/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 DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 20:28:22,907 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 20:28:22,923 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 20:28:22,924 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 20:28:22,926 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 20:28:22,928 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 20:28:22,930 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 20:28:22,931 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 20:28:22,932 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 20:28:22,933 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 20:28:22,934 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 20:28:22,935 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 20:28:22,936 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 20:28:22,937 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 20:28:22,938 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 20:28:22,939 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 20:28:22,941 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 20:28:22,943 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 20:28:22,945 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 20:28:22,946 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 20:28:22,947 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 20:28:22,948 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 20:28:22,951 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 20:28:22,959 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 20:28:22,960 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 20:28:22,961 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 20:28:22,962 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 20:28:22,979 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 20:28:22,979 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 20:28:22,981 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 20:28:22,981 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 20:28:22,981 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 20:28:22,981 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 20:28:22,982 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 20:28:22,982 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 20:28:22,982 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 20:28:22,982 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 20:28:22,982 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 20:28:22,982 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 20:28:22,983 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 20:28:22,983 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 20:28:22,983 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 20:28:22,983 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 20:28:22,983 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 20:28:22,984 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 20:28:22,984 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 20:28:22,984 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 20:28:22,984 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 20:28:22,984 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 20:28:22,984 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 20:28:22,985 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 20:28:22,985 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 20:28:22,985 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 20:28:22,985 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:22,985 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 20:28:22,986 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 20:28:22,986 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 -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 20:28:23,280 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 20:28:23,294 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 20:28:23,297 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 20:28:23,299 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 20:28:23,299 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 20:28:23,300 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-21 20:28:23,375 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/505a084d7/021801fac38447dd894bc1d86ca7856e/FLAG2b25237f7 [2020-07-21 20:28:23,808 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 20:28:23,809 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-21 20:28:23,816 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/505a084d7/021801fac38447dd894bc1d86ca7856e/FLAG2b25237f7 [2020-07-21 20:28:24,158 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/505a084d7/021801fac38447dd894bc1d86ca7856e [2020-07-21 20:28:24,167 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 20:28:24,170 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 20:28:24,171 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 20:28:24,171 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 20:28:24,175 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 20:28:24,176 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:28:24" (1/1) ... [2020-07-21 20:28:24,179 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ad94998 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:28:24, skipping insertion in model container [2020-07-21 20:28:24,180 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:28:24" (1/1) ... [2020-07-21 20:28:24,188 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 20:28:24,208 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 20:28:24,392 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:28:24,397 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 20:28:24,417 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:28:24,433 INFO L208 MainTranslator]: Completed translation [2020-07-21 20:28:24,433 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:28:24 WrapperNode [2020-07-21 20:28:24,433 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 20:28:24,434 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 20:28:24,434 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 20:28:24,435 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 20:28:24,449 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:28:24" (1/1) ... [2020-07-21 20:28:24,449 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:28:24" (1/1) ... [2020-07-21 20:28:24,455 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:28:24" (1/1) ... [2020-07-21 20:28:24,455 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:28:24" (1/1) ... [2020-07-21 20:28:24,459 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:28:24" (1/1) ... [2020-07-21 20:28:24,465 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:28:24" (1/1) ... [2020-07-21 20:28:24,467 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:28:24" (1/1) ... [2020-07-21 20:28:24,468 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 20:28:24,469 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 20:28:24,469 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 20:28:24,469 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 20:28:24,470 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:28:24" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 20:28:24,626 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 20:28:24,626 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 20:28:24,626 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 20:28:24,627 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 20:28:24,627 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 20:28:24,627 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 20:28:24,627 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 20:28:24,627 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 20:28:24,627 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 20:28:24,628 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 20:28:24,628 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 20:28:24,628 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 20:28:24,628 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 20:28:24,840 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 20:28:24,840 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 20:28:24,844 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:28:24 BoogieIcfgContainer [2020-07-21 20:28:24,845 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 20:28:24,846 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 20:28:24,846 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 20:28:24,849 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 20:28:24,849 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 08:28:24" (1/3) ... [2020-07-21 20:28:24,850 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@160498e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:28:24, skipping insertion in model container [2020-07-21 20:28:24,850 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:28:24" (2/3) ... [2020-07-21 20:28:24,851 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@160498e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:28:24, skipping insertion in model container [2020-07-21 20:28:24,851 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:28:24" (3/3) ... [2020-07-21 20:28:24,852 INFO L109 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2020-07-21 20:28:24,863 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 20:28:24,871 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 20:28:24,886 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 20:28:24,935 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 20:28:24,935 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 20:28:24,935 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 20:28:24,936 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 20:28:24,936 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 20:28:24,936 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 20:28:24,937 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 20:28:24,937 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 20:28:24,964 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-21 20:28:24,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 20:28:24,972 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:24,973 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:24,974 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:24,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:24,980 INFO L82 PathProgramCache]: Analyzing trace with hash 317368997, now seen corresponding path program 1 times [2020-07-21 20:28:24,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:24,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [821496085] [2020-07-21 20:28:24,991 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:25,063 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:28:25,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:25,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 20:28:25,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:25,139 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:28:25,181 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:28:25,182 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:28:25,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [821496085] [2020-07-21 20:28:25,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:28:25,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 20:28:25,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796907460] [2020-07-21 20:28:25,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 20:28:25,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:25,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 20:28:25,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 20:28:25,204 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 5 states. [2020-07-21 20:28:25,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:25,291 INFO L93 Difference]: Finished difference Result 54 states and 73 transitions. [2020-07-21 20:28:25,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 20:28:25,293 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-07-21 20:28:25,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:25,300 INFO L225 Difference]: With dead ends: 54 [2020-07-21 20:28:25,300 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 20:28:25,304 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 20:28:25,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 20:28:25,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2020-07-21 20:28:25,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 20:28:25,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-07-21 20:28:25,346 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 15 [2020-07-21 20:28:25,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:25,346 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-07-21 20:28:25,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 20:28:25,346 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-07-21 20:28:25,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 20:28:25,348 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:25,348 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] [2020-07-21 20:28:25,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:25,550 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:25,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:25,551 INFO L82 PathProgramCache]: Analyzing trace with hash -1401298672, now seen corresponding path program 1 times [2020-07-21 20:28:25,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:25,553 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [66641700] [2020-07-21 20:28:25,553 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:25,590 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:28:25,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:25,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 20:28:25,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:25,663 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:28:25,663 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:28:25,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [66641700] [2020-07-21 20:28:25,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:28:25,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 20:28:25,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94410716] [2020-07-21 20:28:25,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 20:28:25,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:25,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 20:28:25,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-21 20:28:25,671 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 5 states. [2020-07-21 20:28:25,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:25,766 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2020-07-21 20:28:25,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 20:28:25,767 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2020-07-21 20:28:25,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:25,771 INFO L225 Difference]: With dead ends: 49 [2020-07-21 20:28:25,772 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 20:28:25,773 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-21 20:28:25,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 20:28:25,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2020-07-21 20:28:25,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 20:28:25,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2020-07-21 20:28:25,785 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 25 [2020-07-21 20:28:25,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:25,786 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2020-07-21 20:28:25,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 20:28:25,786 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2020-07-21 20:28:25,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 20:28:25,787 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:25,787 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:26,000 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:26,001 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:26,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:26,002 INFO L82 PathProgramCache]: Analyzing trace with hash 1107622837, now seen corresponding path program 1 times [2020-07-21 20:28:26,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:26,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [540849506] [2020-07-21 20:28:26,004 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:26,081 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:26,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:26,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 20:28:26,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:26,163 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:28:26,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:26,235 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:28:26,236 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [540849506] [2020-07-21 20:28:26,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:26,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-21 20:28:26,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167605165] [2020-07-21 20:28:26,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 20:28:26,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:26,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 20:28:26,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 20:28:26,243 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 8 states. [2020-07-21 20:28:26,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:26,409 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2020-07-21 20:28:26,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 20:28:26,409 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-21 20:28:26,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:26,411 INFO L225 Difference]: With dead ends: 55 [2020-07-21 20:28:26,411 INFO L226 Difference]: Without dead ends: 40 [2020-07-21 20:28:26,412 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-21 20:28:26,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-21 20:28:26,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2020-07-21 20:28:26,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 20:28:26,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-21 20:28:26,422 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 27 [2020-07-21 20:28:26,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:26,422 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-21 20:28:26,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 20:28:26,423 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-21 20:28:26,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 20:28:26,424 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:26,424 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:26,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:26,638 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:26,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:26,639 INFO L82 PathProgramCache]: Analyzing trace with hash -1590427366, now seen corresponding path program 2 times [2020-07-21 20:28:26,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:26,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [742183551] [2020-07-21 20:28:26,640 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:26,681 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:26,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:26,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 20:28:26,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:26,716 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:28:26,733 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:28:26,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:26,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:28:26,792 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:28:26,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [742183551] [2020-07-21 20:28:26,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:26,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-07-21 20:28:26,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473157033] [2020-07-21 20:28:26,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 20:28:26,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:26,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 20:28:26,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 20:28:26,795 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 8 states. [2020-07-21 20:28:26,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:26,853 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2020-07-21 20:28:26,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 20:28:26,854 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-21 20:28:26,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:26,855 INFO L225 Difference]: With dead ends: 51 [2020-07-21 20:28:26,856 INFO L226 Difference]: Without dead ends: 49 [2020-07-21 20:28:26,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 20:28:26,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-21 20:28:26,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 44. [2020-07-21 20:28:26,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 20:28:26,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-07-21 20:28:26,865 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 29 [2020-07-21 20:28:26,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:26,866 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-07-21 20:28:26,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 20:28:26,866 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-07-21 20:28:26,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-21 20:28:26,869 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:26,869 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:27,083 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:27,083 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:27,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:27,084 INFO L82 PathProgramCache]: Analyzing trace with hash -30298372, now seen corresponding path program 3 times [2020-07-21 20:28:27,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:27,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838740957] [2020-07-21 20:28:27,086 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:27,130 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:27,130 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:27,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 20:28:27,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:27,197 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 28 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-21 20:28:27,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:27,256 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-07-21 20:28:27,257 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838740957] [2020-07-21 20:28:27,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:27,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-21 20:28:27,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22508398] [2020-07-21 20:28:27,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 20:28:27,259 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:27,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 20:28:27,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-07-21 20:28:27,260 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 11 states. [2020-07-21 20:28:27,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:27,383 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2020-07-21 20:28:27,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 20:28:27,384 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 45 [2020-07-21 20:28:27,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:27,386 INFO L225 Difference]: With dead ends: 83 [2020-07-21 20:28:27,387 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 20:28:27,388 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-07-21 20:28:27,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 20:28:27,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 46. [2020-07-21 20:28:27,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 20:28:27,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-07-21 20:28:27,397 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 45 [2020-07-21 20:28:27,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:27,397 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-07-21 20:28:27,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 20:28:27,398 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-07-21 20:28:27,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-07-21 20:28:27,399 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:27,399 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:27,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:27,614 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:27,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:27,615 INFO L82 PathProgramCache]: Analyzing trace with hash 130155809, now seen corresponding path program 4 times [2020-07-21 20:28:27,616 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:27,617 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1434593556] [2020-07-21 20:28:27,617 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:27,666 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:27,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:27,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 20:28:27,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:27,778 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 20:28:27,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:27,867 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 20:28:27,868 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1434593556] [2020-07-21 20:28:27,868 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:27,868 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-21 20:28:27,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480863020] [2020-07-21 20:28:27,869 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 20:28:27,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:27,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 20:28:27,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2020-07-21 20:28:27,871 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 14 states. [2020-07-21 20:28:28,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:28,058 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2020-07-21 20:28:28,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 20:28:28,059 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 47 [2020-07-21 20:28:28,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:28,060 INFO L225 Difference]: With dead ends: 87 [2020-07-21 20:28:28,060 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 20:28:28,061 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 77 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2020-07-21 20:28:28,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 20:28:28,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 48. [2020-07-21 20:28:28,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 20:28:28,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2020-07-21 20:28:28,070 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 47 [2020-07-21 20:28:28,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:28,070 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2020-07-21 20:28:28,070 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 20:28:28,070 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2020-07-21 20:28:28,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 20:28:28,071 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:28,072 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:28,272 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:28,273 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:28,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:28,273 INFO L82 PathProgramCache]: Analyzing trace with hash -292198906, now seen corresponding path program 5 times [2020-07-21 20:28:28,273 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:28,274 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1594989894] [2020-07-21 20:28:28,274 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:28,328 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:28,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:28,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 20:28:28,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:28,393 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:28:28,420 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 20:28:28,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:28,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:28:28,505 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 20:28:28,505 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1594989894] [2020-07-21 20:28:28,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:28,506 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-07-21 20:28:28,506 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029268491] [2020-07-21 20:28:28,507 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 20:28:28,507 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:28,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 20:28:28,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-07-21 20:28:28,508 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 10 states. [2020-07-21 20:28:28,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:28,599 INFO L93 Difference]: Finished difference Result 67 states and 73 transitions. [2020-07-21 20:28:28,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 20:28:28,600 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 49 [2020-07-21 20:28:28,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:28,602 INFO L225 Difference]: With dead ends: 67 [2020-07-21 20:28:28,603 INFO L226 Difference]: Without dead ends: 65 [2020-07-21 20:28:28,603 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 81 SyntacticMatches, 8 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 20:28:28,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-21 20:28:28,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2020-07-21 20:28:28,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 20:28:28,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2020-07-21 20:28:28,612 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 49 [2020-07-21 20:28:28,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:28,613 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2020-07-21 20:28:28,613 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 20:28:28,613 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2020-07-21 20:28:28,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 20:28:28,614 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:28,615 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:28,818 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:28,818 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:28,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:28,819 INFO L82 PathProgramCache]: Analyzing trace with hash 551795688, now seen corresponding path program 6 times [2020-07-21 20:28:28,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:28,820 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1964144982] [2020-07-21 20:28:28,820 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:28,863 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:28,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:28,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 20:28:28,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:28,995 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 72 proven. 20 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 20:28:28,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:29,118 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 58 proven. 