/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:53:14,338 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-20 17:53:14,355 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:53:14,356 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:53:14,357 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:53:14,359 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:53:14,361 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:53:14,362 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:53:14,363 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:53:14,364 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:53:14,365 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:53:14,366 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:53:14,367 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:53:14,368 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:53:14,369 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:53:14,370 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:53:14,372 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:53:14,374 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:53:14,376 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:53:14,377 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:53:14,379 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:53:14,379 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:53:14,382 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:53:14,391 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:53:14,392 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:53:14,393 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:53:14,394 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 17:53:14,409 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:53:14,409 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:53:14,415 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:53:14,415 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:53:14,416 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:53:14,416 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:53:14,416 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:53:14,416 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:53:14,417 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:53:14,417 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:53:14,417 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:53:14,417 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:53:14,417 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:53:14,418 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:53:14,419 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:53:14,419 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:53:14,420 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:53:14,420 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:53:14,420 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:53:14,420 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:53:14,420 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:53:14,421 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:53:14,421 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:53:14,421 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:53:14,421 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:53:14,421 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:53:14,422 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:14,422 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:53:14,422 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:53:14,423 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:53:14,750 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:53:14,767 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:53:14,771 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:53:14,773 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:53:14,773 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:53:14,774 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-20 17:53:14,843 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/27ac69cdf/d43d9e4ac54446b194162c2296520a4d/FLAG635ee6e81 [2020-07-20 17:53:15,340 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:53:15,342 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-20 17:53:15,352 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/27ac69cdf/d43d9e4ac54446b194162c2296520a4d/FLAG635ee6e81 [2020-07-20 17:53:15,626 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/27ac69cdf/d43d9e4ac54446b194162c2296520a4d [2020-07-20 17:53:15,636 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:53:15,639 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:53:15,641 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:53:15,641 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:53:15,645 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:53:15,646 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:53:15" (1/1) ... [2020-07-20 17:53:15,649 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@384e1e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:53:15, skipping insertion in model container [2020-07-20 17:53:15,649 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:53:15" (1/1) ... [2020-07-20 17:53:15,658 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:53:15,678 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:53:15,879 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:53:15,884 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:53:15,906 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:53:15,922 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:53:15,922 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:53:15 WrapperNode [2020-07-20 17:53:15,923 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:53:15,923 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:53:15,924 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:53:15,924 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:53:15,939 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:53:15" (1/1) ... [2020-07-20 17:53:15,940 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:53:15" (1/1) ... [2020-07-20 17:53:15,946 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:53:15" (1/1) ... [2020-07-20 17:53:15,947 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:53:15" (1/1) ... [2020-07-20 17:53:15,951 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:53:15" (1/1) ... [2020-07-20 17:53:16,037 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:53:15" (1/1) ... [2020-07-20 17:53:16,038 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:53:15" (1/1) ... [2020-07-20 17:53:16,040 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:53:16,041 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:53:16,041 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:53:16,041 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:53:16,042 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:53:15" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:53:16,109 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:53:16,109 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:53:16,109 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 17:53:16,109 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 17:53:16,110 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:53:16,110 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:53:16,110 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 17:53:16,110 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 17:53:16,110 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:53:16,110 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:53:16,111 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:53:16,111 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:53:16,112 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:53:16,343 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:53:16,343 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 17:53:16,348 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:53:16 BoogieIcfgContainer [2020-07-20 17:53:16,348 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:53:16,350 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:53:16,350 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:53:16,355 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:53:16,355 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:53:15" (1/3) ... [2020-07-20 17:53:16,356 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7be80215 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:53:16, skipping insertion in model container [2020-07-20 17:53:16,356 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:53:15" (2/3) ... [2020-07-20 17:53:16,357 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7be80215 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:53:16, skipping insertion in model container [2020-07-20 17:53:16,357 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:53:16" (3/3) ... [2020-07-20 17:53:16,359 INFO L109 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2020-07-20 17:53:16,377 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:53:16,389 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:53:16,409 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:53:16,441 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:53:16,441 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:53:16,441 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:53:16,441 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:53:16,441 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:53:16,442 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:53:16,442 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:53:16,442 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:53:16,474 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-20 17:53:16,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 17:53:16,491 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:16,496 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:53:16,497 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:16,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:16,505 INFO L82 PathProgramCache]: Analyzing trace with hash 317368997, now seen corresponding path program 1 times [2020-07-20 17:53:16,518 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:16,518 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [684690] [2020-07-20 17:53:16,519 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:16,592 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:16,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:16,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 17:53:16,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:16,623 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:53:16,624 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:53:16,625 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [684690] [2020-07-20 17:53:16,625 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:53:16,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 17:53:16,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305444992] [2020-07-20 17:53:16,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 17:53:16,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:16,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 17:53:16,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 17:53:16,645 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2020-07-20 17:53:16,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:16,670 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2020-07-20 17:53:16,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 17:53:16,672 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2020-07-20 17:53:16,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:16,681 INFO L225 Difference]: With dead ends: 47 [2020-07-20 17:53:16,682 INFO L226 Difference]: Without dead ends: 22 [2020-07-20 17:53:16,685 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 17:53:16,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-20 17:53:16,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-20 17:53:16,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 17:53:16,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-07-20 17:53:16,722 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 15 [2020-07-20 17:53:16,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:16,723 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-07-20 17:53:16,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 17:53:16,723 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-07-20 17:53:16,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 17:53:16,724 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:16,724 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:53:16,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:16,926 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:16,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:16,927 INFO L82 PathProgramCache]: Analyzing trace with hash 1632722591, now seen corresponding path program 1 times [2020-07-20 17:53:16,928 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:16,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567783163] [2020-07-20 17:53:16,929 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:16,971 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:16,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:16,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 17:53:16,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:17,027 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:53:17,064 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:53:17,064 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:53:17,065 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567783163] [2020-07-20 17:53:17,065 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:53:17,065 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 17:53:17,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999765071] [2020-07-20 17:53:17,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 17:53:17,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:17,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 17:53:17,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 17:53:17,069 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 5 states. [2020-07-20 17:53:17,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:17,150 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2020-07-20 17:53:17,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 17:53:17,151 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-20 17:53:17,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:17,152 INFO L225 Difference]: With dead ends: 31 [2020-07-20 17:53:17,153 INFO L226 Difference]: Without dead ends: 29 [2020-07-20 17:53:17,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:53:17,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-20 17:53:17,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2020-07-20 17:53:17,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 17:53:17,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-07-20 17:53:17,164 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 17 [2020-07-20 17:53:17,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:17,165 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-07-20 17:53:17,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 17:53:17,165 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-07-20 17:53:17,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 17:53:17,166 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:17,166 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] [2020-07-20 17:53:17,381 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:17,382 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:17,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:17,383 INFO L82 PathProgramCache]: Analyzing trace with hash -1401298672, now seen corresponding path program 1 times [2020-07-20 17:53:17,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:17,384 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1242400838] [2020-07-20 17:53:17,384 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:17,426 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:17,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:17,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 17:53:17,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:17,509 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:53:17,511 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:53:17,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1242400838] [2020-07-20 17:53:17,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:53:17,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 17:53:17,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651643846] [2020-07-20 17:53:17,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 17:53:17,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:17,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 17:53:17,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-20 17:53:17,515 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 5 states. [2020-07-20 17:53:17,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:17,624 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2020-07-20 17:53:17,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 17:53:17,625 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2020-07-20 17:53:17,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:17,629 INFO L225 Difference]: With dead ends: 49 [2020-07-20 17:53:17,629 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 17:53:17,630 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 [2020-07-20 17:53:17,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 17:53:17,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2020-07-20 17:53:17,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 17:53:17,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2020-07-20 17:53:17,643 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 25 [2020-07-20 17:53:17,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:17,643 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2020-07-20 17:53:17,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 17:53:17,644 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2020-07-20 17:53:17,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 17:53:17,645 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:17,645 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] [2020-07-20 17:53:17,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:17,860 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:17,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:17,861 INFO L82 PathProgramCache]: Analyzing trace with hash 1107622837, now seen corresponding path program 1 times [2020-07-20 17:53:17,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:17,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [155104874] [2020-07-20 17:53:17,861 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:17,903 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:17,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:17,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 17:53:17,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:17,960 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:53:17,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:18,020 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:53:18,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [155104874] [2020-07-20 17:53:18,021 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:18,021 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-20 17:53:18,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932714074] [2020-07-20 17:53:18,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 17:53:18,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:18,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 17:53:18,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-20 17:53:18,024 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 8 states. [2020-07-20 17:53:18,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:18,174 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2020-07-20 17:53:18,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 17:53:18,177 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-20 17:53:18,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:18,178 INFO L225 Difference]: With dead ends: 55 [2020-07-20 17:53:18,179 INFO L226 Difference]: Without dead ends: 40 [2020-07-20 17:53:18,181 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 [2020-07-20 17:53:18,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-20 17:53:18,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2020-07-20 17:53:18,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-20 17:53:18,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-20 17:53:18,198 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 27 [2020-07-20 17:53:18,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:18,198 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-20 17:53:18,198 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 17:53:18,199 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-20 17:53:18,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 17:53:18,201 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:18,201 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] [2020-07-20 17:53:18,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:18,402 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:18,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:18,403 INFO L82 PathProgramCache]: Analyzing trace with hash -1590427366, now seen corresponding path program 2 times [2020-07-20 17:53:18,403 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:18,403 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [302715322] [2020-07-20 17:53:18,404 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:18,443 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:18,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:18,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 17:53:18,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:18,476 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:53:18,499 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:53:18,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:18,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:53:18,549 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:53:18,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [302715322] [2020-07-20 17:53:18,550 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:18,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-07-20 17:53:18,551 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282603030] [2020-07-20 17:53:18,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 17:53:18,552 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:18,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 17:53:18,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-20 17:53:18,552 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 8 states. [2020-07-20 17:53:18,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:18,618 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2020-07-20 17:53:18,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 17:53:18,619 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-20 17:53:18,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:18,620 INFO L225 Difference]: With dead ends: 51 [2020-07-20 17:53:18,621 INFO L226 Difference]: Without dead ends: 49 [2020-07-20 17:53:18,621 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 [2020-07-20 17:53:18,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-20 17:53:18,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 44. [2020-07-20 17:53:18,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-20 17:53:18,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-07-20 17:53:18,631 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 29 [2020-07-20 17:53:18,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:18,632 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-07-20 17:53:18,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 17:53:18,632 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-07-20 17:53:18,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-20 17:53:18,635 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:18,635 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] [2020-07-20 17:53:18,850 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:18,851 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:18,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:18,852 INFO L82 PathProgramCache]: Analyzing trace with hash -30298372, now seen corresponding path program 3 times [2020-07-20 17:53:18,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:18,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [307781973] [2020-07-20 17:53:18,853 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:18,891 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:18,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:18,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 17:53:18,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:18,980 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 28 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-20 17:53:18,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:19,075 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-07-20 17:53:19,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [307781973] [2020-07-20 17:53:19,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:19,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-20 17:53:19,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493965361] [2020-07-20 17:53:19,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 17:53:19,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:19,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 17:53:19,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-07-20 17:53:19,086 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 11 states. [2020-07-20 17:53:19,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:19,239 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2020-07-20 17:53:19,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 17:53:19,241 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 45 [2020-07-20 17:53:19,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:19,245 INFO L225 Difference]: With dead ends: 83 [2020-07-20 17:53:19,245 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 17:53:19,246 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 [2020-07-20 17:53:19,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 17:53:19,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 46. [2020-07-20 17:53:19,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 17:53:19,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-07-20 17:53:19,267 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 45 [2020-07-20 17:53:19,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:19,268 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-07-20 17:53:19,268 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 17:53:19,273 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-07-20 17:53:19,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-07-20 17:53:19,274 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:19,274 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] [2020-07-20 17:53:19,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:19,482 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:19,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:19,483 INFO L82 PathProgramCache]: Analyzing trace with hash 130155809, now seen corresponding path program 4 times [2020-07-20 17:53:19,484 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:19,484 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1762472334] [2020-07-20 17:53:19,485 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:19,528 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:19,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:19,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 17:53:19,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:19,629 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 17:53:19,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:19,719 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 17:53:19,720 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1762472334] [2020-07-20 17:53:19,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:19,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-20 17:53:19,721 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336012147] [2020-07-20 17:53:19,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 17:53:19,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:19,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 17:53:19,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2020-07-20 17:53:19,723 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 14 states. [2020-07-20 17:53:19,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:19,905 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2020-07-20 17:53:19,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 17:53:19,905 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 47 [2020-07-20 17:53:19,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:19,907 INFO L225 Difference]: With dead ends: 87 [2020-07-20 17:53:19,907 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 17:53:19,908 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 [2020-07-20 17:53:19,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 17:53:19,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 48. [2020-07-20 17:53:19,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-20 17:53:19,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2020-07-20 17:53:19,915 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 47 [2020-07-20 17:53:19,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:19,916 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2020-07-20 17:53:19,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 17:53:19,916 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2020-07-20 17:53:19,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 17:53:19,917 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:19,917 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] [2020-07-20 17:53:20,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:20,133 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:20,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:20,133 INFO L82 PathProgramCache]: Analyzing trace with hash -292198906, now seen corresponding path program 5 times [2020-07-20 17:53:20,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:20,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1166696281] [2020-07-20 17:53:20,135 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:20,178 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:20,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:20,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 17:53:20,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:20,237 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:53:20,257 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 17:53:20,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:20,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:53:20,341 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 17:53:20,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1166696281] [2020-07-20 17:53:20,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:20,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-07-20 17:53:20,342 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561213289] [2020-07-20 17:53:20,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 17:53:20,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:20,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 17:53:20,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-07-20 17:53:20,346 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 10 states. [2020-07-20 17:53:20,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:20,448 INFO L93 Difference]: Finished difference Result 67 states and 73 transitions. [2020-07-20 17:53:20,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 17:53:20,449 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 49 [2020-07-20 17:53:20,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:20,450 INFO L225 Difference]: With dead ends: 67 [2020-07-20 17:53:20,450 INFO L226 Difference]: Without dead ends: 65 [2020-07-20 17:53:20,451 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 [2020-07-20 17:53:20,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-20 17:53:20,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2020-07-20 17:53:20,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 17:53:20,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2020-07-20 17:53:20,460 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 49 [2020-07-20 17:53:20,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:20,460 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2020-07-20 17:53:20,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 17:53:20,461 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2020-07-20 17:53:20,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 17:53:20,462 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:20,462 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] [2020-07-20 17:53:20,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:20,676 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:20,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:20,676 INFO L82 PathProgramCache]: Analyzing trace with hash 551795688, now seen corresponding path program 6 times [2020-07-20 17:53:20,676 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:20,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1483604054] [2020-07-20 17:53:20,677 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:20,729 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:20,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:20,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 17:53:20,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:20,857 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 72 proven. 20 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-20 17:53:20,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:20,988 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 58 proven. 