/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 NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:44:10,402 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:44:10,405 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:44:10,423 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:44:10,424 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:44:10,425 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:44:10,427 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:44:10,429 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:44:10,432 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:44:10,433 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:44:10,434 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:44:10,436 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:44:10,436 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:44:10,438 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:44:10,439 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:44:10,441 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:44:10,442 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:44:10,444 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:44:10,446 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:44:10,448 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:44:10,450 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:44:10,452 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:44:10,454 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:44:10,455 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:44:10,458 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 11:44:10,468 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:44:10,469 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:44:10,470 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:44:10,471 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 11:44:10,488 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:44:10,489 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:44:10,490 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:44:10,491 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:44:10,491 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:44:10,491 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:44:10,491 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:44:10,492 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:44:10,492 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:44:10,492 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:44:10,492 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:44:10,492 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:44:10,493 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:44:10,493 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:44:10,493 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:44:10,493 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:44:10,493 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:44:10,494 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:44:10,494 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:44:10,494 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:44:10,494 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:44:10,495 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:44:10,495 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:44:10,495 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:44:10,495 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:44:10,495 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:44:10,496 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:10,496 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:44:10,496 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:44:10,496 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 -> NOT_INCREMENTALLY [2020-07-21 11:44:10,813 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:44:10,829 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:44:10,834 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:44:10,836 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:44:10,837 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:44:10,838 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-21 11:44:10,949 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2aaf1d05d/25c74e4e05054b9a9260763c580bf87a/FLAG215038ad0 [2020-07-21 11:44:11,545 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:44:11,546 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-21 11:44:11,561 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2aaf1d05d/25c74e4e05054b9a9260763c580bf87a/FLAG215038ad0 [2020-07-21 11:44:11,859 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2aaf1d05d/25c74e4e05054b9a9260763c580bf87a [2020-07-21 11:44:11,873 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:44:11,877 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:44:11,879 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:44:11,879 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:44:11,884 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:44:11,886 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:44:11" (1/1) ... [2020-07-21 11:44:11,890 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1542a85c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:44:11, skipping insertion in model container [2020-07-21 11:44:11,890 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:44:11" (1/1) ... [2020-07-21 11:44:11,901 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:44:11,926 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:44:12,151 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:44:12,157 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:44:12,177 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:44:12,194 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:44:12,195 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:44:12 WrapperNode [2020-07-21 11:44:12,195 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:44:12,196 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:44:12,197 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:44:12,197 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:44:12,212 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:44:12" (1/1) ... [2020-07-21 11:44:12,212 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:44:12" (1/1) ... [2020-07-21 11:44:12,218 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:44:12" (1/1) ... [2020-07-21 11:44:12,219 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:44:12" (1/1) ... [2020-07-21 11:44:12,313 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:44:12" (1/1) ... [2020-07-21 11:44:12,326 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:44:12" (1/1) ... [2020-07-21 11:44:12,335 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:44:12" (1/1) ... [2020-07-21 11:44:12,339 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:44:12,340 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:44:12,341 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:44:12,341 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:44:12,342 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:44:12" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:44:12,416 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:44:12,416 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:44:12,416 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 11:44:12,417 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 11:44:12,417 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:44:12,417 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:44:12,417 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 11:44:12,417 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 11:44:12,418 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 11:44:12,418 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 11:44:12,418 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:44:12,418 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:44:12,419 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:44:12,680 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:44:12,681 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 11:44:12,687 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:44:12 BoogieIcfgContainer [2020-07-21 11:44:12,688 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:44:12,690 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:44:12,690 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:44:12,695 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:44:12,696 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:44:11" (1/3) ... [2020-07-21 11:44:12,697 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d671f2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:44:12, skipping insertion in model container [2020-07-21 11:44:12,698 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:44:12" (2/3) ... [2020-07-21 11:44:12,698 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d671f2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:44:12, skipping insertion in model container [2020-07-21 11:44:12,698 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:44:12" (3/3) ... [2020-07-21 11:44:12,701 INFO L109 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2020-07-21 11:44:12,718 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:44:12,733 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:44:12,761 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:44:12,828 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:44:12,829 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:44:12,829 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:44:12,830 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:44:12,830 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:44:12,830 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:44:12,831 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:44:12,831 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:44:12,861 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-21 11:44:12,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 11:44:12,871 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:12,873 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:12,874 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:12,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:12,883 INFO L82 PathProgramCache]: Analyzing trace with hash 317368997, now seen corresponding path program 1 times [2020-07-21 11:44:12,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:12,895 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [414259976] [2020-07-21 11:44:12,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:12,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:12,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 11:44:12,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:13,008 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:44:13,009 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:44:13,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [414259976] [2020-07-21 11:44:13,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:44:13,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 11:44:13,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474203747] [2020-07-21 11:44:13,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 11:44:13,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:13,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 11:44:13,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 11:44:13,035 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2020-07-21 11:44:13,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:13,072 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2020-07-21 11:44:13,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 11:44:13,074 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2020-07-21 11:44:13,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:13,085 INFO L225 Difference]: With dead ends: 47 [2020-07-21 11:44:13,085 INFO L226 Difference]: Without dead ends: 22 [2020-07-21 11:44:13,094 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 [2020-07-21 11:44:13,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-21 11:44:13,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-21 11:44:13,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-21 11:44:13,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-07-21 11:44:13,138 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 15 [2020-07-21 11:44:13,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:13,139 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-07-21 11:44:13,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 11:44:13,139 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-07-21 11:44:13,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 11:44:13,140 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:13,141 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:13,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:13,356 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:13,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:13,357 INFO L82 PathProgramCache]: Analyzing trace with hash 1632722591, now seen corresponding path program 1 times [2020-07-21 11:44:13,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:13,358 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2003666986] [2020-07-21 11:44:13,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:13,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:13,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 11:44:13,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:13,458 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:44:13,507 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:44:13,507 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:44:13,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2003666986] [2020-07-21 11:44:13,508 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:44:13,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 11:44:13,509 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589764332] [2020-07-21 11:44:13,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 11:44:13,511 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:13,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 11:44:13,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 11:44:13,512 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 5 states. [2020-07-21 11:44:13,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:13,586 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2020-07-21 11:44:13,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 11:44:13,587 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-21 11:44:13,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:13,589 INFO L225 Difference]: With dead ends: 31 [2020-07-21 11:44:13,589 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 11:44:13,591 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 [2020-07-21 11:44:13,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 11:44:13,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2020-07-21 11:44:13,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 11:44:13,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-07-21 11:44:13,602 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 17 [2020-07-21 11:44:13,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:13,603 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-07-21 11:44:13,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 11:44:13,603 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-07-21 11:44:13,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 11:44:13,604 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:13,605 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:13,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:13,820 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:13,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:13,821 INFO L82 PathProgramCache]: Analyzing trace with hash -1401298672, now seen corresponding path program 1 times [2020-07-21 11:44:13,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:13,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1113308370] [2020-07-21 11:44:13,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:13,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:13,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 11:44:13,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:13,947 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:44:13,947 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:44:13,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1113308370] [2020-07-21 11:44:13,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:44:13,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 11:44:13,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222584494] [2020-07-21 11:44:13,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 11:44:13,950 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:13,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 11:44:13,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-21 11:44:13,951 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 5 states. [2020-07-21 11:44:14,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:14,054 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2020-07-21 11:44:14,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 11:44:14,055 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2020-07-21 11:44:14,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:14,060 INFO L225 Difference]: With dead ends: 49 [2020-07-21 