20 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-07-21 20:28:29,118 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1964144982] [2020-07-21 20:28:29,119 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:29,119 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-21 20:28:29,119 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289565302] [2020-07-21 20:28:29,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 20:28:29,120 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:29,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 20:28:29,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2020-07-21 20:28:29,121 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand 17 states. [2020-07-21 20:28:29,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:29,303 INFO L93 Difference]: Finished difference Result 115 states and 135 transitions. [2020-07-21 20:28:29,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 20:28:29,303 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 65 [2020-07-21 20:28:29,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:29,305 INFO L225 Difference]: With dead ends: 115 [2020-07-21 20:28:29,305 INFO L226 Difference]: Without dead ends: 82 [2020-07-21 20:28:29,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 109 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2020-07-21 20:28:29,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-21 20:28:29,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 62. [2020-07-21 20:28:29,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-21 20:28:29,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2020-07-21 20:28:29,314 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 65 [2020-07-21 20:28:29,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:29,315 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2020-07-21 20:28:29,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 20:28:29,315 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2020-07-21 20:28:29,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 20:28:29,316 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:29,317 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:29,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:29,530 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:29,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:29,531 INFO L82 PathProgramCache]: Analyzing trace with hash -150434419, now seen corresponding path program 7 times [2020-07-21 20:28:29,531 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:29,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1267484007] [2020-07-21 20:28:29,532 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:29,578 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:29,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:29,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 20:28:29,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:29,726 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 20:28:29,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:29,858 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 20:28:29,858 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1267484007] [2020-07-21 20:28:29,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:29,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 20 [2020-07-21 20:28:29,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924521395] [2020-07-21 20:28:29,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 20:28:29,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:29,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 20:28:29,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2020-07-21 20:28:29,861 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand 20 states. [2020-07-21 20:28:30,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:30,090 INFO L93 Difference]: Finished difference Result 119 states and 142 transitions. [2020-07-21 20:28:30,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 20:28:30,091 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2020-07-21 20:28:30,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:30,093 INFO L225 Difference]: With dead ends: 119 [2020-07-21 20:28:30,093 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 20:28:30,094 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 109 SyntacticMatches, 6 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2020-07-21 20:28:30,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 20:28:30,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 64. [2020-07-21 20:28:30,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 20:28:30,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2020-07-21 20:28:30,102 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 67 [2020-07-21 20:28:30,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:30,102 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2020-07-21 20:28:30,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 20:28:30,103 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2020-07-21 20:28:30,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-21 20:28:30,104 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:30,104 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:30,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:30,318 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:30,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:30,319 INFO L82 PathProgramCache]: Analyzing trace with hash -683701774, now seen corresponding path program 8 times [2020-07-21 20:28:30,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:30,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1247687096] [2020-07-21 20:28:30,320 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:30,363 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:30,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:30,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 20:28:30,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:30,442 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:28:30,463 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 20:28:30,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:30,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:28:30,571 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 20:28:30,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1247687096] [2020-07-21 20:28:30,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:30,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-07-21 20:28:30,572 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576854134] [2020-07-21 20:28:30,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 20:28:30,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:30,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 20:28:30,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-07-21 20:28:30,574 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand 12 states. [2020-07-21 20:28:30,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:30,675 INFO L93 Difference]: Finished difference Result 83 states and 90 transitions. [2020-07-21 20:28:30,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 20:28:30,675 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 69 [2020-07-21 20:28:30,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:30,677 INFO L225 Difference]: With dead ends: 83 [2020-07-21 20:28:30,677 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 20:28:30,677 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 115 SyntacticMatches, 12 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2020-07-21 20:28:30,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 20:28:30,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 76. [2020-07-21 20:28:30,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 20:28:30,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2020-07-21 20:28:30,686 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 69 [2020-07-21 20:28:30,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:30,687 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2020-07-21 20:28:30,687 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 20:28:30,687 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2020-07-21 20:28:30,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-21 20:28:30,689 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:30,689 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:30,903 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:30,904 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:30,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:30,905 INFO L82 PathProgramCache]: Analyzing trace with hash 192972756, now seen corresponding path program 9 times [2020-07-21 20:28:30,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:30,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1403313078] [2020-07-21 20:28:30,905 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:30,965 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:30,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:30,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 20:28:30,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:31,113 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 132 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-21 20:28:31,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:31,313 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 110 proven. 42 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2020-07-21 20:28:31,314 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1403313078] [2020-07-21 20:28:31,314 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:31,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 23 [2020-07-21 20:28:31,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615188344] [2020-07-21 20:28:31,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 20:28:31,315 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:31,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 20:28:31,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 20:28:31,317 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 23 states. [2020-07-21 20:28:31,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:31,562 INFO L93 Difference]: Finished difference Result 147 states and 174 transitions. [2020-07-21 20:28:31,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 20:28:31,563 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 85 [2020-07-21 20:28:31,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:31,565 INFO L225 Difference]: With dead ends: 147 [2020-07-21 20:28:31,565 INFO L226 Difference]: Without dead ends: 106 [2020-07-21 20:28:31,566 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 141 SyntacticMatches, 7 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2020-07-21 20:28:31,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-21 20:28:31,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 78. [2020-07-21 20:28:31,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-21 20:28:31,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2020-07-21 20:28:31,575 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 85 [2020-07-21 20:28:31,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:31,576 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2020-07-21 20:28:31,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 20:28:31,576 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2020-07-21 20:28:31,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-07-21 20:28:31,577 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:31,577 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:31,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:31,793 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:31,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:31,794 INFO L82 PathProgramCache]: Analyzing trace with hash 1722356985, now seen corresponding path program 10 times [2020-07-21 20:28:31,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:31,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [669064280] [2020-07-21 20:28:31,795 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:31,840 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:31,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:31,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 20:28:31,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:32,059 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 20:28:32,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:32,270 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 20:28:32,271 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [669064280] [2020-07-21 20:28:32,271 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:32,271 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 26 [2020-07-21 20:28:32,272 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882908345] [2020-07-21 20:28:32,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 20:28:32,273 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:32,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 20:28:32,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2020-07-21 20:28:32,274 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 26 states. [2020-07-21 20:28:32,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:32,602 INFO L93 Difference]: Finished difference Result 151 states and 181 transitions. [2020-07-21 20:28:32,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 20:28:32,603 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 87 [2020-07-21 20:28:32,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:32,604 INFO L225 Difference]: With dead ends: 151 [2020-07-21 20:28:32,605 INFO L226 Difference]: Without dead ends: 112 [2020-07-21 20:28:32,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 141 SyntacticMatches, 8 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 20:28:32,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-21 20:28:32,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 80. [2020-07-21 20:28:32,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 20:28:32,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2020-07-21 20:28:32,614 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 87 [2020-07-21 20:28:32,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:32,614 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2020-07-21 20:28:32,615 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 20:28:32,615 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2020-07-21 20:28:32,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-07-21 20:28:32,616 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:32,616 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:32,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:32,832 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:32,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:32,833 INFO L82 PathProgramCache]: Analyzing trace with hash -1713181474, now seen corresponding path program 11 times [2020-07-21 20:28:32,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:32,834 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [257907640] [2020-07-21 20:28:32,834 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:32,889 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:32,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:32,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 20:28:32,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:32,973 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:28:32,999 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 20:28:33,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:33,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:28:33,152 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 20:28:33,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [257907640] [2020-07-21 20:28:33,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:33,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-07-21 20:28:33,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286539547] [2020-07-21 20:28:33,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 20:28:33,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:33,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 20:28:33,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-07-21 20:28:33,157 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 14 states. [2020-07-21 20:28:33,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:33,288 INFO L93 Difference]: Finished difference Result 99 states and 107 transitions. [2020-07-21 20:28:33,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 20:28:33,288 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 89 [2020-07-21 20:28:33,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:33,290 INFO L225 Difference]: With dead ends: 99 [2020-07-21 20:28:33,290 INFO L226 Difference]: Without dead ends: 97 [2020-07-21 20:28:33,291 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 149 SyntacticMatches, 16 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2020-07-21 20:28:33,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-21 20:28:33,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 92. [2020-07-21 20:28:33,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-21 20:28:33,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions. [2020-07-21 20:28:33,298 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 89 [2020-07-21 20:28:33,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:33,298 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 99 transitions. [2020-07-21 20:28:33,298 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 20:28:33,299 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions. [2020-07-21 20:28:33,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-07-21 20:28:33,300 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:33,300 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:33,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:33,515 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:33,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:33,516 INFO L82 PathProgramCache]: Analyzing trace with hash -1950838080, now seen corresponding path program 12 times [2020-07-21 20:28:33,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:33,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [148933687] [2020-07-21 20:28:33,517 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:33,576 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:33,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:33,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 20:28:33,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:33,827 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 208 proven. 72 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-21 20:28:33,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:34,065 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 178 proven. 72 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2020-07-21 20:28:34,065 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [148933687] [2020-07-21 20:28:34,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:34,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 29 [2020-07-21 20:28:34,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562456232] [2020-07-21 20:28:34,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 20:28:34,067 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:34,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 20:28:34,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2020-07-21 20:28:34,068 INFO L87 Difference]: Start difference. First operand 92 states and 99 transitions. Second operand 29 states. [2020-07-21 20:28:34,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:34,457 INFO L93 Difference]: Finished difference Result 179 states and 213 transitions. [2020-07-21 20:28:34,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 20:28:34,458 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 105 [2020-07-21 20:28:34,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:34,459 INFO L225 Difference]: With dead ends: 179 [2020-07-21 20:28:34,459 INFO L226 Difference]: Without dead ends: 130 [2020-07-21 20:28:34,460 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 173 SyntacticMatches, 9 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 20:28:34,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-07-21 20:28:34,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 94. [2020-07-21 20:28:34,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-21 20:28:34,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 101 transitions. [2020-07-21 20:28:34,467 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 101 transitions. Word has length 105 [2020-07-21 20:28:34,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:34,468 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 101 transitions. [2020-07-21 20:28:34,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 20:28:34,468 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 101 transitions. [2020-07-21 20:28:34,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-21 20:28:34,469 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:34,469 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:34,682 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:34,683 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:34,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:34,684 INFO L82 PathProgramCache]: Analyzing trace with hash -734782619, now seen corresponding path program 13 times [2020-07-21 20:28:34,684 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:34,684 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998953745] [2020-07-21 20:28:34,685 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:34,741 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:34,742 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:34,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 20:28:34,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:35,012 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 20:28:35,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:35,297 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 20:28:35,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [998953745] [2020-07-21 20:28:35,298 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:35,298 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 32 [2020-07-21 20:28:35,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420717105] [2020-07-21 20:28:35,299 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 20:28:35,299 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:35,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 20:28:35,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2020-07-21 20:28:35,300 INFO L87 Difference]: Start difference. First operand 94 states and 101 transitions. Second operand 32 states. [2020-07-21 20:28:35,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:35,767 INFO L93 Difference]: Finished difference Result 183 states and 220 transitions. [2020-07-21 20:28:35,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 20:28:35,768 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 107 [2020-07-21 20:28:35,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:35,769 INFO L225 Difference]: With dead ends: 183 [2020-07-21 20:28:35,770 INFO L226 Difference]: Without dead ends: 136 [2020-07-21 20:28:35,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 173 SyntacticMatches, 10 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 396 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 20:28:35,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-21 20:28:35,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 96. [2020-07-21 20:28:35,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-21 20:28:35,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2020-07-21 20:28:35,778 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 107 [2020-07-21 20:28:35,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:35,779 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2020-07-21 20:28:35,779 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 20:28:35,779 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2020-07-21 20:28:35,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 20:28:35,780 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:35,780 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:35,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:35,995 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:35,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:35,996 INFO L82 PathProgramCache]: Analyzing trace with hash -336589110, now seen corresponding path program 14 times [2020-07-21 20:28:35,996 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:35,996 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [390942004] [2020-07-21 20:28:35,997 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:36,047 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:36,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:36,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 20:28:36,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:36,140 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:28:36,170 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 20:28:36,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:36,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:28:36,364 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 20:28:36,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [390942004] [2020-07-21 20:28:36,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:36,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-07-21 20:28:36,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755399955] [2020-07-21 20:28:36,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 20:28:36,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:36,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 20:28:36,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-07-21 20:28:36,370 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 16 states. [2020-07-21 20:28:36,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:36,524 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2020-07-21 20:28:36,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 20:28:36,525 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2020-07-21 20:28:36,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:36,527 INFO L225 Difference]: With dead ends: 115 [2020-07-21 20:28:36,527 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 20:28:36,528 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 183 SyntacticMatches, 20 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=99, Invalid=173, Unknown=0, NotChecked=0, Total=272 [2020-07-21 20:28:36,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 20:28:36,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 108. [2020-07-21 20:28:36,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-21 20:28:36,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 116 transitions. [2020-07-21 20:28:36,536 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 116 transitions. Word has length 109 [2020-07-21 20:28:36,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:36,536 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 116 transitions. [2020-07-21 20:28:36,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 20:28:36,537 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 116 transitions. [2020-07-21 20:28:36,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-21 20:28:36,538 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:36,538 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:36,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:36,753 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:36,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:36,754 INFO L82 PathProgramCache]: Analyzing trace with hash 1711037612, now seen corresponding path program 15 times [2020-07-21 20:28:36,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:36,754 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1218836105] [2020-07-21 20:28:36,755 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:36,816 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:36,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:36,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 20:28:36,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:37,089 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 300 proven. 110 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-21 20:28:37,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:37,421 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 262 proven. 110 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-21 20:28:37,424 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1218836105] [2020-07-21 20:28:37,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:37,429 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 35 [2020-07-21 20:28:37,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999922622] [2020-07-21 20:28:37,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 20:28:37,432 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:37,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 20:28:37,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=892, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 20:28:37,433 INFO L87 Difference]: Start difference. First operand 108 states and 116 transitions. Second operand 35 states. [2020-07-21 20:28:37,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:37,915 INFO L93 Difference]: Finished difference Result 211 states and 252 transitions. [2020-07-21 20:28:37,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 20:28:37,915 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 125 [2020-07-21 20:28:37,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:37,917 INFO L225 Difference]: With dead ends: 211 [2020-07-21 20:28:37,917 INFO L226 Difference]: Without dead ends: 154 [2020-07-21 20:28:37,918 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 205 SyntacticMatches, 11 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 20:28:37,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-21 20:28:37,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 110. [2020-07-21 20:28:37,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 20:28:37,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 118 transitions. [2020-07-21 20:28:37,925 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 118 transitions. Word has length 125 [2020-07-21 20:28:37,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:37,926 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 118 transitions. [2020-07-21 20:28:37,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 20:28:37,926 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 118 transitions. [2020-07-21 20:28:37,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-21 20:28:37,927 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:37,927 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:38,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:38,141 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:38,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:38,142 INFO L82 PathProgramCache]: Analyzing trace with hash 66724049, now seen corresponding path program 16 times [2020-07-21 20:28:38,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:38,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [556374173] [2020-07-21 20:28:38,143 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:38,202 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:38,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:38,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 20:28:38,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:38,568 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 20:28:38,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:38,958 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 20:28:38,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [556374173] [2020-07-21 20:28:38,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:38,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 38 [2020-07-21 20:28:38,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464263117] [2020-07-21 20:28:38,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 20:28:38,959 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:38,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 20:28:38,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 20:28:38,961 INFO L87 Difference]: Start difference. First operand 110 states and 118 transitions. Second operand 38 states. [2020-07-21 20:28:39,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:39,527 INFO L93 Difference]: Finished difference Result 215 states and 259 transitions. [2020-07-21 20:28:39,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 20:28:39,528 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 127 [2020-07-21 20:28:39,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:39,529 INFO L225 Difference]: With dead ends: 215 [2020-07-21 20:28:39,530 INFO L226 Difference]: Without dead ends: 160 [2020-07-21 20:28:39,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 205 SyntacticMatches, 12 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 583 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=673, Invalid=1777, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 20:28:39,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-07-21 20:28:39,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 112. [2020-07-21 20:28:39,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-21 20:28:39,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions. [2020-07-21 20:28:39,538 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 127 [2020-07-21 20:28:39,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:39,539 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 120 transitions. [2020-07-21 20:28:39,539 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 20:28:39,539 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions. [2020-07-21 20:28:39,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-07-21 20:28:39,540 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:39,540 INFO L422 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:39,755 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:39,756 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:39,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:39,757 INFO L82 PathProgramCache]: Analyzing trace with hash 429354934, now seen corresponding path program 17 times [2020-07-21 20:28:39,757 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:39,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [21308296] [2020-07-21 20:28:39,757 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:39,817 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:39,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:39,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 20:28:39,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:39,942 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:28:39,973 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 20:28:39,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:39,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:28:40,225 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 20:28:40,225 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [21308296] [2020-07-21 20:28:40,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:40,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-07-21 20:28:40,226 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347356193] [2020-07-21 20:28:40,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 20:28:40,229 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:40,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 20:28:40,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-07-21 20:28:40,229 INFO L87 Difference]: Start difference. First operand 112 states and 120 transitions. Second operand 18 states. [2020-07-21 20:28:40,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:40,380 INFO L93 Difference]: Finished difference Result 131 states and 141 transitions. [2020-07-21 20:28:40,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 20:28:40,382 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 129 [2020-07-21 20:28:40,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:40,383 INFO L225 Difference]: With dead ends: 131 [2020-07-21 20:28:40,383 INFO L226 Difference]: Without dead ends: 129 [2020-07-21 20:28:40,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 217 SyntacticMatches, 24 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=128, Invalid=214, Unknown=0, NotChecked=0, Total=342 [2020-07-21 20:28:40,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2020-07-21 20:28:40,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 124. [2020-07-21 20:28:40,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-21 20:28:40,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 133 transitions. [2020-07-21 20:28:40,392 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 133 transitions. Word has length 129 [2020-07-21 20:28:40,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:40,393 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 133 transitions. [2020-07-21 20:28:40,393 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 20:28:40,393 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 133 transitions. [2020-07-21 20:28:40,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-21 20:28:40,394 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:40,394 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:40,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:40,608 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:40,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:40,609 INFO L82 PathProgramCache]: Analyzing trace with hash 1971086744, now seen corresponding path program 18 times [2020-07-21 20:28:40,609 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:40,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1771048309] [2020-07-21 20:28:40,609 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:40,673 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:40,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:40,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 20:28:40,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:41,097 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 408 proven. 156 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-21 20:28:41,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:41,597 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 362 proven. 156 refuted. 0 times theorem prover too weak. 314 trivial. 