20 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-07-20 17:53:20,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1483604054] [2020-07-20 17:53:20,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:20,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-20 17:53:20,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35259499] [2020-07-20 17:53:20,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 17:53:20,991 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:20,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 17:53:20,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2020-07-20 17:53:20,992 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand 17 states. [2020-07-20 17:53:21,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:21,228 INFO L93 Difference]: Finished difference Result 115 states and 135 transitions. [2020-07-20 17:53:21,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 17:53:21,229 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 65 [2020-07-20 17:53:21,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:21,235 INFO L225 Difference]: With dead ends: 115 [2020-07-20 17:53:21,236 INFO L226 Difference]: Without dead ends: 82 [2020-07-20 17:53:21,237 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 [2020-07-20 17:53:21,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-20 17:53:21,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 62. [2020-07-20 17:53:21,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-20 17:53:21,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2020-07-20 17:53:21,257 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 65 [2020-07-20 17:53:21,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:21,261 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2020-07-20 17:53:21,261 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 17:53:21,261 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2020-07-20 17:53:21,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 17:53:21,265 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:21,266 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] [2020-07-20 17:53:21,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:21,480 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:21,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:21,480 INFO L82 PathProgramCache]: Analyzing trace with hash -150434419, now seen corresponding path program 7 times [2020-07-20 17:53:21,481 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:21,481 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [170666860] [2020-07-20 17:53:21,481 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:21,529 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:21,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:21,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 17:53:21,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:21,681 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 17:53:21,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:21,822 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 17:53:21,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [170666860] [2020-07-20 17:53:21,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:21,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 20 [2020-07-20 17:53:21,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84496602] [2020-07-20 17:53:21,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 17:53:21,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:21,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 17:53:21,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2020-07-20 17:53:21,825 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand 20 states. [2020-07-20 17:53:22,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:22,099 INFO L93 Difference]: Finished difference Result 119 states and 142 transitions. [2020-07-20 17:53:22,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 17:53:22,099 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2020-07-20 17:53:22,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:22,101 INFO L225 Difference]: With dead ends: 119 [2020-07-20 17:53:22,101 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 17:53:22,102 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 [2020-07-20 17:53:22,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 17:53:22,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 64. [2020-07-20 17:53:22,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-20 17:53:22,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2020-07-20 17:53:22,111 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 67 [2020-07-20 17:53:22,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:22,111 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2020-07-20 17:53:22,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 17:53:22,112 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2020-07-20 17:53:22,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-20 17:53:22,113 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:22,113 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] [2020-07-20 17:53:22,326 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:22,327 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:22,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:22,328 INFO L82 PathProgramCache]: Analyzing trace with hash -683701774, now seen corresponding path program 8 times [2020-07-20 17:53:22,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:22,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1582874482] [2020-07-20 17:53:22,329 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:22,375 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:22,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:22,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 17:53:22,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:22,454 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:53:22,484 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 17:53:22,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:22,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:53:22,606 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 17:53:22,607 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1582874482] [2020-07-20 17:53:22,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:22,608 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-07-20 17:53:22,608 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117428878] [2020-07-20 17:53:22,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 17:53:22,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:22,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 17:53:22,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:53:22,610 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand 12 states. [2020-07-20 17:53:22,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:22,719 INFO L93 Difference]: Finished difference Result 83 states and 90 transitions. [2020-07-20 17:53:22,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 17:53:22,720 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 69 [2020-07-20 17:53:22,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:22,722 INFO L225 Difference]: With dead ends: 83 [2020-07-20 17:53:22,723 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 17:53:22,723 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 [2020-07-20 17:53:22,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 17:53:22,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 76. [2020-07-20 17:53:22,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 17:53:22,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2020-07-20 17:53:22,744 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 69 [2020-07-20 17:53:22,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:22,746 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2020-07-20 17:53:22,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 17:53:22,746 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2020-07-20 17:53:22,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-20 17:53:22,748 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:22,748 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] [2020-07-20 17:53:22,949 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:22,950 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:22,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:22,950 INFO L82 PathProgramCache]: Analyzing trace with hash 192972756, now seen corresponding path program 9 times [2020-07-20 17:53:22,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:22,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1188390343] [2020-07-20 17:53:22,951 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:23,006 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:23,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:23,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 17:53:23,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:23,201 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 132 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-20 17:53:23,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:23,397 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 110 proven. 42 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2020-07-20 17:53:23,397 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1188390343] [2020-07-20 17:53:23,398 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:23,398 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 23 [2020-07-20 17:53:23,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289627184] [2020-07-20 17:53:23,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 17:53:23,399 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:23,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 17:53:23,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 17:53:23,400 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 23 states. [2020-07-20 17:53:23,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:23,734 INFO L93 Difference]: Finished difference Result 147 states and 174 transitions. [2020-07-20 17:53:23,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 17:53:23,735 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 85 [2020-07-20 17:53:23,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:23,737 INFO L225 Difference]: With dead ends: 147 [2020-07-20 17:53:23,737 INFO L226 Difference]: Without dead ends: 106 [2020-07-20 17:53:23,741 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 [2020-07-20 17:53:23,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-20 17:53:23,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 78. [2020-07-20 17:53:23,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-20 17:53:23,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2020-07-20 17:53:23,761 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 85 [2020-07-20 17:53:23,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:23,761 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2020-07-20 17:53:23,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 17:53:23,762 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2020-07-20 17:53:23,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-07-20 17:53:23,764 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:23,764 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] [2020-07-20 17:53:23,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:23,978 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:23,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:23,978 INFO L82 PathProgramCache]: Analyzing trace with hash 1722356985, now seen corresponding path program 10 times [2020-07-20 17:53:23,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:23,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1305943226] [2020-07-20 17:53:23,979 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:24,049 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:24,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:24,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 17:53:24,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:24,269 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 17:53:24,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:24,488 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 17:53:24,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1305943226] [2020-07-20 17:53:24,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:24,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 26 [2020-07-20 17:53:24,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937256194] [2020-07-20 17:53:24,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 17:53:24,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:24,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 17:53:24,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2020-07-20 17:53:24,490 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 26 states. [2020-07-20 17:53:24,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:24,839 INFO L93 Difference]: Finished difference Result 151 states and 181 transitions. [2020-07-20 17:53:24,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 17:53:24,840 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 87 [2020-07-20 17:53:24,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:24,841 INFO L225 Difference]: With dead ends: 151 [2020-07-20 17:53:24,841 INFO L226 Difference]: Without dead ends: 112 [2020-07-20 17:53:24,842 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 [2020-07-20 17:53:24,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-20 17:53:24,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 80. [2020-07-20 17:53:24,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 17:53:24,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2020-07-20 17:53:24,850 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 87 [2020-07-20 17:53:24,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:24,850 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2020-07-20 17:53:24,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 17:53:24,850 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2020-07-20 17:53:24,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-07-20 17:53:24,851 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:24,852 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] [2020-07-20 17:53:25,052 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:25,053 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:25,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:25,053 INFO L82 PathProgramCache]: Analyzing trace with hash -1713181474, now seen corresponding path program 11 times [2020-07-20 17:53:25,054 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:25,054 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1615414529] [2020-07-20 17:53:25,055 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:25,104 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:25,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:25,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 17:53:25,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:25,192 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:53:25,215 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 17:53:25,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:25,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:53:25,353 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 17:53:25,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1615414529] [2020-07-20 17:53:25,354 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:25,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-07-20 17:53:25,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [655130494] [2020-07-20 17:53:25,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 17:53:25,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:25,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 17:53:25,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-07-20 17:53:25,355 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 14 states. [2020-07-20 17:53:25,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:25,501 INFO L93 Difference]: Finished difference Result 99 states and 107 transitions. [2020-07-20 17:53:25,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 17:53:25,502 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 89 [2020-07-20 17:53:25,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:25,503 INFO L225 Difference]: With dead ends: 99 [2020-07-20 17:53:25,503 INFO L226 Difference]: Without dead ends: 97 [2020-07-20 17:53:25,505 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 [2020-07-20 17:53:25,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-20 17:53:25,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 92. [2020-07-20 17:53:25,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-20 17:53:25,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions. [2020-07-20 17:53:25,514 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 89 [2020-07-20 17:53:25,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:25,516 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 99 transitions. [2020-07-20 17:53:25,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 17:53:25,516 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions. [2020-07-20 17:53:25,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-07-20 17:53:25,517 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:25,518 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] [2020-07-20 17:53:25,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:25,727 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:25,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:25,728 INFO L82 PathProgramCache]: Analyzing trace with hash -1950838080, now seen corresponding path program 12 times [2020-07-20 17:53:25,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:25,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [44233718] [2020-07-20 17:53:25,729 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:25,782 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:25,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:25,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 17:53:25,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:26,024 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 208 proven. 72 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-20 17:53:26,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:26,299 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 178 proven. 72 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2020-07-20 17:53:26,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [44233718] [2020-07-20 17:53:26,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:26,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 29 [2020-07-20 17:53:26,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72510839] [2020-07-20 17:53:26,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 17:53:26,300 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:26,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 17:53:26,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2020-07-20 17:53:26,301 INFO L87 Difference]: Start difference. First operand 92 states and 99 transitions. Second operand 29 states. [2020-07-20 17:53:26,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:26,739 INFO L93 Difference]: Finished difference Result 179 states and 213 transitions. [2020-07-20 17:53:26,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 17:53:26,739 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 105 [2020-07-20 17:53:26,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:26,742 INFO L225 Difference]: With dead ends: 179 [2020-07-20 17:53:26,742 INFO L226 Difference]: Without dead ends: 130 [2020-07-20 17:53:26,743 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 [2020-07-20 17:53:26,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-07-20 17:53:26,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 94. [2020-07-20 17:53:26,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-20 17:53:26,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 101 transitions. [2020-07-20 17:53:26,751 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 101 transitions. Word has length 105 [2020-07-20 17:53:26,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:26,751 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 101 transitions. [2020-07-20 17:53:26,751 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 17:53:26,751 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 101 transitions. [2020-07-20 17:53:26,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-20 17:53:26,753 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:26,753 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] [2020-07-20 17:53:26,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:26,961 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:26,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:26,962 INFO L82 PathProgramCache]: Analyzing trace with hash -734782619, now seen corresponding path program 13 times [2020-07-20 17:53:26,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:26,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1293351077] [2020-07-20 17:53:26,963 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:27,019 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:27,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:27,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 17:53:27,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:27,270 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 17:53:27,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:27,589 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 17:53:27,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1293351077] [2020-07-20 17:53:27,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:27,590 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 32 [2020-07-20 17:53:27,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909657050] [2020-07-20 17:53:27,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-20 17:53:27,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:27,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-20 17:53:27,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2020-07-20 17:53:27,593 INFO L87 Difference]: Start difference. First operand 94 states and 101 transitions. Second operand 32 states. [2020-07-20 17:53:28,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:28,060 INFO L93 Difference]: Finished difference Result 183 states and 220 transitions. [2020-07-20 17:53:28,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 17:53:28,060 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 107 [2020-07-20 17:53:28,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:28,062 INFO L225 Difference]: With dead ends: 183 [2020-07-20 17:53:28,062 INFO L226 Difference]: Without dead ends: 136 [2020-07-20 17:53:28,063 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 [2020-07-20 17:53:28,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-20 17:53:28,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 96. [2020-07-20 17:53:28,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-20 17:53:28,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2020-07-20 17:53:28,071 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 107 [2020-07-20 17:53:28,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:28,072 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2020-07-20 17:53:28,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-20 17:53:28,072 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2020-07-20 17:53:28,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 17:53:28,073 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:28,073 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] [2020-07-20 17:53:28,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:28,288 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:28,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:28,288 INFO L82 PathProgramCache]: Analyzing trace with hash -336589110, now seen corresponding path program 14 times [2020-07-20 17:53:28,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:28,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1706108886] [2020-07-20 17:53:28,289 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:28,346 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:28,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:28,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 17:53:28,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:28,449 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:53:28,476 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 17:53:28,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:28,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:53:28,677 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 17:53:28,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1706108886] [2020-07-20 17:53:28,678 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:28,678 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-07-20 17:53:28,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287024520] [2020-07-20 17:53:28,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 17:53:28,679 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:28,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 17:53:28,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-07-20 17:53:28,680 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 16 states. [2020-07-20 17:53:28,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:28,826 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2020-07-20 17:53:28,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 17:53:28,826 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2020-07-20 17:53:28,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:28,828 INFO L225 Difference]: With dead ends: 115 [2020-07-20 17:53:28,829 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 17:53:28,830 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 [2020-07-20 17:53:28,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 17:53:28,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 108. [2020-07-20 17:53:28,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-20 17:53:28,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 116 transitions. [2020-07-20 17:53:28,837 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 116 transitions. Word has length 109 [2020-07-20 17:53:28,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:28,838 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 116 transitions. [2020-07-20 17:53:28,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 17:53:28,838 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 116 transitions. [2020-07-20 17:53:28,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-20 17:53:28,839 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:28,839 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] [2020-07-20 17:53:29,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:29,046 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:29,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:29,047 INFO L82 PathProgramCache]: Analyzing trace with hash 1711037612, now seen corresponding path program 15 times [2020-07-20 17:53:29,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:29,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1708775468] [2020-07-20 17:53:29,049 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:29,111 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:29,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:29,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 17:53:29,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:29,438 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 300 proven. 110 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-20 17:53:29,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:29,790 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 262 proven. 110 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-20 17:53:29,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1708775468] [2020-07-20 17:53:29,791 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:29,791 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 35 [2020-07-20 17:53:29,791 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513881487] [2020-07-20 17:53:29,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 17:53:29,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:29,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 17:53:29,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=892, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 17:53:29,793 INFO L87 Difference]: Start difference. First operand 108 states and 116 transitions. Second operand 35 states. [2020-07-20 17:53:30,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:30,310 INFO L93 Difference]: Finished difference Result 211 states and 252 transitions. [2020-07-20 17:53:30,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 17:53:30,310 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 125 [2020-07-20 17:53:30,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:30,312 INFO L225 Difference]: With dead ends: 211 [2020-07-20 17:53:30,312 INFO L226 Difference]: Without dead ends: 154 [2020-07-20 17:53:30,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 205 SyntacticMatches, 11 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 17:53:30,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-20 17:53:30,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 110. [2020-07-20 17:53:30,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-20 17:53:30,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 118 transitions. [2020-07-20 17:53:30,321 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 118 transitions. Word has length 125 [2020-07-20 17:53:30,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:30,321 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 118 transitions. [2020-07-20 17:53:30,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 17:53:30,321 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 118 transitions. [2020-07-20 17:53:30,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-20 17:53:30,322 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:30,323 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] [2020-07-20 17:53:30,538 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:30,538 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:30,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:30,539 INFO L82 PathProgramCache]: Analyzing trace with hash 66724049, now seen corresponding path program 16 times [2020-07-20 17:53:30,539 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:30,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [621911544] [2020-07-20 17:53:30,540 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:30,609 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:30,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:30,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 17:53:30,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:30,953 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 17:53:30,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:31,362 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 17:53:31,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [621911544] [2020-07-20 17:53:31,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:31,363 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 38 [2020-07-20 17:53:31,363 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382978123] [2020-07-20 17:53:31,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-20 17:53:31,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:31,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-20 17:53:31,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 17:53:31,366 INFO L87 Difference]: Start difference. First operand 110 states and 118 transitions. Second operand 38 states. [2020-07-20 17:53:31,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:31,950 INFO L93 Difference]: Finished difference Result 215 states and 259 transitions. [2020-07-20 17:53:31,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 17:53:31,950 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 127 [2020-07-20 17:53:31,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:31,953 INFO L225 Difference]: With dead ends: 215 [2020-07-20 17:53:31,953 INFO L226 Difference]: Without dead ends: 160 [2020-07-20 17:53:31,956 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 [2020-07-20 17:53:31,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-07-20 17:53:31,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 112. [2020-07-20 17:53:31,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-20 17:53:31,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions. [2020-07-20 17:53:31,964 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 127 [2020-07-20 17:53:31,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:31,965 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 120 transitions. [2020-07-20 17:53:31,965 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-20 17:53:31,965 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions. [2020-07-20 17:53:31,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-07-20 17:53:31,966 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:31,967 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] [2020-07-20 17:53:32,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:32,180 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:32,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:32,181 INFO L82 PathProgramCache]: Analyzing trace with hash 429354934, now seen corresponding path program 17 times [2020-07-20 17:53:32,181 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:32,181 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2069992358] [2020-07-20 17:53:32,182 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:32,249 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:32,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:32,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 17:53:32,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:32,367 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:53:32,401 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 17:53:32,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:32,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:53:32,677 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 17:53:32,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2069992358] [2020-07-20 17:53:32,678 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:32,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-07-20 17:53:32,679 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125173283] [2020-07-20 17:53:32,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 17:53:32,681 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:32,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 17:53:32,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-07-20 17:53:32,682 INFO L87 Difference]: Start difference. First operand 112 states and 120 transitions. Second operand 18 states. [2020-07-20 17:53:32,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:32,855 INFO L93 Difference]: Finished difference Result 131 states and 141 transitions. [2020-07-20 17:53:32,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 17:53:32,859 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 129 [2020-07-20 17:53:32,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:32,861 INFO L225 Difference]: With dead ends: 131 [2020-07-20 17:53:32,861 INFO L226 Difference]: Without dead ends: 129 [2020-07-20 17:53:32,863 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 [2020-07-20 17:53:32,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2020-07-20 17:53:32,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 124. [2020-07-20 17:53:32,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-20 17:53:32,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 133 transitions. [2020-07-20 17:53:32,880 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 133 transitions. Word has length 129 [2020-07-20 17:53:32,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:32,881 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 133 transitions. [2020-07-20 17:53:32,881 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 17:53:32,881 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 133 transitions. [2020-07-20 17:53:32,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-20 17:53:32,883 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:32,884 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] [2020-07-20 17:53:33,097 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:33,098 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:33,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:33,099 INFO L82 PathProgramCache]: Analyzing trace with hash 1971086744, now seen corresponding path program 18 times [2020-07-20 17:53:33,099 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:33,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1738619611] [2020-07-20 17:53:33,099 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:33,187 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:33,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:33,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 17:53:33,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:33,612 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 408 proven. 