11:44:14,061 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 11:44:14,062 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-21 11:44:14,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 11:44:14,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2020-07-21 11:44:14,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 11:44:14,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2020-07-21 11:44:14,077 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 25 [2020-07-21 11:44:14,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:14,078 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2020-07-21 11:44:14,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 11:44:14,078 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2020-07-21 11:44:14,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 11:44:14,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:14,079 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:14,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:14,295 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:14,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:14,296 INFO L82 PathProgramCache]: Analyzing trace with hash 1107622837, now seen corresponding path program 1 times [2020-07-21 11:44:14,296 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:14,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [588260474] [2020-07-21 11:44:14,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:14,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:14,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 11:44:14,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:14,410 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:44:14,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:14,478 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:44:14,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [588260474] [2020-07-21 11:44:14,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:14,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-21 11:44:14,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23974407] [2020-07-21 11:44:14,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 11:44:14,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:14,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 11:44:14,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 11:44:14,482 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 8 states. [2020-07-21 11:44:14,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:14,648 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2020-07-21 11:44:14,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 11:44:14,649 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-21 11:44:14,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:14,651 INFO L225 Difference]: With dead ends: 55 [2020-07-21 11:44:14,651 INFO L226 Difference]: Without dead ends: 40 [2020-07-21 11:44:14,652 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-21 11:44:14,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-21 11:44:14,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2020-07-21 11:44:14,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 11:44:14,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-21 11:44:14,661 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 27 [2020-07-21 11:44:14,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:14,662 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-21 11:44:14,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 11:44:14,662 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-21 11:44:14,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 11:44:14,664 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:14,664 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:14,880 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:14,880 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:14,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:14,881 INFO L82 PathProgramCache]: Analyzing trace with hash -1590427366, now seen corresponding path program 2 times [2020-07-21 11:44:14,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:14,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [318516206] [2020-07-21 11:44:14,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:14,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:14,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 11:44:14,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:14,968 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:44:14,995 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:44:14,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:15,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:44:15,070 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:44:15,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [318516206] [2020-07-21 11:44:15,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:15,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-07-21 11:44:15,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986412142] [2020-07-21 11:44:15,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 11:44:15,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:15,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 11:44:15,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 11:44:15,074 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 8 states. [2020-07-21 11:44:15,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:15,181 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2020-07-21 11:44:15,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 11:44:15,182 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-21 11:44:15,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:15,183 INFO L225 Difference]: With dead ends: 51 [2020-07-21 11:44:15,183 INFO L226 Difference]: Without dead ends: 49 [2020-07-21 11:44:15,184 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 11:44:15,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-21 11:44:15,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 44. [2020-07-21 11:44:15,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 11:44:15,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-07-21 11:44:15,195 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 29 [2020-07-21 11:44:15,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:15,196 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-07-21 11:44:15,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 11:44:15,196 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-07-21 11:44:15,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-21 11:44:15,199 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:15,199 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:15,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:15,414 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:15,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:15,415 INFO L82 PathProgramCache]: Analyzing trace with hash -30298372, now seen corresponding path program 3 times [2020-07-21 11:44:15,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:15,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1960239377] [2020-07-21 11:44:15,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:15,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:15,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 11:44:15,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:15,544 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 28 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-21 11:44:15,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:15,623 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-07-21 11:44:15,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1960239377] [2020-07-21 11:44:15,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:15,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-21 11:44:15,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493214903] [2020-07-21 11:44:15,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 11:44:15,626 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:15,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 11:44:15,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-07-21 11:44:15,627 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 11 states. [2020-07-21 11:44:15,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:15,791 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2020-07-21 11:44:15,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 11:44:15,792 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 45 [2020-07-21 11:44:15,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:15,795 INFO L225 Difference]: With dead ends: 83 [2020-07-21 11:44:15,795 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 11:44:15,796 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-07-21 