Finished difference Result 167 states and 414 transitions. [2020-07-20 13:35:38,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:35:38,674 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 458 [2020-07-20 13:35:38,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:38,678 INFO L225 Difference]: With dead ends: 167 [2020-07-20 13:35:38,678 INFO L226 Difference]: Without dead ends: 153 [2020-07-20 13:35:38,680 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 922 GetRequests, 883 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:35:38,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2020-07-20 13:35:38,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 94. [2020-07-20 13:35:38,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-20 13:35:38,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 160 transitions. [2020-07-20 13:35:38,696 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 160 transitions. Word has length 458 [2020-07-20 13:35:38,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:38,697 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 160 transitions. [2020-07-20 13:35:38,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:35:38,697 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 160 transitions. [2020-07-20 13:35:38,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 382 [2020-07-20 13:35:38,700 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:38,701 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 25, 25, 24, 20, 15, 15, 15, 15, 15, 15, 15, 12, 12, 12, 12, 12, 12, 12, 10, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:38,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:38,916 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:38,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:38,917 INFO L82 PathProgramCache]: Analyzing trace with hash 605039004, now seen corresponding path program 3 times [2020-07-20 13:35:38,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:38,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1368799072] [2020-07-20 13:35:38,918 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:39,209 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:39,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:39,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 695 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:35:39,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:39,416 INFO L134 CoverageAnalysis]: Checked inductivity of 4090 backedges. 290 proven. 753 refuted. 0 times theorem prover too weak. 3047 trivial. 0 not checked. [2020-07-20 13:35:39,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:41,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:41,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:42,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:42,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:42,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:42,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,588 INFO L134 CoverageAnalysis]: Checked inductivity of 4090 backedges. 292 proven. 784 refuted. 0 times theorem prover too weak. 3014 trivial. 0 not checked. [2020-07-20 13:35:43,589 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1368799072] [2020-07-20 13:35:43,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:43,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:35:43,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890708499] [2020-07-20 13:35:43,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:35:43,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:43,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:35:43,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:35:43,592 INFO L87 Difference]: Start difference. First operand 94 states and 160 transitions. Second operand 21 states. [2020-07-20 13:35:44,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:44,204 INFO L93 Difference]: Finished difference Result 191 states and 508 transitions. [2020-07-20 13:35:44,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:35:44,205 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 381 [2020-07-20 13:35:44,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:44,209 INFO L225 Difference]: With dead ends: 191 [2020-07-20 13:35:44,209 INFO L226 Difference]: Without dead ends: 105 [2020-07-20 13:35:44,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 769 GetRequests, 725 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:35:44,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-07-20 13:35:44,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 99. [2020-07-20 13:35:44,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-07-20 13:35:44,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 171 transitions. [2020-07-20 13:35:44,225 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 171 transitions. Word has length 381 [2020-07-20 13:35:44,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:44,226 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 171 transitions. [2020-07-20 13:35:44,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:35:44,226 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 171 transitions. [2020-07-20 13:35:44,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 437 [2020-07-20 13:35:44,230 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:44,231 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 29, 29, 27, 24, 17, 17, 17, 17, 17, 17, 17, 14, 14, 14, 14, 14, 14, 14, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:44,443 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:44,444 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:44,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:44,444 INFO L82 PathProgramCache]: Analyzing trace with hash 878417150, now seen corresponding path program 4 times [2020-07-20 13:35:44,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:44,445 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1954172959] [2020-07-20 13:35:44,445 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:44,773 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:44,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:44,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 790 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:35:44,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:44,997 INFO L134 CoverageAnalysis]: Checked inductivity of 5403 backedges. 196 proven. 740 refuted. 0 times theorem prover too weak. 4467 trivial. 0 not checked. [2020-07-20 13:35:44,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:46,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:46,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:46,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:47,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:47,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:47,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:47,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:47,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:47,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:47,545 INFO L134 CoverageAnalysis]: Checked inductivity of 5403 backedges. 196 proven. 756 refuted. 0 times theorem prover too weak. 4451 trivial. 0 not checked. [2020-07-20 13:35:47,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1954172959] [2020-07-20 13:35:47,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:47,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:35:47,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668789208] [2020-07-20 13:35:47,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:35:47,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:47,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:35:47,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:47,548 INFO L87 Difference]: Start difference. First operand 99 states and 171 transitions. Second operand 17 states. [2020-07-20 13:35:47,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:47,869 INFO L93 Difference]: Finished difference Result 178 states and 428 transitions. [2020-07-20 13:35:47,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:35:47,870 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 436 [2020-07-20 13:35:47,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:47,874 INFO L225 Difference]: With dead ends: 178 [2020-07-20 13:35:47,874 INFO L226 Difference]: Without dead ends: 163 [2020-07-20 13:35:47,876 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 877 GetRequests, 843 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:35:47,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-20 13:35:47,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 106. [2020-07-20 13:35:47,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-07-20 13:35:47,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 192 transitions. [2020-07-20 13:35:47,893 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 192 transitions. Word has length 436 [2020-07-20 13:35:47,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:47,894 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 192 transitions. [2020-07-20 13:35:47,894 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:35:47,894 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 192 transitions. [2020-07-20 13:35:47,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 433 [2020-07-20 13:35:47,898 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:47,898 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 30, 30, 25, 22, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 10, 8, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:48,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:48,112 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:48,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:48,113 INFO L82 PathProgramCache]: Analyzing trace with hash -421949250, now seen corresponding path program 5 times [2020-07-20 13:35:48,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:48,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1732076277] [2020-07-20 13:35:48,114 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:48,460 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:48,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:48,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 784 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:35:48,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:48,672 INFO L134 CoverageAnalysis]: Checked inductivity of 5283 backedges. 221 proven. 829 refuted. 0 times theorem prover too weak. 4233 trivial. 0 not checked. [2020-07-20 13:35:48,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:50,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:50,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:51,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:51,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:51,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:51,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:51,643 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:51,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:51,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:51,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:52,026 INFO L134 CoverageAnalysis]: Checked inductivity of 5283 backedges. 223 proven. 848 refuted. 0 times theorem prover too weak. 4212 trivial. 0 not checked. [2020-07-20 13:35:52,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1732076277] [2020-07-20 13:35:52,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:52,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:35:52,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317540917] [2020-07-20 13:35:52,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:35:52,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:52,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:35:52,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:35:52,029 INFO L87 Difference]: Start difference. First operand 106 states and 192 transitions. Second operand 19 states. [2020-07-20 13:35:52,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:52,443 INFO L93 Difference]: Finished difference Result 172 states and 408 transitions. [2020-07-20 13:35:52,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:35:52,447 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 432 [2020-07-20 13:35:52,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:52,452 INFO L225 Difference]: With dead ends: 172 [2020-07-20 13:35:52,452 INFO L226 Difference]: Without dead ends: 157 [2020-07-20 13:35:52,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 870 GetRequests, 831 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:35:52,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2020-07-20 13:35:52,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 109. [2020-07-20 13:35:52,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-07-20 13:35:52,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 192 transitions. [2020-07-20 13:35:52,477 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 192 transitions. Word has length 432 [2020-07-20 13:35:52,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:52,478 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 192 transitions. [2020-07-20 13:35:52,478 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:35:52,478 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 192 transitions. [2020-07-20 13:35:52,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 421 [2020-07-20 13:35:52,482 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:52,483 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 25, 22, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 10, 8, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:52,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:52,696 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:52,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:52,696 INFO L82 PathProgramCache]: Analyzing trace with hash 962719115, now seen corresponding path program 6 times [2020-07-20 13:35:52,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:52,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1677358732] [2020-07-20 13:35:52,697 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:53,075 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:53,076 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:53,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 761 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:35:53,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:53,265 INFO L134 CoverageAnalysis]: Checked inductivity of 4971 backedges. 231 proven. 642 refuted. 0 times theorem prover too weak. 4098 trivial. 0 not checked. [2020-07-20 13:35:53,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:54,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:55,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:55,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:55,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:55,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:55,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:55,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:55,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:55,938 INFO L134 CoverageAnalysis]: Checked inductivity of 4971 backedges. 231 proven. 656 refuted. 0 times theorem prover too weak. 4084 trivial. 0 not checked. [2020-07-20 13:35:55,939 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1677358732] [2020-07-20 13:35:55,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:55,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:35:55,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789259418] [2020-07-20 13:35:55,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:35:55,941 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:55,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:35:55,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:55,941 INFO L87 Difference]: Start difference. First operand 109 states and 192 transitions. Second operand 17 states. [2020-07-20 13:35:56,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:56,231 INFO L93 Difference]: Finished difference Result 190 states and 442 transitions. [2020-07-20 13:35:56,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:35:56,233 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 420 [2020-07-20 13:35:56,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:56,236 INFO L225 Difference]: With dead ends: 190 [2020-07-20 13:35:56,237 INFO L226 Difference]: Without dead ends: 178 [2020-07-20 13:35:56,239 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 845 GetRequests, 811 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:35:56,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-20 13:35:56,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 109. [2020-07-20 13:35:56,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-07-20 13:35:56,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 192 transitions. [2020-07-20 13:35:56,256 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 192 transitions. Word has length 420 [2020-07-20 13:35:56,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:56,257 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 192 transitions. [2020-07-20 13:35:56,257 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:35:56,257 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 192 transitions. [2020-07-20 13:35:56,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2020-07-20 13:35:56,261 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:56,262 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 30, 30, 28, 26, 18, 18, 18, 18, 18, 18, 18, 15, 15, 15, 15, 15, 15, 15, 13, 9, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:56,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:56,476 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:56,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:56,477 INFO L82 PathProgramCache]: Analyzing trace with hash -73058712, now seen corresponding path program 7 times [2020-07-20 13:35:56,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:56,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1131084027] [2020-07-20 13:35:56,478 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:56,870 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:56,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:56,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 840 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:35:56,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:57,123 INFO L134 CoverageAnalysis]: Checked inductivity of 6139 backedges. 454 proven. 845 refuted. 0 times theorem prover too weak. 4840 trivial. 0 not checked. [2020-07-20 13:35:57,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:59,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:00,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:00,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:00,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,808 INFO L134 CoverageAnalysis]: Checked inductivity of 6139 backedges. 456 proven. 876 refuted. 0 times theorem prover too weak. 4807 trivial. 0 not checked. [2020-07-20 13:36:01,809 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1131084027] [2020-07-20 13:36:01,809 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:01,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:36:01,810 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723762661] [2020-07-20 13:36:01,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:36:01,811 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:01,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:36:01,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:36:01,813 INFO L87 Difference]: Start difference. First operand 109 states and 192 transitions. Second operand 21 states. [2020-07-20 13:36:02,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:02,338 INFO L93 Difference]: Finished difference Result 145 states and 272 transitions. [2020-07-20 13:36:02,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:36:02,339 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 463 [2020-07-20 13:36:02,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:02,342 INFO L225 Difference]: With dead ends: 145 [2020-07-20 13:36:02,343 INFO L226 Difference]: Without dead ends: 117 [2020-07-20 13:36:02,345 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 933 GetRequests, 889 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:36:02,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-20 13:36:02,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2020-07-20 13:36:02,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-07-20 13:36:02,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 201 transitions. [2020-07-20 13:36:02,357 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 201 transitions. Word has length 463 [2020-07-20 13:36:02,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:02,357 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 201 transitions. [2020-07-20 13:36:02,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:36:02,358 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 201 transitions. [2020-07-20 13:36:02,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 573 [2020-07-20 13:36:02,364 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:02,364 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 38, 38, 35, 32, 22, 22, 22, 22, 22, 22, 22, 19, 19, 19, 19, 19, 19, 19, 16, 10, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:02,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:02,578 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:02,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:02,579 INFO L82 PathProgramCache]: Analyzing trace with hash 198773854, now seen corresponding path program 8 times [2020-07-20 13:36:02,579 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:02,579 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [112647600] [2020-07-20 13:36:02,580 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:03,019 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:03,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:03,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 1035 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:36:03,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:03,409 INFO L134 CoverageAnalysis]: Checked inductivity of 9471 backedges. 304 proven. 948 refuted. 0 times theorem prover too weak. 8219 trivial. 0 not checked. [2020-07-20 13:36:03,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:05,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:06,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:06,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:06,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:06,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:06,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:06,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:06,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:06,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:06,742 INFO L134 CoverageAnalysis]: Checked inductivity of 9471 backedges. 306 proven. 962 refuted. 0 times theorem prover too weak. 8203 trivial. 0 not checked. [2020-07-20 13:36:06,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [112647600] [2020-07-20 13:36:06,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:06,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:36:06,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256812001] [2020-07-20 13:36:06,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:36:06,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:06,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:36:06,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:36:06,744 INFO L87 Difference]: Start difference. First operand 117 states and 201 transitions. Second operand 17 states. [2020-07-20 13:36:07,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:07,076 INFO L93 Difference]: Finished difference Result 164 states and 328 transitions. [2020-07-20 13:36:07,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:36:07,077 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 572 [2020-07-20 13:36:07,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:07,081 INFO L225 Difference]: With dead ends: 164 [2020-07-20 13:36:07,081 INFO L226 Difference]: Without dead ends: 155 [2020-07-20 13:36:07,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1149 GetRequests, 1115 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:36:07,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-07-20 13:36:07,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 129. [2020-07-20 13:36:07,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-07-20 13:36:07,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 240 transitions. [2020-07-20 13:36:07,098 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 240 transitions. Word has length 572 [2020-07-20 13:36:07,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:07,098 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 240 transitions. [2020-07-20 13:36:07,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:36:07,098 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 240 transitions. [2020-07-20 13:36:07,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 498 [2020-07-20 13:36:07,103 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:07,104 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 34, 34, 26, 26, 19, 19, 19, 19, 19, 19, 19, 17, 17, 17, 17, 17, 17, 17, 13, 9, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:07,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:07,319 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:07,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:07,320 INFO L82 PathProgramCache]: Analyzing trace with hash 1718758431, now seen corresponding path program 9 times [2020-07-20 13:36:07,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:07,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2014551724] [2020-07-20 13:36:07,321 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:07,740 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:07,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:07,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 905 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:36:07,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:07,988 INFO L134 CoverageAnalysis]: Checked inductivity of 7086 backedges. 