0 not checked. [2020-07-21 20:28:41,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1771048309] [2020-07-21 20:28:41,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:41,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 41 [2020-07-21 20:28:41,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568734944] [2020-07-21 20:28:41,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-21 20:28:41,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:41,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-21 20:28:41,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 20:28:41,601 INFO L87 Difference]: Start difference. First operand 124 states and 133 transitions. Second operand 41 states. [2020-07-21 20:28:42,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:42,251 INFO L93 Difference]: Finished difference Result 243 states and 291 transitions. [2020-07-21 20:28:42,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 20:28:42,252 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 145 [2020-07-21 20:28:42,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:42,253 INFO L225 Difference]: With dead ends: 243 [2020-07-21 20:28:42,253 INFO L226 Difference]: Without dead ends: 178 [2020-07-21 20:28:42,255 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 237 SyntacticMatches, 13 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=781, Invalid=2081, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 20:28:42,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-21 20:28:42,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 126. [2020-07-21 20:28:42,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-07-21 20:28:42,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 135 transitions. [2020-07-21 20:28:42,262 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 135 transitions. Word has length 145 [2020-07-21 20:28:42,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:42,263 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 135 transitions. [2020-07-21 20:28:42,263 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-21 20:28:42,263 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 135 transitions. [2020-07-21 20:28:42,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2020-07-21 20:28:42,264 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:42,264 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:42,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:42,473 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:42,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:42,474 INFO L82 PathProgramCache]: Analyzing trace with hash 554411325, now seen corresponding path program 19 times [2020-07-21 20:28:42,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:42,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [177607247] [2020-07-21 20:28:42,474 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:42,544 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:42,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:42,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 20:28:42,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:42,996 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 20:28:42,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:43,576 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 20:28:43,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [177607247] [2020-07-21 20:28:43,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:43,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 44 [2020-07-21 20:28:43,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430226922] [2020-07-21 20:28:43,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 20:28:43,578 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:43,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 20:28:43,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 20:28:43,579 INFO L87 Difference]: Start difference. First operand 126 states and 135 transitions. Second operand 44 states. [2020-07-21 20:28:44,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:44,221 INFO L93 Difference]: Finished difference Result 247 states and 298 transitions. [2020-07-21 20:28:44,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 20:28:44,222 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 147 [2020-07-21 20:28:44,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:44,223 INFO L225 Difference]: With dead ends: 247 [2020-07-21 20:28:44,223 INFO L226 Difference]: Without dead ends: 184 [2020-07-21 20:28:44,225 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 237 SyntacticMatches, 14 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=897, Invalid=2409, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 20:28:44,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-07-21 20:28:44,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 128. [2020-07-21 20:28:44,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2020-07-21 20:28:44,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions. [2020-07-21 20:28:44,233 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 147 [2020-07-21 20:28:44,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:44,233 INFO L479 AbstractCegarLoop]: Abstraction has 128 states and 137 transitions. [2020-07-21 20:28:44,233 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 20:28:44,233 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions. [2020-07-21 20:28:44,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-21 20:28:44,234 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:44,234 INFO L422 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:44,441 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:44,442 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:44,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:44,443 INFO L82 PathProgramCache]: Analyzing trace with hash 633966498, now seen corresponding path program 20 times [2020-07-21 20:28:44,443 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:44,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [359617485] [2020-07-21 20:28:44,443 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:44,509 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:44,509 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:44,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-21 20:28:44,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:44,668 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:28:44,708 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 20:28:44,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:44,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:28:45,017 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 20:28:45,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [359617485] [2020-07-21 20:28:45,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:45,017 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-07-21 20:28:45,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445087315] [2020-07-21 20:28:45,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 20:28:45,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:45,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 20:28:45,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=223, Unknown=0, NotChecked=0, Total=380 [2020-07-21 20:28:45,018 INFO L87 Difference]: Start difference. First operand 128 states and 137 transitions. Second operand 20 states. [2020-07-21 20:28:45,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:45,223 INFO L93 Difference]: Finished difference Result 147 states and 158 transitions. [2020-07-21 20:28:45,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 20:28:45,226 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 149 [2020-07-21 20:28:45,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:45,227 INFO L225 Difference]: With dead ends: 147 [2020-07-21 20:28:45,227 INFO L226 Difference]: Without dead ends: 145 [2020-07-21 20:28:45,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 251 SyntacticMatches, 28 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=161, Invalid=259, Unknown=0, NotChecked=0, Total=420 [2020-07-21 20:28:45,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2020-07-21 20:28:45,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 140. [2020-07-21 20:28:45,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-21 20:28:45,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 150 transitions. [2020-07-21 20:28:45,236 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 150 transitions. Word has length 149 [2020-07-21 20:28:45,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:45,237 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 150 transitions. [2020-07-21 20:28:45,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 20:28:45,237 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 150 transitions. [2020-07-21 20:28:45,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2020-07-21 20:28:45,238 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:45,239 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:45,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:45,450 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:45,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:45,451 INFO L82 PathProgramCache]: Analyzing trace with hash -869716604, now seen corresponding path program 21 times [2020-07-21 20:28:45,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:45,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1195021563] [2020-07-21 20:28:45,452 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:45,525 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:45,525 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:45,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-21 20:28:45,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:46,044 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 532 proven. 210 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 20:28:46,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:46,717 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 478 proven. 210 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 20:28:46,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1195021563] [2020-07-21 20:28:46,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:46,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 47 [2020-07-21 20:28:46,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18078048] [2020-07-21 20:28:46,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-21 20:28:46,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:46,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-21 20:28:46,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 20:28:46,721 INFO L87 Difference]: Start difference. First operand 140 states and 150 transitions. Second operand 47 states. [2020-07-21 20:28:47,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:47,509 INFO L93 Difference]: Finished difference Result 275 states and 330 transitions. [2020-07-21 20:28:47,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 20:28:47,509 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 165 [2020-07-21 20:28:47,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:47,511 INFO L225 Difference]: With dead ends: 275 [2020-07-21 20:28:47,511 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 20:28:47,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 269 SyntacticMatches, 15 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1021, Invalid=2761, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 20:28:47,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 20:28:47,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 142. [2020-07-21 20:28:47,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-21 20:28:47,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 152 transitions. [2020-07-21 20:28:47,522 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 152 transitions. Word has length 165 [2020-07-21 20:28:47,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:47,522 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 152 transitions. [2020-07-21 20:28:47,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-21 20:28:47,522 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 152 transitions. [2020-07-21 20:28:47,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2020-07-21 20:28:47,523 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:47,524 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:47,737 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:47,738 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:47,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:47,739 INFO L82 PathProgramCache]: Analyzing trace with hash -583456599, now seen corresponding path program 22 times [2020-07-21 20:28:47,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:47,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126116536] [2020-07-21 20:28:47,740 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:47,811 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:47,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:47,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 34 conjunts are in the unsatisfiable core [2020-07-21 20:28:47,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:48,380 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 20:28:48,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:49,023 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 20:28:49,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126116536] [2020-07-21 20:28:49,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:49,024 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 50 [2020-07-21 20:28:49,024 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850627030] [2020-07-21 20:28:49,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 20:28:49,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:49,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 20:28:49,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 20:28:49,026 INFO L87 Difference]: Start difference. First operand 142 states and 152 transitions. Second operand 50 states. [2020-07-21 20:28:49,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:49,911 INFO L93 Difference]: Finished difference Result 279 states and 337 transitions. [2020-07-21 20:28:49,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 20:28:49,911 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 167 [2020-07-21 20:28:49,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:49,913 INFO L225 Difference]: With dead ends: 279 [2020-07-21 20:28:49,913 INFO L226 Difference]: Without dead ends: 208 [2020-07-21 20:28:49,914 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 269 SyntacticMatches, 16 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1065 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1153, Invalid=3137, Unknown=0, NotChecked=0, Total=4290 [2020-07-21 20:28:49,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-21 20:28:49,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 144. [2020-07-21 20:28:49,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 20:28:49,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 154 transitions. [2020-07-21 20:28:49,923 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 154 transitions. Word has length 167 [2020-07-21 20:28:49,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:49,923 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 154 transitions. [2020-07-21 20:28:49,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 20:28:49,923 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 154 transitions. [2020-07-21 20:28:49,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-07-21 20:28:49,924 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:49,924 INFO L422 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:50,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:50,138 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:50,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:50,139 INFO L82 PathProgramCache]: Analyzing trace with hash -365498738, now seen corresponding path program 23 times [2020-07-21 20:28:50,139 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:50,139 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1835980185] [2020-07-21 20:28:50,140 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:50,214 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:50,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:50,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 20:28:50,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:50,416 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:28:50,470 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 20:28:50,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:50,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:28:50,859 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 20:28:50,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1835980185] [2020-07-21 20:28:50,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:50,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-07-21 20:28:50,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450961764] [2020-07-21 20:28:50,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 20:28:50,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:50,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 20:28:50,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=268, Unknown=0, NotChecked=0, Total=462 [2020-07-21 20:28:50,861 INFO L87 Difference]: Start difference. First operand 144 states and 154 transitions. Second operand 22 states. [2020-07-21 20:28:51,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:51,079 INFO L93 Difference]: Finished difference Result 163 states and 175 transitions. [2020-07-21 20:28:51,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 20:28:51,080 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 169 [2020-07-21 20:28:51,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:51,082 INFO L225 Difference]: With dead ends: 163 [2020-07-21 20:28:51,082 INFO L226 Difference]: Without dead ends: 161 [2020-07-21 20:28:51,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 285 SyntacticMatches, 32 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=198, Invalid=308, Unknown=0, NotChecked=0, Total=506 [2020-07-21 20:28:51,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2020-07-21 20:28:51,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 156. [2020-07-21 20:28:51,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-21 20:28:51,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 167 transitions. [2020-07-21 20:28:51,092 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 167 transitions. Word has length 169 [2020-07-21 20:28:51,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:51,092 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 167 transitions. [2020-07-21 20:28:51,092 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 20:28:51,092 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 167 transitions. [2020-07-21 20:28:51,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2020-07-21 20:28:51,094 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:51,094 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:51,308 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:51,309 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:51,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:51,309 INFO L82 PathProgramCache]: Analyzing trace with hash -760007568, now seen corresponding path program 24 times [2020-07-21 20:28:51,310 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:51,310 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924282968] [2020-07-21 20:28:51,310 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:51,391 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:51,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:51,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 20:28:51,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:52,070 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 672 proven. 272 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-07-21 20:28:52,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:52,827 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 610 proven. 272 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2020-07-21 20:28:52,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924282968] [2020-07-21 20:28:52,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:52,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 53 [2020-07-21 20:28:52,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379418030] [2020-07-21 20:28:52,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-21 20:28:52,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:52,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-21 20:28:52,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 20:28:52,830 INFO L87 Difference]: Start difference. First operand 156 states and 167 transitions. Second operand 53 states. [2020-07-21 20:28:53,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:53,783 INFO L93 Difference]: Finished difference Result 307 states and 369 transitions. [2020-07-21 20:28:53,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 20:28:53,783 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 185 [2020-07-21 20:28:53,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:53,785 INFO L225 Difference]: With dead ends: 307 [2020-07-21 20:28:53,785 INFO L226 Difference]: Without dead ends: 226 [2020-07-21 20:28:53,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 301 SyntacticMatches, 17 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1208 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1293, Invalid=3537, Unknown=0, NotChecked=0, Total=4830 [2020-07-21 20:28:53,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-21 20:28:53,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 158. [2020-07-21 20:28:53,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-07-21 20:28:53,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 169 transitions. [2020-07-21 20:28:53,798 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 169 transitions. Word has length 185 [2020-07-21 20:28:53,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:53,799 INFO L479 AbstractCegarLoop]: Abstraction has 158 states and 169 transitions. [2020-07-21 20:28:53,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-21 20:28:53,799 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 169 transitions. [2020-07-21 20:28:53,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-21 20:28:53,800 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:53,800 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:54,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:54,015 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:54,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:54,017 INFO L82 PathProgramCache]: Analyzing trace with hash -1861014763, now seen corresponding path program 25 times [2020-07-21 20:28:54,018 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:54,018 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1464171430] [2020-07-21 20:28:54,018 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:54,098 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:54,099 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:54,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 38 conjunts are in the unsatisfiable core [2020-07-21 20:28:54,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:54,803 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 20:28:54,803 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:55,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 20:28:55,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1464171430] [2020-07-21 20:28:55,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:55,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 56 [2020-07-21 20:28:55,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952254252] [2020-07-21 20:28:55,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-21 20:28:55,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:55,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-21 20:28:55,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=2341, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 20:28:55,641 INFO L87 Difference]: Start difference. First operand 158 states and 169 transitions. Second operand 56 states. [2020-07-21 20:28:56,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:56,720 INFO L93 Difference]: Finished difference Result 311 states and 376 transitions. [2020-07-21 20:28:56,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 20:28:56,720 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 187 [2020-07-21 20:28:56,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:56,722 INFO L225 Difference]: With dead ends: 311 [2020-07-21 20:28:56,723 INFO L226 Difference]: Without dead ends: 232 [2020-07-21 20:28:56,725 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 301 SyntacticMatches, 18 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1360 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1441, Invalid=3961, Unknown=0, NotChecked=0, Total=5402 [2020-07-21 20:28:56,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-07-21 20:28:56,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 160. [2020-07-21 20:28:56,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-21 20:28:56,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 171 transitions. [2020-07-21 20:28:56,739 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 171 transitions. Word has length 187 [2020-07-21 20:28:56,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:56,740 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 171 transitions. [2020-07-21 20:28:56,740 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-21 20:28:56,740 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 171 transitions. [2020-07-21 20:28:56,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 20:28:56,743 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:56,743 INFO L422 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:56,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:56,957 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:56,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:56,957 INFO L82 PathProgramCache]: Analyzing trace with hash 927992954, now seen corresponding path program 26 times [2020-07-21 20:28:56,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:56,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1826746895] [2020-07-21 20:28:56,958 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:57,069 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:57,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:57,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-21 20:28:57,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:57,288 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:28:57,342 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 20:28:57,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:28:57,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:28:57,842 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 20:28:57,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1826746895] [2020-07-21 20:28:57,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:28:57,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-07-21 20:28:57,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004054898] [2020-07-21 20:28:57,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 20:28:57,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:28:57,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 20:28:57,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=317, Unknown=0, NotChecked=0, Total=552 [2020-07-21 20:28:57,844 INFO L87 Difference]: Start difference. First operand 160 states and 171 transitions. Second operand 24 states. [2020-07-21 20:28:58,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:28:58,040 INFO L93 Difference]: Finished difference Result 179 states and 192 transitions. [2020-07-21 20:28:58,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 20:28:58,041 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 189 [2020-07-21 20:28:58,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:28:58,042 INFO L225 Difference]: With dead ends: 179 [2020-07-21 20:28:58,042 INFO L226 Difference]: Without dead ends: 177 [2020-07-21 20:28:58,043 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 319 SyntacticMatches, 36 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=239, Invalid=361, Unknown=0, NotChecked=0, Total=600 [2020-07-21 20:28:58,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2020-07-21 20:28:58,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 172. [2020-07-21 20:28:58,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2020-07-21 20:28:58,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 184 transitions. [2020-07-21 20:28:58,054 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 184 transitions. Word has length 189 [2020-07-21 20:28:58,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:28:58,056 INFO L479 AbstractCegarLoop]: Abstraction has 172 states and 184 transitions. [2020-07-21 20:28:58,056 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 20:28:58,056 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 184 transitions. [2020-07-21 20:28:58,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-21 20:28:58,059 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:28:58,059 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 19, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:28:58,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:58,263 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:28:58,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:28:58,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1753938524, now seen corresponding path program 27 times [2020-07-21 20:28:58,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:28:58,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [606712270] [2020-07-21 20:28:58,264 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:28:58,352 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:28:58,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:28:58,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 40 conjunts are in the unsatisfiable core [2020-07-21 20:28:58,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:28:59,117 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 828 proven. 342 refuted. 0 times theorem prover too weak. 616 trivial. 0 not checked. [2020-07-21 20:28:59,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:29:00,018 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 758 proven. 342 refuted. 0 times theorem prover too weak. 686 trivial. 0 not checked. [2020-07-21 20:29:00,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [606712270] [2020-07-21 20:29:00,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:29:00,019 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 59 [2020-07-21 20:29:00,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932823782] [2020-07-21 20:29:00,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-21 20:29:00,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:29:00,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-21 20:29:00,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2020-07-21 20:29:00,020 INFO L87 Difference]: Start difference. First operand 172 states and 184 transitions. Second operand 59 states. [2020-07-21 20:29:01,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:29:01,192 INFO L93 Difference]: Finished difference Result 339 states and 408 transitions. [2020-07-21 20:29:01,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 20:29:01,192 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 205 [2020-07-21 20:29:01,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:29:01,193 INFO L225 Difference]: With dead ends: 339 [2020-07-21 20:29:01,194 INFO L226 Difference]: Without dead ends: 250 [2020-07-21 20:29:01,195 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 333 SyntacticMatches, 19 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1521 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1597, Invalid=4409, Unknown=0, NotChecked=0, Total=6006 [2020-07-21 20:29:01,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-21 20:29:01,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 174. [2020-07-21 20:29:01,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-21 20:29:01,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 186 transitions. [2020-07-21 20:29:01,204 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 186 transitions. Word has length 205 [2020-07-21 20:29:01,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:29:01,205 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 186 transitions. [2020-07-21 20:29:01,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-21 20:29:01,205 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 186 transitions. [2020-07-21 20:29:01,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2020-07-21 20:29:01,206 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:29:01,206 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:29:01,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:01,422 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:29:01,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:29:01,423 INFO L82 PathProgramCache]: Analyzing trace with hash 1542073473, now seen corresponding path program 28 times [2020-07-21 20:29:01,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:29:01,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1619374131] [2020-07-21 20:29:01,423 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:01,513 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:29:01,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:29:01,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 42 conjunts are in the unsatisfiable core [2020-07-21 20:29:01,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:29:02,439 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 20:29:02,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:29:03,482 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 20:29:03,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1619374131] [2020-07-21 20:29:03,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:29:03,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 62 [2020-07-21 20:29:03,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105576156] [2020-07-21 20:29:03,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-07-21 20:29:03,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:29:03,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-07-21 20:29:03,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=2881, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 20:29:03,487 INFO L87 Difference]: Start difference. First operand 174 states and 186 transitions. Second operand 62 states. [2020-07-21 20:29:04,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:29:04,804 INFO L93 Difference]: Finished difference Result 343 states and 415 transitions. [2020-07-21 20:29:04,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 20:29:04,804 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 207 [2020-07-21 20:29:04,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:29:04,806 INFO L225 Difference]: With dead ends: 343 [2020-07-21 20:29:04,806 INFO L226 Difference]: Without dead ends: 256 [2020-07-21 20:29:04,808 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 333 SyntacticMatches, 20 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1691 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1761, Invalid=4881, Unknown=0, NotChecked=0, Total=6642 [2020-07-21 20:29:04,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-07-21 20:29:04,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 176. [2020-07-21 20:29:04,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 20:29:04,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 188 transitions. [2020-07-21 20:29:04,819 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 188 transitions. Word has length 207 [2020-07-21 20:29:04,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:29:04,819 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 188 transitions. [2020-07-21 20:29:04,819 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-07-21 20:29:04,819 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 188 transitions. [2020-07-21 20:29:04,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2020-07-21 20:29:04,820 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:29:04,821 INFO L422 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:29:05,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:05,036 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:29:05,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:29:05,037 INFO L82 PathProgramCache]: Analyzing trace with hash -196777626, now seen corresponding path program 29 times [2020-07-21 20:29:05,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:29:05,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1702560832] [2020-07-21 20:29:05,037 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:05,125 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:29:05,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:29:05,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-21 20:29:05,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:29:05,414 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:29:05,467 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 20:29:05,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:29:05,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:29:06,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 20:29:06,085 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1702560832] [2020-07-21 20:29:06,085 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:29:06,085 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-07-21 20:29:06,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119916546] [2020-07-21 20:29:06,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 20:29:06,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:29:06,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 20:29:06,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=370, Unknown=0, NotChecked=0, Total=650 [2020-07-21 20:29:06,086 INFO L87 Difference]: Start difference. First operand 176 states and 188 transitions. Second operand 26 states. [2020-07-21 20:29:06,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:29:06,352 INFO L93 Difference]: Finished difference Result 195 states and 209 transitions. [2020-07-21 20:29:06,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 20:29:06,353 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 209 [2020-07-21 20:29:06,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:29:06,356 INFO L225 Difference]: With dead ends: 195 [2020-07-21 20:29:06,356 INFO L226 Difference]: Without dead ends: 193 [2020-07-21 20:29:06,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 353 SyntacticMatches, 40 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=284, Invalid=418, Unknown=0, NotChecked=0, Total=702 [2020-07-21 20:29:06,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2020-07-21 20:29:06,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 188. [2020-07-21 20:29:06,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-21 20:29:06,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 201 transitions. [2020-07-21 20:29:06,367 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 201 transitions. Word has length 209 [2020-07-21 20:29:06,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:29:06,368 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 201 transitions. [2020-07-21 20:29:06,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 20:29:06,368 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 201 transitions. [2020-07-21 20:29:06,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-07-21 20:29:06,369 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:29:06,370 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 21, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:29:06,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:06,583 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:29:06,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:29:06,583 INFO L82 PathProgramCache]: Analyzing trace with hash 65077064, now seen corresponding path program 30 times [2020-07-21 20:29:06,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:29:06,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31887370] [2020-07-21 20:29:06,583 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:29:06,682 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:29:06,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:29:06,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 44 conjunts are in the unsatisfiable core [2020-07-21 20:29:06,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:29:07,764 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 1000 proven. 