11:44:15,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 11:44:15,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 46. [2020-07-21 11:44:15,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 11:44:15,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-07-21 11:44:15,807 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 45 [2020-07-21 11:44:15,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:15,807 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-07-21 11:44:15,807 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 11:44:15,807 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-07-21 11:44:15,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-07-21 11:44:15,809 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:15,809 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:16,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:16,024 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:16,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:16,025 INFO L82 PathProgramCache]: Analyzing trace with hash 130155809, now seen corresponding path program 4 times [2020-07-21 11:44:16,025 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:16,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2064981204] [2020-07-21 11:44:16,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:16,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:16,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 11:44:16,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:16,182 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 11:44:16,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:16,291 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 11:44:16,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2064981204] [2020-07-21 11:44:16,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:16,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-21 11:44:16,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80596062] [2020-07-21 11:44:16,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 11:44:16,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:16,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 11:44:16,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2020-07-21 11:44:16,295 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 14 states. [2020-07-21 11:44:16,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:16,554 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2020-07-21 11:44:16,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 11:44:16,554 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 47 [2020-07-21 11:44:16,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:16,560 INFO L225 Difference]: With dead ends: 87 [2020-07-21 11:44:16,561 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 11:44:16,562 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 77 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2020-07-21 11:44:16,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 11:44:16,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 48. [2020-07-21 11:44:16,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 11:44:16,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2020-07-21 11:44:16,585 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 47 [2020-07-21 11:44:16,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:16,585 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2020-07-21 11:44:16,585 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 11:44:16,586 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2020-07-21 11:44:16,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 11:44:16,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:16,593 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:16,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:16,807 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:16,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:16,808 INFO L82 PathProgramCache]: Analyzing trace with hash -292198906, now seen corresponding path program 5 times [2020-07-21 11:44:16,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:16,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1358750864] [2020-07-21 11:44:16,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:16,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:16,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 11:44:16,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:16,916 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:44:16,934 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 11:44:16,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:16,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:44:17,035 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 11:44:17,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1358750864] [2020-07-21 11:44:17,036 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:17,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-07-21 11:44:17,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522494625] [2020-07-21 11:44:17,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 11:44:17,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:17,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 11:44:17,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-07-21 11:44:17,038 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 10 states. [2020-07-21 11:44:17,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:17,149 INFO L93 Difference]: Finished difference Result 67 states and 73 transitions. [2020-07-21 11:44:17,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 11:44:17,150 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 49 [2020-07-21 11:44:17,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:17,151 INFO L225 Difference]: With dead ends: 67 [2020-07-21 11:44:17,152 INFO L226 Difference]: Without dead ends: 65 [2020-07-21 11:44:17,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 81 SyntacticMatches, 8 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 11:44:17,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-21 11:44:17,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2020-07-21 11:44:17,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 11:44:17,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2020-07-21 11:44:17,162 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 49 [2020-07-21 11:44:17,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:17,163 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2020-07-21 11:44:17,163 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 11:44:17,163 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2020-07-21 11:44:17,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 11:44:17,165 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:17,165 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:17,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:17,375 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:17,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:17,376 INFO L82 PathProgramCache]: Analyzing trace with hash 551795688, now seen corresponding path program 6 times [2020-07-21 11:44:17,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:17,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2088052977] [2020-07-21 11:44:17,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:17,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:17,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 11:44:17,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:17,590 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 72 proven. 20 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 11:44:17,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:17,716 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 58 proven. 