339 proven. 894 refuted. 0 times theorem prover too weak. 5853 trivial. 0 not checked. [2020-07-20 13:36:07,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:10,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:10,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:10,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:10,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:11,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:11,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:11,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:11,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:11,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:11,788 INFO L134 CoverageAnalysis]: Checked inductivity of 7086 backedges. 341 proven. 913 refuted. 0 times theorem prover too weak. 5832 trivial. 0 not checked. [2020-07-20 13:36:11,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2014551724] [2020-07-20 13:36:11,789 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:11,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:36:11,789 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687885564] [2020-07-20 13:36:11,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:36:11,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:11,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:36:11,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:36:11,790 INFO L87 Difference]: Start difference. First operand 129 states and 240 transitions. Second operand 19 states. [2020-07-20 13:36:12,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:12,161 INFO L93 Difference]: Finished difference Result 172 states and 344 transitions. [2020-07-20 13:36:12,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:36:12,162 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 497 [2020-07-20 13:36:12,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:12,165 INFO L225 Difference]: With dead ends: 172 [2020-07-20 13:36:12,165 INFO L226 Difference]: Without dead ends: 163 [2020-07-20 13:36:12,167 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1000 GetRequests, 961 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:36:12,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-20 13:36:12,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 125. [2020-07-20 13:36:12,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-07-20 13:36:12,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 225 transitions. [2020-07-20 13:36:12,181 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 225 transitions. Word has length 497 [2020-07-20 13:36:12,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:12,181 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 225 transitions. [2020-07-20 13:36:12,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:36:12,181 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 225 transitions. [2020-07-20 13:36:12,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 394 [2020-07-20 13:36:12,185 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:12,186 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 23, 21, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 9, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:12,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:12,400 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:12,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:12,401 INFO L82 PathProgramCache]: Analyzing trace with hash 439841979, now seen corresponding path program 10 times [2020-07-20 13:36:12,401 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:12,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [264502457] [2020-07-20 13:36:12,402 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:12,806 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:12,806 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:12,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:36:12,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:12,953 INFO L134 CoverageAnalysis]: Checked inductivity of 4327 backedges. 269 proven. 538 refuted. 0 times theorem prover too weak. 3520 trivial. 0 not checked. [2020-07-20 13:36:12,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:14,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:14,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:14,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:14,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:15,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:15,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:15,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:15,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:15,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:15,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:15,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:15,496 INFO L134 CoverageAnalysis]: Checked inductivity of 4327 backedges. 269 proven. 554 refuted. 0 times theorem prover too weak. 3504 trivial. 0 not checked. [2020-07-20 13:36:15,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [264502457] [2020-07-20 13:36:15,496 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:15,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:36:15,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688217800] [2020-07-20 13:36:15,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:36:15,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:15,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:36:15,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:36:15,498 INFO L87 Difference]: Start difference. First operand 125 states and 225 transitions. Second operand 17 states. [2020-07-20 13:36:15,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:15,776 INFO L93 Difference]: Finished difference Result 184 states and 375 transitions. [2020-07-20 13:36:15,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:36:15,777 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 393 [2020-07-20 13:36:15,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:15,780 INFO L225 Difference]: With dead ends: 184 [2020-07-20 13:36:15,780 INFO L226 Difference]: Without dead ends: 175 [2020-07-20 13:36:15,782 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 791 GetRequests, 757 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:36:15,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2020-07-20 13:36:15,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 122. [2020-07-20 13:36:15,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2020-07-20 13:36:15,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 215 transitions. [2020-07-20 13:36:15,796 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 215 transitions. Word has length 393 [2020-07-20 13:36:15,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:15,797 INFO L479 AbstractCegarLoop]: Abstraction has 122 states and 215 transitions. [2020-07-20 13:36:15,797 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:36:15,797 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 215 transitions. [2020-07-20 13:36:15,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 395 [2020-07-20 13:36:15,801 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:15,801 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 23, 22, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 9, 8, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:16,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:16,015 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:16,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:16,016 INFO L82 PathProgramCache]: Analyzing trace with hash 14714015, now seen corresponding path program 11 times [2020-07-20 13:36:16,016 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:16,016 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [890325583] [2020-07-20 13:36:16,017 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:16,425 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:16,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:16,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:36:16,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:16,547 INFO L134 CoverageAnalysis]: Checked inductivity of 4348 backedges. 248 proven. 448 refuted. 0 times theorem prover too weak. 3652 trivial. 0 not checked. [2020-07-20 13:36:16,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:17,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:17,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:18,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:18,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:18,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:18,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:18,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:18,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:18,629 INFO L134 CoverageAnalysis]: Checked inductivity of 4348 backedges. 248 proven. 458 refuted. 0 times theorem prover too weak. 3642 trivial. 0 not checked. [2020-07-20 13:36:18,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [890325583] [2020-07-20 13:36:18,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:18,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:36:18,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044514763] [2020-07-20 13:36:18,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:36:18,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:18,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:36:18,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:36:18,631 INFO L87 Difference]: Start difference. First operand 122 states and 215 transitions. Second operand 15 states. [2020-07-20 13:36:18,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:18,872 INFO L93 Difference]: Finished difference Result 212 states and 505 transitions. [2020-07-20 13:36:18,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:36:18,873 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 394 [2020-07-20 13:36:18,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:18,876 INFO L225 Difference]: With dead ends: 212 [2020-07-20 13:36:18,877 INFO L226 Difference]: Without dead ends: 203 [2020-07-20 13:36:18,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 792 GetRequests, 763 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:36:18,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2020-07-20 13:36:18,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 124. [2020-07-20 13:36:18,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-20 13:36:18,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 224 transitions. [2020-07-20 13:36:18,898 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 224 transitions. Word has length 394 [2020-07-20 13:36:18,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:18,898 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 224 transitions. [2020-07-20 13:36:18,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:36:18,898 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 224 transitions. [2020-07-20 13:36:18,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 475 [2020-07-20 13:36:18,903 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:18,903 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 27, 26, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 10, 9, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:19,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:19,117 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:19,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:19,117 INFO L82 PathProgramCache]: Analyzing trace with hash -290324045, now seen corresponding path program 12 times [2020-07-20 13:36:19,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:19,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [292732839] [2020-07-20 13:36:19,118 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:19,539 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:19,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:19,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 862 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:36:19,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:19,860 INFO L134 CoverageAnalysis]: Checked inductivity of 6388 backedges. 642 proven. 697 refuted. 0 times theorem prover too weak. 5049 trivial. 0 not checked. [2020-07-20 13:36:19,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:22,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:22,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:23,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:23,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:23,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:23,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:23,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:23,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:23,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:23,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:23,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:24,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:24,489 INFO L134 CoverageAnalysis]: Checked inductivity of 6388 backedges. 642 proven. 730 refuted. 0 times theorem prover too weak. 5016 trivial. 0 not checked. [2020-07-20 13:36:24,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [292732839] [2020-07-20 13:36:24,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:24,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 13:36:24,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822949031] [2020-07-20 13:36:24,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:36:24,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:24,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:36:24,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:36:24,491 INFO L87 Difference]: Start difference. First operand 124 states and 224 transitions. Second operand 21 states. [2020-07-20 13:36:24,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:24,997 INFO L93 Difference]: Finished difference Result 158 states and 288 transitions. [2020-07-20 13:36:24,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:36:24,998 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 474 [2020-07-20 13:36:24,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:25,002 INFO L225 Difference]: With dead ends: 158 [2020-07-20 13:36:25,002 INFO L226 Difference]: Without dead ends: 140 [2020-07-20 13:36:25,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 955 GetRequests, 911 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:36:25,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-07-20 13:36:25,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 132. [2020-07-20 13:36:25,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2020-07-20 13:36:25,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 234 transitions. [2020-07-20 13:36:25,018 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 234 transitions. Word has length 474 [2020-07-20 13:36:25,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:25,018 INFO L479 AbstractCegarLoop]: Abstraction has 132 states and 234 transitions. [2020-07-20 13:36:25,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:36:25,018 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 234 transitions. [2020-07-20 13:36:25,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-07-20 13:36:25,023 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:25,023 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 24, 22, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 9, 8, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:25,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:25,238 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:25,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:25,239 INFO L82 PathProgramCache]: Analyzing trace with hash 1063001062, now seen corresponding path program 13 times [2020-07-20 13:36:25,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:25,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1536662674] [2020-07-20 13:36:25,240 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:25,673 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:25,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:25,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 739 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:36:25,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:25,856 INFO L134 CoverageAnalysis]: Checked inductivity of 4655 backedges. 289 proven. 555 refuted. 0 times theorem prover too weak. 3811 trivial. 0 not checked. [2020-07-20 13:36:25,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:27,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:27,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:28,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:28,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:28,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:28,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:28,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:28,513 INFO L134 CoverageAnalysis]: Checked inductivity of 4655 backedges. 291 proven. 567 refuted. 0 times theorem prover too weak. 3797 trivial. 0 not checked. [2020-07-20 13:36:28,513 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1536662674] [2020-07-20 13:36:28,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:28,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:36:28,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985684958] [2020-07-20 13:36:28,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:36:28,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:28,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:36:28,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:36:28,514 INFO L87 Difference]: Start difference. First operand 132 states and 234 transitions. Second operand 17 states. [2020-07-20 13:36:28,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:28,832 INFO L93 Difference]: Finished difference Result 173 states and 322 transitions. [2020-07-20 13:36:28,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:36:28,833 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 407 [2020-07-20 13:36:28,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:28,835 INFO L225 Difference]: With dead ends: 173 [2020-07-20 13:36:28,835 INFO L226 Difference]: Without dead ends: 164 [2020-07-20 13:36:28,838 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 819 GetRequests, 785 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:36:28,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2020-07-20 13:36:28,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 130. [2020-07-20 13:36:28,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-07-20 13:36:28,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 225 transitions. [2020-07-20 13:36:28,852 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 225 transitions. Word has length 407 [2020-07-20 13:36:28,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:28,853 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 225 transitions. [2020-07-20 13:36:28,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:36:28,853 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 225 transitions. [2020-07-20 13:36:28,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 434 [2020-07-20 13:36:28,859 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:28,860 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 24, 24, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 9, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:29,074 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:29,075 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:29,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:29,076 INFO L82 PathProgramCache]: Analyzing trace with hash -1145336142, now seen corresponding path program 14 times [2020-07-20 13:36:29,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:29,076 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [147129824] [2020-07-20 13:36:29,077 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:29,620 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:29,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:29,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 789 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:36:29,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:29,822 INFO L134 CoverageAnalysis]: Checked inductivity of 5296 backedges. 399 proven. 665 refuted. 0 times theorem prover too weak. 4232 trivial. 0 not checked. [2020-07-20 13:36:29,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:31,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:32,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:32,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:32,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:32,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:32,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:33,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:33,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:33,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:33,401 INFO L134 CoverageAnalysis]: Checked inductivity of 5296 backedges. 403 proven. 685 refuted. 0 times theorem prover too weak. 4208 trivial. 0 not checked. [2020-07-20 13:36:33,402 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [147129824] [2020-07-20 13:36:33,402 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:33,402 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:36:33,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994813882] [2020-07-20 13:36:33,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:36:33,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:33,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:36:33,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:36:33,403 INFO L87 Difference]: Start difference. First operand 130 states and 225 transitions. Second operand 19 states. [2020-07-20 13:36:33,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:33,819 INFO L93 Difference]: Finished difference Result 187 states and 350 transitions. [2020-07-20 13:36:33,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:36:33,821 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 433 [2020-07-20 13:36:33,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:33,822 INFO L225 Difference]: With dead ends: 187 [2020-07-20 13:36:33,823 INFO L226 Difference]: Without dead ends: 156 [2020-07-20 13:36:33,824 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 872 GetRequests, 833 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:36:33,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2020-07-20 13:36:33,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 147. [2020-07-20 13:36:33,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-07-20 13:36:33,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 268 transitions. [2020-07-20 13:36:33,837 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 268 transitions. Word has length 433 [2020-07-20 13:36:33,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:33,838 INFO L479 AbstractCegarLoop]: Abstraction has 147 states and 268 transitions. [2020-07-20 13:36:33,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:36:33,838 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 268 transitions. [2020-07-20 13:36:33,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 368 [2020-07-20 13:36:33,842 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:33,843 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 21, 21, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 8, 8, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:34,055 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:34,056 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:34,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:34,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1789968983, now seen corresponding path program 15 times [2020-07-20 13:36:34,057 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:34,058 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [990972938] [2020-07-20 13:36:34,058 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:34,530 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:36:34,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:34,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 817 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:36:34,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:34,785 INFO L134 CoverageAnalysis]: Checked inductivity of 3748 backedges. 