420 refuted. 0 times theorem prover too weak. 764 trivial. 0 not checked. [2020-07-21 20:29:07,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:29:08,895 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 922 proven. 420 refuted. 0 times theorem prover too weak. 842 trivial. 0 not checked. [2020-07-21 20:29:08,896 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31887370] [2020-07-21 20:29:08,896 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:29:08,896 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44] total 65 [2020-07-21 20:29:08,896 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161823527] [2020-07-21 20:29:08,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-07-21 20:29:08,897 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:29:08,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-07-21 20:29:08,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2020-07-21 20:29:08,898 INFO L87 Difference]: Start difference. First operand 188 states and 201 transitions. Second operand 65 states. [2020-07-21 20:29:10,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:29:10,420 INFO L93 Difference]: Finished difference Result 371 states and 447 transitions. [2020-07-21 20:29:10,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 20:29:10,421 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 225 [2020-07-21 20:29:10,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:29:10,423 INFO L225 Difference]: With dead ends: 371 [2020-07-21 20:29:10,423 INFO L226 Difference]: Without dead ends: 274 [2020-07-21 20:29:10,424 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 365 SyntacticMatches, 21 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1870 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1933, Invalid=5377, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 20:29:10,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-21 20:29:10,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 190. [2020-07-21 20:29:10,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 20:29:10,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 203 transitions. [2020-07-21 20:29:10,434 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 203 transitions. Word has length 225 [2020-07-21 20:29:10,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:29:10,434 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 203 transitions. [2020-07-21 20:29:10,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-07-21 20:29:10,434 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 203 transitions. [2020-07-21 20:29:10,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2020-07-21 20:29:10,435 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:29:10,436 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:29:10,650 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:10,651 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:29:10,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:29:10,652 INFO L82 PathProgramCache]: Analyzing trace with hash 1137618157, now seen corresponding path program 31 times [2020-07-21 20:29:10,652 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:29:10,652 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1417903767] [2020-07-21 20:29:10,652 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:29:10,752 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:29:10,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:29:10,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 46 conjunts are in the unsatisfiable core [2020-07-21 20:29:10,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:29:11,805 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 20:29:11,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:29:13,085 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 20:29:13,085 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1417903767] [2020-07-21 20:29:13,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:29:13,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46] total 68 [2020-07-21 20:29:13,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009595542] [2020-07-21 20:29:13,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-21 20:29:13,087 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:29:13,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-21 20:29:13,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1079, Invalid=3477, Unknown=0, NotChecked=0, Total=4556 [2020-07-21 20:29:13,088 INFO L87 Difference]: Start difference. First operand 190 states and 203 transitions. Second operand 68 states. [2020-07-21 20:29:14,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:29:14,572 INFO L93 Difference]: Finished difference Result 375 states and 454 transitions. [2020-07-21 20:29:14,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-21 20:29:14,572 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 227 [2020-07-21 20:29:14,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:29:14,574 INFO L225 Difference]: With dead ends: 375 [2020-07-21 20:29:14,574 INFO L226 Difference]: Without dead ends: 280 [2020-07-21 20:29:14,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 365 SyntacticMatches, 22 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2058 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2113, Invalid=5897, Unknown=0, NotChecked=0, Total=8010 [2020-07-21 20:29:14,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-07-21 20:29:14,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 192. [2020-07-21 20:29:14,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-21 20:29:14,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 205 transitions. [2020-07-21 20:29:14,586 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 205 transitions. Word has length 227 [2020-07-21 20:29:14,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:29:14,587 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 205 transitions. [2020-07-21 20:29:14,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-21 20:29:14,587 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 205 transitions. [2020-07-21 20:29:14,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2020-07-21 20:29:14,588 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:29:14,589 INFO L422 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:29:14,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:14,803 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:29:14,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:29:14,803 INFO L82 PathProgramCache]: Analyzing trace with hash 1057457490, now seen corresponding path program 32 times [2020-07-21 20:29:14,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:29:14,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1594862627] [2020-07-21 20:29:14,804 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:29:14,901 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:29:14,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:29:14,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-21 20:29:14,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:29:15,246 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:29:15,311 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 20:29:15,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:29:15,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:29:16,042 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 20:29:16,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1594862627] [2020-07-21 20:29:16,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:29:16,043 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2020-07-21 20:29:16,043 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898425371] [2020-07-21 20:29:16,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 20:29:16,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:29:16,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 20:29:16,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=427, Unknown=0, NotChecked=0, Total=756 [2020-07-21 20:29:16,045 INFO L87 Difference]: Start difference. First operand 192 states and 205 transitions. Second operand 28 states. [2020-07-21 20:29:16,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:29:16,327 INFO L93 Difference]: Finished difference Result 211 states and 226 transitions. [2020-07-21 20:29:16,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 20:29:16,328 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 229 [2020-07-21 20:29:16,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:29:16,330 INFO L225 Difference]: With dead ends: 211 [2020-07-21 20:29:16,330 INFO L226 Difference]: Without dead ends: 209 [2020-07-21 20:29:16,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 387 SyntacticMatches, 44 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=333, Invalid=479, Unknown=0, NotChecked=0, Total=812 [2020-07-21 20:29:16,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-21 20:29:16,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 204. [2020-07-21 20:29:16,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-21 20:29:16,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 218 transitions. [2020-07-21 20:29:16,342 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 218 transitions. Word has length 229 [2020-07-21 20:29:16,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:29:16,342 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 218 transitions. [2020-07-21 20:29:16,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 20:29:16,343 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 218 transitions. [2020-07-21 20:29:16,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2020-07-21 20:29:16,344 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:29:16,344 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 23, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:29:16,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:16,558 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:29:16,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:29:16,558 INFO L82 PathProgramCache]: Analyzing trace with hash -777665740, now seen corresponding path program 33 times [2020-07-21 20:29:16,559 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:29:16,559 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1311320743] [2020-07-21 20:29:16,559 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:29:16,667 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:29:16,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:29:16,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 654 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-21 20:29:16,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:29:17,861 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1188 proven. 506 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2020-07-21 20:29:17,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:29:19,217 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1102 proven. 506 refuted. 0 times theorem prover too weak. 1014 trivial. 0 not checked. [2020-07-21 20:29:19,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1311320743] [2020-07-21 20:29:19,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:29:19,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48] total 71 [2020-07-21 20:29:19,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673353131] [2020-07-21 20:29:19,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-07-21 20:29:19,218 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:29:19,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-07-21 20:29:19,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2020-07-21 20:29:19,220 INFO L87 Difference]: Start difference. First operand 204 states and 218 transitions. Second operand 71 states. [2020-07-21 20:29:20,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:29:20,959 INFO L93 Difference]: Finished difference Result 403 states and 486 transitions. [2020-07-21 20:29:20,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 20:29:20,960 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 245 [2020-07-21 20:29:20,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:29:20,961 INFO L225 Difference]: With dead ends: 403 [2020-07-21 20:29:20,961 INFO L226 Difference]: Without dead ends: 298 [2020-07-21 20:29:20,962 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 397 SyntacticMatches, 23 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2255 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2301, Invalid=6441, Unknown=0, NotChecked=0, Total=8742 [2020-07-21 20:29:20,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2020-07-21 20:29:20,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 206. [2020-07-21 20:29:20,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-21 20:29:20,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 220 transitions. [2020-07-21 20:29:20,974 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 220 transitions. Word has length 245 [2020-07-21 20:29:20,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:29:20,975 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 220 transitions. [2020-07-21 20:29:20,975 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-07-21 20:29:20,975 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 220 transitions. [2020-07-21 20:29:20,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2020-07-21 20:29:20,977 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:29:20,977 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:29:21,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:21,191 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:29:21,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:29:21,192 INFO L82 PathProgramCache]: Analyzing trace with hash 1435577433, now seen corresponding path program 34 times [2020-07-21 20:29:21,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:29:21,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [481966374] [2020-07-21 20:29:21,192 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:29:21,294 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:29:21,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:29:21,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 50 conjunts are in the unsatisfiable core [2020-07-21 20:29:21,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:29:22,555 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 20:29:22,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:29:24,058 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 20:29:24,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [481966374] [2020-07-21 20:29:24,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:29:24,059 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50] total 74 [2020-07-21 20:29:24,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428140115] [2020-07-21 20:29:24,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2020-07-21 20:29:24,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:29:24,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2020-07-21 20:29:24,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2020-07-21 20:29:24,061 INFO L87 Difference]: Start difference. First operand 206 states and 220 transitions. Second operand 74 states. [2020-07-21 20:29:25,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:29:25,943 INFO L93 Difference]: Finished difference Result 407 states and 493 transitions. [2020-07-21 20:29:25,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 20:29:25,943 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 247 [2020-07-21 20:29:25,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:29:25,945 INFO L225 Difference]: With dead ends: 407 [2020-07-21 20:29:25,945 INFO L226 Difference]: Without dead ends: 304 [2020-07-21 20:29:25,947 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 397 SyntacticMatches, 24 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2461 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2497, Invalid=7009, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 20:29:25,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2020-07-21 20:29:25,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 208. [2020-07-21 20:29:25,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-21 20:29:25,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 222 transitions. [2020-07-21 20:29:25,958 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 222 transitions. Word has length 247 [2020-07-21 20:29:25,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:29:25,959 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 222 transitions. [2020-07-21 20:29:25,959 INFO L480 AbstractCegarLoop]: Interpolant automaton has 74 states. [2020-07-21 20:29:25,959 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 222 transitions. [2020-07-21 20:29:25,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-21 20:29:25,960 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:29:25,960 INFO L422 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:29:26,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:26,174 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:29:26,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:29:26,175 INFO L82 PathProgramCache]: Analyzing trace with hash -1941512130, now seen corresponding path program 35 times [2020-07-21 20:29:26,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:29:26,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1289687638] [2020-07-21 20:29:26,175 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:29:26,279 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:29:26,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:29:26,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-21 20:29:26,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:29:26,709 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:29:26,790 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 20:29:26,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:29:26,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:29:27,645 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 20:29:27,645 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1289687638] [2020-07-21 20:29:27,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:29:27,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2020-07-21 20:29:27,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101077896] [2020-07-21 20:29:27,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 20:29:27,646 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:29:27,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 20:29:27,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=488, Unknown=0, NotChecked=0, Total=870 [2020-07-21 20:29:27,647 INFO L87 Difference]: Start difference. First operand 208 states and 222 transitions. Second operand 30 states. [2020-07-21 20:29:27,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:29:27,973 INFO L93 Difference]: Finished difference Result 227 states and 243 transitions. [2020-07-21 20:29:27,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 20:29:27,974 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 249 [2020-07-21 20:29:27,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:29:27,976 INFO L225 Difference]: With dead ends: 227 [2020-07-21 20:29:27,976 INFO L226 Difference]: Without dead ends: 225 [2020-07-21 20:29:27,977 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 421 SyntacticMatches, 48 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 743 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=386, Invalid=544, Unknown=0, NotChecked=0, Total=930 [2020-07-21 20:29:27,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-21 20:29:27,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 220. [2020-07-21 20:29:27,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2020-07-21 20:29:27,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 235 transitions. [2020-07-21 20:29:27,987 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 235 transitions. Word has length 249 [2020-07-21 20:29:27,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:29:27,988 INFO L479 AbstractCegarLoop]: Abstraction has 220 states and 235 transitions. [2020-07-21 20:29:27,988 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 20:29:27,988 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 235 transitions. [2020-07-21 20:29:27,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2020-07-21 20:29:27,990 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:29:27,990 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 25, 25, 25, 25, 25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:29:28,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:28,204 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:29:28,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:29:28,204 INFO L82 PathProgramCache]: Analyzing trace with hash -712391136, now seen corresponding path program 36 times [2020-07-21 20:29:28,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:29:28,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [938105187] [2020-07-21 20:29:28,205 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:29:28,323 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:29:28,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:29:28,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 708 conjuncts, 52 conjunts are in the unsatisfiable core [2020-07-21 20:29:28,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:29:29,724 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1392 proven. 600 refuted. 0 times theorem prover too weak. 1108 trivial. 0 not checked. [2020-07-21 20:29:29,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:29:31,350 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1298 proven. 600 refuted. 0 times theorem prover too weak. 1202 trivial. 0 not checked. [2020-07-21 20:29:31,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [938105187] [2020-07-21 20:29:31,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:29:31,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52] total 77 [2020-07-21 20:29:31,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359965047] [2020-07-21 20:29:31,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-07-21 20:29:31,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:29:31,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-07-21 20:29:31,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2020-07-21 20:29:31,353 INFO L87 Difference]: Start difference. First operand 220 states and 235 transitions. Second operand 77 states. [2020-07-21 20:29:33,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:29:33,312 INFO L93 Difference]: Finished difference Result 435 states and 525 transitions. [2020-07-21 20:29:33,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-21 20:29:33,312 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 265 [2020-07-21 20:29:33,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:29:33,314 INFO L225 Difference]: With dead ends: 435 [2020-07-21 20:29:33,315 INFO L226 Difference]: Without dead ends: 322 [2020-07-21 20:29:33,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 554 GetRequests, 429 SyntacticMatches, 25 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2676 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2701, Invalid=7601, Unknown=0, NotChecked=0, Total=10302 [2020-07-21 20:29:33,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-21 20:29:33,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 222. [2020-07-21 20:29:33,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-21 20:29:33,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 237 transitions. [2020-07-21 20:29:33,327 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 237 transitions. Word has length 265 [2020-07-21 20:29:33,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:29:33,327 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 237 transitions. [2020-07-21 20:29:33,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-07-21 20:29:33,327 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 237 transitions. [2020-07-21 20:29:33,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2020-07-21 20:29:33,329 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:29:33,329 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:29:33,538 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:33,539 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:29:33,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:29:33,540 INFO L82 PathProgramCache]: Analyzing trace with hash -993908027, now seen corresponding path program 37 times [2020-07-21 20:29:33,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:29:33,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [920429944] [2020-07-21 20:29:33,540 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:29:33,667 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:29:33,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:29:33,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 54 conjunts are in the unsatisfiable core [2020-07-21 20:29:33,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:29:35,171 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 20:29:35,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:29:36,947 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 20:29:36,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [920429944] [2020-07-21 20:29:36,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:29:36,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54] total 80 [2020-07-21 20:29:36,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398494459] [2020-07-21 20:29:36,949 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2020-07-21 20:29:36,949 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:29:36,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2020-07-21 20:29:36,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2020-07-21 20:29:36,949 INFO L87 Difference]: Start difference. First operand 222 states and 237 transitions. Second operand 80 states. [2020-07-21 20:29:39,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:29:39,024 INFO L93 Difference]: Finished difference Result 439 states and 532 transitions. [2020-07-21 20:29:39,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 20:29:39,025 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 267 [2020-07-21 20:29:39,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:29:39,026 INFO L225 Difference]: With dead ends: 439 [2020-07-21 20:29:39,026 INFO L226 Difference]: Without dead ends: 328 [2020-07-21 20:29:39,028 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 429 SyntacticMatches, 26 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2900 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=2913, Invalid=8217, Unknown=0, NotChecked=0, Total=11130 [2020-07-21 20:29:39,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2020-07-21 20:29:39,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 224. [2020-07-21 20:29:39,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-21 20:29:39,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 239 transitions. [2020-07-21 20:29:39,039 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 239 transitions. Word has length 267 [2020-07-21 20:29:39,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:29:39,040 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 239 transitions. [2020-07-21 20:29:39,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 80 states. [2020-07-21 20:29:39,040 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 239 transitions. [2020-07-21 20:29:39,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-07-21 20:29:39,041 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:29:39,042 INFO L422 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:29:39,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:39,246 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:29:39,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:29:39,246 INFO L82 PathProgramCache]: Analyzing trace with hash -948700630, now seen corresponding path program 38 times [2020-07-21 20:29:39,246 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:29:39,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [368007725] [2020-07-21 20:29:39,247 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:29:39,359 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:29:39,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:29:39,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 55 conjunts are in the unsatisfiable core [2020-07-21 20:29:39,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:29:39,949 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:29:40,062 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 20:29:40,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:29:40,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:29:41,123 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 20:29:41,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [368007725] [2020-07-21 20:29:41,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:29:41,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2020-07-21 20:29:41,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080537683] [2020-07-21 20:29:41,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 20:29:41,125 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:29:41,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 20:29:41,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=553, Unknown=0, NotChecked=0, Total=992 [2020-07-21 20:29:41,125 INFO L87 Difference]: Start difference. First operand 224 states and 239 transitions. Second operand 32 states. [2020-07-21 20:29:41,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:29:41,543 INFO L93 Difference]: Finished difference Result 243 states and 260 transitions. [2020-07-21 20:29:41,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 20:29:41,549 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 269 [2020-07-21 20:29:41,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:29:41,551 INFO L225 Difference]: With dead ends: 243 [2020-07-21 20:29:41,551 INFO L226 Difference]: Without dead ends: 241 [2020-07-21 20:29:41,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 455 SyntacticMatches, 52 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=443, Invalid=613, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 20:29:41,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2020-07-21 20:29:41,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 236. [2020-07-21 20:29:41,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-21 20:29:41,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 252 transitions. [2020-07-21 20:29:41,563 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 252 transitions. Word has length 269 [2020-07-21 20:29:41,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:29:41,565 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 252 transitions. [2020-07-21 20:29:41,565 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 20:29:41,565 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 252 transitions. [2020-07-21 20:29:41,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2020-07-21 20:29:41,567 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:29:41,568 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:29:41,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:41,783 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:29:41,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:29:41,784 INFO L82 PathProgramCache]: Analyzing trace with hash 167610380, now seen corresponding path program 39 times [2020-07-21 20:29:41,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:29:41,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [279654017] [2020-07-21 20:29:41,784 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:29:41,909 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:29:41,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:29:41,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 762 conjuncts, 56 conjunts are in the unsatisfiable core [2020-07-21 20:29:41,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:29:43,592 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1612 proven. 