20 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-07-21 11:44:17,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2088052977] [2020-07-21 11:44:17,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:17,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-21 11:44:17,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999817371] [2020-07-21 11:44:17,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 11:44:17,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:17,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 11:44:17,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2020-07-21 11:44:17,719 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand 17 states. [2020-07-21 11:44:17,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:17,989 INFO L93 Difference]: Finished difference Result 115 states and 135 transitions. [2020-07-21 11:44:17,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 11:44:17,989 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 65 [2020-07-21 11:44:17,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:17,991 INFO L225 Difference]: With dead ends: 115 [2020-07-21 11:44:17,991 INFO L226 Difference]: Without dead ends: 82 [2020-07-21 11:44:17,992 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 109 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2020-07-21 11:44:17,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-21 11:44:18,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 62. [2020-07-21 11:44:18,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-21 11:44:18,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2020-07-21 11:44:18,002 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 65 [2020-07-21 11:44:18,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:18,002 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2020-07-21 11:44:18,002 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 11:44:18,002 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2020-07-21 11:44:18,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 11:44:18,004 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:18,004 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:18,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:18,219 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:18,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:18,219 INFO L82 PathProgramCache]: Analyzing trace with hash -150434419, now seen corresponding path program 7 times [2020-07-21 11:44:18,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:18,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [560037874] [2020-07-21 11:44:18,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:18,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:18,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 11:44:18,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:18,421 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 11:44:18,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:18,598 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 11:44:18,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [560037874] [2020-07-21 11:44:18,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:18,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 20 [2020-07-21 11:44:18,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622232193] [2020-07-21 11:44:18,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 11:44:18,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:18,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 11:44:18,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2020-07-21 11:44:18,603 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand 20 states. [2020-07-21 11:44:18,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:18,938 INFO L93 Difference]: Finished difference Result 119 states and 142 transitions. [2020-07-21 11:44:18,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 11:44:18,938 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2020-07-21 11:44:18,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:18,943 INFO L225 Difference]: With dead ends: 119 [2020-07-21 11:44:18,944 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 11:44:18,945 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 109 SyntacticMatches, 6 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2020-07-21 11:44:18,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 11:44:18,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 64. [2020-07-21 11:44:18,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 11:44:18,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2020-07-21 11:44:18,976 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 67 [2020-07-21 11:44:18,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:18,976 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2020-07-21 11:44:18,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 11:44:18,977 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2020-07-21 11:44:18,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-21 11:44:18,983 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:18,983 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:19,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:19,187 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:19,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:19,188 INFO L82 PathProgramCache]: Analyzing trace with hash -683701774, now seen corresponding path program 8 times [2020-07-21 11:44:19,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:19,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [477445644] [2020-07-21 11:44:19,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:19,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:19,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 11:44:19,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:19,337 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:44:19,358 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 11:44:19,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:19,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:44:19,497 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 11:44:19,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [477445644] [2020-07-21 11:44:19,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:19,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-07-21 11:44:19,500 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268745330] [2020-07-21 11:44:19,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 11:44:19,501 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:19,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 11:44:19,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-07-21 11:44:19,506 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand 12 states. [2020-07-21 11:44:19,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:19,637 INFO L93 Difference]: Finished difference Result 83 states and 90 transitions. [2020-07-21 11:44:19,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 11:44:19,641 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 69 [2020-07-21 11:44:19,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:19,644 INFO L225 Difference]: With dead ends: 83 [2020-07-21 11:44:19,645 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 11:44:19,646 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 115 SyntacticMatches, 12 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2020-07-21 11:44:19,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 11:44:19,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 76. [2020-07-21 11:44:19,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 11:44:19,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2020-07-21 11:44:19,660 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 69 [2020-07-21 11:44:19,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:19,661 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2020-07-21 11:44:19,661 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 11:44:19,661 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2020-07-21 11:44:19,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-21 11:44:19,663 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:19,664 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:19,875 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:19,875 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:19,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:19,876 INFO L82 PathProgramCache]: Analyzing trace with hash 192972756, now seen corresponding path program 9 times [2020-07-21 11:44:19,876 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:19,877 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2065239653] [2020-07-21 11:44:19,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:19,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:19,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 11:44:19,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:20,133 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 132 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-21 11:44:20,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:20,356 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 110 proven. 