394 proven. 369 refuted. 0 times theorem prover too weak. 2985 trivial. 0 not checked. [2020-07-20 13:36:34,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:36,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:36,697 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:36,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:36,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:36,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:37,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:37,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:37,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:37,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:37,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:37,567 INFO L134 CoverageAnalysis]: Checked inductivity of 3748 backedges. 396 proven. 383 refuted. 0 times theorem prover too weak. 2969 trivial. 0 not checked. [2020-07-20 13:36:37,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [990972938] [2020-07-20 13:36:37,568 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:37,568 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:36:37,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675618459] [2020-07-20 13:36:37,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:36:37,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:37,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:36:37,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:36:37,569 INFO L87 Difference]: Start difference. First operand 147 states and 268 transitions. Second operand 17 states. [2020-07-20 13:36:37,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:37,919 INFO L93 Difference]: Finished difference Result 213 states and 459 transitions. [2020-07-20 13:36:37,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:36:37,921 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 367 [2020-07-20 13:36:37,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:37,924 INFO L225 Difference]: With dead ends: 213 [2020-07-20 13:36:37,924 INFO L226 Difference]: Without dead ends: 204 [2020-07-20 13:36:37,928 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 739 GetRequests, 705 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:36:37,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2020-07-20 13:36:37,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 173. [2020-07-20 13:36:37,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 13:36:37,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 352 transitions. [2020-07-20 13:36:37,949 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 352 transitions. Word has length 367 [2020-07-20 13:36:37,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:37,950 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 352 transitions. [2020-07-20 13:36:37,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:36:37,950 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 352 transitions. [2020-07-20 13:36:37,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 405 [2020-07-20 13:36:37,956 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:37,956 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 28, 28, 22, 21, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 10, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:38,169 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:38,170 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:38,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:38,170 INFO L82 PathProgramCache]: Analyzing trace with hash -329415166, now seen corresponding path program 16 times [2020-07-20 13:36:38,170 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:38,170 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [725780238] [2020-07-20 13:36:38,171 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:38,641 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:38,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:38,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 733 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 13:36:38,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:38,863 INFO L134 CoverageAnalysis]: Checked inductivity of 4597 backedges. 359 proven. 539 refuted. 0 times theorem prover too weak. 3699 trivial. 0 not checked. [2020-07-20 13:36:38,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:40,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:41,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:41,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:41,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:41,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:41,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:41,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:41,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:41,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:42,019 INFO L134 CoverageAnalysis]: Checked inductivity of 4597 backedges. 361 proven. 551 refuted. 0 times theorem prover too weak. 3685 trivial. 0 not checked. [2020-07-20 13:36:42,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [725780238] [2020-07-20 13:36:42,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:42,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-20 13:36:42,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257182683] [2020-07-20 13:36:42,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:36:42,021 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:42,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:36:42,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:36:42,021 INFO L87 Difference]: Start difference. First operand 173 states and 352 transitions. Second operand 19 states. [2020-07-20 13:36:42,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:42,401 INFO L93 Difference]: Finished difference Result 231 states and 479 transitions. [2020-07-20 13:36:42,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:36:42,402 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 404 [2020-07-20 13:36:42,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:42,405 INFO L225 Difference]: With dead ends: 231 [2020-07-20 13:36:42,405 INFO L226 Difference]: Without dead ends: 197 [2020-07-20 13:36:42,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 813 GetRequests, 777 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:36:42,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2020-07-20 13:36:42,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 162. [2020-07-20 13:36:42,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-07-20 13:36:42,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 310 transitions. [2020-07-20 13:36:42,423 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 310 transitions. Word has length 404 [2020-07-20 13:36:42,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:42,424 INFO L479 AbstractCegarLoop]: Abstraction has 162 states and 310 transitions. [2020-07-20 13:36:42,424 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:36:42,424 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 310 transitions. [2020-07-20 13:36:42,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 393 [2020-07-20 13:36:42,429 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:42,430 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 26, 26, 22, 21, 15, 15, 15, 15, 15, 15, 15, 13, 13, 13, 13, 13, 13, 13, 9, 9, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:42,644 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:42,645 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:42,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:42,645 INFO L82 PathProgramCache]: Analyzing trace with hash 1862278423, now seen corresponding path program 17 times [2020-07-20 13:36:42,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:42,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [516313960] [2020-07-20 13:36:42,646 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:43,177 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:36:43,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:43,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:36:43,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:43,354 INFO L134 CoverageAnalysis]: Checked inductivity of 4333 backedges. 472 proven. 470 refuted. 0 times theorem prover too weak. 3391 trivial. 0 not checked. [2020-07-20 13:36:43,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:45,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:45,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:45,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:45,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:45,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:45,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:46,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:46,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:46,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:46,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:46,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:46,913 INFO L134 CoverageAnalysis]: Checked inductivity of 4333 backedges. 476 proven. 487 refuted. 0 times theorem prover too weak. 3370 trivial. 0 not checked. [2020-07-20 13:36:46,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [516313960] [2020-07-20 13:36:46,914 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:46,914 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:36:46,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355071394] [2020-07-20 13:36:46,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:36:46,914 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:46,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:36:46,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:36:46,915 INFO L87 Difference]: Start difference. First operand 162 states and 310 transitions. Second operand 19 states. [2020-07-20 13:36:47,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:47,327 INFO L93 Difference]: Finished difference Result 221 states and 458 transitions. [2020-07-20 13:36:47,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:36:47,328 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 392 [2020-07-20 13:36:47,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:47,332 INFO L225 Difference]: With dead ends: 221 [2020-07-20 13:36:47,332 INFO L226 Difference]: Without dead ends: 212 [2020-07-20 13:36:47,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 790 GetRequests, 751 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:36:47,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2020-07-20 13:36:47,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 162. [2020-07-20 13:36:47,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-07-20 13:36:47,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 310 transitions. [2020-07-20 13:36:47,351 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 310 transitions. Word has length 392 [2020-07-20 13:36:47,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:47,351 INFO L479 AbstractCegarLoop]: Abstraction has 162 states and 310 transitions. [2020-07-20 13:36:47,352 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:36:47,352 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 310 transitions. [2020-07-20 13:36:47,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 517 [2020-07-20 13:36:47,357 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:47,357 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 34, 34, 31, 28, 20, 20, 20, 20, 20, 20, 20, 17, 17, 17, 17, 17, 17, 17, 14, 10, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:47,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:47,572 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:47,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:47,573 INFO L82 PathProgramCache]: Analyzing trace with hash -1873339426, now seen corresponding path program 18 times [2020-07-20 13:36:47,573 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:47,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1250725680] [2020-07-20 13:36:47,574 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:48,098 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:48,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:48,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 934 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:36:48,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:48,268 INFO L134 CoverageAnalysis]: Checked inductivity of 7671 backedges. 424 proven. 669 refuted. 0 times theorem prover too weak. 6578 trivial. 0 not checked. [2020-07-20 13:36:48,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:50,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:50,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:50,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:51,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:51,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:51,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:51,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:51,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:51,743 INFO L134 CoverageAnalysis]: Checked inductivity of 7671 backedges. 426 proven. 681 refuted. 0 times theorem prover too weak. 6564 trivial. 0 not checked. [2020-07-20 13:36:51,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1250725680] [2020-07-20 13:36:51,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:51,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:36:51,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766475759] [2020-07-20 13:36:51,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:36:51,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:51,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:36:51,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:36:51,745 INFO L87 Difference]: Start difference. First operand 162 states and 310 transitions. Second operand 17 states. [2020-07-20 13:36:52,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:52,039 INFO L93 Difference]: Finished difference Result 251 states and 555 transitions. [2020-07-20 13:36:52,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:36:52,040 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 516 [2020-07-20 13:36:52,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:52,044 INFO L225 Difference]: With dead ends: 251 [2020-07-20 13:36:52,044 INFO L226 Difference]: Without dead ends: 242 [2020-07-20 13:36:52,046 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1037 GetRequests, 1003 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:36:52,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2020-07-20 13:36:52,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 157. [2020-07-20 13:36:52,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-20 13:36:52,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 291 transitions. [2020-07-20 13:36:52,064 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 291 transitions. Word has length 516 [2020-07-20 13:36:52,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:52,065 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 291 transitions. [2020-07-20 13:36:52,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:36:52,065 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 291 transitions. [2020-07-20 13:36:52,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 452 [2020-07-20 13:36:52,069 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:52,070 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 27, 27, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 11, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:52,283 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:52,284 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:52,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:52,284 INFO L82 PathProgramCache]: Analyzing trace with hash 232198335, now seen corresponding path program 19 times [2020-07-20 13:36:52,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:52,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1587271118] [2020-07-20 13:36:52,284 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:52,833 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:36:52,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:52,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 1003 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:36:52,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:52,979 INFO L134 CoverageAnalysis]: Checked inductivity of 5758 backedges. 380 proven. 428 refuted. 0 times theorem prover too weak. 4950 trivial. 0 not checked. [2020-07-20 13:36:52,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:54,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:54,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:54,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:54,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:54,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:54,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:54,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:54,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:55,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:55,536 INFO L134 CoverageAnalysis]: Checked inductivity of 5758 backedges. 380 proven. 440 refuted. 0 times theorem prover too weak. 4938 trivial. 0 not checked. [2020-07-20 13:36:55,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1587271118] [2020-07-20 13:36:55,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:55,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:36:55,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679233935] [2020-07-20 13:36:55,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:36:55,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:55,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:36:55,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:36:55,538 INFO L87 Difference]: Start difference. First operand 157 states and 291 transitions. Second operand 15 states. [2020-07-20 13:36:55,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:55,803 INFO L93 Difference]: Finished difference Result 288 states and 702 transitions. [2020-07-20 13:36:55,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:36:55,804 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 451 [2020-07-20 13:36:55,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:55,809 INFO L225 Difference]: With dead ends: 288 [2020-07-20 13:36:55,809 INFO L226 Difference]: Without dead ends: 279 [2020-07-20 13:36:55,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 877 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:36:55,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2020-07-20 13:36:55,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 159. [2020-07-20 13:36:55,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2020-07-20 13:36:55,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 300 transitions. [2020-07-20 13:36:55,834 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 300 transitions. Word has length 451 [2020-07-20 13:36:55,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:55,834 INFO L479 AbstractCegarLoop]: Abstraction has 159 states and 300 transitions. [2020-07-20 13:36:55,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:36:55,835 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 300 transitions. [2020-07-20 13:36:55,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 436 [2020-07-20 13:36:55,839 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:55,839 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 30, 30, 25, 25, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 10, 9, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:56,053 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:56,054 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:56,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:56,054 INFO L82 PathProgramCache]: Analyzing trace with hash 1719765690, now seen corresponding path program 20 times [2020-07-20 13:36:56,054 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:56,055 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1531022241] [2020-07-20 13:36:56,055 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:56,587 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:36:56,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:56,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 968 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:36:56,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:56,751 INFO L134 CoverageAnalysis]: Checked inductivity of 5352 backedges. 565 proven. 510 refuted. 0 times theorem prover too weak. 4277 trivial. 0 not checked. [2020-07-20 13:36:56,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:58,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:59,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:59,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:59,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:59,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:59,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:59,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:00,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:00,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:00,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:00,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:00,654 INFO L134 CoverageAnalysis]: Checked inductivity of 5352 backedges. 565 proven. 536 refuted. 0 times theorem prover too weak. 4251 trivial. 0 not checked. [2020-07-20 13:37:00,654 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1531022241] [2020-07-20 13:37:00,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:00,655 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:37:00,655 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132090592] [2020-07-20 13:37:00,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:37:00,655 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:00,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:37:00,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:37:00,656 INFO L87 Difference]: Start difference. First operand 159 states and 300 transitions. Second operand 19 states. [2020-07-20 13:37:01,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:01,133 INFO L93 Difference]: Finished difference Result 243 states and 522 transitions. [2020-07-20 13:37:01,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:37:01,134 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 435 [2020-07-20 13:37:01,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:01,137 INFO L225 Difference]: With dead ends: 243 [2020-07-20 13:37:01,137 INFO L226 Difference]: Without dead ends: 225 [2020-07-20 13:37:01,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 876 GetRequests, 837 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:37:01,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-20 13:37:01,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 170. [2020-07-20 13:37:01,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2020-07-20 13:37:01,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 340 transitions. [2020-07-20 13:37:01,163 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 340 transitions. Word has length 435 [2020-07-20 13:37:01,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:01,163 INFO L479 AbstractCegarLoop]: Abstraction has 170 states and 340 transitions. [2020-07-20 13:37:01,163 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:37:01,163 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 340 transitions. [2020-07-20 13:37:01,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 571 [2020-07-20 13:37:01,169 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:01,169 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 41, 41, 34, 31, 21, 21, 21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 20, 20, 14, 10, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:01,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:01,377 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:01,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:01,378 INFO L82 PathProgramCache]: Analyzing trace with hash -808059492, now seen corresponding path program 21 times [2020-07-20 13:37:01,378 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:01,378 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1372429669] [2020-07-20 13:37:01,379 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:01,974 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:37:01,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:01,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 1268 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:37:01,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:02,208 INFO L134 CoverageAnalysis]: Checked inductivity of 9350 backedges. 416 proven. 596 refuted. 0 times theorem prover too weak. 8338 trivial. 