156 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-20 17:53:33,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:34,130 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 362 proven. 156 refuted. 0 times theorem prover too weak. 314 trivial. 0 not checked. [2020-07-20 17:53:34,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1738619611] [2020-07-20 17:53:34,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:34,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 41 [2020-07-20 17:53:34,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702417895] [2020-07-20 17:53:34,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-20 17:53:34,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:34,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-20 17:53:34,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 17:53:34,134 INFO L87 Difference]: Start difference. First operand 124 states and 133 transitions. Second operand 41 states. [2020-07-20 17:53:34,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:34,782 INFO L93 Difference]: Finished difference Result 243 states and 291 transitions. [2020-07-20 17:53:34,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 17:53:34,782 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 145 [2020-07-20 17:53:34,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:34,784 INFO L225 Difference]: With dead ends: 243 [2020-07-20 17:53:34,784 INFO L226 Difference]: Without dead ends: 178 [2020-07-20 17:53:34,786 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 [2020-07-20 17:53:34,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-20 17:53:34,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 126. [2020-07-20 17:53:34,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-07-20 17:53:34,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 135 transitions. [2020-07-20 17:53:34,798 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 135 transitions. Word has length 145 [2020-07-20 17:53:34,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:34,798 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 135 transitions. [2020-07-20 17:53:34,798 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-20 17:53:34,798 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 135 transitions. [2020-07-20 17:53:34,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2020-07-20 17:53:34,799 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:34,800 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] [2020-07-20 17:53:35,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:35,013 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:35,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:35,014 INFO L82 PathProgramCache]: Analyzing trace with hash 554411325, now seen corresponding path program 19 times [2020-07-20 17:53:35,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:35,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465606346] [2020-07-20 17:53:35,015 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:35,084 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:35,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:35,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 17:53:35,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:35,530 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 17:53:35,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:36,036 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 17:53:36,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465606346] [2020-07-20 17:53:36,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:36,037 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 44 [2020-07-20 17:53:36,037 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990498235] [2020-07-20 17:53:36,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-20 17:53:36,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:36,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-20 17:53:36,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 17:53:36,040 INFO L87 Difference]: Start difference. First operand 126 states and 135 transitions. Second operand 44 states. [2020-07-20 17:53:36,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:36,751 INFO L93 Difference]: Finished difference Result 247 states and 298 transitions. [2020-07-20 17:53:36,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 17:53:36,751 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 147 [2020-07-20 17:53:36,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:36,753 INFO L225 Difference]: With dead ends: 247 [2020-07-20 17:53:36,753 INFO L226 Difference]: Without dead ends: 184 [2020-07-20 17:53:36,755 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 [2020-07-20 17:53:36,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-07-20 17:53:36,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 128. [2020-07-20 17:53:36,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2020-07-20 17:53:36,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions. [2020-07-20 17:53:36,763 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 147 [2020-07-20 17:53:36,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:36,764 INFO L479 AbstractCegarLoop]: Abstraction has 128 states and 137 transitions. [2020-07-20 17:53:36,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-20 17:53:36,764 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions. [2020-07-20 17:53:36,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-20 17:53:36,765 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:36,765 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] [2020-07-20 17:53:36,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:36,981 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:36,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:36,982 INFO L82 PathProgramCache]: Analyzing trace with hash 633966498, now seen corresponding path program 20 times [2020-07-20 17:53:36,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:36,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [449718886] [2020-07-20 17:53:36,982 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:37,054 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:37,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:37,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-20 17:53:37,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:37,221 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:53:37,255 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 17:53:37,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:37,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:53:37,565 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 17:53:37,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [449718886] [2020-07-20 17:53:37,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:37,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-07-20 17:53:37,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188996857] [2020-07-20 17:53:37,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 17:53:37,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:37,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 17:53:37,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=223, Unknown=0, NotChecked=0, Total=380 [2020-07-20 17:53:37,567 INFO L87 Difference]: Start difference. First operand 128 states and 137 transitions. Second operand 20 states. [2020-07-20 17:53:37,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:37,767 INFO L93 Difference]: Finished difference Result 147 states and 158 transitions. [2020-07-20 17:53:37,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 17:53:37,768 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 149 [2020-07-20 17:53:37,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:37,770 INFO L225 Difference]: With dead ends: 147 [2020-07-20 17:53:37,770 INFO L226 Difference]: Without dead ends: 145 [2020-07-20 17:53:37,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 251 SyntacticMatches, 28 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=161, Invalid=259, Unknown=0, NotChecked=0, Total=420 [2020-07-20 17:53:37,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2020-07-20 17:53:37,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 140. [2020-07-20 17:53:37,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-20 17:53:37,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 150 transitions. [2020-07-20 17:53:37,783 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 150 transitions. Word has length 149 [2020-07-20 17:53:37,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:37,784 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 150 transitions. [2020-07-20 17:53:37,784 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 17:53:37,784 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 150 transitions. [2020-07-20 17:53:37,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2020-07-20 17:53:37,786 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:37,786 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] [2020-07-20 17:53:38,000 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:38,001 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:38,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:38,001 INFO L82 PathProgramCache]: Analyzing trace with hash -869716604, now seen corresponding path program 21 times [2020-07-20 17:53:38,001 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:38,002 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [391876196] [2020-07-20 17:53:38,002 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:38,072 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:38,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:38,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 17:53:38,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:38,604 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 532 proven. 210 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-20 17:53:38,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:39,175 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 478 proven. 210 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-20 17:53:39,175 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [391876196] [2020-07-20 17:53:39,175 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:39,176 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 47 [2020-07-20 17:53:39,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381639994] [2020-07-20 17:53:39,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-20 17:53:39,176 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:39,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-20 17:53:39,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 17:53:39,178 INFO L87 Difference]: Start difference. First operand 140 states and 150 transitions. Second operand 47 states. [2020-07-20 17:53:39,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:39,971 INFO L93 Difference]: Finished difference Result 275 states and 330 transitions. [2020-07-20 17:53:39,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-20 17:53:39,971 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 165 [2020-07-20 17:53:39,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:39,974 INFO L225 Difference]: With dead ends: 275 [2020-07-20 17:53:39,974 INFO L226 Difference]: Without dead ends: 202 [2020-07-20 17:53:39,976 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 269 SyntacticMatches, 15 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1021, Invalid=2761, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 17:53:39,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-20 17:53:39,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 142. [2020-07-20 17:53:39,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-20 17:53:39,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 152 transitions. [2020-07-20 17:53:39,984 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 152 transitions. Word has length 165 [2020-07-20 17:53:39,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:39,985 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 152 transitions. [2020-07-20 17:53:39,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-20 17:53:39,985 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 152 transitions. [2020-07-20 17:53:39,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2020-07-20 17:53:39,986 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:39,986 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] [2020-07-20 17:53:40,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:40,201 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:40,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:40,202 INFO L82 PathProgramCache]: Analyzing trace with hash -583456599, now seen corresponding path program 22 times [2020-07-20 17:53:40,202 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:40,202 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1148542585] [2020-07-20 17:53:40,203 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:40,278 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:40,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:40,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 34 conjunts are in the unsatisfiable core [2020-07-20 17:53:40,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:40,884 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 17:53:40,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:41,572 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 17:53:41,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1148542585] [2020-07-20 17:53:41,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:41,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 50 [2020-07-20 17:53:41,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305290625] [2020-07-20 17:53:41,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-20 17:53:41,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:41,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-20 17:53:41,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 17:53:41,574 INFO L87 Difference]: Start difference. First operand 142 states and 152 transitions. Second operand 50 states. [2020-07-20 17:53:42,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:42,564 INFO L93 Difference]: Finished difference Result 279 states and 337 transitions. [2020-07-20 17:53:42,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 17:53:42,564 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 167 [2020-07-20 17:53:42,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:42,567 INFO L225 Difference]: With dead ends: 279 [2020-07-20 17:53:42,567 INFO L226 Difference]: Without dead ends: 208 [2020-07-20 17:53:42,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 269 SyntacticMatches, 16 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1065 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1153, Invalid=3137, Unknown=0, NotChecked=0, Total=4290 [2020-07-20 17:53:42,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-20 17:53:42,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 144. [2020-07-20 17:53:42,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 17:53:42,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 154 transitions. [2020-07-20 17:53:42,590 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 154 transitions. Word has length 167 [2020-07-20 17:53:42,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:42,591 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 154 transitions. [2020-07-20 17:53:42,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-20 17:53:42,591 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 154 transitions. [2020-07-20 17:53:42,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-07-20 17:53:42,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:42,592 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] [2020-07-20 17:53:42,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:42,793 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:42,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:42,794 INFO L82 PathProgramCache]: Analyzing trace with hash -365498738, now seen corresponding path program 23 times [2020-07-20 17:53:42,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:42,794 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1791230077] [2020-07-20 17:53:42,795 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:42,915 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:42,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:42,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 17:53:42,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:43,114 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:53:43,167 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 17:53:43,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:43,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:53:43,555 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 17:53:43,555 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1791230077] [2020-07-20 17:53:43,555 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:43,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-07-20 17:53:43,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237114083] [2020-07-20 17:53:43,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 17:53:43,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:43,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 17:53:43,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=268, Unknown=0, NotChecked=0, Total=462 [2020-07-20 17:53:43,557 INFO L87 Difference]: Start difference. First operand 144 states and 154 transitions. Second operand 22 states. [2020-07-20 17:53:43,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:43,776 INFO L93 Difference]: Finished difference Result 163 states and 175 transitions. [2020-07-20 17:53:43,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 17:53:43,777 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 169 [2020-07-20 17:53:43,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:43,779 INFO L225 Difference]: With dead ends: 163 [2020-07-20 17:53:43,779 INFO L226 Difference]: Without dead ends: 161 [2020-07-20 17:53:43,779 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 [2020-07-20 17:53:43,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2020-07-20 17:53:43,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 156. [2020-07-20 17:53:43,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-20 17:53:43,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 167 transitions. [2020-07-20 17:53:43,789 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 167 transitions. Word has length 169 [2020-07-20 17:53:43,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:43,790 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 167 transitions. [2020-07-20 17:53:43,790 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 17:53:43,790 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 167 transitions. [2020-07-20 17:53:43,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2020-07-20 17:53:43,791 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:43,792 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] [2020-07-20 17:53:44,004 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:44,005 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:44,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:44,006 INFO L82 PathProgramCache]: Analyzing trace with hash -760007568, now seen corresponding path program 24 times [2020-07-20 17:53:44,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:44,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [195974440] [2020-07-20 17:53:44,007 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:44,084 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:44,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:44,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 447 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-20 17:53:44,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:44,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 672 proven. 272 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-07-20 17:53:44,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:45,485 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 610 proven. 272 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2020-07-20 17:53:45,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [195974440] [2020-07-20 17:53:45,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:45,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 53 [2020-07-20 17:53:45,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122785419] [2020-07-20 17:53:45,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-20 17:53:45,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:45,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-20 17:53:45,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2020-07-20 17:53:45,488 INFO L87 Difference]: Start difference. First operand 156 states and 167 transitions. Second operand 53 states. [2020-07-20 17:53:46,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:46,564 INFO L93 Difference]: Finished difference Result 307 states and 369 transitions. [2020-07-20 17:53:46,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 17:53:46,565 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 185 [2020-07-20 17:53:46,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:46,567 INFO L225 Difference]: With dead ends: 307 [2020-07-20 17:53:46,567 INFO L226 Difference]: Without dead ends: 226 [2020-07-20 17:53:46,569 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 [2020-07-20 17:53:46,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-20 17:53:46,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 158. [2020-07-20 17:53:46,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-07-20 17:53:46,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 169 transitions. [2020-07-20 17:53:46,582 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 169 transitions. Word has length 185 [2020-07-20 17:53:46,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:46,582 INFO L479 AbstractCegarLoop]: Abstraction has 158 states and 169 transitions. [2020-07-20 17:53:46,582 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-20 17:53:46,582 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 169 transitions. [2020-07-20 17:53:46,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-20 17:53:46,584 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:46,584 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] [2020-07-20 17:53:46,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:46,798 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:46,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:46,799 INFO L82 PathProgramCache]: Analyzing trace with hash -1861014763, now seen corresponding path program 25 times [2020-07-20 17:53:46,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:46,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1116665261] [2020-07-20 17:53:46,800 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:46,881 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:46,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:46,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 38 conjunts are in the unsatisfiable core [2020-07-20 17:53:46,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:47,602 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 17:53:47,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:48,462 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 17:53:48,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1116665261] [2020-07-20 17:53:48,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:48,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 56 [2020-07-20 17:53:48,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464257197] [2020-07-20 17:53:48,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-20 17:53:48,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:48,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-20 17:53:48,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=2341, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 17:53:48,466 INFO L87 Difference]: Start difference. First operand 158 states and 169 transitions. Second operand 56 states. [2020-07-20 17:53:49,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:49,530 INFO L93 Difference]: Finished difference Result 311 states and 376 transitions. [2020-07-20 17:53:49,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 17:53:49,530 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 187 [2020-07-20 17:53:49,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:49,533 INFO L225 Difference]: With dead ends: 311 [2020-07-20 17:53:49,533 INFO L226 Difference]: Without dead ends: 232 [2020-07-20 17:53:49,535 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 [2020-07-20 17:53:49,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-07-20 17:53:49,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 160. [2020-07-20 17:53:49,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-20 17:53:49,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 171 transitions. [2020-07-20 17:53:49,547 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 171 transitions. Word has length 187 [2020-07-20 17:53:49,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:49,547 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 171 transitions. [2020-07-20 17:53:49,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-20 17:53:49,547 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 171 transitions. [2020-07-20 17:53:49,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-20 17:53:49,549 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:49,549 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] [2020-07-20 17:53:49,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:49,762 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:49,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:49,763 INFO L82 PathProgramCache]: Analyzing trace with hash 927992954, now seen corresponding path program 26 times [2020-07-20 17:53:49,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:49,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [177702232] [2020-07-20 17:53:49,764 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:49,853 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:49,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:49,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-20 17:53:49,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:50,127 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:53:50,211 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 17:53:50,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:50,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:53:50,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 17:53:50,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [177702232] [2020-07-20 17:53:50,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:50,788 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-07-20 17:53:50,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54788686] [2020-07-20 17:53:50,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 17:53:50,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:50,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 17:53:50,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=317, Unknown=0, NotChecked=0, Total=552 [2020-07-20 17:53:50,791 INFO L87 Difference]: Start difference. First operand 160 states and 171 transitions. Second operand 24 states. [2020-07-20 17:53:51,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:51,037 INFO L93 Difference]: Finished difference Result 179 states and 192 transitions. [2020-07-20 17:53:51,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 17:53:51,038 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 189 [2020-07-20 17:53:51,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:51,039 INFO L225 Difference]: With dead ends: 179 [2020-07-20 17:53:51,040 INFO L226 Difference]: Without dead ends: 177 [2020-07-20 17:53:51,042 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 319 SyntacticMatches, 36 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=239, Invalid=361, Unknown=0, NotChecked=0, Total=600 [2020-07-20 17:53:51,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2020-07-20 17:53:51,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 172. [2020-07-20 17:53:51,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2020-07-20 17:53:51,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 184 transitions. [2020-07-20 17:53:51,059 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 184 transitions. Word has length 189 [2020-07-20 17:53:51,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:51,060 INFO L479 AbstractCegarLoop]: Abstraction has 172 states and 184 transitions. [2020-07-20 17:53:51,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 17:53:51,061 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 184 transitions. [2020-07-20 17:53:51,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-20 17:53:51,064 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:51,064 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] [2020-07-20 17:53:51,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:51,278 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:51,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:51,278 INFO L82 PathProgramCache]: Analyzing trace with hash 1753938524, now seen corresponding path program 27 times [2020-07-20 17:53:51,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:51,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1612626457] [2020-07-20 17:53:51,279 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:51,366 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:51,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:51,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 496 conjuncts, 40 conjunts are in the unsatisfiable core [2020-07-20 17:53:51,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:52,179 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 828 proven. 342 refuted. 0 times theorem prover too weak. 616 trivial. 0 not checked. [2020-07-20 17:53:52,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:53,117 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 758 proven. 342 refuted. 0 times theorem prover too weak. 686 trivial. 