42 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2020-07-21 11:44:20,357 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2065239653] [2020-07-21 11:44:20,358 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:20,358 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 23 [2020-07-21 11:44:20,358 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238109590] [2020-07-21 11:44:20,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 11:44:20,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:20,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 11:44:20,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 11:44:20,367 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 23 states. [2020-07-21 11:44:20,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:20,796 INFO L93 Difference]: Finished difference Result 147 states and 174 transitions. [2020-07-21 11:44:20,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 11:44:20,796 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 85 [2020-07-21 11:44:20,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:20,801 INFO L225 Difference]: With dead ends: 147 [2020-07-21 11:44:20,801 INFO L226 Difference]: Without dead ends: 106 [2020-07-21 11:44:20,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 141 SyntacticMatches, 7 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2020-07-21 11:44:20,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-21 11:44:20,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 78. [2020-07-21 11:44:20,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-21 11:44:20,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2020-07-21 11:44:20,840 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 85 [2020-07-21 11:44:20,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:20,840 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2020-07-21 11:44:20,840 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 11:44:20,841 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2020-07-21 11:44:20,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-07-21 11:44:20,847 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:20,847 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:21,063 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:21,064 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:21,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:21,064 INFO L82 PathProgramCache]: Analyzing trace with hash 1722356985, now seen corresponding path program 10 times [2020-07-21 11:44:21,065 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:21,065 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1709127584] [2020-07-21 11:44:21,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:21,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:21,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 11:44:21,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:21,329 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 11:44:21,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:21,568 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 11:44:21,569 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1709127584] [2020-07-21 11:44:21,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:21,570 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 26 [2020-07-21 11:44:21,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427752775] [2020-07-21 11:44:21,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 11:44:21,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:21,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 11:44:21,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2020-07-21 11:44:21,573 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 26 states. [2020-07-21 11:44:21,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:21,964 INFO L93 Difference]: Finished difference Result 151 states and 181 transitions. [2020-07-21 11:44:21,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 11:44:21,965 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 87 [2020-07-21 11:44:21,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:21,966 INFO L225 Difference]: With dead ends: 151 [2020-07-21 11:44:21,967 INFO L226 Difference]: Without dead ends: 112 [2020-07-21 11:44:21,968 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 141 SyntacticMatches, 8 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 11:44:21,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-21 11:44:21,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 80. [2020-07-21 11:44:21,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 11:44:21,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2020-07-21 11:44:21,988 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 87 [2020-07-21 11:44:21,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:21,989 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2020-07-21 11:44:21,989 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 11:44:21,989 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2020-07-21 11:44:21,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-07-21 11:44:21,990 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:21,990 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:22,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:22,192 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:22,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:22,193 INFO L82 PathProgramCache]: Analyzing trace with hash -1713181474, now seen corresponding path program 11 times [2020-07-21 11:44:22,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:22,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [726504717] [2020-07-21 11:44:22,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:22,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:22,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 11:44:22,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:22,342 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:44:22,367 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 11:44:22,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:22,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:44:22,534 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 11:44:22,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [726504717] [2020-07-21 11:44:22,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:22,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-07-21 11:44:22,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625836186] [2020-07-21 11:44:22,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 11:44:22,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:22,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 11:44:22,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-07-21 11:44:22,539 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 14 states. [2020-07-21 11:44:22,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:22,699 INFO L93 Difference]: Finished difference Result 99 states and 107 transitions. [2020-07-21 11:44:22,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 11:44:22,700 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 89 [2020-07-21 11:44:22,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:22,702 INFO L225 Difference]: With dead ends: 99 [2020-07-21 11:44:22,702 INFO L226 Difference]: Without dead ends: 97 [2020-07-21 11:44:22,703 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 149 SyntacticMatches, 16 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2020-07-21 11:44:22,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-21 11:44:22,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 92. [2020-07-21 11:44:22,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-21 11:44:22,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions. [2020-07-21 11:44:22,712 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 89 [2020-07-21 11:44:22,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:22,713 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 99 transitions. [2020-07-21 11:44:22,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 11:44:22,713 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions. [2020-07-21 11:44:22,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-07-21 11:44:22,714 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:22,715 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:22,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:22,928 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:22,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:22,929 INFO L82 PathProgramCache]: Analyzing trace with hash -1950838080, now seen corresponding path program 12 times [2020-07-21 11:44:22,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:22,930 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2051959736] [2020-07-21 11:44:22,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:22,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:22,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 11:44:22,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:23,232 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 208 proven. 72 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-21 11:44:23,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:23,533 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 178 proven. 