0 not checked. [2020-07-20 13:37:02,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:04,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:04,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:04,394 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:04,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:04,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:04,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:04,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:04,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:04,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:04,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:05,396 INFO L134 CoverageAnalysis]: Checked inductivity of 9350 backedges. 416 proven. 606 refuted. 0 times theorem prover too weak. 8328 trivial. 0 not checked. [2020-07-20 13:37:05,397 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1372429669] [2020-07-20 13:37:05,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:05,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:37:05,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425824051] [2020-07-20 13:37:05,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:37:05,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:05,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:37:05,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:37:05,398 INFO L87 Difference]: Start difference. First operand 170 states and 340 transitions. Second operand 15 states. [2020-07-20 13:37:05,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:05,699 INFO L93 Difference]: Finished difference Result 257 states and 585 transitions. [2020-07-20 13:37:05,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:37:05,700 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 570 [2020-07-20 13:37:05,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:05,704 INFO L225 Difference]: With dead ends: 257 [2020-07-20 13:37:05,705 INFO L226 Difference]: Without dead ends: 248 [2020-07-20 13:37:05,707 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1144 GetRequests, 1115 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:37:05,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2020-07-20 13:37:05,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 176. [2020-07-20 13:37:05,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 13:37:05,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 363 transitions. [2020-07-20 13:37:05,727 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 363 transitions. Word has length 570 [2020-07-20 13:37:05,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:05,728 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 363 transitions. [2020-07-20 13:37:05,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:37:05,728 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 363 transitions. [2020-07-20 13:37:05,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 398 [2020-07-20 13:37:05,733 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:05,733 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 24, 24, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 10, 10, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:05,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:05,947 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:05,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:05,948 INFO L82 PathProgramCache]: Analyzing trace with hash 1376344843, now seen corresponding path program 22 times [2020-07-20 13:37:05,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:05,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [921768646] [2020-07-20 13:37:05,948 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:06,594 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:37:06,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:06,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 883 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:37:06,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:06,753 INFO L134 CoverageAnalysis]: Checked inductivity of 4416 backedges. 458 proven. 377 refuted. 0 times theorem prover too weak. 3581 trivial. 0 not checked. [2020-07-20 13:37:06,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:08,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:08,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:08,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:09,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:09,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:09,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:09,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:09,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:09,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:09,693 INFO L134 CoverageAnalysis]: Checked inductivity of 4416 backedges. 462 proven. 391 refuted. 0 times theorem prover too weak. 3563 trivial. 0 not checked. [2020-07-20 13:37:09,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [921768646] [2020-07-20 13:37:09,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:09,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:37:09,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248478476] [2020-07-20 13:37:09,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:37:09,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:09,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:37:09,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:37:09,695 INFO L87 Difference]: Start difference. First operand 176 states and 363 transitions. Second operand 17 states. [2020-07-20 13:37:10,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:10,097 INFO L93 Difference]: Finished difference Result 258 states and 581 transitions. [2020-07-20 13:37:10,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:37:10,098 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 397 [2020-07-20 13:37:10,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:10,101 INFO L225 Difference]: With dead ends: 258 [2020-07-20 13:37:10,101 INFO L226 Difference]: Without dead ends: 240 [2020-07-20 13:37:10,103 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 799 GetRequests, 765 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:37:10,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2020-07-20 13:37:10,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 173. [2020-07-20 13:37:10,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 13:37:10,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 353 transitions. [2020-07-20 13:37:10,120 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 353 transitions. Word has length 397 [2020-07-20 13:37:10,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:10,121 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 353 transitions. [2020-07-20 13:37:10,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:37:10,121 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 353 transitions. [2020-07-20 13:37:10,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 409 [2020-07-20 13:37:10,125 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:10,126 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 24, 23, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 10, 8, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:10,340 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:10,341 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:10,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:10,342 INFO L82 PathProgramCache]: Analyzing trace with hash -1842385432, now seen corresponding path program 23 times [2020-07-20 13:37:10,342 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:10,342 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1707753323] [2020-07-20 13:37:10,343 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:10,901 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:37:10,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:10,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 908 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:37:10,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:11,035 INFO L134 CoverageAnalysis]: Checked inductivity of 4677 backedges. 396 proven. 324 refuted. 0 times theorem prover too weak. 3957 trivial. 0 not checked. [2020-07-20 13:37:11,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:12,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:12,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:12,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:12,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:12,697 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:12,697 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:12,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:12,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:12,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:13,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:13,475 INFO L134 CoverageAnalysis]: Checked inductivity of 4677 backedges. 398 proven. 332 refuted. 0 times theorem prover too weak. 3947 trivial. 0 not checked. [2020-07-20 13:37:13,476 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1707753323] [2020-07-20 13:37:13,476 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:13,476 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:37:13,476 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406170968] [2020-07-20 13:37:13,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:37:13,477 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:13,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:37:13,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:37:13,477 INFO L87 Difference]: Start difference. First operand 173 states and 353 transitions. Second operand 15 states. [2020-07-20 13:37:13,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:13,790 INFO L93 Difference]: Finished difference Result 268 states and 637 transitions. [2020-07-20 13:37:13,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:37:13,791 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 408 [2020-07-20 13:37:13,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:13,795 INFO L225 Difference]: With dead ends: 268 [2020-07-20 13:37:13,795 INFO L226 Difference]: Without dead ends: 259 [2020-07-20 13:37:13,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 820 GetRequests, 791 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:37:13,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2020-07-20 13:37:13,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 175. [2020-07-20 13:37:13,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2020-07-20 13:37:13,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 363 transitions. [2020-07-20 13:37:13,813 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 363 transitions. Word has length 408 [2020-07-20 13:37:13,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:13,813 INFO L479 AbstractCegarLoop]: Abstraction has 175 states and 363 transitions. [2020-07-20 13:37:13,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:37:13,814 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 363 transitions. [2020-07-20 13:37:13,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2020-07-20 13:37:13,818 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:13,819 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 23, 23, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 9, 9, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:14,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:14,033 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:14,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:14,034 INFO L82 PathProgramCache]: Analyzing trace with hash 634662915, now seen corresponding path program 24 times [2020-07-20 13:37:14,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:14,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1777305057] [2020-07-20 13:37:14,035 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:14,645 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:37:14,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:14,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 879 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:37:14,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:14,823 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 655 proven. 176 refuted. 0 times theorem prover too weak. 3539 trivial. 0 not checked. [2020-07-20 13:37:14,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:16,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:16,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:16,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:16,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:16,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:16,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:16,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:16,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:16,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:17,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:17,843 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 659 proven. 188 refuted. 0 times theorem prover too weak. 3523 trivial. 0 not checked. [2020-07-20 13:37:17,843 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1777305057] [2020-07-20 13:37:17,843 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:17,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:37:17,844 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488842268] [2020-07-20 13:37:17,844 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:37:17,844 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:17,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:37:17,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:37:17,845 INFO L87 Difference]: Start difference. First operand 175 states and 363 transitions. Second operand 17 states. [2020-07-20 13:37:18,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:18,211 INFO L93 Difference]: Finished difference Result 250 states and 590 transitions. [2020-07-20 13:37:18,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:37:18,213 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 395 [2020-07-20 13:37:18,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:18,217 INFO L225 Difference]: With dead ends: 250 [2020-07-20 13:37:18,217 INFO L226 Difference]: Without dead ends: 235 [2020-07-20 13:37:18,219 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 795 GetRequests, 761 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:37:18,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2020-07-20 13:37:18,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 204. [2020-07-20 13:37:18,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-20 13:37:18,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 446 transitions. [2020-07-20 13:37:18,239 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 446 transitions. Word has length 395 [2020-07-20 13:37:18,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:18,240 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 446 transitions. [2020-07-20 13:37:18,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:37:18,240 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 446 transitions. [2020-07-20 13:37:18,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 597 [2020-07-20 13:37:18,248 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:18,249 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 42, 42, 34, 33, 22, 22, 22, 22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 21, 12, 12, 12, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:18,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:18,464 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:18,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:18,464 INFO L82 PathProgramCache]: Analyzing trace with hash 1556590974, now seen corresponding path program 25 times [2020-07-20 13:37:18,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:18,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1544622260] [2020-07-20 13:37:18,465 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:19,129 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:37:19,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:19,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 1080 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 13:37:19,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:19,362 INFO L134 CoverageAnalysis]: Checked inductivity of 10257 backedges. 544 proven. 844 refuted. 0 times theorem prover too weak. 8869 trivial. 0 not checked. [2020-07-20 13:37:19,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:22,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:22,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:22,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:22,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:23,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:23,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:23,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:23,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:23,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:23,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:23,992 INFO L134 CoverageAnalysis]: Checked inductivity of 10257 backedges. 542 proven. 862 refuted. 0 times theorem prover too weak. 8853 trivial. 0 not checked. [2020-07-20 13:37:23,992 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1544622260] [2020-07-20 13:37:23,992 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:23,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-20 13:37:23,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291980388] [2020-07-20 13:37:23,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:37:23,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:23,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:37:23,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:37:23,994 INFO L87 Difference]: Start difference. First operand 204 states and 446 transitions. Second operand 19 states. [2020-07-20 13:37:24,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:24,471 INFO L93 Difference]: Finished difference Result 275 states and 668 transitions. [2020-07-20 13:37:24,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:37:24,473 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 596 [2020-07-20 13:37:24,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:24,477 INFO L225 Difference]: With dead ends: 275 [2020-07-20 13:37:24,477 INFO L226 Difference]: Without dead ends: 257 [2020-07-20 13:37:24,480 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1197 GetRequests, 1161 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:37:24,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-20 13:37:24,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 184. [2020-07-20 13:37:24,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-07-20 13:37:24,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 398 transitions. [2020-07-20 13:37:24,502 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 398 transitions. Word has length 596 [2020-07-20 13:37:24,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:24,502 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 398 transitions. [2020-07-20 13:37:24,502 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:37:24,502 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 398 transitions. [2020-07-20 13:37:24,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 569 [2020-07-20 13:37:24,507 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:24,507 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 41, 41, 33, 30, 21, 21, 21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 20, 20, 12, 12, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:24,707 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:24,708 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:24,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:24,709 INFO L82 PathProgramCache]: Analyzing trace with hash 756778718, now seen corresponding path program 26 times [2020-07-20 13:37:24,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:24,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1782043706] [2020-07-20 13:37:24,710 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:25,324 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:37:25,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:25,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 1029 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:37:25,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:25,526 INFO L134 CoverageAnalysis]: Checked inductivity of 9287 backedges. 462 proven. 759 refuted. 0 times theorem prover too weak. 8066 trivial. 0 not checked. [2020-07-20 13:37:25,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:28,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:28,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:28,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:28,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:28,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:28,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:29,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:29,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:29,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:29,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:29,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:29,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:29,851 INFO L134 CoverageAnalysis]: Checked inductivity of 9287 backedges. 462 proven. 775 refuted. 0 times theorem prover too weak. 8050 trivial. 0 not checked. [2020-07-20 13:37:29,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1782043706] [2020-07-20 13:37:29,852 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:29,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:37:29,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65372785] [2020-07-20 13:37:29,853 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:37:29,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:29,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:37:29,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:37:29,854 INFO L87 Difference]: Start difference. First operand 184 states and 398 transitions. Second operand 17 states. [2020-07-20 13:37:30,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:30,170 INFO L93 Difference]: Finished difference Result 262 states and 628 transitions. [2020-07-20 13:37:30,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:37:30,172 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 568 [2020-07-20 13:37:30,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:30,176 INFO L225 Difference]: With dead ends: 262 [2020-07-20 13:37:30,176 INFO L226 Difference]: Without dead ends: 253 [2020-07-20 13:37:30,178 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1141 GetRequests, 1107 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:37:30,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2020-07-20 13:37:30,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 181. [2020-07-20 13:37:30,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2020-07-20 13:37:30,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 388 transitions. [2020-07-20 13:37:30,195 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 388 transitions. Word has length 568 [2020-07-20 13:37:30,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:30,196 INFO L479 AbstractCegarLoop]: Abstraction has 181 states and 388 transitions. [2020-07-20 13:37:30,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:37:30,196 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 388 transitions. [2020-07-20 13:37:30,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 420 [2020-07-20 13:37:30,201 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:30,201 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 23, 23, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:30,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:30,408 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:30,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:30,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1015138663, now seen corresponding path program 27 times [2020-07-20 13:37:30,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:30,410 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [388925438] [2020-07-20 13:37:30,410 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:31,042 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:37:31,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:31,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 933 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:37:31,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:31,275 INFO L134 CoverageAnalysis]: Checked inductivity of 4946 backedges. 486 proven. 383 refuted. 0 times theorem prover too weak. 4077 trivial. 0 not checked. [2020-07-20 13:37:31,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:33,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:33,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:33,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:33,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:33,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:33,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:33,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:34,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:34,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:34,725 INFO L134 CoverageAnalysis]: Checked inductivity of 4946 backedges. 490 proven. 393 refuted. 0 times theorem prover too weak. 4063 trivial. 