702 refuted. 0 times theorem prover too weak. 1304 trivial. 0 not checked. [2020-07-21 20:29:43,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:29:45,651 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1510 proven. 702 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2020-07-21 20:29:45,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [279654017] [2020-07-21 20:29:45,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:29:45,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56] total 83 [2020-07-21 20:29:45,652 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360733390] [2020-07-21 20:29:45,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-07-21 20:29:45,653 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:29:45,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-07-21 20:29:45,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1594, Invalid=5212, Unknown=0, NotChecked=0, Total=6806 [2020-07-21 20:29:45,655 INFO L87 Difference]: Start difference. First operand 236 states and 252 transitions. Second operand 83 states. [2020-07-21 20:29:47,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:29:47,935 INFO L93 Difference]: Finished difference Result 467 states and 564 transitions. [2020-07-21 20:29:47,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-21 20:29:47,936 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 285 [2020-07-21 20:29:47,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:29:47,938 INFO L225 Difference]: With dead ends: 467 [2020-07-21 20:29:47,938 INFO L226 Difference]: Without dead ends: 346 [2020-07-21 20:29:47,939 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 596 GetRequests, 461 SyntacticMatches, 27 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3133 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=3133, Invalid=8857, Unknown=0, NotChecked=0, Total=11990 [2020-07-21 20:29:47,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2020-07-21 20:29:47,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 238. [2020-07-21 20:29:47,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-21 20:29:47,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 254 transitions. [2020-07-21 20:29:47,950 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 254 transitions. Word has length 285 [2020-07-21 20:29:47,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:29:47,950 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 254 transitions. [2020-07-21 20:29:47,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-07-21 20:29:47,951 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 254 transitions. [2020-07-21 20:29:47,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-07-21 20:29:47,952 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:29:47,952 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:29:48,152 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:48,153 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:29:48,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:29:48,154 INFO L82 PathProgramCache]: Analyzing trace with hash 196225073, now seen corresponding path program 40 times [2020-07-21 20:29:48,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:29:48,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1934351157] [2020-07-21 20:29:48,154 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:29:48,271 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:29:48,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:29:48,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 772 conjuncts, 58 conjunts are in the unsatisfiable core [2020-07-21 20:29:48,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:29:50,059 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 20:29:50,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:29:52,164 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 20:29:52,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1934351157] [2020-07-21 20:29:52,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:29:52,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58] total 86 [2020-07-21 20:29:52,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239102278] [2020-07-21 20:29:52,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2020-07-21 20:29:52,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:29:52,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2020-07-21 20:29:52,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 20:29:52,166 INFO L87 Difference]: Start difference. First operand 238 states and 254 transitions. Second operand 86 states. [2020-07-21 20:29:54,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:29:54,537 INFO L93 Difference]: Finished difference Result 471 states and 571 transitions. [2020-07-21 20:29:54,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-21 20:29:54,538 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 287 [2020-07-21 20:29:54,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:29:54,539 INFO L225 Difference]: With dead ends: 471 [2020-07-21 20:29:54,540 INFO L226 Difference]: Without dead ends: 352 [2020-07-21 20:29:54,541 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 461 SyntacticMatches, 28 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3375 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3361, Invalid=9521, Unknown=0, NotChecked=0, Total=12882 [2020-07-21 20:29:54,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2020-07-21 20:29:54,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 240. [2020-07-21 20:29:54,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-21 20:29:54,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 256 transitions. [2020-07-21 20:29:54,554 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 256 transitions. Word has length 287 [2020-07-21 20:29:54,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:29:54,554 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 256 transitions. [2020-07-21 20:29:54,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 86 states. [2020-07-21 20:29:54,554 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 256 transitions. [2020-07-21 20:29:54,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2020-07-21 20:29:54,556 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:29:54,557 INFO L422 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:29:54,769 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:54,770 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:29:54,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:29:54,770 INFO L82 PathProgramCache]: Analyzing trace with hash 1925141270, now seen corresponding path program 41 times [2020-07-21 20:29:54,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:29:54,771 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1654248941] [2020-07-21 20:29:54,771 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:29:54,896 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:29:54,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:29:54,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 782 conjuncts, 59 conjunts are in the unsatisfiable core [2020-07-21 20:29:54,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:29:55,475 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:29:55,560 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 20:29:55,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:29:55,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:29:56,831 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 20:29:56,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1654248941] [2020-07-21 20:29:56,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:29:56,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2020-07-21 20:29:56,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605217113] [2020-07-21 20:29:56,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 20:29:56,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:29:56,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 20:29:56,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=500, Invalid=622, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 20:29:56,836 INFO L87 Difference]: Start difference. First operand 240 states and 256 transitions. Second operand 34 states. [2020-07-21 20:29:57,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:29:57,364 INFO L93 Difference]: Finished difference Result 259 states and 277 transitions. [2020-07-21 20:29:57,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 20:29:57,365 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 289 [2020-07-21 20:29:57,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:29:57,368 INFO L225 Difference]: With dead ends: 259 [2020-07-21 20:29:57,368 INFO L226 Difference]: Without dead ends: 257 [2020-07-21 20:29:57,369 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 489 SyntacticMatches, 56 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=504, Invalid=686, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 20:29:57,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-21 20:29:57,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 252. [2020-07-21 20:29:57,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 252 states. [2020-07-21 20:29:57,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 269 transitions. [2020-07-21 20:29:57,385 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 269 transitions. Word has length 289 [2020-07-21 20:29:57,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:29:57,386 INFO L479 AbstractCegarLoop]: Abstraction has 252 states and 269 transitions. [2020-07-21 20:29:57,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 20:29:57,386 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 269 transitions. [2020-07-21 20:29:57,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2020-07-21 20:29:57,388 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:29:57,388 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 29, 29, 29, 29, 29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:29:57,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:29:57,589 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:29:57,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:29:57,590 INFO L82 PathProgramCache]: Analyzing trace with hash -2144237320, now seen corresponding path program 42 times [2020-07-21 20:29:57,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:29:57,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [459449653] [2020-07-21 20:29:57,591 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:29:57,720 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:29:57,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:29:57,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 816 conjuncts, 60 conjunts are in the unsatisfiable core [2020-07-21 20:29:57,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:29:59,677 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1848 proven. 812 refuted. 0 times theorem prover too weak. 1516 trivial. 0 not checked. [2020-07-21 20:29:59,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:30:02,031 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1738 proven. 812 refuted. 0 times theorem prover too weak. 1626 trivial. 0 not checked. [2020-07-21 20:30:02,031 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [459449653] [2020-07-21 20:30:02,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:30:02,032 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60] total 89 [2020-07-21 20:30:02,032 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206418023] [2020-07-21 20:30:02,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-07-21 20:30:02,033 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:30:02,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-07-21 20:30:02,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2020-07-21 20:30:02,034 INFO L87 Difference]: Start difference. First operand 252 states and 269 transitions. Second operand 89 states. [2020-07-21 20:30:04,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:30:04,608 INFO L93 Difference]: Finished difference Result 499 states and 603 transitions. [2020-07-21 20:30:04,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-07-21 20:30:04,608 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 305 [2020-07-21 20:30:04,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:30:04,611 INFO L225 Difference]: With dead ends: 499 [2020-07-21 20:30:04,611 INFO L226 Difference]: Without dead ends: 370 [2020-07-21 20:30:04,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 638 GetRequests, 493 SyntacticMatches, 29 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3626 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=3597, Invalid=10209, Unknown=0, NotChecked=0, Total=13806 [2020-07-21 20:30:04,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2020-07-21 20:30:04,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 254. [2020-07-21 20:30:04,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-21 20:30:04,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 271 transitions. [2020-07-21 20:30:04,627 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 271 transitions. Word has length 305 [2020-07-21 20:30:04,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:30:04,627 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 271 transitions. [2020-07-21 20:30:04,627 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-07-21 20:30:04,627 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 271 transitions. [2020-07-21 20:30:04,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 308 [2020-07-21 20:30:04,629 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:30:04,630 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:30:04,844 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:30:04,845 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:30:04,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:30:04,846 INFO L82 PathProgramCache]: Analyzing trace with hash 191997085, now seen corresponding path program 43 times [2020-07-21 20:30:04,846 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:30:04,846 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1132306935] [2020-07-21 20:30:04,846 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:30:04,984 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:30:04,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:30:04,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 62 conjunts are in the unsatisfiable core [2020-07-21 20:30:04,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:30:07,066 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 20:30:07,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:30:09,588 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 20:30:09,589 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1132306935] [2020-07-21 20:30:09,589 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:30:09,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62] total 92 [2020-07-21 20:30:09,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666655372] [2020-07-21 20:30:09,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2020-07-21 20:30:09,590 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:30:09,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2020-07-21 20:30:09,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2020-07-21 20:30:09,591 INFO L87 Difference]: Start difference. First operand 254 states and 271 transitions. Second operand 92 states. [2020-07-21 20:30:12,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:30:12,286 INFO L93 Difference]: Finished difference Result 503 states and 610 transitions. [2020-07-21 20:30:12,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-07-21 20:30:12,286 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 307 [2020-07-21 20:30:12,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:30:12,288 INFO L225 Difference]: With dead ends: 503 [2020-07-21 20:30:12,288 INFO L226 Difference]: Without dead ends: 376 [2020-07-21 20:30:12,289 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 643 GetRequests, 493 SyntacticMatches, 30 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3886 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=3841, Invalid=10921, Unknown=0, NotChecked=0, Total=14762 [2020-07-21 20:30:12,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2020-07-21 20:30:12,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 256. [2020-07-21 20:30:12,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-21 20:30:12,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 273 transitions. [2020-07-21 20:30:12,303 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 273 transitions. Word has length 307 [2020-07-21 20:30:12,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:30:12,304 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 273 transitions. [2020-07-21 20:30:12,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 92 states. [2020-07-21 20:30:12,304 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 273 transitions. [2020-07-21 20:30:12,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2020-07-21 20:30:12,306 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:30:12,306 INFO L422 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:30:12,521 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:30:12,522 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:30:12,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:30:12,522 INFO L82 PathProgramCache]: Analyzing trace with hash -954635518, now seen corresponding path program 44 times [2020-07-21 20:30:12,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:30:12,522 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1021238132] [2020-07-21 20:30:12,522 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:30:12,646 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:30:12,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:30:12,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 836 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-21 20:30:12,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:30:13,331 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:30:13,439 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 20:30:13,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:30:13,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:30:14,866 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 20:30:14,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1021238132] [2020-07-21 20:30:14,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:30:14,867 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2020-07-21 20:30:14,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476638726] [2020-07-21 20:30:14,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 20:30:14,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:30:14,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 20:30:14,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=695, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 20:30:14,868 INFO L87 Difference]: Start difference. First operand 256 states and 273 transitions. Second operand 36 states. [2020-07-21 20:30:15,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:30:15,313 INFO L93 Difference]: Finished difference Result 275 states and 294 transitions. [2020-07-21 20:30:15,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 20:30:15,316 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 309 [2020-07-21 20:30:15,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:30:15,317 INFO L225 Difference]: With dead ends: 275 [2020-07-21 20:30:15,317 INFO L226 Difference]: Without dead ends: 273 [2020-07-21 20:30:15,318 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 618 GetRequests, 523 SyntacticMatches, 60 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1109 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=569, Invalid=763, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 20:30:15,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2020-07-21 20:30:15,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 268. [2020-07-21 20:30:15,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-21 20:30:15,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 286 transitions. [2020-07-21 20:30:15,330 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 286 transitions. Word has length 309 [2020-07-21 20:30:15,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:30:15,331 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 286 transitions. [2020-07-21 20:30:15,331 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 20:30:15,331 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 286 transitions. [2020-07-21 20:30:15,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2020-07-21 20:30:15,333 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:30:15,334 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 31, 31, 31, 31, 31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:30:15,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:30:15,548 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:30:15,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:30:15,548 INFO L82 PathProgramCache]: Analyzing trace with hash -2146023196, now seen corresponding path program 45 times [2020-07-21 20:30:15,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:30:15,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [934538696] [2020-07-21 20:30:15,549 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:30:15,674 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:30:15,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:30:15,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 870 conjuncts, 64 conjunts are in the unsatisfiable core [2020-07-21 20:30:15,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:30:17,948 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 2100 proven. 930 refuted. 0 times theorem prover too weak. 1744 trivial. 0 not checked. [2020-07-21 20:30:17,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:30:20,650 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 1982 proven. 930 refuted. 0 times theorem prover too weak. 1862 trivial. 0 not checked. [2020-07-21 20:30:20,650 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [934538696] [2020-07-21 20:30:20,651 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:30:20,651 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64] total 95 [2020-07-21 20:30:20,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030278161] [2020-07-21 20:30:20,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-07-21 20:30:20,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:30:20,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-07-21 20:30:20,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2020-07-21 20:30:20,652 INFO L87 Difference]: Start difference. First operand 268 states and 286 transitions. Second operand 95 states. [2020-07-21 20:30:24,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:30:24,471 INFO L93 Difference]: Finished difference Result 531 states and 642 transitions. [2020-07-21 20:30:24,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-21 20:30:24,472 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 325 [2020-07-21 20:30:24,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:30:24,475 INFO L225 Difference]: With dead ends: 531 [2020-07-21 20:30:24,475 INFO L226 Difference]: Without dead ends: 394 [2020-07-21 20:30:24,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 525 SyntacticMatches, 31 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4155 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=4093, Invalid=11657, Unknown=0, NotChecked=0, Total=15750 [2020-07-21 20:30:24,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2020-07-21 20:30:24,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 270. [2020-07-21 20:30:24,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-21 20:30:24,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 288 transitions. [2020-07-21 20:30:24,500 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 288 transitions. Word has length 325 [2020-07-21 20:30:24,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:30:24,501 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 288 transitions. [2020-07-21 20:30:24,501 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-07-21 20:30:24,501 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 288 transitions. [2020-07-21 20:30:24,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-21 20:30:24,505 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:30:24,505 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:30:24,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:30:24,721 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:30:24,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:30:24,722 INFO L82 PathProgramCache]: Analyzing trace with hash 735125513, now seen corresponding path program 46 times [2020-07-21 20:30:24,722 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:30:24,722 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1607956558] [2020-07-21 20:30:24,722 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:30:24,928 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:30:24,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:30:24,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 880 conjuncts, 66 conjunts are in the unsatisfiable core [2020-07-21 20:30:24,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:30:28,208 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 20:30:28,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:30:31,129 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 20:30:31,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1607956558] [2020-07-21 20:30:31,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:30:31,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66] total 98 [2020-07-21 20:30:31,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020462875] [2020-07-21 20:30:31,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-07-21 20:30:31,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:30:31,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-07-21 20:30:31,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2209, Invalid=7297, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 20:30:31,132 INFO L87 Difference]: Start difference. First operand 270 states and 288 transitions. Second operand 98 states. [2020-07-21 20:30:34,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:30:34,367 INFO L93 Difference]: Finished difference Result 535 states and 649 transitions. [2020-07-21 20:30:34,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-07-21 20:30:34,367 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 327 [2020-07-21 20:30:34,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:30:34,369 INFO L225 Difference]: With dead ends: 535 [2020-07-21 20:30:34,369 INFO L226 Difference]: Without dead ends: 400 [2020-07-21 20:30:34,371 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 525 SyntacticMatches, 32 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4433 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=4353, Invalid=12417, Unknown=0, NotChecked=0, Total=16770 [2020-07-21 20:30:34,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2020-07-21 20:30:34,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 272. [2020-07-21 20:30:34,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2020-07-21 20:30:34,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 290 transitions. [2020-07-21 20:30:34,384 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 290 transitions. Word has length 327 [2020-07-21 20:30:34,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:30:34,385 INFO L479 AbstractCegarLoop]: Abstraction has 272 states and 290 transitions. [2020-07-21 20:30:34,385 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-07-21 20:30:34,385 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 290 transitions. [2020-07-21 20:30:34,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2020-07-21 20:30:34,387 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:30:34,387 INFO L422 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:30:34,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:30:34,603 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:30:34,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:30:34,603 INFO L82 PathProgramCache]: Analyzing trace with hash -734871058, now seen corresponding path program 47 times [2020-07-21 20:30:34,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:30:34,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1817196128] [2020-07-21 20:30:34,604 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:30:34,743 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:30:34,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:30:34,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 890 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 20:30:34,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:30:35,560 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:30:35,673 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 20:30:35,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:30:35,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:30:37,403 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 20:30:37,403 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1817196128] [2020-07-21 20:30:37,403 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:30:37,403 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2020-07-21 20:30:37,403 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140308465] [2020-07-21 20:30:37,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 20:30:37,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:30:37,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 20:30:37,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=634, Invalid=772, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 20:30:37,404 INFO L87 Difference]: Start difference. First operand 272 states and 290 transitions. Second operand 38 states. [2020-07-21 20:30:37,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:30:37,961 INFO L93 Difference]: Finished difference Result 291 states and 311 transitions. [2020-07-21 20:30:37,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 20:30:37,962 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 329 [2020-07-21 20:30:37,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:30:37,964 INFO L225 Difference]: With dead ends: 291 [2020-07-21 20:30:37,964 INFO L226 Difference]: Without dead ends: 289 [2020-07-21 20:30:37,965 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 557 SyntacticMatches, 64 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=638, Invalid=844, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 20:30:37,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2020-07-21 20:30:37,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 284. [2020-07-21 20:30:37,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-21 20:30:37,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 303 transitions. [2020-07-21 20:30:37,991 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 303 transitions. Word has length 329 [2020-07-21 20:30:37,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:30:37,992 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 303 transitions. [2020-07-21 20:30:37,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 20:30:37,992 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 303 transitions. [2020-07-21 20:30:37,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2020-07-21 20:30:37,994 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:30:37,994 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 33, 33, 33, 33, 33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:30:38,207 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:30:38,208 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:30:38,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:30:38,209 INFO L82 PathProgramCache]: Analyzing trace with hash -1470347312, now seen corresponding path program 48 times [2020-07-21 20:30:38,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:30:38,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2026384481] [2020-07-21 20:30:38,210 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:30:38,349 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:30:38,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:30:38,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 924 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-21 20:30:38,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:30:41,082 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2368 proven. 1056 refuted. 0 times theorem prover too weak. 1988 trivial. 0 not checked. [2020-07-21 20:30:41,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:30:44,278 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2242 proven. 1056 refuted. 0 times theorem prover too weak. 2114 trivial. 