0 not checked. [2020-07-20 17:53:53,117 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1612626457] [2020-07-20 17:53:53,118 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:53,118 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 59 [2020-07-20 17:53:53,118 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48876673] [2020-07-20 17:53:53,119 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-20 17:53:53,119 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:53,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-20 17:53:53,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2020-07-20 17:53:53,120 INFO L87 Difference]: Start difference. First operand 172 states and 184 transitions. Second operand 59 states. [2020-07-20 17:53:54,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:54,444 INFO L93 Difference]: Finished difference Result 339 states and 408 transitions. [2020-07-20 17:53:54,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 17:53:54,444 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 205 [2020-07-20 17:53:54,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:54,448 INFO L225 Difference]: With dead ends: 339 [2020-07-20 17:53:54,448 INFO L226 Difference]: Without dead ends: 250 [2020-07-20 17:53:54,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 333 SyntacticMatches, 19 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1521 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1597, Invalid=4409, Unknown=0, NotChecked=0, Total=6006 [2020-07-20 17:53:54,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-20 17:53:54,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 174. [2020-07-20 17:53:54,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-20 17:53:54,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 186 transitions. [2020-07-20 17:53:54,465 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 186 transitions. Word has length 205 [2020-07-20 17:53:54,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:54,466 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 186 transitions. [2020-07-20 17:53:54,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-20 17:53:54,466 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 186 transitions. [2020-07-20 17:53:54,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2020-07-20 17:53:54,467 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:54,468 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] [2020-07-20 17:53:54,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:54,684 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:54,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:54,686 INFO L82 PathProgramCache]: Analyzing trace with hash 1542073473, now seen corresponding path program 28 times [2020-07-20 17:53:54,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:54,686 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [279542935] [2020-07-20 17:53:54,686 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:54,780 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:53:54,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:54,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 504 conjuncts, 42 conjunts are in the unsatisfiable core [2020-07-20 17:53:54,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:55,657 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 17:53:55,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:56,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 17:53:56,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [279542935] [2020-07-20 17:53:56,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:56,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 62 [2020-07-20 17:53:56,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467459598] [2020-07-20 17:53:56,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-07-20 17:53:56,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:56,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-07-20 17:53:56,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=2881, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 17:53:56,801 INFO L87 Difference]: Start difference. First operand 174 states and 186 transitions. Second operand 62 states. [2020-07-20 17:53:58,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:58,173 INFO L93 Difference]: Finished difference Result 343 states and 415 transitions. [2020-07-20 17:53:58,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-20 17:53:58,174 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 207 [2020-07-20 17:53:58,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:58,175 INFO L225 Difference]: With dead ends: 343 [2020-07-20 17:53:58,176 INFO L226 Difference]: Without dead ends: 256 [2020-07-20 17:53:58,177 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 333 SyntacticMatches, 20 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1691 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1761, Invalid=4881, Unknown=0, NotChecked=0, Total=6642 [2020-07-20 17:53:58,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-07-20 17:53:58,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 176. [2020-07-20 17:53:58,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-20 17:53:58,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 188 transitions. [2020-07-20 17:53:58,187 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 188 transitions. Word has length 207 [2020-07-20 17:53:58,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:58,188 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 188 transitions. [2020-07-20 17:53:58,188 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-07-20 17:53:58,188 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 188 transitions. [2020-07-20 17:53:58,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2020-07-20 17:53:58,189 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:58,190 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] [2020-07-20 17:53:58,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:58,403 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:58,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:58,404 INFO L82 PathProgramCache]: Analyzing trace with hash -196777626, now seen corresponding path program 29 times [2020-07-20 17:53:58,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:58,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [644908104] [2020-07-20 17:53:58,405 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:58,496 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:58,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:58,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-20 17:53:58,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:58,805 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:53:58,860 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 17:53:58,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:58,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:53:59,451 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 17:53:59,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [644908104] [2020-07-20 17:53:59,451 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:53:59,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-07-20 17:53:59,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882473187] [2020-07-20 17:53:59,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 17:53:59,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:59,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 17:53:59,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=370, Unknown=0, NotChecked=0, Total=650 [2020-07-20 17:53:59,453 INFO L87 Difference]: Start difference. First operand 176 states and 188 transitions. Second operand 26 states. [2020-07-20 17:53:59,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:59,749 INFO L93 Difference]: Finished difference Result 195 states and 209 transitions. [2020-07-20 17:53:59,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 17:53:59,749 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 209 [2020-07-20 17:53:59,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:59,752 INFO L225 Difference]: With dead ends: 195 [2020-07-20 17:53:59,752 INFO L226 Difference]: Without dead ends: 193 [2020-07-20 17:53:59,753 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 [2020-07-20 17:53:59,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2020-07-20 17:53:59,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 188. [2020-07-20 17:53:59,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-20 17:53:59,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 201 transitions. [2020-07-20 17:53:59,764 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 201 transitions. Word has length 209 [2020-07-20 17:53:59,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:59,765 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 201 transitions. [2020-07-20 17:53:59,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 17:53:59,765 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 201 transitions. [2020-07-20 17:53:59,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-07-20 17:53:59,766 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:59,767 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] [2020-07-20 17:53:59,981 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:59,982 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:59,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:59,983 INFO L82 PathProgramCache]: Analyzing trace with hash 65077064, now seen corresponding path program 30 times [2020-07-20 17:53:59,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:59,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1278546250] [2020-07-20 17:53:59,983 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:00,079 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:00,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:00,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 44 conjunts are in the unsatisfiable core [2020-07-20 17:54:00,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:01,075 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 1000 proven. 420 refuted. 0 times theorem prover too weak. 764 trivial. 0 not checked. [2020-07-20 17:54:01,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:02,297 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 922 proven. 420 refuted. 0 times theorem prover too weak. 842 trivial. 0 not checked. [2020-07-20 17:54:02,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1278546250] [2020-07-20 17:54:02,298 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:02,298 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44] total 65 [2020-07-20 17:54:02,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538270892] [2020-07-20 17:54:02,299 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-07-20 17:54:02,299 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:02,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-07-20 17:54:02,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2020-07-20 17:54:02,300 INFO L87 Difference]: Start difference. First operand 188 states and 201 transitions. Second operand 65 states. [2020-07-20 17:54:03,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:03,723 INFO L93 Difference]: Finished difference Result 371 states and 447 transitions. [2020-07-20 17:54:03,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-20 17:54:03,723 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 225 [2020-07-20 17:54:03,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:03,730 INFO L225 Difference]: With dead ends: 371 [2020-07-20 17:54:03,730 INFO L226 Difference]: Without dead ends: 274 [2020-07-20 17:54:03,732 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 [2020-07-20 17:54:03,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-20 17:54:03,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 190. [2020-07-20 17:54:03,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-20 17:54:03,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 203 transitions. [2020-07-20 17:54:03,747 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 203 transitions. Word has length 225 [2020-07-20 17:54:03,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:03,747 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 203 transitions. [2020-07-20 17:54:03,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-07-20 17:54:03,748 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 203 transitions. [2020-07-20 17:54:03,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2020-07-20 17:54:03,749 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:03,749 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] [2020-07-20 17:54:03,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:03,964 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:03,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:03,965 INFO L82 PathProgramCache]: Analyzing trace with hash 1137618157, now seen corresponding path program 31 times [2020-07-20 17:54:03,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:03,965 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [704930696] [2020-07-20 17:54:03,965 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:04,062 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:04,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:04,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 553 conjuncts, 46 conjunts are in the unsatisfiable core [2020-07-20 17:54:04,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:05,158 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 17:54:05,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:06,400 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 17:54:06,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [704930696] [2020-07-20 17:54:06,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:06,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46] total 68 [2020-07-20 17:54:06,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705407261] [2020-07-20 17:54:06,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-20 17:54:06,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:06,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-20 17:54:06,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1079, Invalid=3477, Unknown=0, NotChecked=0, Total=4556 [2020-07-20 17:54:06,403 INFO L87 Difference]: Start difference. First operand 190 states and 203 transitions. Second operand 68 states. [2020-07-20 17:54:07,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:07,957 INFO L93 Difference]: Finished difference Result 375 states and 454 transitions. [2020-07-20 17:54:07,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-20 17:54:07,957 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 227 [2020-07-20 17:54:07,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:07,959 INFO L225 Difference]: With dead ends: 375 [2020-07-20 17:54:07,960 INFO L226 Difference]: Without dead ends: 280 [2020-07-20 17:54:07,961 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 [2020-07-20 17:54:07,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-07-20 17:54:07,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 192. [2020-07-20 17:54:07,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-20 17:54:07,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 205 transitions. [2020-07-20 17:54:07,972 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 205 transitions. Word has length 227 [2020-07-20 17:54:07,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:07,973 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 205 transitions. [2020-07-20 17:54:07,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-20 17:54:07,973 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 205 transitions. [2020-07-20 17:54:07,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2020-07-20 17:54:07,974 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:07,975 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] [2020-07-20 17:54:08,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:08,189 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:08,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:08,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1057457490, now seen corresponding path program 32 times [2020-07-20 17:54:08,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:08,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1876989593] [2020-07-20 17:54:08,190 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:08,300 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:54:08,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:08,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-20 17:54:08,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:08,662 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:54:08,725 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 17:54:08,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:08,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:54:09,474 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 17:54:09,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1876989593] [2020-07-20 17:54:09,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:09,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2020-07-20 17:54:09,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744492910] [2020-07-20 17:54:09,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-20 17:54:09,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:09,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-20 17:54:09,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=427, Unknown=0, NotChecked=0, Total=756 [2020-07-20 17:54:09,479 INFO L87 Difference]: Start difference. First operand 192 states and 205 transitions. Second operand 28 states. [2020-07-20 17:54:09,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:09,755 INFO L93 Difference]: Finished difference Result 211 states and 226 transitions. [2020-07-20 17:54:09,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 17:54:09,756 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 229 [2020-07-20 17:54:09,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:09,758 INFO L225 Difference]: With dead ends: 211 [2020-07-20 17:54:09,758 INFO L226 Difference]: Without dead ends: 209 [2020-07-20 17:54:09,759 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 [2020-07-20 17:54:09,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-20 17:54:09,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 204. [2020-07-20 17:54:09,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-20 17:54:09,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 218 transitions. [2020-07-20 17:54:09,770 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 218 transitions. Word has length 229 [2020-07-20 17:54:09,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:09,771 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 218 transitions. [2020-07-20 17:54:09,771 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-20 17:54:09,771 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 218 transitions. [2020-07-20 17:54:09,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2020-07-20 17:54:09,772 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:09,773 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] [2020-07-20 17:54:09,985 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:09,986 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:09,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:09,986 INFO L82 PathProgramCache]: Analyzing trace with hash -777665740, now seen corresponding path program 33 times [2020-07-20 17:54:09,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:09,987 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [730946022] [2020-07-20 17:54:09,987 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:10,085 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:10,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:10,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 594 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-20 17:54:10,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:11,277 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1188 proven. 506 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2020-07-20 17:54:11,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:12,651 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1102 proven. 506 refuted. 0 times theorem prover too weak. 1014 trivial. 0 not checked. [2020-07-20 17:54:12,651 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [730946022] [2020-07-20 17:54:12,651 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:12,651 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48] total 71 [2020-07-20 17:54:12,652 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390343365] [2020-07-20 17:54:12,652 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-07-20 17:54:12,652 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:12,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-07-20 17:54:12,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2020-07-20 17:54:12,654 INFO L87 Difference]: Start difference. First operand 204 states and 218 transitions. Second operand 71 states. [2020-07-20 17:54:14,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:14,308 INFO L93 Difference]: Finished difference Result 403 states and 486 transitions. [2020-07-20 17:54:14,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 17:54:14,308 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 245 [2020-07-20 17:54:14,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:14,311 INFO L225 Difference]: With dead ends: 403 [2020-07-20 17:54:14,311 INFO L226 Difference]: Without dead ends: 298 [2020-07-20 17:54:14,313 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 [2020-07-20 17:54:14,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2020-07-20 17:54:14,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 206. [2020-07-20 17:54:14,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-20 17:54:14,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 220 transitions. [2020-07-20 17:54:14,327 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 220 transitions. Word has length 245 [2020-07-20 17:54:14,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:14,327 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 220 transitions. [2020-07-20 17:54:14,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-07-20 17:54:14,328 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 220 transitions. [2020-07-20 17:54:14,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2020-07-20 17:54:14,330 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:14,330 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] [2020-07-20 17:54:14,544 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:14,545 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:14,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:14,545 INFO L82 PathProgramCache]: Analyzing trace with hash 1435577433, now seen corresponding path program 34 times [2020-07-20 17:54:14,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:14,546 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [785821721] [2020-07-20 17:54:14,546 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:14,644 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:14,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:14,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 602 conjuncts, 50 conjunts are in the unsatisfiable core [2020-07-20 17:54:14,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:15,936 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 17:54:15,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:17,439 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 17:54:17,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [785821721] [2020-07-20 17:54:17,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:17,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50] total 74 [2020-07-20 17:54:17,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100437484] [2020-07-20 17:54:17,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2020-07-20 17:54:17,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:17,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2020-07-20 17:54:17,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2020-07-20 17:54:17,442 INFO L87 Difference]: Start difference. First operand 206 states and 220 transitions. Second operand 74 states. [2020-07-20 17:54:19,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:19,339 INFO L93 Difference]: Finished difference Result 407 states and 493 transitions. [2020-07-20 17:54:19,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-20 17:54:19,339 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 247 [2020-07-20 17:54:19,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:19,342 INFO L225 Difference]: With dead ends: 407 [2020-07-20 17:54:19,342 INFO L226 Difference]: Without dead ends: 304 [2020-07-20 17:54:19,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 397 SyntacticMatches, 24 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2461 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2497, Invalid=7009, Unknown=0, NotChecked=0, Total=9506 [2020-07-20 17:54:19,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2020-07-20 17:54:19,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 208. [2020-07-20 17:54:19,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-20 17:54:19,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 222 transitions. [2020-07-20 17:54:19,354 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 222 transitions. Word has length 247 [2020-07-20 17:54:19,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:19,355 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 222 transitions. [2020-07-20 17:54:19,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 74 states. [2020-07-20 17:54:19,355 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 222 transitions. [2020-07-20 17:54:19,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-20 17:54:19,356 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:19,357 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] [2020-07-20 17:54:19,559 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:19,560 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:19,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:19,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1941512130, now seen corresponding path program 35 times [2020-07-20 17:54:19,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:19,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1182079756] [2020-07-20 17:54:19,561 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:19,673 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:54:19,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:19,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-20 17:54:19,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:20,091 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:54:20,171 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 17:54:20,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:20,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:54:21,028 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 17:54:21,028 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1182079756] [2020-07-20 17:54:21,028 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:21,028 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2020-07-20 17:54:21,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011201601] [2020-07-20 17:54:21,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 17:54:21,029 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:21,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 17:54:21,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=488, Unknown=0, NotChecked=0, Total=870 [2020-07-20 17:54:21,030 INFO L87 Difference]: Start difference. First operand 208 states and 222 transitions. Second operand 30 states. [2020-07-20 17:54:21,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:21,363 INFO L93 Difference]: Finished difference Result 227 states and 243 transitions. [2020-07-20 17:54:21,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-20 17:54:21,363 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 249 [2020-07-20 17:54:21,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:21,366 INFO L225 Difference]: With dead ends: 227 [2020-07-20 17:54:21,366 INFO L226 Difference]: Without dead ends: 225 [2020-07-20 17:54:21,366 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 [2020-07-20 17:54:21,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-20 17:54:21,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 220. [2020-07-20 17:54:21,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2020-07-20 17:54:21,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 235 transitions. [2020-07-20 17:54:21,377 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 235 transitions. Word has length 249 [2020-07-20 17:54:21,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:21,377 INFO L479 AbstractCegarLoop]: Abstraction has 220 states and 235 transitions. [2020-07-20 17:54:21,377 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-20 17:54:21,377 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 235 transitions. [2020-07-20 17:54:21,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2020-07-20 17:54:21,379 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:21,379 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] [2020-07-20 17:54:21,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:21,595 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:21,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:21,596 INFO L82 PathProgramCache]: Analyzing trace with hash -712391136, now seen corresponding path program 36 times [2020-07-20 17:54:21,596 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:21,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409530405] [2020-07-20 17:54:21,596 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:21,705 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:21,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:21,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 52 conjunts are in the unsatisfiable core [2020-07-20 17:54:21,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:23,119 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1392 proven. 600 refuted. 0 times theorem prover too weak. 1108 trivial. 0 not checked. [2020-07-20 17:54:23,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:24,773 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1298 proven. 600 refuted. 0 times theorem prover too weak. 1202 trivial. 0 not checked. [2020-07-20 17:54:24,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409530405] [2020-07-20 17:54:24,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:24,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52] total 77 [2020-07-20 17:54:24,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726015528] [2020-07-20 17:54:24,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-07-20 17:54:24,774 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:24,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-07-20 17:54:24,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2020-07-20 17:54:24,775 INFO L87 Difference]: Start difference. First operand 220 states and 235 transitions. Second operand 77 states. [2020-07-20 17:54:26,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:26,752 INFO L93 Difference]: Finished difference Result 435 states and 525 transitions. [2020-07-20 17:54:26,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-20 17:54:26,753 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 265 [2020-07-20 17:54:26,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:26,754 INFO L225 Difference]: With dead ends: 435 [2020-07-20 17:54:26,754 INFO L226 Difference]: Without dead ends: 322 [2020-07-20 17:54:26,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 554 GetRequests, 429 SyntacticMatches, 25 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2676 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2701, Invalid=7601, Unknown=0, NotChecked=0, Total=10302 [2020-07-20 17:54:26,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-20 17:54:26,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 222. [2020-07-20 17:54:26,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-20 17:54:26,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 237 transitions. [2020-07-20 17:54:26,768 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 237 transitions. Word has length 265 [2020-07-20 17:54:26,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:26,768 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 237 transitions. [2020-07-20 17:54:26,768 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-07-20 17:54:26,768 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 237 transitions. [2020-07-20 17:54:26,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2020-07-20 17:54:26,770 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:26,770 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] [2020-07-20 17:54:26,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:26,985 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:26,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:26,986 INFO L82 PathProgramCache]: Analyzing trace with hash -993908027, now seen corresponding path program 37 times [2020-07-20 17:54:26,986 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:26,986 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1499908507] [2020-07-20 17:54:26,986 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:27,104 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:27,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:27,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 651 conjuncts, 54 conjunts are in the unsatisfiable core [2020-07-20 17:54:27,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:28,630 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 17:54:28,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:30,449 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 17:54:30,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1499908507] [2020-07-20 17:54:30,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:30,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54] total 80 [2020-07-20 17:54:30,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563131753] [2020-07-20 17:54:30,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2020-07-20 17:54:30,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:30,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2020-07-20 17:54:30,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2020-07-20 17:54:30,451 INFO L87 Difference]: Start difference. First operand 222 states and 237 transitions. Second operand 80 states. [2020-07-20 17:54:32,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:32,608 INFO L93 Difference]: Finished difference Result 439 states and 532 transitions. [2020-07-20 17:54:32,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-20 17:54:32,608 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 267 [2020-07-20 17:54:32,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:32,610 INFO L225 Difference]: With dead ends: 439 [2020-07-20 17:54:32,610 INFO L226 Difference]: Without dead ends: 328 [2020-07-20 17:54:32,611 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 429 SyntacticMatches, 26 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2900 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=2913, Invalid=8217, Unknown=0, NotChecked=0, Total=11130 [2020-07-20 17:54:32,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2020-07-20 17:54:32,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 224. [2020-07-20 17:54:32,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-20 17:54:32,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 239 transitions. [2020-07-20 17:54:32,624 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 239 transitions. Word has length 267 [2020-07-20 17:54:32,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:32,624 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 239 transitions. [2020-07-20 17:54:32,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 80 states. [2020-07-20 17:54:32,624 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 239 transitions. [2020-07-20 17:54:32,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-07-20 17:54:32,626 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:32,626 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] [2020-07-20 17:54:32,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:32,840 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:32,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:32,841 INFO L82 PathProgramCache]: Analyzing trace with hash -948700630, now seen corresponding path program 38 times [2020-07-20 17:54:32,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:32,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1238849965] [2020-07-20 17:54:32,841 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:32,954 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:54:32,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:32,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 55 conjunts are in the unsatisfiable core [2020-07-20 17:54:32,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:33,462 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:54:33,541 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 17:54:33,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:33,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:54:34,584 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 17:54:34,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1238849965] [2020-07-20 17:54:34,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:34,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2020-07-20 17:54:34,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123665750] [2020-07-20 17:54:34,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-20 17:54:34,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:34,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-20 17:54:34,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=553, Unknown=0, NotChecked=0, Total=992 [2020-07-20 17:54:34,587 INFO L87 Difference]: Start difference. First operand 224 states and 239 transitions. Second operand 32 states. [2020-07-20 17:54:34,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:34,967 INFO L93 Difference]: Finished difference Result 243 states and 260 transitions. [2020-07-20 17:54:34,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-20 17:54:34,973 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 269 [2020-07-20 17:54:34,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:34,975 INFO L225 Difference]: With dead ends: 243 [2020-07-20 17:54:34,975 INFO L226 Difference]: Without dead ends: 241 [2020-07-20 17:54:34,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 455 SyntacticMatches, 52 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=443, Invalid=613, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 17:54:34,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2020-07-20 17:54:34,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 236. [2020-07-20 17:54:34,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-20 17:54:34,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 252 transitions. [2020-07-20 17:54:34,989 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 252 transitions. Word has length 269 [2020-07-20 17:54:34,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:34,991 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 252 transitions. [2020-07-20 17:54:34,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-20 17:54:34,991 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 252 transitions. [2020-07-20 17:54:34,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2020-07-20 17:54:34,993 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:34,993 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] [2020-07-20 17:54:35,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:35,209 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:35,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:35,210 INFO L82 PathProgramCache]: Analyzing trace with hash 167610380, now seen corresponding path program 39 times [2020-07-20 17:54:35,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:35,210 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [508181171] [2020-07-20 17:54:35,210 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:35,322 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:35,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:35,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 692 conjuncts, 56 conjunts are in the unsatisfiable core [2020-07-20 17:54:35,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:37,059 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1612 proven. 