0 not checked. [2020-07-20 13:37:34,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [388925438] [2020-07-20 13:37:34,726 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:34,726 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:37:34,726 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921274353] [2020-07-20 13:37:34,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:37:34,727 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:34,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:37:34,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:37:34,727 INFO L87 Difference]: Start difference. First operand 181 states and 388 transitions. Second operand 17 states. [2020-07-20 13:37:35,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:35,072 INFO L93 Difference]: Finished difference Result 220 states and 475 transitions. [2020-07-20 13:37:35,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:37:35,074 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 419 [2020-07-20 13:37:35,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:35,078 INFO L225 Difference]: With dead ends: 220 [2020-07-20 13:37:35,078 INFO L226 Difference]: Without dead ends: 211 [2020-07-20 13:37:35,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 843 GetRequests, 809 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:37:35,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2020-07-20 13:37:35,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 168. [2020-07-20 13:37:35,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2020-07-20 13:37:35,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 336 transitions. [2020-07-20 13:37:35,097 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 336 transitions. Word has length 419 [2020-07-20 13:37:35,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:35,098 INFO L479 AbstractCegarLoop]: Abstraction has 168 states and 336 transitions. [2020-07-20 13:37:35,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:37:35,098 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 336 transitions. [2020-07-20 13:37:35,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 487 [2020-07-20 13:37:35,104 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:35,104 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 34, 34, 27, 26, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 11, 9, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:35,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:35,320 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:35,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:35,321 INFO L82 PathProgramCache]: Analyzing trace with hash -63656800, now seen corresponding path program 28 times [2020-07-20 13:37:35,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:35,322 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [288037884] [2020-07-20 13:37:35,322 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:35,966 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:37:35,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:35,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 1082 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:37:35,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:36,172 INFO L134 CoverageAnalysis]: Checked inductivity of 6740 backedges. 629 proven. 590 refuted. 0 times theorem prover too weak. 5521 trivial. 0 not checked. [2020-07-20 13:37:36,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:37,204 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 13:37:38,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:39,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:39,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:39,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:39,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:40,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:40,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:40,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:40,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:40,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:41,090 INFO L134 CoverageAnalysis]: Checked inductivity of 6740 backedges. 631 proven. 612 refuted. 0 times theorem prover too weak. 5497 trivial. 0 not checked. [2020-07-20 13:37:41,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [288037884] [2020-07-20 13:37:41,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:41,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:37:41,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880818770] [2020-07-20 13:37:41,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:37:41,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:41,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:37:41,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:37:41,092 INFO L87 Difference]: Start difference. First operand 168 states and 336 transitions. Second operand 19 states. [2020-07-20 13:37:41,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:41,628 INFO L93 Difference]: Finished difference Result 233 states and 509 transitions. [2020-07-20 13:37:41,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:37:41,629 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 486 [2020-07-20 13:37:41,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:41,633 INFO L225 Difference]: With dead ends: 233 [2020-07-20 13:37:41,633 INFO L226 Difference]: Without dead ends: 215 [2020-07-20 13:37:41,635 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 978 GetRequests, 939 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:37:41,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2020-07-20 13:37:41,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 197. [2020-07-20 13:37:41,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-20 13:37:41,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 448 transitions. [2020-07-20 13:37:41,651 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 448 transitions. Word has length 486 [2020-07-20 13:37:41,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:41,652 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 448 transitions. [2020-07-20 13:37:41,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:37:41,652 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 448 transitions. [2020-07-20 13:37:41,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 597 [2020-07-20 13:37:41,657 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:41,658 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 42, 42, 34, 33, 22, 22, 22, 22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 21, 12, 12, 12, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:41,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:41,859 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:41,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:41,859 INFO L82 PathProgramCache]: Analyzing trace with hash -825589058, now seen corresponding path program 29 times [2020-07-20 13:37:41,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:41,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [284032538] [2020-07-20 13:37:41,860 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:42,527 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:37:42,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:42,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 1080 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 13:37:42,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:42,833 INFO L134 CoverageAnalysis]: Checked inductivity of 10257 backedges. 587 proven. 803 refuted. 0 times theorem prover too weak. 8867 trivial. 0 not checked. [2020-07-20 13:37:42,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:46,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:46,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:46,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:46,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:46,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:46,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:47,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:47,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:47,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:48,010 INFO L134 CoverageAnalysis]: Checked inductivity of 10257 backedges. 587 proven. 817 refuted. 0 times theorem prover too weak. 8853 trivial. 0 not checked. [2020-07-20 13:37:48,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [284032538] [2020-07-20 13:37:48,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:48,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-20 13:37:48,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628421040] [2020-07-20 13:37:48,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:37:48,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:48,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:37:48,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:37:48,012 INFO L87 Difference]: Start difference. First operand 197 states and 448 transitions. Second operand 19 states. [2020-07-20 13:37:48,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:48,553 INFO L93 Difference]: Finished difference Result 232 states and 520 transitions. [2020-07-20 13:37:48,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:37:48,555 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 596 [2020-07-20 13:37:48,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:48,559 INFO L225 Difference]: With dead ends: 232 [2020-07-20 13:37:48,559 INFO L226 Difference]: Without dead ends: 214 [2020-07-20 13:37:48,561 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1197 GetRequests, 1161 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:37:48,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2020-07-20 13:37:48,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 176. [2020-07-20 13:37:48,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 13:37:48,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 353 transitions. [2020-07-20 13:37:48,576 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 353 transitions. Word has length 596 [2020-07-20 13:37:48,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:48,576 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 353 transitions. [2020-07-20 13:37:48,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:37:48,576 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 353 transitions. [2020-07-20 13:37:48,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 463 [2020-07-20 13:37:48,580 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:48,581 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 27, 26, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 9, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:48,781 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:48,782 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:48,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:48,783 INFO L82 PathProgramCache]: Analyzing trace with hash 544929534, now seen corresponding path program 30 times [2020-07-20 13:37:48,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:48,783 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [265857970] [2020-07-20 13:37:48,783 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:49,501 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:37:49,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:49,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 1028 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:37:49,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:49,700 INFO L134 CoverageAnalysis]: Checked inductivity of 6056 backedges. 782 proven. 346 refuted. 0 times theorem prover too weak. 4928 trivial. 0 not checked. [2020-07-20 13:37:49,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:51,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:51,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:52,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:52,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:53,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:53,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:53,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:53,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:53,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:53,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:54,754 INFO L134 CoverageAnalysis]: Checked inductivity of 6056 backedges. 786 proven. 363 refuted. 0 times theorem prover too weak. 4907 trivial. 0 not checked. [2020-07-20 13:37:54,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [265857970] [2020-07-20 13:37:54,755 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:54,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:37:54,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067998207] [2020-07-20 13:37:54,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:37:54,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:54,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:37:54,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:37:54,756 INFO L87 Difference]: Start difference. First operand 176 states and 353 transitions. Second operand 19 states. [2020-07-20 13:37:55,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:55,242 INFO L93 Difference]: Finished difference Result 237 states and 524 transitions. [2020-07-20 13:37:55,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:37:55,243 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 462 [2020-07-20 13:37:55,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:55,247 INFO L225 Difference]: With dead ends: 237 [2020-07-20 13:37:55,247 INFO L226 Difference]: Without dead ends: 222 [2020-07-20 13:37:55,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 930 GetRequests, 891 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:37:55,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2020-07-20 13:37:55,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 186. [2020-07-20 13:37:55,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2020-07-20 13:37:55,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 374 transitions. [2020-07-20 13:37:55,271 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 374 transitions. Word has length 462 [2020-07-20 13:37:55,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:55,271 INFO L479 AbstractCegarLoop]: Abstraction has 186 states and 374 transitions. [2020-07-20 13:37:55,271 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:37:55,272 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 374 transitions. [2020-07-20 13:37:55,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-20 13:37:55,278 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:55,278 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 27, 25, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 11, 9, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:55,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:55,493 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:55,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:55,493 INFO L82 PathProgramCache]: Analyzing trace with hash -2009343745, now seen corresponding path program 31 times [2020-07-20 13:37:55,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:55,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1386112104] [2020-07-20 13:37:55,494 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:56,237 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:37:56,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:56,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 999 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:37:56,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:56,422 INFO L134 CoverageAnalysis]: Checked inductivity of 5707 backedges. 675 proven. 264 refuted. 0 times theorem prover too weak. 4768 trivial. 0 not checked. [2020-07-20 13:37:56,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:58,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:58,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:58,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:58,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:58,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:59,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:59,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:59,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:59,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:59,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:59,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:00,603 INFO L134 CoverageAnalysis]: Checked inductivity of 5707 backedges. 677 proven. 278 refuted. 0 times theorem prover too weak. 4752 trivial. 0 not checked. [2020-07-20 13:38:00,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1386112104] [2020-07-20 13:38:00,604 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:00,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:38:00,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303003942] [2020-07-20 13:38:00,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:38:00,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:00,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:38:00,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:38:00,606 INFO L87 Difference]: Start difference. First operand 186 states and 374 transitions. Second operand 17 states. [2020-07-20 13:38:01,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:01,081 INFO L93 Difference]: Finished difference Result 289 states and 660 transitions. [2020-07-20 13:38:01,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:38:01,083 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 449 [2020-07-20 13:38:01,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:01,088 INFO L225 Difference]: With dead ends: 289 [2020-07-20 13:38:01,088 INFO L226 Difference]: Without dead ends: 274 [2020-07-20 13:38:01,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 903 GetRequests, 869 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:38:01,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-20 13:38:01,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 181. [2020-07-20 13:38:01,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2020-07-20 13:38:01,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 352 transitions. [2020-07-20 13:38:01,112 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 352 transitions. Word has length 449 [2020-07-20 13:38:01,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:01,113 INFO L479 AbstractCegarLoop]: Abstraction has 181 states and 352 transitions. [2020-07-20 13:38:01,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:38:01,113 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 352 transitions. [2020-07-20 13:38:01,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2020-07-20 13:38:01,117 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:01,117 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 28, 28, 24, 24, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 10, 9, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:01,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:01,318 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:01,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:01,319 INFO L82 PathProgramCache]: Analyzing trace with hash -443177628, now seen corresponding path program 32 times [2020-07-20 13:38:01,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:01,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [164271947] [2020-07-20 13:38:01,320 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:02,053 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:02,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:02,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 910 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:38:02,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:02,198 INFO L134 CoverageAnalysis]: Checked inductivity of 4708 backedges. 568 proven. 161 refuted. 0 times theorem prover too weak. 3979 trivial. 0 not checked. [2020-07-20 13:38:02,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:03,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:03,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:03,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:03,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:03,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:03,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:03,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:04,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:05,263 INFO L134 CoverageAnalysis]: Checked inductivity of 4708 backedges. 570 proven. 169 refuted. 0 times theorem prover too weak. 3969 trivial. 0 not checked. [2020-07-20 13:38:05,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [164271947] [2020-07-20 13:38:05,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:05,264 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:38:05,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403939533] [2020-07-20 13:38:05,264 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:38:05,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:05,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:38:05,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:38:05,265 INFO L87 Difference]: Start difference. First operand 181 states and 352 transitions. Second operand 15 states. [2020-07-20 13:38:05,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:05,648 INFO L93 Difference]: Finished difference Result 325 states and 852 transitions. [2020-07-20 13:38:05,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:38:05,650 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 409 [2020-07-20 13:38:05,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:05,657 INFO L225 Difference]: With dead ends: 325 [2020-07-20 13:38:05,657 INFO L226 Difference]: Without dead ends: 310 [2020-07-20 13:38:05,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 822 GetRequests, 793 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:38:05,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2020-07-20 13:38:05,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 183. [2020-07-20 13:38:05,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2020-07-20 13:38:05,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 364 transitions. [2020-07-20 13:38:05,679 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 364 transitions. Word has length 409 [2020-07-20 13:38:05,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:05,680 INFO L479 AbstractCegarLoop]: Abstraction has 183 states and 364 transitions. [2020-07-20 13:38:05,680 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:38:05,680 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 364 transitions. [2020-07-20 13:38:05,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 422 [2020-07-20 13:38:05,684 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:05,684 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 24, 24, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 9, 9, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:05,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:05,887 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:05,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:05,888 INFO L82 PathProgramCache]: Analyzing trace with hash -218823077, now seen corresponding path program 33 times [2020-07-20 13:38:05,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:05,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [17289802] [2020-07-20 13:38:05,889 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:06,579 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:06,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:06,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 937 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:38:06,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:06,758 INFO L134 CoverageAnalysis]: Checked inductivity of 4992 backedges. 685 proven. 189 refuted. 0 times theorem prover too weak. 4118 trivial. 0 not checked. [2020-07-20 13:38:06,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:08,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:08,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:08,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:09,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:09,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:09,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:09,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:09,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:09,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:09,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:09,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:10,801 INFO L134 CoverageAnalysis]: Checked inductivity of 4992 backedges. 689 proven. 199 refuted. 0 times theorem prover too weak. 4104 trivial. 