0 not checked. [2020-07-21 20:30:44,278 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2026384481] [2020-07-21 20:30:44,278 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:30:44,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68] total 101 [2020-07-21 20:30:44,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814167932] [2020-07-21 20:30:44,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-21 20:30:44,279 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:30:44,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-21 20:30:44,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2020-07-21 20:30:44,280 INFO L87 Difference]: Start difference. First operand 284 states and 303 transitions. Second operand 101 states. [2020-07-21 20:30:47,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:30:47,905 INFO L93 Difference]: Finished difference Result 563 states and 681 transitions. [2020-07-21 20:30:47,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2020-07-21 20:30:47,905 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 345 [2020-07-21 20:30:47,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:30:47,907 INFO L225 Difference]: With dead ends: 563 [2020-07-21 20:30:47,907 INFO L226 Difference]: Without dead ends: 418 [2020-07-21 20:30:47,909 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 557 SyntacticMatches, 33 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4720 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=4621, Invalid=13201, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 20:30:47,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2020-07-21 20:30:47,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 286. [2020-07-21 20:30:47,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2020-07-21 20:30:47,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 305 transitions. [2020-07-21 20:30:47,925 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 305 transitions. Word has length 345 [2020-07-21 20:30:47,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:30:47,926 INFO L479 AbstractCegarLoop]: Abstraction has 286 states and 305 transitions. [2020-07-21 20:30:47,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-21 20:30:47,926 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 305 transitions. [2020-07-21 20:30:47,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2020-07-21 20:30:47,928 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:30:47,928 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 33, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:30:48,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:30:48,142 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:30:48,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:30:48,143 INFO L82 PathProgramCache]: Analyzing trace with hash 2069961333, now seen corresponding path program 49 times [2020-07-21 20:30:48,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:30:48,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [596325468] [2020-07-21 20:30:48,144 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:30:48,287 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:30:48,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:30:48,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 934 conjuncts, 70 conjunts are in the unsatisfiable core [2020-07-21 20:30:48,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:30:51,223 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 20:30:51,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:30:54,686 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 20:30:54,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [596325468] [2020-07-21 20:30:54,686 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:30:54,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70] total 104 [2020-07-21 20:30:54,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150856623] [2020-07-21 20:30:54,687 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2020-07-21 20:30:54,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:30:54,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2020-07-21 20:30:54,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2483, Invalid=8229, Unknown=0, NotChecked=0, Total=10712 [2020-07-21 20:30:54,689 INFO L87 Difference]: Start difference. First operand 286 states and 305 transitions. Second operand 104 states. [2020-07-21 20:30:58,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:30:58,886 INFO L93 Difference]: Finished difference Result 567 states and 688 transitions. [2020-07-21 20:30:58,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-21 20:30:58,886 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 347 [2020-07-21 20:30:58,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:30:58,889 INFO L225 Difference]: With dead ends: 567 [2020-07-21 20:30:58,889 INFO L226 Difference]: Without dead ends: 424 [2020-07-21 20:30:58,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 727 GetRequests, 557 SyntacticMatches, 34 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5016 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=4897, Invalid=14009, Unknown=0, NotChecked=0, Total=18906 [2020-07-21 20:30:58,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2020-07-21 20:30:58,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 288. [2020-07-21 20:30:58,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-21 20:30:58,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 307 transitions. [2020-07-21 20:30:58,903 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 307 transitions. Word has length 347 [2020-07-21 20:30:58,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:30:58,903 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 307 transitions. [2020-07-21 20:30:58,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 104 states. [2020-07-21 20:30:58,903 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 307 transitions. [2020-07-21 20:30:58,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2020-07-21 20:30:58,906 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:30:58,906 INFO L422 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:30:59,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:30:59,122 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:30:59,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:30:59,122 INFO L82 PathProgramCache]: Analyzing trace with hash -1602496550, now seen corresponding path program 50 times [2020-07-21 20:30:59,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:30:59,122 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698538916] [2020-07-21 20:30:59,123 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:30:59,268 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:30:59,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:30:59,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 944 conjuncts, 71 conjunts are in the unsatisfiable core [2020-07-21 20:30:59,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:31:00,253 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:31:00,375 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 20:31:00,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:31:00,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:31:02,423 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 20:31:02,423 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698538916] [2020-07-21 20:31:02,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:31:02,424 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2020-07-21 20:31:02,424 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634530190] [2020-07-21 20:31:02,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-21 20:31:02,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:31:02,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-21 20:31:02,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=707, Invalid=853, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 20:31:02,425 INFO L87 Difference]: Start difference. First operand 288 states and 307 transitions. Second operand 40 states. [2020-07-21 20:31:03,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:31:03,014 INFO L93 Difference]: Finished difference Result 307 states and 328 transitions. [2020-07-21 20:31:03,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 20:31:03,015 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 349 [2020-07-21 20:31:03,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:31:03,017 INFO L225 Difference]: With dead ends: 307 [2020-07-21 20:31:03,017 INFO L226 Difference]: Without dead ends: 305 [2020-07-21 20:31:03,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 591 SyntacticMatches, 68 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1393 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=711, Invalid=929, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 20:31:03,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2020-07-21 20:31:03,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 300. [2020-07-21 20:31:03,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-07-21 20:31:03,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 320 transitions. [2020-07-21 20:31:03,027 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 320 transitions. Word has length 349 [2020-07-21 20:31:03,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:31:03,028 INFO L479 AbstractCegarLoop]: Abstraction has 300 states and 320 transitions. [2020-07-21 20:31:03,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-21 20:31:03,028 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 320 transitions. [2020-07-21 20:31:03,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2020-07-21 20:31:03,031 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:31:03,031 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 35, 35, 35, 35, 35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:31:03,246 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:31:03,247 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:31:03,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:31:03,248 INFO L82 PathProgramCache]: Analyzing trace with hash 242484668, now seen corresponding path program 51 times [2020-07-21 20:31:03,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:31:03,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1151543037] [2020-07-21 20:31:03,248 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:31:03,392 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:31:03,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:31:03,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 978 conjuncts, 72 conjunts are in the unsatisfiable core [2020-07-21 20:31:03,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:31:06,699 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2652 proven. 1190 refuted. 0 times theorem prover too weak. 2248 trivial. 0 not checked. [2020-07-21 20:31:06,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:31:10,587 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2518 proven. 1190 refuted. 0 times theorem prover too weak. 2382 trivial. 0 not checked. [2020-07-21 20:31:10,587 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1151543037] [2020-07-21 20:31:10,587 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:31:10,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72] total 107 [2020-07-21 20:31:10,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375075117] [2020-07-21 20:31:10,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2020-07-21 20:31:10,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:31:10,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2020-07-21 20:31:10,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2020-07-21 20:31:10,589 INFO L87 Difference]: Start difference. First operand 300 states and 320 transitions. Second operand 107 states. [2020-07-21 20:31:14,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:31:14,959 INFO L93 Difference]: Finished difference Result 595 states and 720 transitions. [2020-07-21 20:31:14,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-07-21 20:31:14,959 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 365 [2020-07-21 20:31:14,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:31:14,962 INFO L225 Difference]: With dead ends: 595 [2020-07-21 20:31:14,962 INFO L226 Difference]: Without dead ends: 442 [2020-07-21 20:31:14,963 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 589 SyntacticMatches, 35 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5321 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=5181, Invalid=14841, Unknown=0, NotChecked=0, Total=20022 [2020-07-21 20:31:14,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2020-07-21 20:31:14,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 302. [2020-07-21 20:31:14,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-07-21 20:31:14,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 322 transitions. [2020-07-21 20:31:14,978 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 322 transitions. Word has length 365 [2020-07-21 20:31:14,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:31:14,978 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 322 transitions. [2020-07-21 20:31:14,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 107 states. [2020-07-21 20:31:14,978 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 322 transitions. [2020-07-21 20:31:14,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 368 [2020-07-21 20:31:14,981 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:31:14,981 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:31:15,196 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:31:15,197 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:31:15,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:31:15,197 INFO L82 PathProgramCache]: Analyzing trace with hash -814607391, now seen corresponding path program 52 times [2020-07-21 20:31:15,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:31:15,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [489845836] [2020-07-21 20:31:15,198 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:31:15,345 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:31:15,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:31:15,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 988 conjuncts, 74 conjunts are in the unsatisfiable core [2020-07-21 20:31:15,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:31:18,838 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 20:31:18,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:31:23,062 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 20:31:23,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [489845836] [2020-07-21 20:31:23,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:31:23,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74] total 110 [2020-07-21 20:31:23,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818179303] [2020-07-21 20:31:23,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2020-07-21 20:31:23,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:31:23,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2020-07-21 20:31:23,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2773, Invalid=9217, Unknown=0, NotChecked=0, Total=11990 [2020-07-21 20:31:23,064 INFO L87 Difference]: Start difference. First operand 302 states and 322 transitions. Second operand 110 states. [2020-07-21 20:31:27,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:31:27,571 INFO L93 Difference]: Finished difference Result 599 states and 727 transitions. [2020-07-21 20:31:27,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2020-07-21 20:31:27,571 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 367 [2020-07-21 20:31:27,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:31:27,573 INFO L225 Difference]: With dead ends: 599 [2020-07-21 20:31:27,573 INFO L226 Difference]: Without dead ends: 448 [2020-07-21 20:31:27,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 769 GetRequests, 589 SyntacticMatches, 36 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5635 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=5473, Invalid=15697, Unknown=0, NotChecked=0, Total=21170 [2020-07-21 20:31:27,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2020-07-21 20:31:27,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 304. [2020-07-21 20:31:27,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-21 20:31:27,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 324 transitions. [2020-07-21 20:31:27,592 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 324 transitions. Word has length 367 [2020-07-21 20:31:27,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:31:27,592 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 324 transitions. [2020-07-21 20:31:27,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 110 states. [2020-07-21 20:31:27,592 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 324 transitions. [2020-07-21 20:31:27,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2020-07-21 20:31:27,595 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:31:27,595 INFO L422 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:31:27,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:31:27,809 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:31:27,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:31:27,810 INFO L82 PathProgramCache]: Analyzing trace with hash 1227173062, now seen corresponding path program 53 times [2020-07-21 20:31:27,810 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:31:27,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [949347888] [2020-07-21 20:31:27,810 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:31:27,961 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:31:27,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:31:27,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 75 conjunts are in the unsatisfiable core [2020-07-21 20:31:27,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:31:29,096 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:31:29,254 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 20:31:29,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:31:29,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:31:31,639 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 20:31:31,639 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [949347888] [2020-07-21 20:31:31,639 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:31:31,640 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 42 [2020-07-21 20:31:31,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230035455] [2020-07-21 20:31:31,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-21 20:31:31,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:31:31,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-21 20:31:31,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=784, Invalid=938, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 20:31:31,641 INFO L87 Difference]: Start difference. First operand 304 states and 324 transitions. Second operand 42 states. [2020-07-21 20:31:32,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:31:32,302 INFO L93 Difference]: Finished difference Result 323 states and 345 transitions. [2020-07-21 20:31:32,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 20:31:32,303 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 369 [2020-07-21 20:31:32,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:31:32,305 INFO L225 Difference]: With dead ends: 323 [2020-07-21 20:31:32,305 INFO L226 Difference]: Without dead ends: 321 [2020-07-21 20:31:32,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 738 GetRequests, 625 SyntacticMatches, 72 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1547 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=788, Invalid=1018, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 20:31:32,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-21 20:31:32,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 316. [2020-07-21 20:31:32,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-21 20:31:32,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 337 transitions. [2020-07-21 20:31:32,320 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 337 transitions. Word has length 369 [2020-07-21 20:31:32,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:31:32,321 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 337 transitions. [2020-07-21 20:31:32,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-21 20:31:32,321 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 337 transitions. [2020-07-21 20:31:32,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 386 [2020-07-21 20:31:32,323 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:31:32,324 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 37, 37, 37, 37, 37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:31:32,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:31:32,537 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:31:32,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:31:32,538 INFO L82 PathProgramCache]: Analyzing trace with hash 1586365096, now seen corresponding path program 54 times [2020-07-21 20:31:32,538 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:31:32,538 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [584825721] [2020-07-21 20:31:32,538 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:31:32,692 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:31:32,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:31:32,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 1032 conjuncts, 76 conjunts are in the unsatisfiable core [2020-07-21 20:31:32,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:31:36,483 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2952 proven. 1332 refuted. 0 times theorem prover too weak. 2524 trivial. 0 not checked. [2020-07-21 20:31:36,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:31:40,901 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2810 proven. 1332 refuted. 0 times theorem prover too weak. 2666 trivial. 0 not checked. [2020-07-21 20:31:40,902 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [584825721] [2020-07-21 20:31:40,902 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:31:40,902 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76] total 113 [2020-07-21 20:31:40,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540655721] [2020-07-21 20:31:40,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2020-07-21 20:31:40,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:31:40,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2020-07-21 20:31:40,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2020-07-21 20:31:40,904 INFO L87 Difference]: Start difference. First operand 316 states and 337 transitions. Second operand 113 states. [2020-07-21 20:31:45,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:31:45,865 INFO L93 Difference]: Finished difference Result 627 states and 759 transitions. [2020-07-21 20:31:45,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-21 20:31:45,866 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 385 [2020-07-21 20:31:45,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:31:45,868 INFO L225 Difference]: With dead ends: 627 [2020-07-21 20:31:45,868 INFO L226 Difference]: Without dead ends: 466 [2020-07-21 20:31:45,870 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 806 GetRequests, 621 SyntacticMatches, 37 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5958 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=5773, Invalid=16577, Unknown=0, NotChecked=0, Total=22350 [2020-07-21 20:31:45,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2020-07-21 20:31:45,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 318. [2020-07-21 20:31:45,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2020-07-21 20:31:45,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 339 transitions. [2020-07-21 20:31:45,881 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 339 transitions. Word has length 385 [2020-07-21 20:31:45,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:31:45,881 INFO L479 AbstractCegarLoop]: Abstraction has 318 states and 339 transitions. [2020-07-21 20:31:45,881 INFO L480 AbstractCegarLoop]: Interpolant automaton has 113 states. [2020-07-21 20:31:45,882 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 339 transitions. [2020-07-21 20:31:45,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2020-07-21 20:31:45,883 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:31:45,883 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 37, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:31:46,084 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:31:46,084 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:31:46,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:31:46,085 INFO L82 PathProgramCache]: Analyzing trace with hash -468415411, now seen corresponding path program 55 times [2020-07-21 20:31:46,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:31:46,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1870558450] [2020-07-21 20:31:46,086 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:31:46,240 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:31:46,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:31:46,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 1042 conjuncts, 78 conjunts are in the unsatisfiable core [2020-07-21 20:31:46,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:31:50,435 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 20:31:50,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:31:55,482 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 20:31:55,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1870558450] [2020-07-21 20:31:55,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:31:55,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78] total 116 [2020-07-21 20:31:55,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671288058] [2020-07-21 20:31:55,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2020-07-21 20:31:55,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:31:55,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2020-07-21 20:31:55,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3079, Invalid=10261, Unknown=0, NotChecked=0, Total=13340 [2020-07-21 20:31:55,485 INFO L87 Difference]: Start difference. First operand 318 states and 339 transitions. Second operand 116 states. [2020-07-21 20:32:01,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:32:01,086 INFO L93 Difference]: Finished difference Result 631 states and 766 transitions. [2020-07-21 20:32:01,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2020-07-21 20:32:01,086 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 387 [2020-07-21 20:32:01,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:32:01,088 INFO L225 Difference]: With dead ends: 631 [2020-07-21 20:32:01,088 INFO L226 Difference]: Without dead ends: 472 [2020-07-21 20:32:01,090 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 811 GetRequests, 621 SyntacticMatches, 38 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6290 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=6081, Invalid=17481, Unknown=0, NotChecked=0, Total=23562 [2020-07-21 20:32:01,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-07-21 20:32:01,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 320. [2020-07-21 20:32:01,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 320 states. [2020-07-21 20:32:01,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 341 transitions. [2020-07-21 20:32:01,105 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 341 transitions. Word has length 387 [2020-07-21 20:32:01,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:32:01,105 INFO L479 AbstractCegarLoop]: Abstraction has 320 states and 341 transitions. [2020-07-21 20:32:01,105 INFO L480 AbstractCegarLoop]: Interpolant automaton has 116 states. [2020-07-21 20:32:01,105 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 341 transitions. [2020-07-21 20:32:01,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2020-07-21 20:32:01,108 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:32:01,108 INFO L422 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:32:01,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:32:01,315 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:32:01,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:32:01,316 INFO L82 PathProgramCache]: Analyzing trace with hash 572473522, now seen corresponding path program 56 times [2020-07-21 20:32:01,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:32:01,316 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1215143033] [2020-07-21 20:32:01,316 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:32:01,476 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:32:01,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:32:01,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 1052 conjuncts, 79 conjunts are in the unsatisfiable core [2020-07-21 20:32:01,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:32:02,990 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:32:03,167 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 20:32:03,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:32:03,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:32:06,184 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 20:32:06,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1215143033] [2020-07-21 20:32:06,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:32:06,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43] total 44 [2020-07-21 20:32:06,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527545072] [2020-07-21 20:32:06,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 20:32:06,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:32:06,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 20:32:06,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=865, Invalid=1027, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 20:32:06,186 INFO L87 Difference]: Start difference. First operand 320 states and 341 transitions. Second operand 44 states. [2020-07-21 20:32:06,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:32:06,950 INFO L93 Difference]: Finished difference Result 339 states and 362 transitions. [2020-07-21 20:32:06,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 20:32:06,951 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 389 [2020-07-21 20:32:06,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:32:06,954 INFO L225 Difference]: With dead ends: 339 [2020-07-21 20:32:06,954 INFO L226 Difference]: Without dead ends: 337 [2020-07-21 20:32:06,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 778 GetRequests, 659 SyntacticMatches, 76 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1709 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=869, Invalid=1111, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 20:32:06,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2020-07-21 20:32:06,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 332. [2020-07-21 20:32:06,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-07-21 20:32:06,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 354 transitions. [2020-07-21 20:32:06,967 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 354 transitions. Word has length 389 [2020-07-21 20:32:06,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:32:06,968 INFO L479 AbstractCegarLoop]: Abstraction has 332 states and 354 transitions. [2020-07-21 20:32:06,968 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 20:32:06,968 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 354 transitions. [2020-07-21 20:32:06,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2020-07-21 20:32:06,969 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:32:06,970 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 39, 39, 39, 39, 39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:32:07,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:32:07,174 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:32:07,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:32:07,176 INFO L82 PathProgramCache]: Analyzing trace with hash -73744748, now seen corresponding path program 57 times [2020-07-21 20:32:07,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:32:07,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [121113072] [2020-07-21 20:32:07,177 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:32:07,340 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:32:07,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:32:07,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 1086 conjuncts, 80 conjunts are in the unsatisfiable core [2020-07-21 20:32:07,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:32:11,872 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3268 proven. 1482 refuted. 0 times theorem prover too weak. 2816 trivial. 0 not checked. [2020-07-21 20:32:11,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:32:17,413 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3118 proven. 1482 refuted. 0 times theorem prover too weak. 2966 trivial. 