702 refuted. 0 times theorem prover too weak. 1304 trivial. 0 not checked. [2020-07-20 17:54:37,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:39,122 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1510 proven. 702 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2020-07-20 17:54:39,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [508181171] [2020-07-20 17:54:39,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:39,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56] total 83 [2020-07-20 17:54:39,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695224980] [2020-07-20 17:54:39,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-07-20 17:54:39,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:39,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-07-20 17:54:39,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1594, Invalid=5212, Unknown=0, NotChecked=0, Total=6806 [2020-07-20 17:54:39,126 INFO L87 Difference]: Start difference. First operand 236 states and 252 transitions. Second operand 83 states. [2020-07-20 17:54:41,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:41,441 INFO L93 Difference]: Finished difference Result 467 states and 564 transitions. [2020-07-20 17:54:41,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-20 17:54:41,441 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 285 [2020-07-20 17:54:41,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:41,443 INFO L225 Difference]: With dead ends: 467 [2020-07-20 17:54:41,443 INFO L226 Difference]: Without dead ends: 346 [2020-07-20 17:54:41,445 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 [2020-07-20 17:54:41,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2020-07-20 17:54:41,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 238. [2020-07-20 17:54:41,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-20 17:54:41,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 254 transitions. [2020-07-20 17:54:41,458 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 254 transitions. Word has length 285 [2020-07-20 17:54:41,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:41,459 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 254 transitions. [2020-07-20 17:54:41,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-07-20 17:54:41,459 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 254 transitions. [2020-07-20 17:54:41,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-07-20 17:54:41,461 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:41,461 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] [2020-07-20 17:54:41,674 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:41,675 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:41,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:41,675 INFO L82 PathProgramCache]: Analyzing trace with hash 196225073, now seen corresponding path program 40 times [2020-07-20 17:54:41,675 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:41,676 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762833284] [2020-07-20 17:54:41,676 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:41,791 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:41,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:41,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 700 conjuncts, 58 conjunts are in the unsatisfiable core [2020-07-20 17:54:41,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:43,608 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 17:54:43,609 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:45,748 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 17:54:45,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762833284] [2020-07-20 17:54:45,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:45,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58] total 86 [2020-07-20 17:54:45,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098889366] [2020-07-20 17:54:45,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2020-07-20 17:54:45,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:45,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2020-07-20 17:54:45,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2020-07-20 17:54:45,751 INFO L87 Difference]: Start difference. First operand 238 states and 254 transitions. Second operand 86 states. [2020-07-20 17:54:48,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:48,234 INFO L93 Difference]: Finished difference Result 471 states and 571 transitions. [2020-07-20 17:54:48,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-20 17:54:48,234 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 287 [2020-07-20 17:54:48,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:48,236 INFO L225 Difference]: With dead ends: 471 [2020-07-20 17:54:48,236 INFO L226 Difference]: Without dead ends: 352 [2020-07-20 17:54:48,238 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 461 SyntacticMatches, 28 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3375 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=3361, Invalid=9521, Unknown=0, NotChecked=0, Total=12882 [2020-07-20 17:54:48,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2020-07-20 17:54:48,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 240. [2020-07-20 17:54:48,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-20 17:54:48,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 256 transitions. [2020-07-20 17:54:48,252 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 256 transitions. Word has length 287 [2020-07-20 17:54:48,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:48,252 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 256 transitions. [2020-07-20 17:54:48,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 86 states. [2020-07-20 17:54:48,252 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 256 transitions. [2020-07-20 17:54:48,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2020-07-20 17:54:48,254 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:48,255 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] [2020-07-20 17:54:48,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:48,469 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:48,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:48,469 INFO L82 PathProgramCache]: Analyzing trace with hash 1925141270, now seen corresponding path program 41 times [2020-07-20 17:54:48,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:48,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1152570464] [2020-07-20 17:54:48,470 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:48,592 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:54:48,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:48,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 782 conjuncts, 59 conjunts are in the unsatisfiable core [2020-07-20 17:54:48,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:49,245 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:54:49,337 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 17:54:49,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:49,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:54:50,689 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 17:54:50,689 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1152570464] [2020-07-20 17:54:50,689 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:50,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2020-07-20 17:54:50,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962953856] [2020-07-20 17:54:50,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-20 17:54:50,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:50,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-20 17:54:50,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=500, Invalid=622, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 17:54:50,691 INFO L87 Difference]: Start difference. First operand 240 states and 256 transitions. Second operand 34 states. [2020-07-20 17:54:51,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:51,147 INFO L93 Difference]: Finished difference Result 259 states and 277 transitions. [2020-07-20 17:54:51,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 17:54:51,148 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 289 [2020-07-20 17:54:51,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:51,149 INFO L225 Difference]: With dead ends: 259 [2020-07-20 17:54:51,149 INFO L226 Difference]: Without dead ends: 257 [2020-07-20 17:54:51,150 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 489 SyntacticMatches, 56 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=504, Invalid=686, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 17:54:51,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-20 17:54:51,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 252. [2020-07-20 17:54:51,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 252 states. [2020-07-20 17:54:51,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 269 transitions. [2020-07-20 17:54:51,162 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 269 transitions. Word has length 289 [2020-07-20 17:54:51,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:51,162 INFO L479 AbstractCegarLoop]: Abstraction has 252 states and 269 transitions. [2020-07-20 17:54:51,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-20 17:54:51,163 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 269 transitions. [2020-07-20 17:54:51,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2020-07-20 17:54:51,165 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:51,165 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] [2020-07-20 17:54:51,378 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:51,379 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:51,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:51,379 INFO L82 PathProgramCache]: Analyzing trace with hash -2144237320, now seen corresponding path program 42 times [2020-07-20 17:54:51,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:51,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1358458461] [2020-07-20 17:54:51,380 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:51,510 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:51,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:51,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 741 conjuncts, 60 conjunts are in the unsatisfiable core [2020-07-20 17:54:51,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:53,517 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1848 proven. 812 refuted. 0 times theorem prover too weak. 1516 trivial. 0 not checked. [2020-07-20 17:54:53,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:55,830 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1738 proven. 812 refuted. 0 times theorem prover too weak. 1626 trivial. 0 not checked. [2020-07-20 17:54:55,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1358458461] [2020-07-20 17:54:55,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:55,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60] total 89 [2020-07-20 17:54:55,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421065724] [2020-07-20 17:54:55,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-07-20 17:54:55,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:55,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-07-20 17:54:55,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2020-07-20 17:54:55,833 INFO L87 Difference]: Start difference. First operand 252 states and 269 transitions. Second operand 89 states. [2020-07-20 17:54:58,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:58,608 INFO L93 Difference]: Finished difference Result 499 states and 603 transitions. [2020-07-20 17:54:58,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-07-20 17:54:58,608 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 305 [2020-07-20 17:54:58,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:58,614 INFO L225 Difference]: With dead ends: 499 [2020-07-20 17:54:58,614 INFO L226 Difference]: Without dead ends: 370 [2020-07-20 17:54:58,616 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 [2020-07-20 17:54:58,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2020-07-20 17:54:58,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 254. [2020-07-20 17:54:58,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-20 17:54:58,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 271 transitions. [2020-07-20 17:54:58,630 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 271 transitions. Word has length 305 [2020-07-20 17:54:58,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:58,630 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 271 transitions. [2020-07-20 17:54:58,631 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-07-20 17:54:58,631 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 271 transitions. [2020-07-20 17:54:58,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 308 [2020-07-20 17:54:58,633 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:58,633 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] [2020-07-20 17:54:58,847 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:58,848 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:58,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:58,849 INFO L82 PathProgramCache]: Analyzing trace with hash 191997085, now seen corresponding path program 43 times [2020-07-20 17:54:58,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:58,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1404496003] [2020-07-20 17:54:58,849 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:58,972 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:58,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:58,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 749 conjuncts, 62 conjunts are in the unsatisfiable core [2020-07-20 17:54:58,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:01,127 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 17:55:01,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:03,718 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 17:55:03,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1404496003] [2020-07-20 17:55:03,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:03,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62] total 92 [2020-07-20 17:55:03,719 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200473504] [2020-07-20 17:55:03,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2020-07-20 17:55:03,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:03,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2020-07-20 17:55:03,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2020-07-20 17:55:03,720 INFO L87 Difference]: Start difference. First operand 254 states and 271 transitions. Second operand 92 states. [2020-07-20 17:55:06,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:06,676 INFO L93 Difference]: Finished difference Result 503 states and 610 transitions. [2020-07-20 17:55:06,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-07-20 17:55:06,676 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 307 [2020-07-20 17:55:06,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:06,678 INFO L225 Difference]: With dead ends: 503 [2020-07-20 17:55:06,678 INFO L226 Difference]: Without dead ends: 376 [2020-07-20 17:55:06,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 643 GetRequests, 493 SyntacticMatches, 30 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3886 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=3841, Invalid=10921, Unknown=0, NotChecked=0, Total=14762 [2020-07-20 17:55:06,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2020-07-20 17:55:06,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 256. [2020-07-20 17:55:06,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-20 17:55:06,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 273 transitions. [2020-07-20 17:55:06,694 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 273 transitions. Word has length 307 [2020-07-20 17:55:06,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:06,695 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 273 transitions. [2020-07-20 17:55:06,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 92 states. [2020-07-20 17:55:06,695 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 273 transitions. [2020-07-20 17:55:06,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2020-07-20 17:55:06,697 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:06,697 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] [2020-07-20 17:55:06,911 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:06,912 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:06,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:06,912 INFO L82 PathProgramCache]: Analyzing trace with hash -954635518, now seen corresponding path program 44 times [2020-07-20 17:55:06,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:06,913 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [457281292] [2020-07-20 17:55:06,913 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:07,046 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:55:07,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:07,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 836 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-20 17:55:07,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:07,767 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:55:07,862 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 17:55:07,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:07,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:55:09,371 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 17:55:09,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [457281292] [2020-07-20 17:55:09,371 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:09,371 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2020-07-20 17:55:09,371 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517536472] [2020-07-20 17:55:09,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 17:55:09,372 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:09,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 17:55:09,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=695, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 17:55:09,372 INFO L87 Difference]: Start difference. First operand 256 states and 273 transitions. Second operand 36 states. [2020-07-20 17:55:09,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:09,871 INFO L93 Difference]: Finished difference Result 275 states and 294 transitions. [2020-07-20 17:55:09,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-20 17:55:09,872 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 309 [2020-07-20 17:55:09,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:09,874 INFO L225 Difference]: With dead ends: 275 [2020-07-20 17:55:09,874 INFO L226 Difference]: Without dead ends: 273 [2020-07-20 17:55:09,875 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 618 GetRequests, 523 SyntacticMatches, 60 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1109 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=569, Invalid=763, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 17:55:09,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2020-07-20 17:55:09,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 268. [2020-07-20 17:55:09,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-20 17:55:09,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 286 transitions. [2020-07-20 17:55:09,890 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 286 transitions. Word has length 309 [2020-07-20 17:55:09,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:09,890 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 286 transitions. [2020-07-20 17:55:09,890 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 17:55:09,890 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 286 transitions. [2020-07-20 17:55:09,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2020-07-20 17:55:09,893 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:09,893 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] [2020-07-20 17:55:10,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:10,100 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:10,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:10,101 INFO L82 PathProgramCache]: Analyzing trace with hash -2146023196, now seen corresponding path program 45 times [2020-07-20 17:55:10,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:10,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [674154684] [2020-07-20 17:55:10,102 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:10,229 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:10,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:10,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 790 conjuncts, 64 conjunts are in the unsatisfiable core [2020-07-20 17:55:10,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:12,560 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 2100 proven. 930 refuted. 0 times theorem prover too weak. 1744 trivial. 0 not checked. [2020-07-20 17:55:12,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:15,307 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 1982 proven. 930 refuted. 0 times theorem prover too weak. 1862 trivial. 0 not checked. [2020-07-20 17:55:15,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [674154684] [2020-07-20 17:55:15,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:15,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64] total 95 [2020-07-20 17:55:15,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781374100] [2020-07-20 17:55:15,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-07-20 17:55:15,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:15,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-07-20 17:55:15,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2020-07-20 17:55:15,311 INFO L87 Difference]: Start difference. First operand 268 states and 286 transitions. Second operand 95 states. [2020-07-20 17:55:19,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:19,764 INFO L93 Difference]: Finished difference Result 531 states and 642 transitions. [2020-07-20 17:55:19,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-20 17:55:19,765 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 325 [2020-07-20 17:55:19,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:19,768 INFO L225 Difference]: With dead ends: 531 [2020-07-20 17:55:19,769 INFO L226 Difference]: Without dead ends: 394 [2020-07-20 17:55:19,773 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 525 SyntacticMatches, 31 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4155 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=4093, Invalid=11657, Unknown=0, NotChecked=0, Total=15750 [2020-07-20 17:55:19,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2020-07-20 17:55:19,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 270. [2020-07-20 17:55:19,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-20 17:55:19,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 288 transitions. [2020-07-20 17:55:19,796 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 288 transitions. Word has length 325 [2020-07-20 17:55:19,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:19,797 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 288 transitions. [2020-07-20 17:55:19,797 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-07-20 17:55:19,797 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 288 transitions. [2020-07-20 17:55:19,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-20 17:55:19,801 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:19,801 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] [2020-07-20 17:55:20,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:20,016 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:20,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:20,017 INFO L82 PathProgramCache]: Analyzing trace with hash 735125513, now seen corresponding path program 46 times [2020-07-20 17:55:20,017 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:20,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [881143593] [2020-07-20 17:55:20,017 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:20,222 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:20,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:20,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 798 conjuncts, 66 conjunts are in the unsatisfiable core [2020-07-20 17:55:20,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:23,475 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 17:55:23,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:26,471 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 17:55:26,471 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [881143593] [2020-07-20 17:55:26,471 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:26,471 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66] total 98 [2020-07-20 17:55:26,472 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754069558] [2020-07-20 17:55:26,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-07-20 17:55:26,472 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:26,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-07-20 17:55:26,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2209, Invalid=7297, Unknown=0, NotChecked=0, Total=9506 [2020-07-20 17:55:26,473 INFO L87 Difference]: Start difference. First operand 270 states and 288 transitions. Second operand 98 states. [2020-07-20 17:55:29,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:29,747 INFO L93 Difference]: Finished difference Result 535 states and 649 transitions. [2020-07-20 17:55:29,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-07-20 17:55:29,748 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 327 [2020-07-20 17:55:29,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:29,750 INFO L225 Difference]: With dead ends: 535 [2020-07-20 17:55:29,750 INFO L226 Difference]: Without dead ends: 400 [2020-07-20 17:55:29,752 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 [2020-07-20 17:55:29,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2020-07-20 17:55:29,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 272. [2020-07-20 17:55:29,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2020-07-20 17:55:29,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 290 transitions. [2020-07-20 17:55:29,766 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 290 transitions. Word has length 327 [2020-07-20 17:55:29,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:29,766 INFO L479 AbstractCegarLoop]: Abstraction has 272 states and 290 transitions. [2020-07-20 17:55:29,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-07-20 17:55:29,766 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 290 transitions. [2020-07-20 17:55:29,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2020-07-20 17:55:29,769 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:29,769 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] [2020-07-20 17:55:29,983 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:29,983 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:29,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:29,984 INFO L82 PathProgramCache]: Analyzing trace with hash -734871058, now seen corresponding path program 47 times [2020-07-20 17:55:29,984 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:29,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2122785569] [2020-07-20 17:55:29,985 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:30,135 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:55:30,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:30,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 890 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 17:55:30,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:30,971 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:55:31,078 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 17:55:31,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:31,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:55:32,831 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 17:55:32,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2122785569] [2020-07-20 17:55:32,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:32,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2020-07-20 17:55:32,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141099013] [2020-07-20 17:55:32,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-20 17:55:32,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:32,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-20 17:55:32,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=634, Invalid=772, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 17:55:32,833 INFO L87 Difference]: Start difference. First operand 272 states and 290 transitions. Second operand 38 states. [2020-07-20 17:55:33,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:33,347 INFO L93 Difference]: Finished difference Result 291 states and 311 transitions. [2020-07-20 17:55:33,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-20 17:55:33,349 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 329 [2020-07-20 17:55:33,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:33,351 INFO L225 Difference]: With dead ends: 291 [2020-07-20 17:55:33,351 INFO L226 Difference]: Without dead ends: 289 [2020-07-20 17:55:33,352 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 [2020-07-20 17:55:33,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2020-07-20 17:55:33,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 284. [2020-07-20 17:55:33,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-20 17:55:33,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 303 transitions. [2020-07-20 17:55:33,365 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 303 transitions. Word has length 329 [2020-07-20 17:55:33,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:33,366 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 303 transitions. [2020-07-20 17:55:33,366 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-20 17:55:33,366 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 303 transitions. [2020-07-20 17:55:33,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2020-07-20 17:55:33,368 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:33,369 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] [2020-07-20 17:55:33,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:33,583 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:33,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:33,584 INFO L82 PathProgramCache]: Analyzing trace with hash -1470347312, now seen corresponding path program 48 times [2020-07-20 17:55:33,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:33,584 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1487674073] [2020-07-20 17:55:33,585 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:33,721 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:33,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:33,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 839 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-20 17:55:33,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:36,535 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2368 proven. 1056 refuted. 0 times theorem prover too weak. 1988 trivial. 0 not checked. [2020-07-20 17:55:36,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:39,843 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2242 proven. 1056 refuted. 0 times theorem prover too weak. 2114 trivial. 