0 not checked. [2020-07-20 13:38:10,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [17289802] [2020-07-20 13:38:10,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:10,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:38:10,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324057867] [2020-07-20 13:38:10,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:38:10,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:10,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:38:10,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:38:10,803 INFO L87 Difference]: Start difference. First operand 183 states and 364 transitions. Second operand 17 states. [2020-07-20 13:38:11,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:11,336 INFO L93 Difference]: Finished difference Result 259 states and 557 transitions. [2020-07-20 13:38:11,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:38:11,338 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 421 [2020-07-20 13:38:11,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:11,342 INFO L225 Difference]: With dead ends: 259 [2020-07-20 13:38:11,342 INFO L226 Difference]: Without dead ends: 244 [2020-07-20 13:38:11,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 847 GetRequests, 813 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:38:11,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2020-07-20 13:38:11,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 176. [2020-07-20 13:38:11,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 13:38:11,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 333 transitions. [2020-07-20 13:38:11,364 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 333 transitions. Word has length 421 [2020-07-20 13:38:11,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:11,364 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 333 transitions. [2020-07-20 13:38:11,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:38:11,364 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 333 transitions. [2020-07-20 13:38:11,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 449 [2020-07-20 13:38:11,371 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:11,371 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 27, 24, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 11, 9, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:11,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:11,586 INFO L427 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:11,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:11,586 INFO L82 PathProgramCache]: Analyzing trace with hash -749043809, now seen corresponding path program 34 times [2020-07-20 13:38:11,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:11,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [164769175] [2020-07-20 13:38:11,587 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:12,299 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:12,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:12,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 997 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:38:12,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:12,487 INFO L134 CoverageAnalysis]: Checked inductivity of 5683 backedges. 794 proven. 158 refuted. 0 times theorem prover too weak. 4731 trivial. 0 not checked. [2020-07-20 13:38:12,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:14,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:14,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:14,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:14,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:14,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:15,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:15,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:15,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:15,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:15,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:15,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:16,751 INFO L134 CoverageAnalysis]: Checked inductivity of 5683 backedges. 794 proven. 180 refuted. 0 times theorem prover too weak. 4709 trivial. 0 not checked. [2020-07-20 13:38:16,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [164769175] [2020-07-20 13:38:16,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:16,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:38:16,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754103770] [2020-07-20 13:38:16,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:38:16,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:16,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:38:16,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:38:16,753 INFO L87 Difference]: Start difference. First operand 176 states and 333 transitions. Second operand 17 states. [2020-07-20 13:38:17,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:17,327 INFO L93 Difference]: Finished difference Result 226 states and 445 transitions. [2020-07-20 13:38:17,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:38:17,327 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 448 [2020-07-20 13:38:17,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:17,331 INFO L225 Difference]: With dead ends: 226 [2020-07-20 13:38:17,331 INFO L226 Difference]: Without dead ends: 211 [2020-07-20 13:38:17,333 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 901 GetRequests, 867 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:38:17,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2020-07-20 13:38:17,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 187. [2020-07-20 13:38:17,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2020-07-20 13:38:17,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 352 transitions. [2020-07-20 13:38:17,354 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 352 transitions. Word has length 448 [2020-07-20 13:38:17,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:17,355 INFO L479 AbstractCegarLoop]: Abstraction has 187 states and 352 transitions. [2020-07-20 13:38:17,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:38:17,355 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 352 transitions. [2020-07-20 13:38:17,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 13:38:17,362 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:17,362 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 28, 26, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 11, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:17,575 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:17,576 INFO L427 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:17,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:17,577 INFO L82 PathProgramCache]: Analyzing trace with hash -1385297452, now seen corresponding path program 35 times [2020-07-20 13:38:17,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:17,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [840671604] [2020-07-20 13:38:17,578 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:18,320 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:18,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:18,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 1084 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:38:18,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:18,510 INFO L134 CoverageAnalysis]: Checked inductivity of 6759 backedges. 630 proven. 222 refuted. 0 times theorem prover too weak. 5907 trivial. 0 not checked. [2020-07-20 13:38:18,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:19,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:20,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:20,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:20,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:20,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:20,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:20,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:21,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:22,344 INFO L134 CoverageAnalysis]: Checked inductivity of 6759 backedges. 630 proven. 232 refuted. 0 times theorem prover too weak. 5897 trivial. 0 not checked. [2020-07-20 13:38:22,344 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [840671604] [2020-07-20 13:38:22,344 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:22,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:38:22,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371300011] [2020-07-20 13:38:22,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:38:22,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:22,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:38:22,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:38:22,346 INFO L87 Difference]: Start difference. First operand 187 states and 352 transitions. Second operand 15 states. [2020-07-20 13:38:22,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:22,746 INFO L93 Difference]: Finished difference Result 286 states and 617 transitions. [2020-07-20 13:38:22,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:38:22,748 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 487 [2020-07-20 13:38:22,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:22,753 INFO L225 Difference]: With dead ends: 286 [2020-07-20 13:38:22,753 INFO L226 Difference]: Without dead ends: 271 [2020-07-20 13:38:22,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 978 GetRequests, 949 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:38:22,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2020-07-20 13:38:22,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 190. [2020-07-20 13:38:22,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-20 13:38:22,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 368 transitions. [2020-07-20 13:38:22,774 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 368 transitions. Word has length 487 [2020-07-20 13:38:22,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:22,775 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 368 transitions. [2020-07-20 13:38:22,775 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:38:22,775 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 368 transitions. [2020-07-20 13:38:22,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2020-07-20 13:38:22,781 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:22,781 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 30, 30, 26, 26, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 11, 10, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:22,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:22,997 INFO L427 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:22,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:22,998 INFO L82 PathProgramCache]: Analyzing trace with hash 345765340, now seen corresponding path program 36 times [2020-07-20 13:38:22,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:22,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [857951335] [2020-07-20 13:38:22,999 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:23,724 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:38:23,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:23,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 796 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:38:23,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:23,951 INFO L134 CoverageAnalysis]: Checked inductivity of 5402 backedges. 243 proven. 841 refuted. 0 times theorem prover too weak. 4318 trivial. 0 not checked. [2020-07-20 13:38:23,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:27,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:28,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:28,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:28,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:29,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:29,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:29,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:29,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:29,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:29,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:29,757 INFO L134 CoverageAnalysis]: Checked inductivity of 5402 backedges. 251 proven. 857 refuted. 0 times theorem prover too weak. 4294 trivial. 0 not checked. [2020-07-20 13:38:29,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [857951335] [2020-07-20 13:38:29,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:29,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:38:29,758 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687907136] [2020-07-20 13:38:29,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:38:29,758 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:29,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:38:29,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:38:29,759 INFO L87 Difference]: Start difference. First operand 190 states and 368 transitions. Second operand 19 states. [2020-07-20 13:38:30,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:30,599 INFO L93 Difference]: Finished difference Result 382 states and 863 transitions. [2020-07-20 13:38:30,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:38:30,601 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 437 [2020-07-20 13:38:30,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:30,606 INFO L225 Difference]: With dead ends: 382 [2020-07-20 13:38:30,606 INFO L226 Difference]: Without dead ends: 211 [2020-07-20 13:38:30,610 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 880 GetRequests, 841 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:38:30,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2020-07-20 13:38:30,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 182. [2020-07-20 13:38:30,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2020-07-20 13:38:30,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 343 transitions. [2020-07-20 13:38:30,626 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 343 transitions. Word has length 437 [2020-07-20 13:38:30,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:30,626 INFO L479 AbstractCegarLoop]: Abstraction has 182 states and 343 transitions. [2020-07-20 13:38:30,626 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:38:30,626 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 343 transitions. [2020-07-20 13:38:30,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-20 13:38:30,632 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:30,632 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 26, 26, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 10, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:30,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:30,833 INFO L427 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:30,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:30,834 INFO L82 PathProgramCache]: Analyzing trace with hash -388510645, now seen corresponding path program 37 times [2020-07-20 13:38:30,835 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:30,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1918406157] [2020-07-20 13:38:30,835 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:31,587 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:31,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:31,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 999 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:38:31,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:31,799 INFO L134 CoverageAnalysis]: Checked inductivity of 5706 backedges. 875 proven. 239 refuted. 0 times theorem prover too weak. 4592 trivial. 0 not checked. [2020-07-20 13:38:31,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:34,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:35,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:35,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:35,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:35,931 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:36,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:36,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:36,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:36,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:37,925 INFO L134 CoverageAnalysis]: Checked inductivity of 5706 backedges. 877 proven. 261 refuted. 0 times theorem prover too weak. 4568 trivial. 0 not checked. [2020-07-20 13:38:37,926 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1918406157] [2020-07-20 13:38:37,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:37,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:38:37,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141327584] [2020-07-20 13:38:37,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:38:37,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:37,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:38:37,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:38:37,927 INFO L87 Difference]: Start difference. First operand 182 states and 343 transitions. Second operand 19 states. [2020-07-20 13:38:38,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:38,713 INFO L93 Difference]: Finished difference Result 255 states and 505 transitions. [2020-07-20 13:38:38,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:38:38,714 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 449 [2020-07-20 13:38:38,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:38,718 INFO L225 Difference]: With dead ends: 255 [2020-07-20 13:38:38,718 INFO L226 Difference]: Without dead ends: 240 [2020-07-20 13:38:38,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 904 GetRequests, 865 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:38:38,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2020-07-20 13:38:38,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 213. [2020-07-20 13:38:38,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2020-07-20 13:38:38,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 432 transitions. [2020-07-20 13:38:38,737 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 432 transitions. Word has length 449 [2020-07-20 13:38:38,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:38,737 INFO L479 AbstractCegarLoop]: Abstraction has 213 states and 432 transitions. [2020-07-20 13:38:38,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:38:38,738 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 432 transitions. [2020-07-20 13:38:38,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 462 [2020-07-20 13:38:38,741 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:38,742 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 27, 25, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:38,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:38,943 INFO L427 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:38,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:38,944 INFO L82 PathProgramCache]: Analyzing trace with hash -1542449334, now seen corresponding path program 38 times [2020-07-20 13:38:38,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:38,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1588382170] [2020-07-20 13:38:38,945 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:39,723 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:39,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:39,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 1026 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:38:39,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:39,949 INFO L134 CoverageAnalysis]: Checked inductivity of 6031 backedges. 833 proven. 136 refuted. 0 times theorem prover too weak. 5062 trivial. 0 not checked. [2020-07-20 13:38:39,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:42,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:42,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:42,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:42,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:42,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:42,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:42,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:42,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:43,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:43,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:43,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:43,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:45,398 INFO L134 CoverageAnalysis]: Checked inductivity of 6031 backedges. 839 proven. 144 refuted. 0 times theorem prover too weak. 5048 trivial. 0 not checked. [2020-07-20 13:38:45,399 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1588382170] [2020-07-20 13:38:45,399 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:45,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:38:45,399 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092185010] [2020-07-20 13:38:45,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:38:45,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:45,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:38:45,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:38:45,401 INFO L87 Difference]: Start difference. First operand 213 states and 432 transitions. Second operand 17 states. [2020-07-20 13:38:45,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:45,975 INFO L93 Difference]: Finished difference Result 254 states and 511 transitions. [2020-07-20 13:38:45,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:38:45,977 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 461 [2020-07-20 13:38:45,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:45,982 INFO L225 Difference]: With dead ends: 254 [2020-07-20 13:38:45,982 INFO L226 Difference]: Without dead ends: 241 [2020-07-20 13:38:45,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 927 GetRequests, 893 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:38:45,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2020-07-20 13:38:46,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 213. [2020-07-20 13:38:46,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2020-07-20 13:38:46,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 425 transitions. [2020-07-20 13:38:46,007 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 425 transitions. Word has length 461 [2020-07-20 13:38:46,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:46,007 INFO L479 AbstractCegarLoop]: Abstraction has 213 states and 425 transitions. [2020-07-20 13:38:46,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:38:46,007 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 425 transitions. [2020-07-20 13:38:46,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-20 13:38:46,011 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:46,012 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 27, 25, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 11, 9, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:46,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:46,213 INFO L427 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:46,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:46,214 INFO L82 PathProgramCache]: Analyzing trace with hash -1201711827, now seen corresponding path program 39 times [2020-07-20 13:38:46,214 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:46,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [174760347] [2020-07-20 13:38:46,215 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:47,093 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:47,093 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:47,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 999 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:38:47,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:47,320 INFO L134 CoverageAnalysis]: Checked inductivity of 5707 backedges. 745 proven. 214 refuted. 0 times theorem prover too weak. 4748 trivial. 0 not checked. [2020-07-20 13:38:47,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:49,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:49,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:50,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:50,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:50,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:50,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:51,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:51,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:51,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:51,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:51,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:51,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:52,668 INFO L134 CoverageAnalysis]: Checked inductivity of 5707 backedges. 749 proven. 228 refuted. 0 times theorem prover too weak. 4730 trivial. 