0 not checked. [2020-07-21 20:32:17,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [121113072] [2020-07-21 20:32:17,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:32:17,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80] total 119 [2020-07-21 20:32:17,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165879329] [2020-07-21 20:32:17,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2020-07-21 20:32:17,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:32:17,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2020-07-21 20:32:17,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2020-07-21 20:32:17,416 INFO L87 Difference]: Start difference. First operand 332 states and 354 transitions. Second operand 119 states. [2020-07-21 20:32:23,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:32:23,476 INFO L93 Difference]: Finished difference Result 659 states and 798 transitions. [2020-07-21 20:32:23,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2020-07-21 20:32:23,476 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 405 [2020-07-21 20:32:23,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:32:23,478 INFO L225 Difference]: With dead ends: 659 [2020-07-21 20:32:23,478 INFO L226 Difference]: Without dead ends: 490 [2020-07-21 20:32:23,480 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 653 SyntacticMatches, 39 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6631 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=6397, Invalid=18409, Unknown=0, NotChecked=0, Total=24806 [2020-07-21 20:32:23,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-21 20:32:23,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 334. [2020-07-21 20:32:23,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 334 states. [2020-07-21 20:32:23,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 356 transitions. [2020-07-21 20:32:23,498 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 356 transitions. Word has length 405 [2020-07-21 20:32:23,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:32:23,498 INFO L479 AbstractCegarLoop]: Abstraction has 334 states and 356 transitions. [2020-07-21 20:32:23,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 119 states. [2020-07-21 20:32:23,498 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 356 transitions. [2020-07-21 20:32:23,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-07-21 20:32:23,501 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:32:23,501 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 39, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:32:23,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:32:23,716 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:32:23,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:32:23,717 INFO L82 PathProgramCache]: Analyzing trace with hash 2082014137, now seen corresponding path program 58 times [2020-07-21 20:32:23,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:32:23,717 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1190455954] [2020-07-21 20:32:23,717 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:32:23,880 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:32:23,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:32:23,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 1096 conjuncts, 82 conjunts are in the unsatisfiable core [2020-07-21 20:32:23,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:32:28,997 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 20:32:28,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:32:35,017 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 20:32:35,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1190455954] [2020-07-21 20:32:35,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:32:35,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82] total 122 [2020-07-21 20:32:35,018 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387938028] [2020-07-21 20:32:35,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2020-07-21 20:32:35,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:32:35,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2020-07-21 20:32:35,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3401, Invalid=11361, Unknown=0, NotChecked=0, Total=14762 [2020-07-21 20:32:35,020 INFO L87 Difference]: Start difference. First operand 334 states and 356 transitions. Second operand 122 states. [2020-07-21 20:32:41,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:32:41,674 INFO L93 Difference]: Finished difference Result 663 states and 805 transitions. [2020-07-21 20:32:41,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-21 20:32:41,674 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 407 [2020-07-21 20:32:41,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:32:41,676 INFO L225 Difference]: With dead ends: 663 [2020-07-21 20:32:41,676 INFO L226 Difference]: Without dead ends: 496 [2020-07-21 20:32:41,678 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 853 GetRequests, 653 SyntacticMatches, 40 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6981 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=6721, Invalid=19361, Unknown=0, NotChecked=0, Total=26082 [2020-07-21 20:32:41,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2020-07-21 20:32:41,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 336. [2020-07-21 20:32:41,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 336 states. [2020-07-21 20:32:41,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 358 transitions. [2020-07-21 20:32:41,692 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 358 transitions. Word has length 407 [2020-07-21 20:32:41,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:32:41,692 INFO L479 AbstractCegarLoop]: Abstraction has 336 states and 358 transitions. [2020-07-21 20:32:41,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 122 states. [2020-07-21 20:32:41,692 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 358 transitions. [2020-07-21 20:32:41,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2020-07-21 20:32:41,694 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:32:41,694 INFO L422 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:32:41,895 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:32:41,895 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:32:41,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:32:41,896 INFO L82 PathProgramCache]: Analyzing trace with hash -702901346, now seen corresponding path program 59 times [2020-07-21 20:32:41,896 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:32:41,897 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1607922279] [2020-07-21 20:32:41,897 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:32:42,060 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:32:42,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:32:42,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 1106 conjuncts, 83 conjunts are in the unsatisfiable core [2020-07-21 20:32:42,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:32:43,686 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:32:43,871 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 20:32:43,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:32:43,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:32:47,267 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 20:32:47,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1607922279] [2020-07-21 20:32:47,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:32:47,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45] total 46 [2020-07-21 20:32:47,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136196455] [2020-07-21 20:32:47,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-21 20:32:47,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:32:47,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-21 20:32:47,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=950, Invalid=1120, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 20:32:47,269 INFO L87 Difference]: Start difference. First operand 336 states and 358 transitions. Second operand 46 states. [2020-07-21 20:32:48,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:32:48,081 INFO L93 Difference]: Finished difference Result 355 states and 379 transitions. [2020-07-21 20:32:48,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-21 20:32:48,083 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 409 [2020-07-21 20:32:48,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:32:48,085 INFO L225 Difference]: With dead ends: 355 [2020-07-21 20:32:48,085 INFO L226 Difference]: Without dead ends: 353 [2020-07-21 20:32:48,085 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 693 SyntacticMatches, 80 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1879 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=954, Invalid=1208, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 20:32:48,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-21 20:32:48,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 348. [2020-07-21 20:32:48,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-21 20:32:48,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 371 transitions. [2020-07-21 20:32:48,115 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 371 transitions. Word has length 409 [2020-07-21 20:32:48,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:32:48,115 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 371 transitions. [2020-07-21 20:32:48,115 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-07-21 20:32:48,115 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 371 transitions. [2020-07-21 20:32:48,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2020-07-21 20:32:48,118 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:32:48,118 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 41, 41, 41, 41, 41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:32:48,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:32:48,323 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:32:48,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:32:48,324 INFO L82 PathProgramCache]: Analyzing trace with hash 524990848, now seen corresponding path program 60 times [2020-07-21 20:32:48,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:32:48,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321016529] [2020-07-21 20:32:48,324 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:32:48,493 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:32:48,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:32:48,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 1140 conjuncts, 84 conjunts are in the unsatisfiable core [2020-07-21 20:32:48,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:32:53,945 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3600 proven. 1640 refuted. 0 times theorem prover too weak. 3124 trivial. 0 not checked. [2020-07-21 20:32:53,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:33:00,510 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3442 proven. 1640 refuted. 0 times theorem prover too weak. 3282 trivial. 0 not checked. [2020-07-21 20:33:00,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321016529] [2020-07-21 20:33:00,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:33:00,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84] total 125 [2020-07-21 20:33:00,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429935611] [2020-07-21 20:33:00,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 125 states [2020-07-21 20:33:00,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:33:00,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2020-07-21 20:33:00,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3568, Invalid=11932, Unknown=0, NotChecked=0, Total=15500 [2020-07-21 20:33:00,513 INFO L87 Difference]: Start difference. First operand 348 states and 371 transitions. Second operand 125 states. [2020-07-21 20:33:07,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:33:07,615 INFO L93 Difference]: Finished difference Result 691 states and 837 transitions. [2020-07-21 20:33:07,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-21 20:33:07,616 INFO L78 Accepts]: Start accepts. Automaton has 125 states. Word has length 425 [2020-07-21 20:33:07,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:33:07,618 INFO L225 Difference]: With dead ends: 691 [2020-07-21 20:33:07,618 INFO L226 Difference]: Without dead ends: 514 [2020-07-21 20:33:07,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 890 GetRequests, 685 SyntacticMatches, 41 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7340 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=7053, Invalid=20337, Unknown=0, NotChecked=0, Total=27390 [2020-07-21 20:33:07,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-21 20:33:07,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 350. [2020-07-21 20:33:07,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2020-07-21 20:33:07,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 373 transitions. [2020-07-21 20:33:07,633 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 373 transitions. Word has length 425 [2020-07-21 20:33:07,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:33:07,633 INFO L479 AbstractCegarLoop]: Abstraction has 350 states and 373 transitions. [2020-07-21 20:33:07,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 125 states. [2020-07-21 20:33:07,633 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 373 transitions. [2020-07-21 20:33:07,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 428 [2020-07-21 20:33:07,635 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:33:07,635 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:33:07,836 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:33:07,836 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:33:07,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:33:07,837 INFO L82 PathProgramCache]: Analyzing trace with hash -2129659355, now seen corresponding path program 61 times [2020-07-21 20:33:07,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:33:07,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [933880711] [2020-07-21 20:33:07,838 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:33:08,007 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:33:08,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:33:08,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 1150 conjuncts, 86 conjunts are in the unsatisfiable core [2020-07-21 20:33:08,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:33:14,019 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 20:33:14,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:33:21,213 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 20:33:21,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [933880711] [2020-07-21 20:33:21,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:33:21,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86] total 128 [2020-07-21 20:33:21,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084640040] [2020-07-21 20:33:21,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2020-07-21 20:33:21,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:33:21,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2020-07-21 20:33:21,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3739, Invalid=12517, Unknown=0, NotChecked=0, Total=16256 [2020-07-21 20:33:21,217 INFO L87 Difference]: Start difference. First operand 350 states and 373 transitions. Second operand 128 states. [2020-07-21 20:33:29,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:33:29,285 INFO L93 Difference]: Finished difference Result 695 states and 844 transitions. [2020-07-21 20:33:29,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-21 20:33:29,285 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 427 [2020-07-21 20:33:29,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:33:29,287 INFO L225 Difference]: With dead ends: 695 [2020-07-21 20:33:29,288 INFO L226 Difference]: Without dead ends: 520 [2020-07-21 20:33:29,289 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 895 GetRequests, 685 SyntacticMatches, 42 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7708 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=7393, Invalid=21337, Unknown=0, NotChecked=0, Total=28730 [2020-07-21 20:33:29,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2020-07-21 20:33:29,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 352. [2020-07-21 20:33:29,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-21 20:33:29,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 375 transitions. [2020-07-21 20:33:29,302 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 375 transitions. Word has length 427 [2020-07-21 20:33:29,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:33:29,302 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 375 transitions. [2020-07-21 20:33:29,302 INFO L480 AbstractCegarLoop]: Interpolant automaton has 128 states. [2020-07-21 20:33:29,302 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 375 transitions. [2020-07-21 20:33:29,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 430 [2020-07-21 20:33:29,304 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:33:29,304 INFO L422 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:33:29,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:33:29,507 INFO L427 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:33:29,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:33:29,508 INFO L82 PathProgramCache]: Analyzing trace with hash -2037930614, now seen corresponding path program 62 times [2020-07-21 20:33:29,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:33:29,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [558931080] [2020-07-21 20:33:29,509 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:33:29,684 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:33:29,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:33:29,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 1160 conjuncts, 87 conjunts are in the unsatisfiable core [2020-07-21 20:33:29,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:33:31,664 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:33:31,865 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 20:33:31,865 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:33:31,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:33:36,376 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 20:33:36,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [558931080] [2020-07-21 20:33:36,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:33:36,377 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47] total 48 [2020-07-21 20:33:36,377 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154031464] [2020-07-21 20:33:36,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 20:33:36,378 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:33:36,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 20:33:36,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1039, Invalid=1217, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 20:33:36,378 INFO L87 Difference]: Start difference. First operand 352 states and 375 transitions. Second operand 48 states. [2020-07-21 20:33:37,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:33:37,326 INFO L93 Difference]: Finished difference Result 371 states and 396 transitions. [2020-07-21 20:33:37,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 20:33:37,328 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 429 [2020-07-21 20:33:37,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:33:37,331 INFO L225 Difference]: With dead ends: 371 [2020-07-21 20:33:37,331 INFO L226 Difference]: Without dead ends: 369 [2020-07-21 20:33:37,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 858 GetRequests, 727 SyntacticMatches, 84 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2057 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=1043, Invalid=1309, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 20:33:37,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-21 20:33:37,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 364. [2020-07-21 20:33:37,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2020-07-21 20:33:37,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 388 transitions. [2020-07-21 20:33:37,345 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 388 transitions. Word has length 429 [2020-07-21 20:33:37,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:33:37,345 INFO L479 AbstractCegarLoop]: Abstraction has 364 states and 388 transitions. [2020-07-21 20:33:37,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 20:33:37,345 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 388 transitions. [2020-07-21 20:33:37,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 446 [2020-07-21 20:33:37,348 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:33:37,348 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 43, 43, 43, 43, 43, 43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:33:37,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:33:37,549 INFO L427 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:33:37,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:33:37,550 INFO L82 PathProgramCache]: Analyzing trace with hash -99716244, now seen corresponding path program 63 times [2020-07-21 20:33:37,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:33:37,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [261924685] [2020-07-21 20:33:37,551 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:33:37,727 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:33:37,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:33:37,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 1194 conjuncts, 88 conjunts are in the unsatisfiable core [2020-07-21 20:33:37,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:33:44,334 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3948 proven. 1806 refuted. 0 times theorem prover too weak. 3448 trivial. 0 not checked. [2020-07-21 20:33:44,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:33:52,342 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3782 proven. 1806 refuted. 0 times theorem prover too weak. 3614 trivial. 0 not checked. [2020-07-21 20:33:52,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [261924685] [2020-07-21 20:33:52,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:33:52,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88] total 131 [2020-07-21 20:33:52,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548604230] [2020-07-21 20:33:52,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2020-07-21 20:33:52,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:33:52,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2020-07-21 20:33:52,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3914, Invalid=13116, Unknown=0, NotChecked=0, Total=17030 [2020-07-21 20:33:52,345 INFO L87 Difference]: Start difference. First operand 364 states and 388 transitions. Second operand 131 states. [2020-07-21 20:34:00,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:34:00,728 INFO L93 Difference]: Finished difference Result 723 states and 876 transitions. [2020-07-21 20:34:00,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-21 20:34:00,728 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 445 [2020-07-21 20:34:00,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:34:00,730 INFO L225 Difference]: With dead ends: 723 [2020-07-21 20:34:00,730 INFO L226 Difference]: Without dead ends: 538 [2020-07-21 20:34:00,732 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 717 SyntacticMatches, 43 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8085 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=7741, Invalid=22361, Unknown=0, NotChecked=0, Total=30102 [2020-07-21 20:34:00,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2020-07-21 20:34:00,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 366. [2020-07-21 20:34:00,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 366 states. [2020-07-21 20:34:00,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 390 transitions. [2020-07-21 20:34:00,747 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 390 transitions. Word has length 445 [2020-07-21 20:34:00,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:34:00,747 INFO L479 AbstractCegarLoop]: Abstraction has 366 states and 390 transitions. [2020-07-21 20:34:00,747 INFO L480 AbstractCegarLoop]: Interpolant automaton has 131 states. [2020-07-21 20:34:00,747 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 390 transitions. [2020-07-21 20:34:00,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2020-07-21 20:34:00,749 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:34:00,750 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 44, 43, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:34:00,950 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:34:00,951 INFO L427 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:34:00,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:34:00,951 INFO L82 PathProgramCache]: Analyzing trace with hash 592048017, now seen corresponding path program 64 times [2020-07-21 20:34:00,952 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:34:00,952 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [838285648] [2020-07-21 20:34:00,952 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:34:01,130 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:34:01,130 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:34:01,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 1204 conjuncts, 90 conjunts are in the unsatisfiable core [2020-07-21 20:34:01,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:34:08,798 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 20:34:08,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:34:17,732 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 20:34:17,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [838285648] [2020-07-21 20:34:17,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:34:17,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90] total 134 [2020-07-21 20:34:17,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718220648] [2020-07-21 20:34:17,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2020-07-21 20:34:17,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:34:17,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2020-07-21 20:34:17,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 20:34:17,735 INFO L87 Difference]: Start difference. First operand 366 states and 390 transitions. Second operand 134 states. [2020-07-21 20:34:26,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:34:26,609 INFO L93 Difference]: Finished difference Result 727 states and 883 transitions. [2020-07-21 20:34:26,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-07-21 20:34:26,610 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 447 [2020-07-21 20:34:26,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:34:26,612 INFO L225 Difference]: With dead ends: 727 [2020-07-21 20:34:26,612 INFO L226 Difference]: Without dead ends: 544 [2020-07-21 20:34:26,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 937 GetRequests, 717 SyntacticMatches, 44 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8471 ImplicationChecksByTransitivity, 20.0s TimeCoverageRelationStatistics Valid=8097, Invalid=23409, Unknown=0, NotChecked=0, Total=31506 [2020-07-21 20:34:26,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2020-07-21 20:34:26,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 368. [2020-07-21 20:34:26,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-21 20:34:26,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 392 transitions. [2020-07-21 20:34:26,632 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 392 transitions. Word has length 447 [2020-07-21 20:34:26,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:34:26,632 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 392 transitions. [2020-07-21 20:34:26,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 134 states. [2020-07-21 20:34:26,632 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 392 transitions. [2020-07-21 20:34:26,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-21 20:34:26,634 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:34:26,634 INFO L422 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 44, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:34:26,835 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:34:26,835 INFO L427 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:34:26,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:34:26,836 INFO L82 PathProgramCache]: Analyzing trace with hash -342428042, now seen corresponding path program 65 times [2020-07-21 20:34:26,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:34:26,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1692992844] [2020-07-21 20:34:26,837 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 20:34:27,017 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:34:27,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:34:27,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 1214 conjuncts, 91 conjunts are in the unsatisfiable core [2020-07-21 20:34:27,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:34:29,512 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:34:29,777 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 20:34:29,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:34:29,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:34:35,097 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 20:34:35,098 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1692992844] [2020-07-21 20:34:35,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:34:35,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 50 [2020-07-21 20:34:35,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131161759] [2020-07-21 20:34:35,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 20:34:35,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:34:35,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 20:34:35,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1132, Invalid=1318, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 20:34:35,099 INFO L87 Difference]: Start difference. First operand 368 states and 392 transitions. Second operand 50 states. [2020-07-21 20:34:36,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:34:36,297 INFO L93 Difference]: Finished difference Result 387 states and 413 transitions. [2020-07-21 20:34:36,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 20:34:36,299 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 449 [2020-07-21 20:34:36,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:34:36,302 INFO L225 Difference]: With dead ends: 387 [2020-07-21 20:34:36,302 INFO L226 Difference]: Without dead ends: 385 [2020-07-21 20:34:36,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 898 GetRequests, 761 SyntacticMatches, 88 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2243 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=1136, Invalid=1414, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 20:34:36,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2020-07-21 20:34:36,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 380. [2020-07-21 20:34:36,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 380 states. [2020-07-21 20:34:36,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 405 transitions. [2020-07-21 20:34:36,317 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 405 transitions. Word has length 449 [2020-07-21 20:34:36,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:34:36,317 INFO L479 AbstractCegarLoop]: Abstraction has 380 states and 405 transitions. [2020-07-21 20:34:36,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 20:34:36,318 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 405 transitions. [2020-07-21 20:34:36,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-21 20:34:36,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:34:36,320 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 45, 45, 45, 45, 45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:34:36,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:34:36,521 INFO L427 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:34:36,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:34:36,521 INFO L82 PathProgramCache]: Analyzing trace with hash -753505192, now seen corresponding path program 66 times [2020-07-21 20:34:36,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:34:36,522 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2028390290] [2020-07-21 20:34:36,522 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:34:36,705 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:34:36,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:34:36,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 1248 conjuncts, 92 conjunts are in the unsatisfiable core [2020-07-21 20:34:36,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:34:45,102 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4312 proven. 1980 refuted. 0 times theorem prover too weak. 3788 trivial. 0 not checked. [2020-07-21 20:34:45,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:34:54,952 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4138 proven. 1980 refuted. 0 times theorem prover too weak. 3962 trivial. 0 not checked. [2020-07-21 20:34:54,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2028390290] [2020-07-21 20:34:54,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:34:54,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92] total 137 [2020-07-21 20:34:54,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643256719] [2020-07-21 20:34:54,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 137 states [2020-07-21 20:34:54,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:34:54,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2020-07-21 20:34:54,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4276, Invalid=14356, Unknown=0, NotChecked=0, Total=18632 [2020-07-21 20:34:54,956 INFO L87 Difference]: Start difference. First operand 380 states and 405 transitions. Second operand 137 states. [2020-07-21 20:35:06,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:35:06,472 INFO L93 Difference]: Finished difference Result 755 states and 915 transitions. [2020-07-21 20:35:06,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2020-07-21 20:35:06,472 INFO L78 Accepts]: Start accepts. Automaton has 137 states. Word has length 465 [2020-07-21 20:35:06,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:35:06,474 INFO L225 Difference]: With dead ends: 755 [2020-07-21 20:35:06,474 INFO L226 Difference]: Without dead ends: 562 [2020-07-21 20:35:06,477 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 974 GetRequests, 749 SyntacticMatches, 45 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8866 ImplicationChecksByTransitivity, 22.2s TimeCoverageRelationStatistics Valid=8461, Invalid=24481, Unknown=0, NotChecked=0, Total=32942 [2020-07-21 20:35:06,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2020-07-21 20:35:06,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 382. [2020-07-21 20:35:06,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 382 states. [2020-07-21 20:35:06,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 407 transitions. [2020-07-21 20:35:06,512 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 407 transitions. Word has length 465 [2020-07-21 20:35:06,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:35:06,512 INFO L479 AbstractCegarLoop]: Abstraction has 382 states and 407 transitions. [2020-07-21 20:35:06,512 INFO L480 AbstractCegarLoop]: Interpolant automaton has 137 states. [2020-07-21 20:35:06,513 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 407 transitions. [2020-07-21 20:35:06,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-21 20:35:06,515 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:06,515 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 45, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:06,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:06,716 INFO L427 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:06,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:06,717 INFO L82 PathProgramCache]: Analyzing trace with hash -103324675, now seen corresponding path program 67 times [2020-07-21 20:35:06,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:06,717 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [341692582] [2020-07-21 20:35:06,718 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:06,910 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:06,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:06,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 1258 conjuncts, 94 conjunts are in the unsatisfiable core [2020-07-21 20:35:06,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:16,038 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 20:35:16,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:35:26,762 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 20:35:26,762 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [341692582] [2020-07-21 20:35:26,762 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:35:26,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94] total 140 [2020-07-21 20:35:26,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831872852] [2020-07-21 20:35:26,763 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2020-07-21 20:35:26,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:35:26,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2020-07-21 20:35:26,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4463, Invalid=14997, Unknown=0, NotChecked=0, Total=19460 [2020-07-21 20:35:26,765 INFO L87 Difference]: Start difference. First operand 382 states and 407 transitions. Second operand 140 states. [2020-07-21 20:35:37,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:35:37,928 INFO L93 Difference]: Finished difference Result 759 states and 922 transitions. [2020-07-21 20:35:37,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-21 20:35:37,928 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 467 [2020-07-21 20:35:37,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:35:37,930 INFO L225 Difference]: With dead ends: 759 [2020-07-21 20:35:37,930 INFO L226 Difference]: Without dead ends: 568 [2020-07-21 20:35:37,933 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 749 SyntacticMatches, 46 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9270 ImplicationChecksByTransitivity, 23.8s TimeCoverageRelationStatistics Valid=8833, Invalid=25577, Unknown=0, NotChecked=0, Total=34410 [2020-07-21 20:35:37,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2020-07-21 20:35:37,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 384. [2020-07-21 20:35:37,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 384 states. [2020-07-21 20:35:37,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 409 transitions. [2020-07-21 20:35:37,947 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 409 transitions. Word has length 467 [2020-07-21 20:35:37,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:35:37,947 INFO L479 AbstractCegarLoop]: Abstraction has 384 states and 409 transitions. [2020-07-21 20:35:37,947 INFO L480 AbstractCegarLoop]: Interpolant automaton has 140 states. [2020-07-21 20:35:37,947 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 409 transitions. [2020-07-21 20:35:37,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-07-21 20:35:37,949 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:37,949 INFO L422 BasicCegarLoop]: trace histogram [47, 46, 46, 46, 46, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:38,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:38,151 INFO L427 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:38,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:38,152 INFO L82 PathProgramCache]: Analyzing trace with hash 1949894242, now seen corresponding path program 68 times [2020-07-21 20:35:38,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:38,152 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [357501548] [2020-07-21 20:35:38,152 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:38,323 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:38,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:38,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 1268 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-21 20:35:38,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:41,332 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:35:41,583 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 20:35:41,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:35:41,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:35:47,766 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 20:35:47,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [357501548] [2020-07-21 20:35:47,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:35:47,766 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51] total 52 [2020-07-21 20:35:47,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084151394] [2020-07-21 20:35:47,767 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-21 20:35:47,767 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:35:47,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-21 20:35:47,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1229, Invalid=1423, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 20:35:47,768 INFO L87 Difference]: Start difference. First operand 384 states and 409 transitions. Second operand 52 states. [2020-07-21 20:35:49,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:35:49,047 INFO L93 Difference]: Finished difference Result 403 states and 430 transitions. [2020-07-21 20:35:49,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-21 20:35:49,050 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 469 [2020-07-21 20:35:49,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:35:49,053 INFO L225 Difference]: With dead ends: 403 [2020-07-21 20:35:49,053 INFO L226 Difference]: Without dead ends: 401 [2020-07-21 20:35:49,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 938 GetRequests, 795 SyntacticMatches, 92 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2437 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=1233, Invalid=1523, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 20:35:49,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2020-07-21 20:35:49,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 396. [2020-07-21 20:35:49,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 396 states. [2020-07-21 20:35:49,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 422 transitions. [2020-07-21 20:35:49,068 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 422 transitions. Word has length 469 [2020-07-21 20:35:49,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:35:49,068 INFO L479 AbstractCegarLoop]: Abstraction has 396 states and 422 transitions. [2020-07-21 20:35:49,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-21 20:35:49,069 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 422 transitions. [2020-07-21 20:35:49,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-21 20:35:49,072 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:49,072 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 47, 47, 47, 47, 47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:49,285 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:49,285 INFO L427 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:49,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:49,286 INFO L82 PathProgramCache]: Analyzing trace with hash 676537412, now seen corresponding path program 69 times [2020-07-21 20:35:49,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:49,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1992154090] [2020-07-21 20:35:49,287 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:49,476 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:49,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:49,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 1302 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-21 20:35:49,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:58,563 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4692 proven. 