0 not checked. [2020-07-20 17:55:39,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1487674073] [2020-07-20 17:55:39,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:39,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68] total 101 [2020-07-20 17:55:39,844 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888498148] [2020-07-20 17:55:39,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-20 17:55:39,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:39,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-20 17:55:39,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2020-07-20 17:55:39,846 INFO L87 Difference]: Start difference. First operand 284 states and 303 transitions. Second operand 101 states. [2020-07-20 17:55:43,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:43,970 INFO L93 Difference]: Finished difference Result 563 states and 681 transitions. [2020-07-20 17:55:43,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2020-07-20 17:55:43,970 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 345 [2020-07-20 17:55:43,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:43,972 INFO L225 Difference]: With dead ends: 563 [2020-07-20 17:55:43,972 INFO L226 Difference]: Without dead ends: 418 [2020-07-20 17:55:43,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 557 SyntacticMatches, 33 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4720 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=4621, Invalid=13201, Unknown=0, NotChecked=0, Total=17822 [2020-07-20 17:55:43,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2020-07-20 17:55:43,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 286. [2020-07-20 17:55:43,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2020-07-20 17:55:43,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 305 transitions. [2020-07-20 17:55:43,990 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 305 transitions. Word has length 345 [2020-07-20 17:55:43,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:43,990 INFO L479 AbstractCegarLoop]: Abstraction has 286 states and 305 transitions. [2020-07-20 17:55:43,990 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-20 17:55:43,990 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 305 transitions. [2020-07-20 17:55:43,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2020-07-20 17:55:43,993 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:43,993 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] [2020-07-20 17:55:44,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:44,209 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:44,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:44,209 INFO L82 PathProgramCache]: Analyzing trace with hash 2069961333, now seen corresponding path program 49 times [2020-07-20 17:55:44,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:44,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [490164468] [2020-07-20 17:55:44,210 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:44,349 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:44,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:44,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 847 conjuncts, 70 conjunts are in the unsatisfiable core [2020-07-20 17:55:44,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:47,388 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 17:55:47,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:50,951 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 17:55:50,951 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [490164468] [2020-07-20 17:55:50,952 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:50,952 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70] total 104 [2020-07-20 17:55:50,952 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504038269] [2020-07-20 17:55:50,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2020-07-20 17:55:50,953 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:50,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2020-07-20 17:55:50,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2483, Invalid=8229, Unknown=0, NotChecked=0, Total=10712 [2020-07-20 17:55:50,954 INFO L87 Difference]: Start difference. First operand 286 states and 305 transitions. Second operand 104 states. [2020-07-20 17:55:55,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:55,027 INFO L93 Difference]: Finished difference Result 567 states and 688 transitions. [2020-07-20 17:55:55,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-20 17:55:55,027 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 347 [2020-07-20 17:55:55,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:55,029 INFO L225 Difference]: With dead ends: 567 [2020-07-20 17:55:55,029 INFO L226 Difference]: Without dead ends: 424 [2020-07-20 17:55:55,031 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 727 GetRequests, 557 SyntacticMatches, 34 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5016 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=4897, Invalid=14009, Unknown=0, NotChecked=0, Total=18906 [2020-07-20 17:55:55,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2020-07-20 17:55:55,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 288. [2020-07-20 17:55:55,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-20 17:55:55,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 307 transitions. [2020-07-20 17:55:55,042 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 307 transitions. Word has length 347 [2020-07-20 17:55:55,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:55,043 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 307 transitions. [2020-07-20 17:55:55,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 104 states. [2020-07-20 17:55:55,043 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 307 transitions. [2020-07-20 17:55:55,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2020-07-20 17:55:55,045 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:55,045 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] [2020-07-20 17:55:55,258 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:55,259 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:55,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:55,259 INFO L82 PathProgramCache]: Analyzing trace with hash -1602496550, now seen corresponding path program 50 times [2020-07-20 17:55:55,259 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:55,259 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [491718149] [2020-07-20 17:55:55,260 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:55,424 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:55:55,424 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:55,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 944 conjuncts, 71 conjunts are in the unsatisfiable core [2020-07-20 17:55:55,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:56,420 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:55:56,539 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 17:55:56,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:56,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:55:58,625 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 17:55:58,625 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [491718149] [2020-07-20 17:55:58,625 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:58,626 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2020-07-20 17:55:58,626 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732669503] [2020-07-20 17:55:58,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-20 17:55:58,626 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:58,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-20 17:55:58,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=707, Invalid=853, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 17:55:58,627 INFO L87 Difference]: Start difference. First operand 288 states and 307 transitions. Second operand 40 states. [2020-07-20 17:55:59,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:59,281 INFO L93 Difference]: Finished difference Result 307 states and 328 transitions. [2020-07-20 17:55:59,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 17:55:59,282 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 349 [2020-07-20 17:55:59,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:59,284 INFO L225 Difference]: With dead ends: 307 [2020-07-20 17:55:59,284 INFO L226 Difference]: Without dead ends: 305 [2020-07-20 17:55:59,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 591 SyntacticMatches, 68 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1393 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=711, Invalid=929, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 17:55:59,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2020-07-20 17:55:59,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 300. [2020-07-20 17:55:59,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-07-20 17:55:59,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 320 transitions. [2020-07-20 17:55:59,302 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 320 transitions. Word has length 349 [2020-07-20 17:55:59,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:59,302 INFO L479 AbstractCegarLoop]: Abstraction has 300 states and 320 transitions. [2020-07-20 17:55:59,302 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-20 17:55:59,302 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 320 transitions. [2020-07-20 17:55:59,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2020-07-20 17:55:59,305 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:59,305 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] [2020-07-20 17:55:59,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:59,521 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:59,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:59,521 INFO L82 PathProgramCache]: Analyzing trace with hash 242484668, now seen corresponding path program 51 times [2020-07-20 17:55:59,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:59,522 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [904579791] [2020-07-20 17:55:59,522 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:59,666 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:59,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:59,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 888 conjuncts, 72 conjunts are in the unsatisfiable core [2020-07-20 17:55:59,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:02,969 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2652 proven. 1190 refuted. 0 times theorem prover too weak. 2248 trivial. 0 not checked. [2020-07-20 17:56:02,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:06,946 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2518 proven. 1190 refuted. 0 times theorem prover too weak. 2382 trivial. 0 not checked. [2020-07-20 17:56:06,947 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [904579791] [2020-07-20 17:56:06,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:06,947 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72] total 107 [2020-07-20 17:56:06,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100608117] [2020-07-20 17:56:06,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2020-07-20 17:56:06,948 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:06,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2020-07-20 17:56:06,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2020-07-20 17:56:06,949 INFO L87 Difference]: Start difference. First operand 300 states and 320 transitions. Second operand 107 states. [2020-07-20 17:56:11,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:11,578 INFO L93 Difference]: Finished difference Result 595 states and 720 transitions. [2020-07-20 17:56:11,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-07-20 17:56:11,578 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 365 [2020-07-20 17:56:11,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:11,580 INFO L225 Difference]: With dead ends: 595 [2020-07-20 17:56:11,580 INFO L226 Difference]: Without dead ends: 442 [2020-07-20 17:56:11,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 589 SyntacticMatches, 35 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5321 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=5181, Invalid=14841, Unknown=0, NotChecked=0, Total=20022 [2020-07-20 17:56:11,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2020-07-20 17:56:11,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 302. [2020-07-20 17:56:11,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-07-20 17:56:11,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 322 transitions. [2020-07-20 17:56:11,598 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 322 transitions. Word has length 365 [2020-07-20 17:56:11,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:11,598 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 322 transitions. [2020-07-20 17:56:11,598 INFO L480 AbstractCegarLoop]: Interpolant automaton has 107 states. [2020-07-20 17:56:11,598 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 322 transitions. [2020-07-20 17:56:11,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 368 [2020-07-20 17:56:11,600 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:11,601 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] [2020-07-20 17:56:11,801 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:11,801 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:11,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:11,802 INFO L82 PathProgramCache]: Analyzing trace with hash -814607391, now seen corresponding path program 52 times [2020-07-20 17:56:11,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:11,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1217509113] [2020-07-20 17:56:11,803 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:11,945 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:56:11,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:11,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 896 conjuncts, 74 conjunts are in the unsatisfiable core [2020-07-20 17:56:11,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:15,576 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 17:56:15,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:19,884 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 17:56:19,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1217509113] [2020-07-20 17:56:19,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:19,885 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74] total 110 [2020-07-20 17:56:19,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816036990] [2020-07-20 17:56:19,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2020-07-20 17:56:19,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:19,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2020-07-20 17:56:19,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2773, Invalid=9217, Unknown=0, NotChecked=0, Total=11990 [2020-07-20 17:56:19,887 INFO L87 Difference]: Start difference. First operand 302 states and 322 transitions. Second operand 110 states. [2020-07-20 17:56:25,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:25,219 INFO L93 Difference]: Finished difference Result 599 states and 727 transitions. [2020-07-20 17:56:25,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2020-07-20 17:56:25,220 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 367 [2020-07-20 17:56:25,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:25,222 INFO L225 Difference]: With dead ends: 599 [2020-07-20 17:56:25,222 INFO L226 Difference]: Without dead ends: 448 [2020-07-20 17:56:25,225 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 769 GetRequests, 589 SyntacticMatches, 36 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5635 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=5473, Invalid=15697, Unknown=0, NotChecked=0, Total=21170 [2020-07-20 17:56:25,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2020-07-20 17:56:25,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 304. [2020-07-20 17:56:25,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-20 17:56:25,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 324 transitions. [2020-07-20 17:56:25,242 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 324 transitions. Word has length 367 [2020-07-20 17:56:25,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:25,242 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 324 transitions. [2020-07-20 17:56:25,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 110 states. [2020-07-20 17:56:25,243 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 324 transitions. [2020-07-20 17:56:25,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2020-07-20 17:56:25,245 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:25,245 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] [2020-07-20 17:56:25,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:25,459 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:25,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:25,459 INFO L82 PathProgramCache]: Analyzing trace with hash 1227173062, now seen corresponding path program 53 times [2020-07-20 17:56:25,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:25,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2141574810] [2020-07-20 17:56:25,460 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:25,620 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:56:25,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:25,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 75 conjunts are in the unsatisfiable core [2020-07-20 17:56:25,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:26,846 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:56:26,983 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 17:56:26,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:27,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:56:29,482 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 17:56:29,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2141574810] [2020-07-20 17:56:29,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:29,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 42 [2020-07-20 17:56:29,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30330840] [2020-07-20 17:56:29,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-20 17:56:29,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:29,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-20 17:56:29,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=784, Invalid=938, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 17:56:29,485 INFO L87 Difference]: Start difference. First operand 304 states and 324 transitions. Second operand 42 states. [2020-07-20 17:56:30,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:30,176 INFO L93 Difference]: Finished difference Result 323 states and 345 transitions. [2020-07-20 17:56:30,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-20 17:56:30,177 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 369 [2020-07-20 17:56:30,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:30,179 INFO L225 Difference]: With dead ends: 323 [2020-07-20 17:56:30,179 INFO L226 Difference]: Without dead ends: 321 [2020-07-20 17:56:30,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 738 GetRequests, 625 SyntacticMatches, 72 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1547 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=788, Invalid=1018, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 17:56:30,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-20 17:56:30,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 316. [2020-07-20 17:56:30,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-20 17:56:30,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 337 transitions. [2020-07-20 17:56:30,192 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 337 transitions. Word has length 369 [2020-07-20 17:56:30,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:30,193 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 337 transitions. [2020-07-20 17:56:30,193 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-20 17:56:30,193 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 337 transitions. [2020-07-20 17:56:30,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 386 [2020-07-20 17:56:30,195 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:30,195 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] [2020-07-20 17:56:30,395 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:30,396 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:30,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:30,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1586365096, now seen corresponding path program 54 times [2020-07-20 17:56:30,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:30,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1443790126] [2020-07-20 17:56:30,397 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:30,546 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:56:30,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:30,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 937 conjuncts, 76 conjunts are in the unsatisfiable core [2020-07-20 17:56:30,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:34,528 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2952 proven. 1332 refuted. 0 times theorem prover too weak. 2524 trivial. 0 not checked. [2020-07-20 17:56:34,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:39,234 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2810 proven. 1332 refuted. 0 times theorem prover too weak. 2666 trivial. 0 not checked. [2020-07-20 17:56:39,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1443790126] [2020-07-20 17:56:39,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:39,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76] total 113 [2020-07-20 17:56:39,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914004815] [2020-07-20 17:56:39,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2020-07-20 17:56:39,235 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:39,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2020-07-20 17:56:39,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2020-07-20 17:56:39,237 INFO L87 Difference]: Start difference. First operand 316 states and 337 transitions. Second operand 113 states. [2020-07-20 17:56:44,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:44,478 INFO L93 Difference]: Finished difference Result 627 states and 759 transitions. [2020-07-20 17:56:44,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-20 17:56:44,478 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 385 [2020-07-20 17:56:44,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:44,481 INFO L225 Difference]: With dead ends: 627 [2020-07-20 17:56:44,481 INFO L226 Difference]: Without dead ends: 466 [2020-07-20 17:56:44,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 806 GetRequests, 621 SyntacticMatches, 37 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5958 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=5773, Invalid=16577, Unknown=0, NotChecked=0, Total=22350 [2020-07-20 17:56:44,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2020-07-20 17:56:44,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 318. [2020-07-20 17:56:44,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2020-07-20 17:56:44,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 339 transitions. [2020-07-20 17:56:44,496 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 339 transitions. Word has length 385 [2020-07-20 17:56:44,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:44,496 INFO L479 AbstractCegarLoop]: Abstraction has 318 states and 339 transitions. [2020-07-20 17:56:44,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 113 states. [2020-07-20 17:56:44,496 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 339 transitions. [2020-07-20 17:56:44,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2020-07-20 17:56:44,498 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:44,499 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] [2020-07-20 17:56:44,707 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:44,708 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:44,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:44,709 INFO L82 PathProgramCache]: Analyzing trace with hash -468415411, now seen corresponding path program 55 times [2020-07-20 17:56:44,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:44,709 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [934942963] [2020-07-20 17:56:44,710 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:44,877 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:56:44,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:44,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 945 conjuncts, 78 conjunts are in the unsatisfiable core [2020-07-20 17:56:44,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:49,185 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 17:56:49,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:54,305 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 17:56:54,305 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [934942963] [2020-07-20 17:56:54,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:54,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78] total 116 [2020-07-20 17:56:54,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558328433] [2020-07-20 17:56:54,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2020-07-20 17:56:54,307 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:54,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2020-07-20 17:56:54,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3079, Invalid=10261, Unknown=0, NotChecked=0, Total=13340 [2020-07-20 17:56:54,308 INFO L87 Difference]: Start difference. First operand 318 states and 339 transitions. Second operand 116 states. [2020-07-20 17:56:59,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:59,989 INFO L93 Difference]: Finished difference Result 631 states and 766 transitions. [2020-07-20 17:56:59,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2020-07-20 17:56:59,989 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 387 [2020-07-20 17:56:59,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:59,991 INFO L225 Difference]: With dead ends: 631 [2020-07-20 17:56:59,991 INFO L226 Difference]: Without dead ends: 472 [2020-07-20 17:56:59,994 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 811 GetRequests, 621 SyntacticMatches, 38 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6290 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=6081, Invalid=17481, Unknown=0, NotChecked=0, Total=23562 [2020-07-20 17:56:59,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-07-20 17:57:00,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 320. [2020-07-20 17:57:00,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 320 states. [2020-07-20 17:57:00,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 341 transitions. [2020-07-20 17:57:00,011 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 341 transitions. Word has length 387 [2020-07-20 17:57:00,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:57:00,012 INFO L479 AbstractCegarLoop]: Abstraction has 320 states and 341 transitions. [2020-07-20 17:57:00,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 116 states. [2020-07-20 17:57:00,012 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 341 transitions. [2020-07-20 17:57:00,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2020-07-20 17:57:00,014 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:57:00,015 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] [2020-07-20 17:57:00,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:00,225 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:57:00,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:57:00,226 INFO L82 PathProgramCache]: Analyzing trace with hash 572473522, now seen corresponding path program 56 times [2020-07-20 17:57:00,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:57:00,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284544091] [2020-07-20 17:57:00,226 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:00,409 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:57:00,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:57:00,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 1052 conjuncts, 79 conjunts are in the unsatisfiable core [2020-07-20 17:57:00,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:57:01,844 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:57:02,012 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 17:57:02,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:57:02,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:57:05,026 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 17:57:05,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284544091] [2020-07-20 17:57:05,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:57:05,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43] total 44 [2020-07-20 17:57:05,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092427715] [2020-07-20 17:57:05,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-20 17:57:05,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:57:05,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-20 17:57:05,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=865, Invalid=1027, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 17:57:05,028 INFO L87 Difference]: Start difference. First operand 320 states and 341 transitions. Second operand 44 states. [2020-07-20 17:57:05,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:57:05,856 INFO L93 Difference]: Finished difference Result 339 states and 362 transitions. [2020-07-20 17:57:05,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-20 17:57:05,857 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 389 [2020-07-20 17:57:05,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:57:05,860 INFO L225 Difference]: With dead ends: 339 [2020-07-20 17:57:05,860 INFO L226 Difference]: Without dead ends: 337 [2020-07-20 17:57:05,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 778 GetRequests, 659 SyntacticMatches, 76 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1709 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=869, Invalid=1111, Unknown=0, NotChecked=0, Total=1980 [2020-07-20 17:57:05,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2020-07-20 17:57:05,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 332. [2020-07-20 17:57:05,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-07-20 17:57:05,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 354 transitions. [2020-07-20 17:57:05,878 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 354 transitions. Word has length 389 [2020-07-20 17:57:05,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:57:05,878 INFO L479 AbstractCegarLoop]: Abstraction has 332 states and 354 transitions. [2020-07-20 17:57:05,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-20 17:57:05,879 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 354 transitions. [2020-07-20 17:57:05,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2020-07-20 17:57:05,881 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:57:05,882 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] [2020-07-20 17:57:06,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:06,096 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:57:06,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:57:06,096 INFO L82 PathProgramCache]: Analyzing trace with hash -73744748, now seen corresponding path program 57 times [2020-07-20 17:57:06,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:57:06,097 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2077489935] [2020-07-20 17:57:06,097 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:06,260 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:57:06,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:57:06,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 986 conjuncts, 80 conjunts are in the unsatisfiable core [2020-07-20 17:57:06,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:57:11,067 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3268 proven. 1482 refuted. 0 times theorem prover too weak. 2816 trivial. 0 not checked. [2020-07-20 17:57:11,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:57:16,793 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3118 proven. 1482 refuted. 0 times theorem prover too weak. 2966 trivial. 