0 not checked. [2020-07-20 13:38:52,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [174760347] [2020-07-20 13:38:52,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:52,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:38:52,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979195789] [2020-07-20 13:38:52,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:38:52,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:52,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:38:52,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:38:52,670 INFO L87 Difference]: Start difference. First operand 213 states and 425 transitions. Second operand 17 states. [2020-07-20 13:38:53,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:53,138 INFO L93 Difference]: Finished difference Result 307 states and 601 transitions. [2020-07-20 13:38:53,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:38:53,138 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 449 [2020-07-20 13:38:53,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:53,143 INFO L225 Difference]: With dead ends: 307 [2020-07-20 13:38:53,143 INFO L226 Difference]: Without dead ends: 292 [2020-07-20 13:38:53,146 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 903 GetRequests, 869 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:38:53,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2020-07-20 13:38:53,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 207. [2020-07-20 13:38:53,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2020-07-20 13:38:53,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 395 transitions. [2020-07-20 13:38:53,166 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 395 transitions. Word has length 449 [2020-07-20 13:38:53,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:53,167 INFO L479 AbstractCegarLoop]: Abstraction has 207 states and 395 transitions. [2020-07-20 13:38:53,167 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:38:53,167 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 395 transitions. [2020-07-20 13:38:53,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 474 [2020-07-20 13:38:53,171 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:53,172 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 27, 25, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 10, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:53,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:53,373 INFO L427 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:53,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:53,374 INFO L82 PathProgramCache]: Analyzing trace with hash -827191945, now seen corresponding path program 40 times [2020-07-20 13:38:53,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:53,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1367346858] [2020-07-20 13:38:53,375 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:54,202 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:54,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:54,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 1053 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:38:54,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:54,501 INFO L134 CoverageAnalysis]: Checked inductivity of 6363 backedges. 702 proven. 126 refuted. 0 times theorem prover too weak. 5535 trivial. 0 not checked. [2020-07-20 13:38:54,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:56,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:56,233 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:56,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:56,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:56,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:56,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:56,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:56,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:56,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:57,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:57,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:59,199 INFO L134 CoverageAnalysis]: Checked inductivity of 6363 backedges. 704 proven. 134 refuted. 0 times theorem prover too weak. 5525 trivial. 0 not checked. [2020-07-20 13:38:59,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1367346858] [2020-07-20 13:38:59,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:59,200 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:38:59,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632606070] [2020-07-20 13:38:59,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:38:59,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:59,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:38:59,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:38:59,202 INFO L87 Difference]: Start difference. First operand 207 states and 395 transitions. Second operand 15 states. [2020-07-20 13:38:59,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:59,666 INFO L93 Difference]: Finished difference Result 270 states and 553 transitions. [2020-07-20 13:38:59,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:38:59,668 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 473 [2020-07-20 13:38:59,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:59,673 INFO L225 Difference]: With dead ends: 270 [2020-07-20 13:38:59,673 INFO L226 Difference]: Without dead ends: 257 [2020-07-20 13:38:59,676 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 950 GetRequests, 921 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:38:59,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-20 13:38:59,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 202. [2020-07-20 13:38:59,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2020-07-20 13:38:59,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 380 transitions. [2020-07-20 13:38:59,704 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 380 transitions. Word has length 473 [2020-07-20 13:38:59,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:59,704 INFO L479 AbstractCegarLoop]: Abstraction has 202 states and 380 transitions. [2020-07-20 13:38:59,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:38:59,704 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 380 transitions. [2020-07-20 13:38:59,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2020-07-20 13:38:59,711 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:59,711 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 26, 26, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 11, 10, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:59,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:59,923 INFO L427 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:59,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:59,924 INFO L82 PathProgramCache]: Analyzing trace with hash 551286962, now seen corresponding path program 41 times [2020-07-20 13:38:59,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:59,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [422671400] [2020-07-20 13:38:59,925 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:00,742 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:39:00,742 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:00,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 972 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:39:00,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:00,928 INFO L134 CoverageAnalysis]: Checked inductivity of 5394 backedges. 605 proven. 172 refuted. 0 times theorem prover too weak. 4617 trivial. 0 not checked. [2020-07-20 13:39:00,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:02,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:03,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:03,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:03,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:03,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:04,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:05,544 INFO L134 CoverageAnalysis]: Checked inductivity of 5394 backedges. 605 proven. 184 refuted. 0 times theorem prover too weak. 4605 trivial. 0 not checked. [2020-07-20 13:39:05,544 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [422671400] [2020-07-20 13:39:05,544 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:05,544 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:39:05,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031872255] [2020-07-20 13:39:05,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:39:05,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:05,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:39:05,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:39:05,547 INFO L87 Difference]: Start difference. First operand 202 states and 380 transitions. Second operand 15 states. [2020-07-20 13:39:06,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:39:06,061 INFO L93 Difference]: Finished difference Result 309 states and 671 transitions. [2020-07-20 13:39:06,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:39:06,064 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 437 [2020-07-20 13:39:06,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:39:06,070 INFO L225 Difference]: With dead ends: 309 [2020-07-20 13:39:06,070 INFO L226 Difference]: Without dead ends: 294 [2020-07-20 13:39:06,073 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 878 GetRequests, 849 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:39:06,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2020-07-20 13:39:06,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 209. [2020-07-20 13:39:06,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2020-07-20 13:39:06,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 410 transitions. [2020-07-20 13:39:06,093 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 410 transitions. Word has length 437 [2020-07-20 13:39:06,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:39:06,093 INFO L479 AbstractCegarLoop]: Abstraction has 209 states and 410 transitions. [2020-07-20 13:39:06,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:39:06,094 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 410 transitions. [2020-07-20 13:39:06,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 13:39:06,101 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:39:06,101 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 35, 35, 30, 29, 19, 19, 19, 19, 19, 19, 19, 17, 17, 17, 17, 17, 17, 17, 13, 10, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:39:06,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:06,315 INFO L427 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:39:06,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:39:06,316 INFO L82 PathProgramCache]: Analyzing trace with hash -1638954211, now seen corresponding path program 42 times [2020-07-20 13:39:06,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:39:06,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437165273] [2020-07-20 13:39:06,317 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:07,187 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:39:07,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:07,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 1121 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:39:07,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:07,473 INFO L134 CoverageAnalysis]: Checked inductivity of 7261 backedges. 1049 proven. 215 refuted. 0 times theorem prover too weak. 5997 trivial. 0 not checked. [2020-07-20 13:39:07,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:10,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:10,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:11,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:11,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:11,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:12,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:12,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:12,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:12,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:12,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:13,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:15,028 INFO L134 CoverageAnalysis]: Checked inductivity of 7261 backedges. 1049 proven. 239 refuted. 0 times theorem prover too weak. 5973 trivial. 0 not checked. [2020-07-20 13:39:15,028 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [437165273] [2020-07-20 13:39:15,028 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:15,029 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:39:15,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682804383] [2020-07-20 13:39:15,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:39:15,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:15,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:39:15,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:39:15,030 INFO L87 Difference]: Start difference. First operand 209 states and 410 transitions. Second operand 19 states. [2020-07-20 13:39:15,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:39:15,958 INFO L93 Difference]: Finished difference Result 283 states and 573 transitions. [2020-07-20 13:39:15,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:39:15,958 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 504 [2020-07-20 13:39:15,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:39:15,963 INFO L225 Difference]: With dead ends: 283 [2020-07-20 13:39:15,963 INFO L226 Difference]: Without dead ends: 270 [2020-07-20 13:39:15,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1014 GetRequests, 975 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:39:15,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2020-07-20 13:39:15,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 214. [2020-07-20 13:39:15,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2020-07-20 13:39:15,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 434 transitions. [2020-07-20 13:39:15,988 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 434 transitions. Word has length 504 [2020-07-20 13:39:15,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:39:15,989 INFO L479 AbstractCegarLoop]: Abstraction has 214 states and 434 transitions. [2020-07-20 13:39:15,989 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:39:15,989 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 434 transitions. [2020-07-20 13:39:15,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 500 [2020-07-20 13:39:15,994 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:39:15,994 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 33, 33, 27, 27, 20, 20, 20, 20, 20, 20, 20, 16, 16, 16, 16, 16, 16, 16, 13, 11, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:39:16,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:16,195 INFO L427 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:39:16,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:39:16,196 INFO L82 PathProgramCache]: Analyzing trace with hash 1075307955, now seen corresponding path program 43 times [2020-07-20 13:39:16,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:39:16,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1498379532] [2020-07-20 13:39:16,197 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:17,052 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:39:17,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:17,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 906 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 13:39:17,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:17,390 INFO L134 CoverageAnalysis]: Checked inductivity of 7174 backedges. 273 proven. 1035 refuted. 0 times theorem prover too weak. 5866 trivial. 0 not checked. [2020-07-20 13:39:17,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:19,460 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 39 [2020-07-20 13:39:22,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:22,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:23,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:24,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:24,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:25,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:25,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:25,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:25,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:25,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:25,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:26,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:26,415 INFO L134 CoverageAnalysis]: Checked inductivity of 7174 backedges. 274 proven. 1055 refuted. 0 times theorem prover too weak. 5845 trivial. 0 not checked. [2020-07-20 13:39:26,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1498379532] [2020-07-20 13:39:26,416 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:26,416 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 18] total 21 [2020-07-20 13:39:26,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375162174] [2020-07-20 13:39:26,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:39:26,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:26,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:39:26,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:39:26,417 INFO L87 Difference]: Start difference. First operand 214 states and 434 transitions. Second operand 21 states. [2020-07-20 13:39:27,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:39:27,494 INFO L93 Difference]: Finished difference Result 397 states and 923 transitions. [2020-07-20 13:39:27,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:39:27,498 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 499 [2020-07-20 13:39:27,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:39:27,503 INFO L225 Difference]: With dead ends: 397 [2020-07-20 13:39:27,504 INFO L226 Difference]: Without dead ends: 220 [2020-07-20 13:39:27,509 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1004 GetRequests, 963 SyntacticMatches, 15 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=161, Invalid=595, Unknown=0, NotChecked=0, Total=756 [2020-07-20 13:39:27,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2020-07-20 13:39:27,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 214. [2020-07-20 13:39:27,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2020-07-20 13:39:27,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 434 transitions. [2020-07-20 13:39:27,532 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 434 transitions. Word has length 499 [2020-07-20 13:39:27,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:39:27,533 INFO L479 AbstractCegarLoop]: Abstraction has 214 states and 434 transitions. [2020-07-20 13:39:27,533 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:39:27,533 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 434 transitions. [2020-07-20 13:39:27,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 13:39:27,539 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:39:27,540 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 36, 29, 28, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 11, 10, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:39:27,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:27,741 INFO L427 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:39:27,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:39:27,742 INFO L82 PathProgramCache]: Analyzing trace with hash 740473571, now seen corresponding path program 44 times [2020-07-20 13:39:27,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:39:27,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340942068] [2020-07-20 13:39:27,743 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:28,651 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:39:28,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:28,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 1117 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:39:28,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:28,957 INFO L134 CoverageAnalysis]: Checked inductivity of 7192 backedges. 971 proven. 291 refuted. 0 times theorem prover too weak. 5930 trivial. 0 not checked. [2020-07-20 13:39:28,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:32,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:32,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:33,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:34,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:34,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:35,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:35,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:35,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:35,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:36,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:37,947 INFO L134 CoverageAnalysis]: Checked inductivity of 7192 backedges. 975 proven. 313 refuted. 0 times theorem prover too weak. 5904 trivial. 0 not checked. [2020-07-20 13:39:37,947 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340942068] [2020-07-20 13:39:37,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:37,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 13:39:37,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619132441] [2020-07-20 13:39:37,949 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 13:39:37,949 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:37,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 13:39:37,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:39:37,949 INFO L87 Difference]: Start difference. First operand 214 states and 434 transitions. Second operand 20 states. [2020-07-20 13:39:38,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:39:38,877 INFO L93 Difference]: Finished difference Result 296 states and 628 transitions. [2020-07-20 13:39:38,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:39:38,881 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 502 [2020-07-20 13:39:38,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:39:38,888 INFO L225 Difference]: With dead ends: 296 [2020-07-20 13:39:38,888 INFO L226 Difference]: Without dead ends: 281 [2020-07-20 13:39:38,890 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1010 GetRequests, 971 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:39:38,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2020-07-20 13:39:38,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 219. [2020-07-20 13:39:38,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2020-07-20 13:39:38,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 444 transitions. [2020-07-20 13:39:38,912 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 444 transitions. Word has length 502 [2020-07-20 13:39:38,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:39:38,913 INFO L479 AbstractCegarLoop]: Abstraction has 219 states and 444 transitions. [2020-07-20 13:39:38,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 13:39:38,913 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 444 transitions. [2020-07-20 13:39:38,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 463 [2020-07-20 13:39:38,918 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:39:38,918 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 27, 26, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 9, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:39:39,119 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:39,119 INFO L427 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:39:39,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:39:39,120 INFO L82 PathProgramCache]: Analyzing trace with hash 445159874, now seen corresponding path program 45 times [2020-07-20 13:39:39,121 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:39:39,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1739880548] [2020-07-20 13:39:39,121 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:40,015 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:39:40,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:40,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 1028 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:39:40,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:40,209 INFO L134 CoverageAnalysis]: Checked inductivity of 6056 backedges. 545 proven. 116 refuted. 0 times theorem prover too weak. 5395 trivial. 0 not checked. [2020-07-20 13:39:40,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:41,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:41,931 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:42,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:42,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:42,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:42,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:42,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:42,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:43,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:45,291 INFO L134 CoverageAnalysis]: Checked inductivity of 6056 backedges. 545 proven. 123 refuted. 0 times theorem prover too weak. 5388 trivial. 