2162 refuted. 0 times theorem prover too weak. 4144 trivial. 0 not checked. [2020-07-21 20:35:58,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:36:09,664 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4510 proven. 2162 refuted. 0 times theorem prover too weak. 4326 trivial. 0 not checked. [2020-07-21 20:36:09,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1992154090] [2020-07-21 20:36:09,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:36:09,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96] total 143 [2020-07-21 20:36:09,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092634245] [2020-07-21 20:36:09,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 143 states [2020-07-21 20:36:09,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:36:09,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2020-07-21 20:36:09,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4654, Invalid=15652, Unknown=0, NotChecked=0, Total=20306 [2020-07-21 20:36:09,667 INFO L87 Difference]: Start difference. First operand 396 states and 422 transitions. Second operand 143 states. [2020-07-21 20:36:21,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:36:21,811 INFO L93 Difference]: Finished difference Result 787 states and 954 transitions. [2020-07-21 20:36:21,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-21 20:36:21,811 INFO L78 Accepts]: Start accepts. Automaton has 143 states. Word has length 485 [2020-07-21 20:36:21,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:36:21,813 INFO L225 Difference]: With dead ends: 787 [2020-07-21 20:36:21,813 INFO L226 Difference]: Without dead ends: 586 [2020-07-21 20:36:21,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1016 GetRequests, 781 SyntacticMatches, 47 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9683 ImplicationChecksByTransitivity, 24.5s TimeCoverageRelationStatistics Valid=9213, Invalid=26697, Unknown=0, NotChecked=0, Total=35910 [2020-07-21 20:36:21,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-07-21 20:36:21,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 398. [2020-07-21 20:36:21,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 398 states. [2020-07-21 20:36:21,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 424 transitions. [2020-07-21 20:36:21,830 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 424 transitions. Word has length 485 [2020-07-21 20:36:21,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:36:21,830 INFO L479 AbstractCegarLoop]: Abstraction has 398 states and 424 transitions. [2020-07-21 20:36:21,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 143 states. [2020-07-21 20:36:21,830 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 424 transitions. [2020-07-21 20:36:21,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-21 20:36:21,832 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:36:21,832 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 48, 47, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:36:22,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:36:22,033 INFO L427 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:36:22,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:36:22,034 INFO L82 PathProgramCache]: Analyzing trace with hash 579393385, now seen corresponding path program 70 times [2020-07-21 20:36:22,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:36:22,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [794734258] [2020-07-21 20:36:22,035 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:36:22,223 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:36:22,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:36:22,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 1312 conjuncts, 98 conjunts are in the unsatisfiable core [2020-07-21 20:36:22,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:36:32,807 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 20:36:32,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:36:45,816 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 20:36:45,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [794734258] [2020-07-21 20:36:45,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:36:45,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98] total 146 [2020-07-21 20:36:45,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084858198] [2020-07-21 20:36:45,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2020-07-21 20:36:45,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:36:45,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2020-07-21 20:36:45,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4849, Invalid=16321, Unknown=0, NotChecked=0, Total=21170 [2020-07-21 20:36:45,819 INFO L87 Difference]: Start difference. First operand 398 states and 424 transitions. Second operand 146 states. [2020-07-21 20:36:59,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:36:59,813 INFO L93 Difference]: Finished difference Result 791 states and 961 transitions. [2020-07-21 20:36:59,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2020-07-21 20:36:59,813 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 487 [2020-07-21 20:36:59,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:36:59,816 INFO L225 Difference]: With dead ends: 791 [2020-07-21 20:36:59,816 INFO L226 Difference]: Without dead ends: 592 [2020-07-21 20:36:59,819 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 781 SyntacticMatches, 48 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10105 ImplicationChecksByTransitivity, 28.6s TimeCoverageRelationStatistics Valid=9601, Invalid=27841, Unknown=0, NotChecked=0, Total=37442 [2020-07-21 20:36:59,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2020-07-21 20:36:59,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 400. [2020-07-21 20:36:59,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-21 20:36:59,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 426 transitions. [2020-07-21 20:36:59,837 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 426 transitions. Word has length 487 [2020-07-21 20:36:59,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:36:59,837 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 426 transitions. [2020-07-21 20:36:59,837 INFO L480 AbstractCegarLoop]: Interpolant automaton has 146 states. [2020-07-21 20:36:59,837 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 426 transitions. [2020-07-21 20:36:59,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-21 20:36:59,839 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:36:59,839 INFO L422 BasicCegarLoop]: trace histogram [49, 48, 48, 48, 48, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:37:00,040 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:37:00,040 INFO L427 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:37:00,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:37:00,041 INFO L82 PathProgramCache]: Analyzing trace with hash 1713263950, now seen corresponding path program 71 times [2020-07-21 20:37:00,042 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:37:00,042 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [316672134] [2020-07-21 20:37:00,042 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:37:00,234 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:37:00,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:37:00,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 1322 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-21 20:37:00,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:37:03,879 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:37:04,174 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 20:37:04,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:37:04,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:37:11,899 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 20:37:11,899 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [316672134] [2020-07-21 20:37:11,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:37:11,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 54 [2020-07-21 20:37:11,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857578786] [2020-07-21 20:37:11,900 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-07-21 20:37:11,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:37:11,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-07-21 20:37:11,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1330, Invalid=1532, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 20:37:11,901 INFO L87 Difference]: Start difference. First operand 400 states and 426 transitions. Second operand 54 states. [2020-07-21 20:37:13,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:37:13,497 INFO L93 Difference]: Finished difference Result 419 states and 447 transitions. [2020-07-21 20:37:13,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 20:37:13,500 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 489 [2020-07-21 20:37:13,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:37:13,503 INFO L225 Difference]: With dead ends: 419 [2020-07-21 20:37:13,503 INFO L226 Difference]: Without dead ends: 417 [2020-07-21 20:37:13,504 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 978 GetRequests, 829 SyntacticMatches, 96 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2639 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=1334, Invalid=1636, Unknown=0, NotChecked=0, Total=2970 [2020-07-21 20:37:13,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2020-07-21 20:37:13,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 412. [2020-07-21 20:37:13,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 412 states. [2020-07-21 20:37:13,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 439 transitions. [2020-07-21 20:37:13,520 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 439 transitions. Word has length 489 [2020-07-21 20:37:13,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:37:13,521 INFO L479 AbstractCegarLoop]: Abstraction has 412 states and 439 transitions. [2020-07-21 20:37:13,521 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-07-21 20:37:13,521 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 439 transitions. [2020-07-21 20:37:13,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-21 20:37:13,523 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:37:13,523 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 49, 49, 49, 49, 49, 49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:37:13,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:37:13,724 INFO L427 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:37:13,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:37:13,725 INFO L82 PathProgramCache]: Analyzing trace with hash -831186128, now seen corresponding path program 72 times [2020-07-21 20:37:13,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:37:13,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2145987048] [2020-07-21 20:37:13,726 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:37:13,924 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:37:13,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:37:13,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 1356 conjuncts, 100 conjunts are in the unsatisfiable core [2020-07-21 20:37:13,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:37:26,117 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 5088 proven. 2352 refuted. 0 times theorem prover too weak. 4516 trivial. 0 not checked. [2020-07-21 20:37:26,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:37:40,826 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 4898 proven. 2352 refuted. 0 times theorem prover too weak. 4706 trivial. 0 not checked. [2020-07-21 20:37:40,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2145987048] [2020-07-21 20:37:40,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:37:40,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100] total 149 [2020-07-21 20:37:40,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028407105] [2020-07-21 20:37:40,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 149 states [2020-07-21 20:37:40,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:37:40,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2020-07-21 20:37:40,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5048, Invalid=17004, Unknown=0, NotChecked=0, Total=22052 [2020-07-21 20:37:40,830 INFO L87 Difference]: Start difference. First operand 412 states and 439 transitions. Second operand 149 states. [2020-07-21 20:37:57,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:37:57,901 INFO L93 Difference]: Finished difference Result 819 states and 993 transitions. [2020-07-21 20:37:57,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-21 20:37:57,901 INFO L78 Accepts]: Start accepts. Automaton has 149 states. Word has length 505 [2020-07-21 20:37:57,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:37:57,904 INFO L225 Difference]: With dead ends: 819 [2020-07-21 20:37:57,904 INFO L226 Difference]: Without dead ends: 610 [2020-07-21 20:37:57,906 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1058 GetRequests, 813 SyntacticMatches, 49 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10536 ImplicationChecksByTransitivity, 33.1s TimeCoverageRelationStatistics Valid=9997, Invalid=29009, Unknown=0, NotChecked=0, Total=39006 [2020-07-21 20:37:57,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2020-07-21 20:37:57,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 414. [2020-07-21 20:37:57,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2020-07-21 20:37:57,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 441 transitions. [2020-07-21 20:37:57,923 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 441 transitions. Word has length 505 [2020-07-21 20:37:57,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:37:57,923 INFO L479 AbstractCegarLoop]: Abstraction has 414 states and 441 transitions. [2020-07-21 20:37:57,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 149 states. [2020-07-21 20:37:57,923 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 441 transitions. [2020-07-21 20:37:57,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 20:37:57,925 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:37:57,926 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 50, 49, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:37:58,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:37:58,126 INFO L427 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:37:58,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:37:58,127 INFO L82 PathProgramCache]: Analyzing trace with hash 1643039189, now seen corresponding path program 73 times [2020-07-21 20:37:58,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:37:58,128 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [62818849] [2020-07-21 20:37:58,128 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:37:58,327 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:37:58,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:37:58,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 1366 conjuncts, 102 conjunts are in the unsatisfiable core [2020-07-21 20:37:58,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:38:12,948 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 20:38:12,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:38:30,989 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 20:38:30,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [62818849] [2020-07-21 20:38:30,990 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:38:30,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102] total 152 [2020-07-21 20:38:30,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282203561] [2020-07-21 20:38:30,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2020-07-21 20:38:30,991 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:38:30,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2020-07-21 20:38:30,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5251, Invalid=17701, Unknown=0, NotChecked=0, Total=22952 [2020-07-21 20:38:30,993 INFO L87 Difference]: Start difference. First operand 414 states and 441 transitions. Second operand 152 states. [2020-07-21 20:38:51,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:38:51,721 INFO L93 Difference]: Finished difference Result 823 states and 1000 transitions. [2020-07-21 20:38:51,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2020-07-21 20:38:51,721 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 507 [2020-07-21 20:38:51,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:38:51,725 INFO L225 Difference]: With dead ends: 823 [2020-07-21 20:38:51,725 INFO L226 Difference]: Without dead ends: 616 [2020-07-21 20:38:51,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1063 GetRequests, 813 SyntacticMatches, 50 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10976 ImplicationChecksByTransitivity, 40.3s TimeCoverageRelationStatistics Valid=10401, Invalid=30201, Unknown=0, NotChecked=0, Total=40602 [2020-07-21 20:38:51,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2020-07-21 20:38:51,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 416. [2020-07-21 20:38:51,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 416 states. [2020-07-21 20:38:51,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 443 transitions. [2020-07-21 20:38:51,757 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 443 transitions. Word has length 507 [2020-07-21 20:38:51,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:38:51,757 INFO L479 AbstractCegarLoop]: Abstraction has 416 states and 443 transitions. [2020-07-21 20:38:51,757 INFO L480 AbstractCegarLoop]: Interpolant automaton has 152 states. [2020-07-21 20:38:51,757 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 443 transitions. [2020-07-21 20:38:51,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 510 [2020-07-21 20:38:51,760 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:38:51,760 INFO L422 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 50, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:38:51,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:38:51,961 INFO L427 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:38:51,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:38:51,962 INFO L82 PathProgramCache]: Analyzing trace with hash -38313158, now seen corresponding path program 74 times [2020-07-21 20:38:51,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:38:51,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [680836805] [2020-07-21 20:38:51,963 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:38:52,200 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:38:52,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:38:52,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 1376 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-21 20:38:52,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:38:57,857 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 20:38:58,229 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 20:38:58,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:38:58,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:39:10,352 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 20:39:10,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [680836805] [2020-07-21 20:39:10,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:39:10,353 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55] total 56 [2020-07-21 20:39:10,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928181961] [2020-07-21 20:39:10,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-21 20:39:10,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:39:10,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-21 20:39:10,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1435, Invalid=1645, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 20:39:10,354 INFO L87 Difference]: Start difference. First operand 416 states and 443 transitions. Second operand 56 states. [2020-07-21 20:39:13,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:39:13,166 INFO L93 Difference]: Finished difference Result 435 states and 464 transitions. [2020-07-21 20:39:13,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-21 20:39:13,172 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 509 [2020-07-21 20:39:13,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:39:13,175 INFO L225 Difference]: With dead ends: 435 [2020-07-21 20:39:13,176 INFO L226 Difference]: Without dead ends: 433 [2020-07-21 20:39:13,176 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1018 GetRequests, 863 SyntacticMatches, 100 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2849 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=1439, Invalid=1753, Unknown=0, NotChecked=0, Total=3192 [2020-07-21 20:39:13,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2020-07-21 20:39:13,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 428. [2020-07-21 20:39:13,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 428 states. [2020-07-21 20:39:13,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 456 transitions. [2020-07-21 20:39:13,201 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 456 transitions. Word has length 509 [2020-07-21 20:39:13,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:39:13,202 INFO L479 AbstractCegarLoop]: Abstraction has 428 states and 456 transitions. [2020-07-21 20:39:13,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-21 20:39:13,202 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 456 transitions. [2020-07-21 20:39:13,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 526 [2020-07-21 20:39:13,205 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:39:13,205 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 52, 51, 51, 51, 51, 51, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:39:13,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:39:13,408 INFO L427 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:39:13,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:39:13,409 INFO L82 PathProgramCache]: Analyzing trace with hash 283955484, now seen corresponding path program 75 times [2020-07-21 20:39:13,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:39:13,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [203955814] [2020-07-21 20:39:13,410 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:39:13,626 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:39:13,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:39:13,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 1410 conjuncts, 104 conjunts are in the unsatisfiable core [2020-07-21 20:39:13,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:39:32,858 INFO L134 CoverageAnalysis]: Checked inductivity of 12954 backedges. 5500 proven. 2550 refuted. 0 times theorem prover too weak. 4904 trivial. 0 not checked. [2020-07-21 20:39:32,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:39:56,530 INFO L134 CoverageAnalysis]: Checked inductivity of 12954 backedges. 5302 proven. 2550 refuted. 0 times theorem prover too weak. 5102 trivial. 0 not checked. [2020-07-21 20:39:56,530 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [203955814] [2020-07-21 20:39:56,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:39:56,531 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 104] total 155 [2020-07-21 20:39:56,531 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662246645] [2020-07-21 20:39:56,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 155 states [2020-07-21 20:39:56,532 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:39:56,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2020-07-21 20:39:56,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5458, Invalid=18412, Unknown=0, NotChecked=0, Total=23870 [2020-07-21 20:39:56,534 INFO L87 Difference]: Start difference. First operand 428 states and 456 transitions. Second operand 155 states. [2020-07-21 20:40:23,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:40:23,030 INFO L93 Difference]: Finished difference Result 851 states and 1032 transitions. [2020-07-21 20:40:23,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2020-07-21 20:40:23,030 INFO L78 Accepts]: Start accepts. Automaton has 155 states. Word has length 525 [2020-07-21 20:40:23,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:40:23,034 INFO L225 Difference]: With dead ends: 851 [2020-07-21 20:40:23,034 INFO L226 Difference]: Without dead ends: 634 [2020-07-21 20:40:23,039 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1100 GetRequests, 845 SyntacticMatches, 51 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11425 ImplicationChecksByTransitivity, 52.9s TimeCoverageRelationStatistics Valid=10813, Invalid=31417, Unknown=0, NotChecked=0, Total=42230 [2020-07-21 20:40:23,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2020-07-21 20:40:23,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 430. [2020-07-21 20:40:23,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 430 states. [2020-07-21 20:40:23,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 458 transitions. [2020-07-21 20:40:23,077 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 458 transitions. Word has length 525 [2020-07-21 20:40:23,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:40:23,077 INFO L479 AbstractCegarLoop]: Abstraction has 430 states and 458 transitions. [2020-07-21 20:40:23,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 155 states. [2020-07-21 20:40:23,078 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 458 transitions. [2020-07-21 20:40:23,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 528 [2020-07-21 20:40:23,084 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:40:23,084 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 52, 52, 51, 51, 51, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:40:23,298 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:40:23,299 INFO L427 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:40:23,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:40:23,300 INFO L82 PathProgramCache]: Analyzing trace with hash 1129954113, now seen corresponding path program 76 times [2020-07-21 20:40:23,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:40:23,301 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [457183587] [2020-07-21 20:40:23,301 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:40:23,526 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:40:23,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:40:23,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 1420 conjuncts, 106 conjunts are in the unsatisfiable core [2020-07-21 20:40:23,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:40:45,925 INFO L134 CoverageAnalysis]: Checked inductivity of 13056 backedges. 5304 proven. 2652 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-21 20:40:45,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:41:13,213 INFO L134 CoverageAnalysis]: Checked inductivity of 13056 backedges. 5304 proven. 2652 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-21 20:41:13,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [457183587] [2020-07-21 20:41:13,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:41:13,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106] total 158 [2020-07-21 20:41:13,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063424450] [2020-07-21 20:41:13,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2020-07-21 20:41:13,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:41:13,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2020-07-21 20:41:13,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5669, Invalid=19137, Unknown=0, NotChecked=0, Total=24806 [2020-07-21 20:41:13,217 INFO L87 Difference]: Start difference. First operand 430 states and 458 transitions. Second operand 158 states. [2020-07-21 20:41:43,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:41:43,536 INFO L93 Difference]: Finished difference Result 855 states and 1039 transitions. [2020-07-21 20:41:43,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-07-21 20:41:43,537 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 527 [2020-07-21 20:41:43,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:41:43,541 INFO L225 Difference]: With dead ends: 855 [2020-07-21 20:41:43,541 INFO L226 Difference]: Without dead ends: 640 [2020-07-21 20:41:43,546 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1105 GetRequests, 845 SyntacticMatches, 52 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11883 ImplicationChecksByTransitivity, 61.4s TimeCoverageRelationStatistics Valid=11233, Invalid=32657, Unknown=0, NotChecked=0, Total=43890 [2020-07-21 20:41:43,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 640 states. [2020-07-21 20:41:43,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 640 to 432. [2020-07-21 20:41:43,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 432 states. [2020-07-21 20:41:43,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 460 transitions. [2020-07-21 20:41:43,581 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 460 transitions. Word has length 527 [2020-07-21 20:41:43,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:41:43,581 INFO L479 AbstractCegarLoop]: Abstraction has 432 states and 460 transitions. [2020-07-21 20:41:43,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 158 states. [2020-07-21 20:41:43,582 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 460 transitions. [2020-07-21 20:41:43,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 530 [2020-07-21 20:41:43,587 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:41:43,588 INFO L422 BasicCegarLoop]: trace histogram [53, 52, 52, 52, 52, 51, 51, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:41:43,801 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:41:43,801 INFO L427 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:41:43,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:41:43,802 INFO L82 PathProgramCache]: Analyzing trace with hash -1909149658, now seen corresponding path program 77 times [2020-07-21 20:41:43,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:41:43,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [909954526] [2020-07-21 20:41:43,803 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:41:44,047 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:41:44,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:41:44,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 1430 conjuncts, 107 conjunts are in the unsatisfiable core [2020-07-21 20:41:44,062 INFO L286 TraceCheckSpWp]: Computing forward predicates...