0 not checked. [2020-07-20 17:57:16,793 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2077489935] [2020-07-20 17:57:16,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:57:16,794 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80] total 119 [2020-07-20 17:57:16,794 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658004237] [2020-07-20 17:57:16,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2020-07-20 17:57:16,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:57:16,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2020-07-20 17:57:16,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2020-07-20 17:57:16,796 INFO L87 Difference]: Start difference. First operand 332 states and 354 transitions. Second operand 119 states. [2020-07-20 17:57:23,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:57:23,356 INFO L93 Difference]: Finished difference Result 659 states and 798 transitions. [2020-07-20 17:57:23,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2020-07-20 17:57:23,356 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 405 [2020-07-20 17:57:23,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:57:23,358 INFO L225 Difference]: With dead ends: 659 [2020-07-20 17:57:23,358 INFO L226 Difference]: Without dead ends: 490 [2020-07-20 17:57:23,361 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 653 SyntacticMatches, 39 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6631 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=6397, Invalid=18409, Unknown=0, NotChecked=0, Total=24806 [2020-07-20 17:57:23,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-20 17:57:23,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 334. [2020-07-20 17:57:23,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 334 states. [2020-07-20 17:57:23,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 356 transitions. [2020-07-20 17:57:23,375 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 356 transitions. Word has length 405 [2020-07-20 17:57:23,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:57:23,375 INFO L479 AbstractCegarLoop]: Abstraction has 334 states and 356 transitions. [2020-07-20 17:57:23,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 119 states. [2020-07-20 17:57:23,375 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 356 transitions. [2020-07-20 17:57:23,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-07-20 17:57:23,378 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:57:23,378 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] [2020-07-20 17:57:23,579 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:23,580 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:57:23,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:57:23,581 INFO L82 PathProgramCache]: Analyzing trace with hash 2082014137, now seen corresponding path program 58 times [2020-07-20 17:57:23,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:57:23,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [824433681] [2020-07-20 17:57:23,582 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:23,739 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:57:23,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:57:23,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 994 conjuncts, 82 conjunts are in the unsatisfiable core [2020-07-20 17:57:23,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:57:28,903 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 17:57:28,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:57:35,008 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 17:57:35,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [824433681] [2020-07-20 17:57:35,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:57:35,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82] total 122 [2020-07-20 17:57:35,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676068911] [2020-07-20 17:57:35,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2020-07-20 17:57:35,009 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:57:35,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2020-07-20 17:57:35,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3401, Invalid=11361, Unknown=0, NotChecked=0, Total=14762 [2020-07-20 17:57:35,010 INFO L87 Difference]: Start difference. First operand 334 states and 356 transitions. Second operand 122 states. [2020-07-20 17:57:41,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:57:41,814 INFO L93 Difference]: Finished difference Result 663 states and 805 transitions. [2020-07-20 17:57:41,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-20 17:57:41,814 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 407 [2020-07-20 17:57:41,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:57:41,816 INFO L225 Difference]: With dead ends: 663 [2020-07-20 17:57:41,816 INFO L226 Difference]: Without dead ends: 496 [2020-07-20 17:57:41,819 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 853 GetRequests, 653 SyntacticMatches, 40 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6981 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=6721, Invalid=19361, Unknown=0, NotChecked=0, Total=26082 [2020-07-20 17:57:41,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2020-07-20 17:57:41,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 336. [2020-07-20 17:57:41,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 336 states. [2020-07-20 17:57:41,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 358 transitions. [2020-07-20 17:57:41,832 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 358 transitions. Word has length 407 [2020-07-20 17:57:41,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:57:41,833 INFO L479 AbstractCegarLoop]: Abstraction has 336 states and 358 transitions. [2020-07-20 17:57:41,833 INFO L480 AbstractCegarLoop]: Interpolant automaton has 122 states. [2020-07-20 17:57:41,833 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 358 transitions. [2020-07-20 17:57:41,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2020-07-20 17:57:41,835 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:57:41,835 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] [2020-07-20 17:57:42,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:42,036 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:57:42,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:57:42,036 INFO L82 PathProgramCache]: Analyzing trace with hash -702901346, now seen corresponding path program 59 times [2020-07-20 17:57:42,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:57:42,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [218235129] [2020-07-20 17:57:42,037 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:42,214 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:57:42,214 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:57:42,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 1106 conjuncts, 83 conjunts are in the unsatisfiable core [2020-07-20 17:57:42,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:57:43,956 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:57:44,139 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 17:57:44,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:57:44,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:57:47,782 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 17:57:47,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [218235129] [2020-07-20 17:57:47,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:57:47,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45] total 46 [2020-07-20 17:57:47,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987658319] [2020-07-20 17:57:47,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-20 17:57:47,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:57:47,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-20 17:57:47,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=950, Invalid=1120, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 17:57:47,784 INFO L87 Difference]: Start difference. First operand 336 states and 358 transitions. Second operand 46 states. [2020-07-20 17:57:48,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:57:48,684 INFO L93 Difference]: Finished difference Result 355 states and 379 transitions. [2020-07-20 17:57:48,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-20 17:57:48,686 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 409 [2020-07-20 17:57:48,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:57:48,688 INFO L225 Difference]: With dead ends: 355 [2020-07-20 17:57:48,688 INFO L226 Difference]: Without dead ends: 353 [2020-07-20 17:57:48,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 693 SyntacticMatches, 80 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1879 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=954, Invalid=1208, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 17:57:48,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-20 17:57:48,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 348. [2020-07-20 17:57:48,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-20 17:57:48,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 371 transitions. [2020-07-20 17:57:48,708 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 371 transitions. Word has length 409 [2020-07-20 17:57:48,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:57:48,708 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 371 transitions. [2020-07-20 17:57:48,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-07-20 17:57:48,708 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 371 transitions. [2020-07-20 17:57:48,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2020-07-20 17:57:48,711 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:57:48,712 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] [2020-07-20 17:57:48,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:48,925 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:57:48,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:57:48,926 INFO L82 PathProgramCache]: Analyzing trace with hash 524990848, now seen corresponding path program 60 times [2020-07-20 17:57:48,926 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:57:48,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [154779892] [2020-07-20 17:57:48,926 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:49,093 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:57:49,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:57:49,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 1035 conjuncts, 84 conjunts are in the unsatisfiable core [2020-07-20 17:57:49,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:57:54,920 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3600 proven. 1640 refuted. 0 times theorem prover too weak. 3124 trivial. 0 not checked. [2020-07-20 17:57:54,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:58:01,963 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3442 proven. 1640 refuted. 0 times theorem prover too weak. 3282 trivial. 0 not checked. [2020-07-20 17:58:01,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [154779892] [2020-07-20 17:58:01,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:58:01,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84] total 125 [2020-07-20 17:58:01,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600906556] [2020-07-20 17:58:01,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 125 states [2020-07-20 17:58:01,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:01,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2020-07-20 17:58:01,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3568, Invalid=11932, Unknown=0, NotChecked=0, Total=15500 [2020-07-20 17:58:01,966 INFO L87 Difference]: Start difference. First operand 348 states and 371 transitions. Second operand 125 states. [2020-07-20 17:58:09,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:58:09,890 INFO L93 Difference]: Finished difference Result 691 states and 837 transitions. [2020-07-20 17:58:09,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-20 17:58:09,890 INFO L78 Accepts]: Start accepts. Automaton has 125 states. Word has length 425 [2020-07-20 17:58:09,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:58:09,893 INFO L225 Difference]: With dead ends: 691 [2020-07-20 17:58:09,893 INFO L226 Difference]: Without dead ends: 514 [2020-07-20 17:58:09,895 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 890 GetRequests, 685 SyntacticMatches, 41 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7340 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=7053, Invalid=20337, Unknown=0, NotChecked=0, Total=27390 [2020-07-20 17:58:09,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-20 17:58:10,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 350. [2020-07-20 17:58:10,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2020-07-20 17:58:10,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 373 transitions. [2020-07-20 17:58:10,119 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 373 transitions. Word has length 425 [2020-07-20 17:58:10,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:58:10,120 INFO L479 AbstractCegarLoop]: Abstraction has 350 states and 373 transitions. [2020-07-20 17:58:10,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 125 states. [2020-07-20 17:58:10,120 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 373 transitions. [2020-07-20 17:58:10,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 428 [2020-07-20 17:58:10,122 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:10,122 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] [2020-07-20 17:58:10,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:10,323 INFO L427 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:10,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:10,324 INFO L82 PathProgramCache]: Analyzing trace with hash -2129659355, now seen corresponding path program 61 times [2020-07-20 17:58:10,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:10,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [995667744] [2020-07-20 17:58:10,325 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:10,491 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:58:10,491 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:10,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 1043 conjuncts, 86 conjunts are in the unsatisfiable core [2020-07-20 17:58:10,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:58:16,961 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 17:58:16,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:58:24,814 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 17:58:24,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [995667744] [2020-07-20 17:58:24,814 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:58:24,815 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86] total 128 [2020-07-20 17:58:24,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39680194] [2020-07-20 17:58:24,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2020-07-20 17:58:24,816 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:24,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2020-07-20 17:58:24,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3739, Invalid=12517, Unknown=0, NotChecked=0, Total=16256 [2020-07-20 17:58:24,817 INFO L87 Difference]: Start difference. First operand 350 states and 373 transitions. Second operand 128 states. [2020-07-20 17:58:33,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:58:33,237 INFO L93 Difference]: Finished difference Result 695 states and 844 transitions. [2020-07-20 17:58:33,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-20 17:58:33,237 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 427 [2020-07-20 17:58:33,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:58:33,240 INFO L225 Difference]: With dead ends: 695 [2020-07-20 17:58:33,240 INFO L226 Difference]: Without dead ends: 520 [2020-07-20 17:58:33,242 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 895 GetRequests, 685 SyntacticMatches, 42 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7708 ImplicationChecksByTransitivity, 17.3s TimeCoverageRelationStatistics Valid=7393, Invalid=21337, Unknown=0, NotChecked=0, Total=28730 [2020-07-20 17:58:33,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2020-07-20 17:58:33,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 352. [2020-07-20 17:58:33,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-20 17:58:33,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 375 transitions. [2020-07-20 17:58:33,257 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 375 transitions. Word has length 427 [2020-07-20 17:58:33,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:58:33,257 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 375 transitions. [2020-07-20 17:58:33,257 INFO L480 AbstractCegarLoop]: Interpolant automaton has 128 states. [2020-07-20 17:58:33,257 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 375 transitions. [2020-07-20 17:58:33,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 430 [2020-07-20 17:58:33,260 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:33,261 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] [2020-07-20 17:58:33,474 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:33,475 INFO L427 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:33,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:33,476 INFO L82 PathProgramCache]: Analyzing trace with hash -2037930614, now seen corresponding path program 62 times [2020-07-20 17:58:33,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:33,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2015039581] [2020-07-20 17:58:33,477 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:33,662 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:58:33,663 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:33,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 1160 conjuncts, 87 conjunts are in the unsatisfiable core [2020-07-20 17:58:33,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:58:35,902 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:58:36,103 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 17:58:36,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:58:36,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:58:40,695 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 17:58:40,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2015039581] [2020-07-20 17:58:40,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:58:40,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47] total 48 [2020-07-20 17:58:40,696 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975263774] [2020-07-20 17:58:40,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 17:58:40,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:40,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 17:58:40,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1039, Invalid=1217, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 17:58:40,697 INFO L87 Difference]: Start difference. First operand 352 states and 375 transitions. Second operand 48 states. [2020-07-20 17:58:41,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:58:41,761 INFO L93 Difference]: Finished difference Result 371 states and 396 transitions. [2020-07-20 17:58:41,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 17:58:41,763 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 429 [2020-07-20 17:58:41,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:58:41,766 INFO L225 Difference]: With dead ends: 371 [2020-07-20 17:58:41,766 INFO L226 Difference]: Without dead ends: 369 [2020-07-20 17:58:41,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 858 GetRequests, 727 SyntacticMatches, 84 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2057 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=1043, Invalid=1309, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 17:58:41,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-20 17:58:41,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 364. [2020-07-20 17:58:41,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2020-07-20 17:58:41,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 388 transitions. [2020-07-20 17:58:41,780 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 388 transitions. Word has length 429 [2020-07-20 17:58:41,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:58:41,781 INFO L479 AbstractCegarLoop]: Abstraction has 364 states and 388 transitions. [2020-07-20 17:58:41,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 17:58:41,781 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 388 transitions. [2020-07-20 17:58:41,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 446 [2020-07-20 17:58:41,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:41,783 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] [2020-07-20 17:58:41,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:41,984 INFO L427 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:41,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:41,985 INFO L82 PathProgramCache]: Analyzing trace with hash -99716244, now seen corresponding path program 63 times [2020-07-20 17:58:41,986 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:41,986 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1971193478] [2020-07-20 17:58:41,986 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:42,164 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:58:42,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:42,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 1084 conjuncts, 88 conjunts are in the unsatisfiable core [2020-07-20 17:58:42,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:58:49,406 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3948 proven. 1806 refuted. 0 times theorem prover too weak. 3448 trivial. 0 not checked. [2020-07-20 17:58:49,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:58:58,137 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3782 proven. 1806 refuted. 0 times theorem prover too weak. 3614 trivial. 0 not checked. [2020-07-20 17:58:58,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1971193478] [2020-07-20 17:58:58,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:58:58,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88] total 131 [2020-07-20 17:58:58,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374507407] [2020-07-20 17:58:58,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2020-07-20 17:58:58,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:58,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2020-07-20 17:58:58,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3914, Invalid=13116, Unknown=0, NotChecked=0, Total=17030 [2020-07-20 17:58:58,142 INFO L87 Difference]: Start difference. First operand 364 states and 388 transitions. Second operand 131 states. [2020-07-20 17:59:07,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:59:07,359 INFO L93 Difference]: Finished difference Result 723 states and 876 transitions. [2020-07-20 17:59:07,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-20 17:59:07,359 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 445 [2020-07-20 17:59:07,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:59:07,361 INFO L225 Difference]: With dead ends: 723 [2020-07-20 17:59:07,362 INFO L226 Difference]: Without dead ends: 538 [2020-07-20 17:59:07,363 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 717 SyntacticMatches, 43 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8085 ImplicationChecksByTransitivity, 19.4s TimeCoverageRelationStatistics Valid=7741, Invalid=22361, Unknown=0, NotChecked=0, Total=30102 [2020-07-20 17:59:07,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2020-07-20 17:59:07,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 366. [2020-07-20 17:59:07,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 366 states. [2020-07-20 17:59:07,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 390 transitions. [2020-07-20 17:59:07,379 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 390 transitions. Word has length 445 [2020-07-20 17:59:07,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:59:07,379 INFO L479 AbstractCegarLoop]: Abstraction has 366 states and 390 transitions. [2020-07-20 17:59:07,379 INFO L480 AbstractCegarLoop]: Interpolant automaton has 131 states. [2020-07-20 17:59:07,379 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 390 transitions. [2020-07-20 17:59:07,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2020-07-20 17:59:07,381 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:07,381 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] [2020-07-20 17:59:07,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:07,582 INFO L427 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:07,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:07,583 INFO L82 PathProgramCache]: Analyzing trace with hash 592048017, now seen corresponding path program 64 times [2020-07-20 17:59:07,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:07,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1623434650] [2020-07-20 17:59:07,584 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:07,758 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:59:07,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:07,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 1092 conjuncts, 90 conjunts are in the unsatisfiable core [2020-07-20 17:59:07,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:15,780 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 17:59:15,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:59:25,307 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 17:59:25,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1623434650] [2020-07-20 17:59:25,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:59:25,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90] total 134 [2020-07-20 17:59:25,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849186686] [2020-07-20 17:59:25,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2020-07-20 17:59:25,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:59:25,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2020-07-20 17:59:25,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2020-07-20 17:59:25,310 INFO L87 Difference]: Start difference. First operand 366 states and 390 transitions. Second operand 134 states. [2020-07-20 17:59:36,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:59:36,197 INFO L93 Difference]: Finished difference Result 727 states and 883 transitions. [2020-07-20 17:59:36,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-07-20 17:59:36,197 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 447 [2020-07-20 17:59:36,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:59:36,200 INFO L225 Difference]: With dead ends: 727 [2020-07-20 17:59:36,200 INFO L226 Difference]: Without dead ends: 544 [2020-07-20 17:59:36,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 937 GetRequests, 717 SyntacticMatches, 44 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8471 ImplicationChecksByTransitivity, 21.3s TimeCoverageRelationStatistics Valid=8097, Invalid=23409, Unknown=0, NotChecked=0, Total=31506 [2020-07-20 17:59:36,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2020-07-20 17:59:36,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 368. [2020-07-20 17:59:36,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-20 17:59:36,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 392 transitions. [2020-07-20 17:59:36,220 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 392 transitions. Word has length 447 [2020-07-20 17:59:36,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:59:36,220 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 392 transitions. [2020-07-20 17:59:36,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 134 states. [2020-07-20 17:59:36,221 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 392 transitions. [2020-07-20 17:59:36,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-20 17:59:36,222 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:36,223 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] [2020-07-20 17:59:36,423 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:36,424 INFO L427 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:36,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:36,424 INFO L82 PathProgramCache]: Analyzing trace with hash -342428042, now seen corresponding path program 65 times [2020-07-20 17:59:36,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:36,425 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1968328664] [2020-07-20 17:59:36,425 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:36,617 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:59:36,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:36,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 1214 conjuncts, 91 conjunts are in the unsatisfiable core [2020-07-20 17:59:36,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:39,323 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:59:39,548 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 17:59:39,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:59:39,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:59:45,160 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 17:59:45,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1968328664] [2020-07-20 17:59:45,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:59:45,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 50 [2020-07-20 17:59:45,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860768316] [2020-07-20 17:59:45,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-20 17:59:45,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:59:45,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-20 17:59:45,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1132, Invalid=1318, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 17:59:45,162 INFO L87 Difference]: Start difference. First operand 368 states and 392 transitions. Second operand 50 states. [2020-07-20 17:59:46,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:59:46,491 INFO L93 Difference]: Finished difference Result 387 states and 413 transitions. [2020-07-20 17:59:46,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-20 17:59:46,493 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 449 [2020-07-20 17:59:46,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:59:46,496 INFO L225 Difference]: With dead ends: 387 [2020-07-20 17:59:46,496 INFO L226 Difference]: Without dead ends: 385 [2020-07-20 17:59:46,496 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 898 GetRequests, 761 SyntacticMatches, 88 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2243 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=1136, Invalid=1414, Unknown=0, NotChecked=0, Total=2550 [2020-07-20 17:59:46,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2020-07-20 17:59:46,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 380. [2020-07-20 17:59:46,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 380 states. [2020-07-20 17:59:46,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 405 transitions. [2020-07-20 17:59:46,514 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 405 transitions. Word has length 449 [2020-07-20 17:59:46,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:59:46,514 INFO L479 AbstractCegarLoop]: Abstraction has 380 states and 405 transitions. [2020-07-20 17:59:46,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-20 17:59:46,515 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 405 transitions. [2020-07-20 17:59:46,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-20 17:59:46,517 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:46,517 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] [2020-07-20 17:59:46,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:46,718 INFO L427 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:46,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:46,719 INFO L82 PathProgramCache]: Analyzing trace with hash -753505192, now seen corresponding path program 66 times [2020-07-20 17:59:46,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:46,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1986619441] [2020-07-20 17:59:46,719 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:46,900 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:59:46,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:46,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 1133 conjuncts, 92 conjunts are in the unsatisfiable core [2020-07-20 17:59:46,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:55,793 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4312 proven. 1980 refuted. 0 times theorem prover too weak. 3788 trivial. 0 not checked. [2020-07-20 17:59:55,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:00:06,605 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4138 proven. 1980 refuted. 0 times theorem prover too weak. 3962 trivial. 0 not checked. [2020-07-20 18:00:06,606 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1986619441] [2020-07-20 18:00:06,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:00:06,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92] total 137 [2020-07-20 18:00:06,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400268544] [2020-07-20 18:00:06,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 137 states [2020-07-20 18:00:06,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:00:06,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2020-07-20 18:00:06,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4276, Invalid=14356, Unknown=0, NotChecked=0, Total=18632 [2020-07-20 18:00:06,608 INFO L87 Difference]: Start difference. First operand 380 states and 405 transitions. Second operand 137 states. [2020-07-20 18:00:17,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:00:17,823 INFO L93 Difference]: Finished difference Result 755 states and 915 transitions. [2020-07-20 18:00:17,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2020-07-20 18:00:17,823 INFO L78 Accepts]: Start accepts. Automaton has 137 states. Word has length 465 [2020-07-20 18:00:17,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:00:17,825 INFO L225 Difference]: With dead ends: 755 [2020-07-20 18:00:17,826 INFO L226 Difference]: Without dead ends: 562 [2020-07-20 18:00:17,828 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 974 GetRequests, 749 SyntacticMatches, 45 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8866 ImplicationChecksByTransitivity, 23.8s TimeCoverageRelationStatistics Valid=8461, Invalid=24481, Unknown=0, NotChecked=0, Total=32942 [2020-07-20 18:00:17,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2020-07-20 18:00:17,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 382. [2020-07-20 18:00:17,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 382 states. [2020-07-20 18:00:17,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 407 transitions. [2020-07-20 18:00:17,844 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 407 transitions. Word has length 465 [2020-07-20 18:00:17,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:00:17,844 INFO L479 AbstractCegarLoop]: Abstraction has 382 states and 407 transitions. [2020-07-20 18:00:17,845 INFO L480 AbstractCegarLoop]: Interpolant automaton has 137 states. [2020-07-20 18:00:17,845 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 407 transitions. [2020-07-20 18:00:17,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-20 18:00:17,848 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:00:17,848 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] [2020-07-20 18:00:18,062 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:00:18,063 INFO L427 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:00:18,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:00:18,064 INFO L82 PathProgramCache]: Analyzing trace with hash -103324675, now seen corresponding path program 67 times [2020-07-20 18:00:18,064 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:00:18,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [792545065] [2020-07-20 18:00:18,065 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:00:18,249 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:00:18,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:00:18,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 1141 conjuncts, 94 conjunts are in the unsatisfiable core [2020-07-20 18:00:18,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:00:27,945 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 18:00:27,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:00:39,668 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 18:00:39,669 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [792545065] [2020-07-20 18:00:39,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:00:39,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94] total 140 [2020-07-20 18:00:39,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573832273] [2020-07-20 18:00:39,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2020-07-20 18:00:39,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:00:39,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2020-07-20 18:00:39,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4463, Invalid=14997, Unknown=0, NotChecked=0, Total=19460 [2020-07-20 18:00:39,671 INFO L87 Difference]: Start difference. First operand 382 states and 407 transitions. Second operand 140 states. [2020-07-20 18:00:51,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:00:51,905 INFO L93 Difference]: Finished difference Result 759 states and 922 transitions. [2020-07-20 18:00:51,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-20 18:00:51,906 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 467 [2020-07-20 18:00:51,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:00:51,908 INFO L225 Difference]: With dead ends: 759 [2020-07-20 18:00:51,908 INFO L226 Difference]: Without dead ends: 568 [2020-07-20 18:00:51,910 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 749 SyntacticMatches, 46 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9270 ImplicationChecksByTransitivity, 26.0s TimeCoverageRelationStatistics Valid=8833, Invalid=25577, Unknown=0, NotChecked=0, Total=34410 [2020-07-20 18:00:51,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2020-07-20 18:00:51,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 384. [2020-07-20 18:00:51,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 384 states. [2020-07-20 18:00:51,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 409 transitions. [2020-07-20 18:00:51,926 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 409 transitions. Word has length 467 [2020-07-20 18:00:51,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:00:51,926 INFO L479 AbstractCegarLoop]: Abstraction has 384 states and 409 transitions. [2020-07-20 18:00:51,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 140 states. [2020-07-20 18:00:51,926 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 409 transitions. [2020-07-20 18:00:51,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-07-20 18:00:51,928 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:00:51,928 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] [2020-07-20 18:00:52,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:00:52,129 INFO L427 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:00:52,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:00:52,130 INFO L82 PathProgramCache]: Analyzing trace with hash 1949894242, now seen corresponding path program 68 times [2020-07-20 18:00:52,131 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:00:52,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1732906154] [2020-07-20 18:00:52,131 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:00:52,333 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:00:52,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:00:52,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 1268 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-20 18:00:52,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:00:55,716 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 18:00:55,970 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 18:00:55,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:00:56,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:01:02,903 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 18:01:02,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1732906154] [2020-07-20 18:01:02,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:01:02,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51] total 52 [2020-07-20 18:01:02,904 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835463192] [2020-07-20 18:01:02,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-20 18:01:02,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:01:02,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-20 18:01:02,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1229, Invalid=1423, Unknown=0, NotChecked=0, Total=2652 [2020-07-20 18:01:02,905 INFO L87 Difference]: Start difference. First operand 384 states and 409 transitions. Second operand 52 states. [2020-07-20 18:01:04,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:01:04,399 INFO L93 Difference]: Finished difference Result 403 states and 430 transitions. [2020-07-20 18:01:04,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-20 18:01:04,402 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 469 [2020-07-20 18:01:04,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:01:04,405 INFO L225 Difference]: With dead ends: 403 [2020-07-20 18:01:04,405 INFO L226 Difference]: Without dead ends: 401 [2020-07-20 18:01:04,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 938 GetRequests, 795 SyntacticMatches, 92 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2437 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=1233, Invalid=1523, Unknown=0, NotChecked=0, Total=2756 [2020-07-20 18:01:04,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2020-07-20 18:01:04,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 396. [2020-07-20 18:01:04,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 396 states. [2020-07-20 18:01:04,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 422 transitions. [2020-07-20 18:01:04,421 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 422 transitions. Word has length 469 [2020-07-20 18:01:04,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:01:04,422 INFO L479 AbstractCegarLoop]: Abstraction has 396 states and 422 transitions. [2020-07-20 18:01:04,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-20 18:01:04,422 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 422 transitions. [2020-07-20 18:01:04,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-20 18:01:04,424 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:01:04,424 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] [2020-07-20 18:01:04,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:01:04,625 INFO L427 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:01:04,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:01:04,626 INFO L82 PathProgramCache]: Analyzing trace with hash 676537412, now seen corresponding path program 69 times [2020-07-20 18:01:04,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:01:04,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [710833433] [2020-07-20 18:01:04,628 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:01:04,814 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:01:04,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:01:04,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 1182 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-20 18:01:04,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:01:15,437 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4692 proven. 