0 not checked. [2020-07-20 13:39:45,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1739880548] [2020-07-20 13:39:45,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:45,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 13:39:45,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895498238] [2020-07-20 13:39:45,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:39:45,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:45,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:39:45,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:39:45,293 INFO L87 Difference]: Start difference. First operand 219 states and 444 transitions. Second operand 13 states. [2020-07-20 13:39:45,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:39:45,736 INFO L93 Difference]: Finished difference Result 270 states and 611 transitions. [2020-07-20 13:39:45,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:39:45,739 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 462 [2020-07-20 13:39:45,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:39:45,744 INFO L225 Difference]: With dead ends: 270 [2020-07-20 13:39:45,744 INFO L226 Difference]: Without dead ends: 260 [2020-07-20 13:39:45,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 927 GetRequests, 903 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:39:45,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2020-07-20 13:39:45,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 219. [2020-07-20 13:39:45,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2020-07-20 13:39:45,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 444 transitions. [2020-07-20 13:39:45,768 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 444 transitions. Word has length 462 [2020-07-20 13:39:45,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:39:45,768 INFO L479 AbstractCegarLoop]: Abstraction has 219 states and 444 transitions. [2020-07-20 13:39:45,768 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:39:45,769 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 444 transitions. [2020-07-20 13:39:45,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 487 [2020-07-20 13:39:45,774 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:39:45,774 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 34, 34, 27, 26, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 11, 9, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:39:45,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:45,975 INFO L427 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:39:45,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:39:45,976 INFO L82 PathProgramCache]: Analyzing trace with hash -904912734, now seen corresponding path program 46 times [2020-07-20 13:39:45,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:39:45,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1933442964] [2020-07-20 13:39:45,977 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:47,031 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:39:47,032 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:47,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 1082 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:39:47,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:47,291 INFO L134 CoverageAnalysis]: Checked inductivity of 6740 backedges. 725 proven. 131 refuted. 0 times theorem prover too weak. 5884 trivial. 0 not checked. [2020-07-20 13:39:47,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:49,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:49,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:49,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:50,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:50,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:50,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:50,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:50,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:50,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:51,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:53,480 INFO L134 CoverageAnalysis]: Checked inductivity of 6740 backedges. 727 proven. 139 refuted. 0 times theorem prover too weak. 5874 trivial. 0 not checked. [2020-07-20 13:39:53,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1933442964] [2020-07-20 13:39:53,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:53,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 13:39:53,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231677450] [2020-07-20 13:39:53,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:39:53,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:53,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:39:53,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:39:53,483 INFO L87 Difference]: Start difference. First operand 219 states and 444 transitions. Second operand 15 states. [2020-07-20 13:39:54,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:39:54,150 INFO L93 Difference]: Finished difference Result 262 states and 546 transitions. [2020-07-20 13:39:54,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:39:54,155 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 486 [2020-07-20 13:39:54,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:39:54,163 INFO L225 Difference]: With dead ends: 262 [2020-07-20 13:39:54,164 INFO L226 Difference]: Without dead ends: 249 [2020-07-20 13:39:54,168 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 976 GetRequests, 947 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:39:54,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2020-07-20 13:39:54,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 213. [2020-07-20 13:39:54,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2020-07-20 13:39:54,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 435 transitions. [2020-07-20 13:39:54,219 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 435 transitions. Word has length 486 [2020-07-20 13:39:54,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:39:54,220 INFO L479 AbstractCegarLoop]: Abstraction has 213 states and 435 transitions. [2020-07-20 13:39:54,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:39:54,220 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 435 transitions. [2020-07-20 13:39:54,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2020-07-20 13:39:54,232 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:39:54,232 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 36, 29, 28, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 11, 10, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:39:54,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:54,449 INFO L427 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:39:54,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:39:54,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1343294681, now seen corresponding path program 47 times [2020-07-20 13:39:54,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:39:54,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1073924303] [2020-07-20 13:39:54,451 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:55,446 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:39:55,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:55,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 912 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:39:55,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:55,786 INFO L134 CoverageAnalysis]: Checked inductivity of 7192 backedges. 297 proven. 965 refuted. 0 times theorem prover too weak. 5930 trivial. 0 not checked. [2020-07-20 13:39:55,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:56,237 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 13:40:01,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:03,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:03,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:04,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:04,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:04,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:04,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:04,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:04,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:05,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:05,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:05,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:05,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:05,707 INFO L134 CoverageAnalysis]: Checked inductivity of 7192 backedges. 301 proven. 987 refuted. 0 times theorem prover too weak. 5904 trivial. 0 not checked. [2020-07-20 13:40:05,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1073924303] [2020-07-20 13:40:05,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:40:05,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 13:40:05,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979264112] [2020-07-20 13:40:05,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:40:05,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:40:05,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:40:05,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:40:05,711 INFO L87 Difference]: Start difference. First operand 213 states and 435 transitions. Second operand 19 states. [2020-07-20 13:40:06,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:40:06,871 INFO L93 Difference]: Finished difference Result 305 states and 647 transitions. [2020-07-20 13:40:06,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:40:06,874 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 502 [2020-07-20 13:40:06,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:40:06,881 INFO L225 Difference]: With dead ends: 305 [2020-07-20 13:40:06,881 INFO L226 Difference]: Without dead ends: 239 [2020-07-20 13:40:06,884 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1010 GetRequests, 971 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:40:06,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2020-07-20 13:40:06,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 211. [2020-07-20 13:40:06,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 211 states. [2020-07-20 13:40:06,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 429 transitions. [2020-07-20 13:40:06,907 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 429 transitions. Word has length 502 [2020-07-20 13:40:06,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:40:06,908 INFO L479 AbstractCegarLoop]: Abstraction has 211 states and 429 transitions. [2020-07-20 13:40:06,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:40:06,909 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 429 transitions. [2020-07-20 13:40:06,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 476 [2020-07-20 13:40:06,915 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:40:06,916 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 33, 33, 27, 27, 18, 18, 18, 18, 18, 18, 18, 16, 16, 16, 16, 16, 16, 16, 11, 9, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:40:07,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:07,130 INFO L427 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:40:07,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:40:07,132 INFO L82 PathProgramCache]: Analyzing trace with hash -185371053, now seen corresponding path program 48 times [2020-07-20 13:40:07,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:40:07,133 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1866666971] [2020-07-20 13:40:07,133 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:08,120 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:40:08,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:40:08,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 1057 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:40:08,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:40:08,422 INFO L134 CoverageAnalysis]: Checked inductivity of 6426 backedges. 750 proven. 253 refuted. 0 times theorem prover too weak. 5423 trivial. 0 not checked. [2020-07-20 13:40:08,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:40:11,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:12,678 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 13:40:12,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:13,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:13,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:13,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:13,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:14,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:14,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:16,202 INFO L134 CoverageAnalysis]: Checked inductivity of 6426 backedges. 754 proven. 265 refuted. 0 times theorem prover too weak. 5407 trivial. 0 not checked. [2020-07-20 13:40:16,203 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1866666971] [2020-07-20 13:40:16,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:40:16,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:40:16,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275245074] [2020-07-20 13:40:16,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:40:16,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:40:16,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:40:16,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:40:16,205 INFO L87 Difference]: Start difference. First operand 211 states and 429 transitions. Second operand 17 states. [2020-07-20 13:40:16,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:40:16,584 INFO L93 Difference]: Finished difference Result 242 states and 471 transitions. [2020-07-20 13:40:16,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:40:16,587 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 475 [2020-07-20 13:40:16,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:40:16,590 INFO L225 Difference]: With dead ends: 242 [2020-07-20 13:40:16,591 INFO L226 Difference]: Without dead ends: 227 [2020-07-20 13:40:16,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 955 GetRequests, 921 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:40:16,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2020-07-20 13:40:16,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 205. [2020-07-20 13:40:16,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2020-07-20 13:40:16,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 417 transitions. [2020-07-20 13:40:16,609 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 417 transitions. Word has length 475 [2020-07-20 13:40:16,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:40:16,610 INFO L479 AbstractCegarLoop]: Abstraction has 205 states and 417 transitions. [2020-07-20 13:40:16,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:40:16,610 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 417 transitions. [2020-07-20 13:40:16,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-20 13:40:16,614 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:40:16,615 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 28, 28, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 11, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:40:16,815 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:16,816 INFO L427 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:40:16,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:40:16,817 INFO L82 PathProgramCache]: Analyzing trace with hash 797985106, now seen corresponding path program 49 times [2020-07-20 13:40:16,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:40:16,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1607655998] [2020-07-20 13:40:16,818 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:17,832 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:40:17,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:40:17,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 1088 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:40:17,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:40:18,161 INFO L134 CoverageAnalysis]: Checked inductivity of 6812 backedges. 927 proven. 130 refuted. 0 times theorem prover too weak. 5755 trivial. 0 not checked. [2020-07-20 13:40:18,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:40:21,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:22,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:22,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:22,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:22,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:22,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:22,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:22,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:23,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:24,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:26,229 INFO L134 CoverageAnalysis]: Checked inductivity of 6812 backedges. 927 proven. 148 refuted. 0 times theorem prover too weak. 5737 trivial. 0 not checked. [2020-07-20 13:40:26,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1607655998] [2020-07-20 13:40:26,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:40:26,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 13:40:26,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968962925] [2020-07-20 13:40:26,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:40:26,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:40:26,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:40:26,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:40:26,231 INFO L87 Difference]: Start difference. First operand 205 states and 417 transitions. Second operand 17 states. [2020-07-20 13:40:26,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:40:26,991 INFO L93 Difference]: Finished difference Result 221 states and 432 transitions. [2020-07-20 13:40:26,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:40:26,992 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 489 [2020-07-20 13:40:26,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:40:26,995 INFO L225 Difference]: With dead ends: 221 [2020-07-20 13:40:26,996 INFO L226 Difference]: Without dead ends: 208 [2020-07-20 13:40:26,998 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 983 GetRequests, 949 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:40:26,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-20 13:40:27,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 202. [2020-07-20 13:40:27,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2020-07-20 13:40:27,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 412 transitions. [2020-07-20 13:40:27,018 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 412 transitions. Word has length 489 [2020-07-20 13:40:27,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:40:27,018 INFO L479 AbstractCegarLoop]: Abstraction has 202 states and 412 transitions. [2020-07-20 13:40:27,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:40:27,018 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 412 transitions. [2020-07-20 13:40:27,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2020-07-20 13:40:27,024 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:40:27,025 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 27, 27, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:40:27,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:27,240 INFO L427 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:40:27,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:40:27,241 INFO L82 PathProgramCache]: Analyzing trace with hash 1326629730, now seen corresponding path program 50 times [2020-07-20 13:40:27,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:40:27,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [897105256] [2020-07-20 13:40:27,242 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:28,231 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:40:28,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 13:40:28,232 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 13:40:28,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 13:40:28,339 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 13:40:28,485 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 13:40:28,485 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 13:40:28,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:40:28,918 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 01:40:28 BoogieIcfgContainer [2020-07-20 13:40:28,919 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 13:40:28,921 INFO L168 Benchmark]: Toolchain (without parser) took 334553.06 ms. Allocated memory was 145.2 MB in the beginning and 2.0 GB in the end (delta: 1.8 GB). Free memory was 102.4 MB in the beginning and 1.3 GB in the end (delta: -1.2 GB). Peak memory consumption was 592.5 MB. Max. memory is 7.1 GB. [2020-07-20 13:40:28,922 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 145.2 MB. Free memory was 121.4 MB in the beginning and 121.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 13:40:28,922 INFO L168 Benchmark]: CACSL2BoogieTranslator took 244.63 ms. Allocated memory is still 145.2 MB. Free memory was 102.2 MB in the beginning and 92.5 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-07-20 13:40:28,923 INFO L168 Benchmark]: Boogie Preprocessor took 118.04 ms. Allocated memory was 145.2 MB in the beginning and 201.9 MB in the end (delta: 56.6 MB). Free memory was 92.5 MB in the beginning and 181.0 MB in the end (delta: -88.5 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2020-07-20 13:40:28,923 INFO L168 Benchmark]: RCFGBuilder took 296.94 ms. Allocated memory is still 201.9 MB. Free memory was 181.0 MB in the beginning and 168.1 MB in the end (delta: 12.9 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. [2020-07-20 13:40:28,924 INFO L168 Benchmark]: TraceAbstraction took 333885.92 ms. Allocated memory was 201.9 MB in the beginning and 2.0 GB in the end (delta: 1.8 GB). Free memory was 167.4 MB in the beginning and 1.3 GB in the end (delta: -1.2 GB). Peak memory consumption was 600.9 MB. Max. memory is 7.1 GB. [2020-07-20 13:40:28,927 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 145.2 MB. Free memory was 121.4 MB in the beginning and 121.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 244.63 ms. Allocated memory is still 145.2 MB. Free memory was 102.2 MB in the beginning and 92.5 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 118.04 ms. Allocated memory was 145.2 MB in the beginning and 201.9 MB in the end (delta: 56.6 MB). Free memory was 92.5 MB in the beginning and 181.0 MB in the end (delta: -88.5 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 296.94 ms. Allocated memory is still 201.9 MB. Free memory was 181.0 MB in the beginning and 168.1 MB in the end (delta: 12.9 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 333885.92 ms. Allocated memory was 201.9 MB in the beginning and 2.0 GB in the end (delta: 1.8 GB). Free memory was 167.4 MB in the beginning and 1.3 GB in the end (delta: -1.2 GB). Peak memory consumption was 600.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 8; VAL [x=8] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=8] [L8] COND FALSE !(n < 1) VAL [\old(n)=8, n=8] [L10] COND FALSE !(n == 1) VAL [\old(n)=8, n=8] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=7] [L18] COND FALSE !(n < 1) VAL [\old(n)=7, n=7] [L20] COND FALSE !(n == 1) VAL [\old(n)=7, n=7] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=6] [L8] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L10] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=5] [L18] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L20] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=5, fibo1(n-1)=3, n=5] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=5, fibo1(n-1)=3, fibo1(n-2)=2, n=5] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=6, fibo2(n-1)=5, n=6] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=6, fibo2(n-1)=5, fibo2(n-2)=3, n=6] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=7, fibo1(n-1)=8, n=7] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=5] [L8] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L10] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=5, fibo2(n-1)=3, n=5] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=7, fibo1(n-1)=8, fibo1(n-2)=5, n=7] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=8, fibo2(n-1)=13, n=8] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=6] [L18] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L20] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=5] [L8] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L10] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=5, fibo2(n-1)=3, n=5] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=6, fibo1(n-1)=5, n=6] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=6, fibo1(n-1)=5, fibo1(n-2)=3, n=6] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=8, fibo2(n-1)=13, fibo2(n-2)=8, n=8] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=21, x=8] [L37] int result = fibo1(x); [L38] COND TRUE result == 21 VAL [result=21, x=8] [L39] __VERIFIER_error() VAL [result=21, x=8] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 333.5s, OverallIterations: 67, TraceHistogramMax: 45, AutomataDifference: 29.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1831 SDtfs, 3363 SDslu, 12992 SDs, 0 SdLazy, 13938 SolverSat, 3483 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 11.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 49965 GetRequests, 47793 SyntacticMatches, 812 SemanticMatches, 1360 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6309 ImplicationChecksByTransitivity, 28.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=219occurred in iteration=61, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 1.1s AutomataMinimizationTime, 66 MinimizatonAttempts, 2717 StatesRemovedByMinimization, 63 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 1.3s SsaConstructionTime, 6.1s SatisfiabilityAnalysisTime, 254.7s InterpolantComputationTime, 25288 NumberOfCodeBlocks, 22168 NumberOfCodeBlocksAsserted, 229 NumberOfCheckSat, 49493 ConstructedInterpolants, 0 QuantifiedInterpolants, 28826872 SizeOfPredicates, 448 NumberOfNonLiveVariables, 50140 ConjunctsInSsa, 900 ConjunctsInUnsatCore, 130 InterpolantComputations, 2 PerfectInterpolantSequences, 574478/631758 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 incorrect! Received shutdown request...