2162 refuted. 0 times theorem prover too weak. 4144 trivial. 0 not checked. [2020-07-20 18:01:15,437 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:01:28,254 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4510 proven. 2162 refuted. 0 times theorem prover too weak. 4326 trivial. 0 not checked. [2020-07-20 18:01:28,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [710833433] [2020-07-20 18:01:28,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:01:28,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96] total 143 [2020-07-20 18:01:28,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473208941] [2020-07-20 18:01:28,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 143 states [2020-07-20 18:01:28,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:01:28,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2020-07-20 18:01:28,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4654, Invalid=15652, Unknown=0, NotChecked=0, Total=20306 [2020-07-20 18:01:28,257 INFO L87 Difference]: Start difference. First operand 396 states and 422 transitions. Second operand 143 states. [2020-07-20 18:01:41,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:01:41,988 INFO L93 Difference]: Finished difference Result 787 states and 954 transitions. [2020-07-20 18:01:41,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-20 18:01:41,988 INFO L78 Accepts]: Start accepts. Automaton has 143 states. Word has length 485 [2020-07-20 18:01:41,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:01:41,990 INFO L225 Difference]: With dead ends: 787 [2020-07-20 18:01:41,991 INFO L226 Difference]: Without dead ends: 586 [2020-07-20 18:01:41,993 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1016 GetRequests, 781 SyntacticMatches, 47 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9683 ImplicationChecksByTransitivity, 28.5s TimeCoverageRelationStatistics Valid=9213, Invalid=26697, Unknown=0, NotChecked=0, Total=35910 [2020-07-20 18:01:41,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-07-20 18:01:42,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 398. [2020-07-20 18:01:42,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 398 states. [2020-07-20 18:01:42,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 424 transitions. [2020-07-20 18:01:42,010 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 424 transitions. Word has length 485 [2020-07-20 18:01:42,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:01:42,010 INFO L479 AbstractCegarLoop]: Abstraction has 398 states and 424 transitions. [2020-07-20 18:01:42,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 143 states. [2020-07-20 18:01:42,010 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 424 transitions. [2020-07-20 18:01:42,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-20 18:01:42,012 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:01:42,013 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] [2020-07-20 18:01:42,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:01:42,214 INFO L427 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:01:42,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:01:42,215 INFO L82 PathProgramCache]: Analyzing trace with hash 579393385, now seen corresponding path program 70 times [2020-07-20 18:01:42,215 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:01:42,215 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [44084573] [2020-07-20 18:01:42,215 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:01:42,408 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:01:42,409 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:01:42,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 1190 conjuncts, 98 conjunts are in the unsatisfiable core [2020-07-20 18:01:42,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:01:54,155 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 18:01:54,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:02:08,015 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 18:02:08,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [44084573] [2020-07-20 18:02:08,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:02:08,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98] total 146 [2020-07-20 18:02:08,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297315112] [2020-07-20 18:02:08,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2020-07-20 18:02:08,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:02:08,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2020-07-20 18:02:08,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4849, Invalid=16321, Unknown=0, NotChecked=0, Total=21170 [2020-07-20 18:02:08,019 INFO L87 Difference]: Start difference. First operand 398 states and 424 transitions. Second operand 146 states. [2020-07-20 18:02:23,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:02:23,568 INFO L93 Difference]: Finished difference Result 791 states and 961 transitions. [2020-07-20 18:02:23,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2020-07-20 18:02:23,569 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 487 [2020-07-20 18:02:23,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:02:23,571 INFO L225 Difference]: With dead ends: 791 [2020-07-20 18:02:23,571 INFO L226 Difference]: Without dead ends: 592 [2020-07-20 18:02:23,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 781 SyntacticMatches, 48 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10105 ImplicationChecksByTransitivity, 31.1s TimeCoverageRelationStatistics Valid=9601, Invalid=27841, Unknown=0, NotChecked=0, Total=37442 [2020-07-20 18:02:23,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2020-07-20 18:02:23,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 400. [2020-07-20 18:02:23,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-20 18:02:23,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 426 transitions. [2020-07-20 18:02:23,591 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 426 transitions. Word has length 487 [2020-07-20 18:02:23,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:02:23,591 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 426 transitions. [2020-07-20 18:02:23,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 146 states. [2020-07-20 18:02:23,591 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 426 transitions. [2020-07-20 18:02:23,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-20 18:02:23,593 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:02:23,594 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] [2020-07-20 18:02:23,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:02:23,795 INFO L427 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:02:23,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:02:23,795 INFO L82 PathProgramCache]: Analyzing trace with hash 1713263950, now seen corresponding path program 71 times [2020-07-20 18:02:23,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:02:23,796 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [906174654] [2020-07-20 18:02:23,796 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:02:24,005 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:02:24,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:02:24,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 1322 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-20 18:02:24,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:02:28,022 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 18:02:28,333 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 18:02:28,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:02:28,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:02:36,641 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 18:02:36,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [906174654] [2020-07-20 18:02:36,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:02:36,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 54 [2020-07-20 18:02:36,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [809707040] [2020-07-20 18:02:36,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-07-20 18:02:36,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:02:36,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-07-20 18:02:36,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1330, Invalid=1532, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 18:02:36,644 INFO L87 Difference]: Start difference. First operand 400 states and 426 transitions. Second operand 54 states. [2020-07-20 18:02:38,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:02:38,409 INFO L93 Difference]: Finished difference Result 419 states and 447 transitions. [2020-07-20 18:02:38,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-20 18:02:38,412 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 489 [2020-07-20 18:02:38,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:02:38,416 INFO L225 Difference]: With dead ends: 419 [2020-07-20 18:02:38,416 INFO L226 Difference]: Without dead ends: 417 [2020-07-20 18:02:38,416 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 978 GetRequests, 829 SyntacticMatches, 96 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2639 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=1334, Invalid=1636, Unknown=0, NotChecked=0, Total=2970 [2020-07-20 18:02:38,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2020-07-20 18:02:38,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 412. [2020-07-20 18:02:38,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 412 states. [2020-07-20 18:02:38,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 439 transitions. [2020-07-20 18:02:38,433 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 439 transitions. Word has length 489 [2020-07-20 18:02:38,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:02:38,434 INFO L479 AbstractCegarLoop]: Abstraction has 412 states and 439 transitions. [2020-07-20 18:02:38,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-07-20 18:02:38,434 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 439 transitions. [2020-07-20 18:02:38,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-20 18:02:38,436 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:02:38,437 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] [2020-07-20 18:02:38,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:02:38,638 INFO L427 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:02:38,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:02:38,638 INFO L82 PathProgramCache]: Analyzing trace with hash -831186128, now seen corresponding path program 72 times [2020-07-20 18:02:38,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:02:38,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [550269952] [2020-07-20 18:02:38,639 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:02:38,835 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:02:38,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:02:38,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 1231 conjuncts, 100 conjunts are in the unsatisfiable core [2020-07-20 18:02:38,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:02:51,526 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 5088 proven. 2352 refuted. 0 times theorem prover too weak. 4516 trivial. 0 not checked. [2020-07-20 18:02:51,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:03:06,724 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 4898 proven. 2352 refuted. 0 times theorem prover too weak. 4706 trivial. 0 not checked. [2020-07-20 18:03:06,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [550269952] [2020-07-20 18:03:06,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:03:06,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100] total 149 [2020-07-20 18:03:06,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932267882] [2020-07-20 18:03:06,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 149 states [2020-07-20 18:03:06,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:03:06,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2020-07-20 18:03:06,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5048, Invalid=17004, Unknown=0, NotChecked=0, Total=22052 [2020-07-20 18:03:06,727 INFO L87 Difference]: Start difference. First operand 412 states and 439 transitions. Second operand 149 states. [2020-07-20 18:03:22,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:03:22,771 INFO L93 Difference]: Finished difference Result 819 states and 993 transitions. [2020-07-20 18:03:22,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-20 18:03:22,772 INFO L78 Accepts]: Start accepts. Automaton has 149 states. Word has length 505 [2020-07-20 18:03:22,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:03:22,774 INFO L225 Difference]: With dead ends: 819 [2020-07-20 18:03:22,774 INFO L226 Difference]: Without dead ends: 610 [2020-07-20 18:03:22,778 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1058 GetRequests, 813 SyntacticMatches, 49 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10536 ImplicationChecksByTransitivity, 33.9s TimeCoverageRelationStatistics Valid=9997, Invalid=29009, Unknown=0, NotChecked=0, Total=39006 [2020-07-20 18:03:22,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2020-07-20 18:03:22,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 414. [2020-07-20 18:03:22,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2020-07-20 18:03:22,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 441 transitions. [2020-07-20 18:03:22,795 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 441 transitions. Word has length 505 [2020-07-20 18:03:22,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:03:22,795 INFO L479 AbstractCegarLoop]: Abstraction has 414 states and 441 transitions. [2020-07-20 18:03:22,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 149 states. [2020-07-20 18:03:22,795 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 441 transitions. [2020-07-20 18:03:22,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 18:03:22,798 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:03:22,798 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] [2020-07-20 18:03:22,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:03:22,999 INFO L427 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:03:22,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:03:23,000 INFO L82 PathProgramCache]: Analyzing trace with hash 1643039189, now seen corresponding path program 73 times [2020-07-20 18:03:23,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:03:23,000 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [159654796] [2020-07-20 18:03:23,001 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:03:23,201 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:03:23,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:03:23,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 1239 conjuncts, 102 conjunts are in the unsatisfiable core [2020-07-20 18:03:23,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:03:36,755 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 18:03:36,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:03:53,066 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 18:03:53,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [159654796] [2020-07-20 18:03:53,067 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:03:53,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102] total 152 [2020-07-20 18:03:53,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66998981] [2020-07-20 18:03:53,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2020-07-20 18:03:53,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:03:53,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2020-07-20 18:03:53,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5251, Invalid=17701, Unknown=0, NotChecked=0, Total=22952 [2020-07-20 18:03:53,070 INFO L87 Difference]: Start difference. First operand 414 states and 441 transitions. Second operand 152 states. [2020-07-20 18:04:11,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:04:11,169 INFO L93 Difference]: Finished difference Result 823 states and 1000 transitions. [2020-07-20 18:04:11,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2020-07-20 18:04:11,169 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 507 [2020-07-20 18:04:11,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:04:11,172 INFO L225 Difference]: With dead ends: 823 [2020-07-20 18:04:11,172 INFO L226 Difference]: Without dead ends: 616 [2020-07-20 18:04:11,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1063 GetRequests, 813 SyntacticMatches, 50 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10976 ImplicationChecksByTransitivity, 36.3s TimeCoverageRelationStatistics Valid=10401, Invalid=30201, Unknown=0, NotChecked=0, Total=40602 [2020-07-20 18:04:11,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2020-07-20 18:04:11,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 416. [2020-07-20 18:04:11,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 416 states. [2020-07-20 18:04:11,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 443 transitions. [2020-07-20 18:04:11,193 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 443 transitions. Word has length 507 [2020-07-20 18:04:11,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:04:11,193 INFO L479 AbstractCegarLoop]: Abstraction has 416 states and 443 transitions. [2020-07-20 18:04:11,193 INFO L480 AbstractCegarLoop]: Interpolant automaton has 152 states. [2020-07-20 18:04:11,193 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 443 transitions. [2020-07-20 18:04:11,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 510 [2020-07-20 18:04:11,196 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:04:11,196 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] [2020-07-20 18:04:11,397 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:04:11,397 INFO L427 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:04:11,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:04:11,398 INFO L82 PathProgramCache]: Analyzing trace with hash -38313158, now seen corresponding path program 74 times [2020-07-20 18:04:11,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:04:11,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [315621619] [2020-07-20 18:04:11,399 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:04:11,620 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:04:11,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:04:11,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 1376 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-20 18:04:11,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:04:16,259 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 18:04:16,575 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 18:04:16,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:04:16,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:04:26,166 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 18:04:26,166 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [315621619] [2020-07-20 18:04:26,166 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:04:26,167 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55] total 56 [2020-07-20 18:04:26,167 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975607180] [2020-07-20 18:04:26,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-20 18:04:26,168 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:04:26,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-20 18:04:26,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1435, Invalid=1645, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 18:04:26,168 INFO L87 Difference]: Start difference. First operand 416 states and 443 transitions. Second operand 56 states. [2020-07-20 18:04:28,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:04:28,152 INFO L93 Difference]: Finished difference Result 435 states and 464 transitions. [2020-07-20 18:04:28,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-20 18:04:28,156 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 509 [2020-07-20 18:04:28,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:04:28,160 INFO L225 Difference]: With dead ends: 435 [2020-07-20 18:04:28,160 INFO L226 Difference]: Without dead ends: 433 [2020-07-20 18:04:28,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1018 GetRequests, 863 SyntacticMatches, 100 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2849 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=1439, Invalid=1753, Unknown=0, NotChecked=0, Total=3192 [2020-07-20 18:04:28,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2020-07-20 18:04:28,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 428. [2020-07-20 18:04:28,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 428 states. [2020-07-20 18:04:28,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 456 transitions. [2020-07-20 18:04:28,184 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 456 transitions. Word has length 509 [2020-07-20 18:04:28,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:04:28,184 INFO L479 AbstractCegarLoop]: Abstraction has 428 states and 456 transitions. [2020-07-20 18:04:28,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-20 18:04:28,184 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 456 transitions. [2020-07-20 18:04:28,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 526 [2020-07-20 18:04:28,187 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:04:28,187 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] [2020-07-20 18:04:28,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:04:28,390 INFO L427 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:04:28,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:04:28,391 INFO L82 PathProgramCache]: Analyzing trace with hash 283955484, now seen corresponding path program 75 times [2020-07-20 18:04:28,391 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:04:28,391 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047497020] [2020-07-20 18:04:28,392 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:04:28,595 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:04:28,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:04:28,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 1280 conjuncts, 104 conjunts are in the unsatisfiable core [2020-07-20 18:04:28,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:04:43,382 INFO L134 CoverageAnalysis]: Checked inductivity of 12954 backedges. 5500 proven. 2550 refuted. 0 times theorem prover too weak. 4904 trivial. 0 not checked. [2020-07-20 18:04:43,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:05:00,976 INFO L134 CoverageAnalysis]: Checked inductivity of 12954 backedges. 5302 proven. 2550 refuted. 0 times theorem prover too weak. 5102 trivial. 0 not checked. [2020-07-20 18:05:00,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047497020] [2020-07-20 18:05:00,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:05:00,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 104] total 155 [2020-07-20 18:05:00,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484925734] [2020-07-20 18:05:00,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 155 states [2020-07-20 18:05:00,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:05:00,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2020-07-20 18:05:00,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5458, Invalid=18412, Unknown=0, NotChecked=0, Total=23870 [2020-07-20 18:05:00,980 INFO L87 Difference]: Start difference. First operand 428 states and 456 transitions. Second operand 155 states. [2020-07-20 18:05:20,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:05:20,364 INFO L93 Difference]: Finished difference Result 851 states and 1032 transitions. [2020-07-20 18:05:20,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2020-07-20 18:05:20,365 INFO L78 Accepts]: Start accepts. Automaton has 155 states. Word has length 525 [2020-07-20 18:05:20,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:05:20,368 INFO L225 Difference]: With dead ends: 851 [2020-07-20 18:05:20,368 INFO L226 Difference]: Without dead ends: 634 [2020-07-20 18:05:20,373 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1100 GetRequests, 845 SyntacticMatches, 51 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11425 ImplicationChecksByTransitivity, 39.4s TimeCoverageRelationStatistics Valid=10813, Invalid=31417, Unknown=0, NotChecked=0, Total=42230 [2020-07-20 18:05:20,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2020-07-20 18:05:20,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 430. [2020-07-20 18:05:20,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 430 states. [2020-07-20 18:05:20,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 458 transitions. [2020-07-20 18:05:20,400 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 458 transitions. Word has length 525 [2020-07-20 18:05:20,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:05:20,401 INFO L479 AbstractCegarLoop]: Abstraction has 430 states and 458 transitions. [2020-07-20 18:05:20,401 INFO L480 AbstractCegarLoop]: Interpolant automaton has 155 states. [2020-07-20 18:05:20,401 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 458 transitions. [2020-07-20 18:05:20,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 528 [2020-07-20 18:05:20,406 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:05:20,406 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] [2020-07-20 18:05:20,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:05:20,621 INFO L427 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:05:20,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:05:20,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1129954113, now seen corresponding path program 76 times [2020-07-20 18:05:20,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:05:20,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [270127051] [2020-07-20 18:05:20,623 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:05:20,829 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:05:20,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:05:20,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 1288 conjuncts, 106 conjunts are in the unsatisfiable core [2020-07-20 18:05:20,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:05:36,626 INFO L134 CoverageAnalysis]: Checked inductivity of 13056 backedges. 5304 proven. 2652 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-20 18:05:36,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:05:55,506 INFO L134 CoverageAnalysis]: Checked inductivity of 13056 backedges. 5304 proven. 2652 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-20 18:05:55,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [270127051] [2020-07-20 18:05:55,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:05:55,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106] total 158 [2020-07-20 18:05:55,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743412493] [2020-07-20 18:05:55,508 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2020-07-20 18:05:55,508 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:05:55,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2020-07-20 18:05:55,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5669, Invalid=19137, Unknown=0, NotChecked=0, Total=24806 [2020-07-20 18:05:55,510 INFO L87 Difference]: Start difference. First operand 430 states and 458 transitions. Second operand 158 states. [2020-07-20 18:06:15,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:06:15,317 INFO L93 Difference]: Finished difference Result 855 states and 1039 transitions. [2020-07-20 18:06:15,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-07-20 18:06:15,318 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 527 [2020-07-20 18:06:15,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:06:15,321 INFO L225 Difference]: With dead ends: 855 [2020-07-20 18:06:15,321 INFO L226 Difference]: Without dead ends: 640 [2020-07-20 18:06:15,325 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1105 GetRequests, 845 SyntacticMatches, 52 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11883 ImplicationChecksByTransitivity, 41.8s TimeCoverageRelationStatistics Valid=11233, Invalid=32657, Unknown=0, NotChecked=0, Total=43890 [2020-07-20 18:06:15,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 640 states. [2020-07-20 18:06:15,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 640 to 432. [2020-07-20 18:06:15,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 432 states. [2020-07-20 18:06:15,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 460 transitions. [2020-07-20 18:06:15,353 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 460 transitions. Word has length 527 [2020-07-20 18:06:15,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:06:15,353 INFO L479 AbstractCegarLoop]: Abstraction has 432 states and 460 transitions. [2020-07-20 18:06:15,354 INFO L480 AbstractCegarLoop]: Interpolant automaton has 158 states. [2020-07-20 18:06:15,354 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 460 transitions. [2020-07-20 18:06:15,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 530 [2020-07-20 18:06:15,358 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:06:15,358 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] [2020-07-20 18:06:15,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:06:15,572 INFO L427 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:06:15,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:06:15,573 INFO L82 PathProgramCache]: Analyzing trace with hash -1909149658, now seen corresponding path program 77 times [2020-07-20 18:06:15,573 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:06:15,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1823814133] [2020-07-20 18:06:15,573 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:06:15,881 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:06:15,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:06:15,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 1430 conjuncts, 107 conjunts are in the unsatisfiable core [2020-07-20 18:06:15,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:06:21,039 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 18:06:21,397 INFO L134 CoverageAnalysis]: Checked inductivity of 13160 backedges. 2858 proven. 5202 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-20 18:06:21,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:06:21,607 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:06:32,135 INFO L134 CoverageAnalysis]: Checked inductivity of 13160 backedges. 2858 proven. 5202 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-20 18:06:32,135 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1823814133] [2020-07-20 18:06:32,135 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:06:32,135 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57] total 58 [2020-07-20 18:06:32,135 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426702178] [2020-07-20 18:06:32,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-07-20 18:06:32,136 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:06:32,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-07-20 18:06:32,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1544, Invalid=1762, Unknown=0, NotChecked=0, Total=3306 [2020-07-20 18:06:32,137 INFO L87 Difference]: Start difference. First operand 432 states and 460 transitions. Second operand 58 states.