72 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2020-07-21 11:44:23,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2051959736] [2020-07-21 11:44:23,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:23,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 29 [2020-07-21 11:44:23,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086360985] [2020-07-21 11:44:23,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 11:44:23,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:23,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 11:44:23,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2020-07-21 11:44:23,538 INFO L87 Difference]: Start difference. First operand 92 states and 99 transitions. Second operand 29 states. [2020-07-21 11:44:24,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:24,003 INFO L93 Difference]: Finished difference Result 179 states and 213 transitions. [2020-07-21 11:44:24,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 11:44:24,003 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 105 [2020-07-21 11:44:24,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:24,005 INFO L225 Difference]: With dead ends: 179 [2020-07-21 11:44:24,005 INFO L226 Difference]: Without dead ends: 130 [2020-07-21 11:44:24,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 173 SyntacticMatches, 9 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 11:44:24,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-07-21 11:44:24,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 94. [2020-07-21 11:44:24,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-21 11:44:24,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 101 transitions. [2020-07-21 11:44:24,015 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 101 transitions. Word has length 105 [2020-07-21 11:44:24,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:24,016 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 101 transitions. [2020-07-21 11:44:24,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 11:44:24,016 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 101 transitions. [2020-07-21 11:44:24,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-21 11:44:24,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:24,018 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:24,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:24,220 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:24,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:24,221 INFO L82 PathProgramCache]: Analyzing trace with hash -734782619, now seen corresponding path program 13 times [2020-07-21 11:44:24,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:24,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [618083861] [2020-07-21 11:44:24,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:24,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:24,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 11:44:24,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:24,543 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 11:44:24,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:24,849 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 11:44:24,850 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [618083861] [2020-07-21 11:44:24,850 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:24,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 32 [2020-07-21 11:44:24,851 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498925458] [2020-07-21 11:44:24,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 11:44:24,851 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:24,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 11:44:24,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2020-07-21 11:44:24,853 INFO L87 Difference]: Start difference. First operand 94 states and 101 transitions. Second operand 32 states. [2020-07-21 11:44:25,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:25,343 INFO L93 Difference]: Finished difference Result 183 states and 220 transitions. [2020-07-21 11:44:25,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 11:44:25,343 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 107 [2020-07-21 11:44:25,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:25,345 INFO L225 Difference]: With dead ends: 183 [2020-07-21 11:44:25,345 INFO L226 Difference]: Without dead ends: 136 [2020-07-21 11:44:25,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 173 SyntacticMatches, 10 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 396 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 11:44:25,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-21 11:44:25,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 96. [2020-07-21 11:44:25,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-21 11:44:25,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2020-07-21 11:44:25,356 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 107 [2020-07-21 11:44:25,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:25,356 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2020-07-21 11:44:25,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 11:44:25,357 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2020-07-21 11:44:25,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 11:44:25,358 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:25,358 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:25,573 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:25,573 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:25,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:25,574 INFO L82 PathProgramCache]: Analyzing trace with hash -336589110, now seen corresponding path program 14 times [2020-07-21 11:44:25,574 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:25,575 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [75859171] [2020-07-21 11:44:25,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:25,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:25,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 11:44:25,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:25,735 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:44:25,761 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 11:44:25,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:25,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:44:25,996 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 11:44:25,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [75859171] [2020-07-21 11:44:25,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:25,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-07-21 11:44:25,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136483457] [2020-07-21 11:44:25,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 11:44:25,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:25,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 11:44:25,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-07-21 11:44:25,999 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 16 states. [2020-07-21 11:44:26,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:26,172 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2020-07-21 11:44:26,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 11:44:26,172 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2020-07-21 11:44:26,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:26,174 INFO L225 Difference]: With dead ends: 115 [2020-07-21 11:44:26,175 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 11:44:26,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 183 SyntacticMatches, 20 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=99, Invalid=173, Unknown=0, NotChecked=0, Total=272 [2020-07-21 11:44:26,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 11:44:26,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 108. [2020-07-21 11:44:26,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-21 11:44:26,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 116 transitions. [2020-07-21 11:44:26,184 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 116 transitions. Word has length 109 [2020-07-21 11:44:26,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:26,185 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 116 transitions. [2020-07-21 11:44:26,185 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 11:44:26,185 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 116 transitions. [2020-07-21 11:44:26,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-21 11:44:26,187 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:26,188 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:26,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:26,403 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:26,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:26,404 INFO L82 PathProgramCache]: Analyzing trace with hash 1711037612, now seen corresponding path program 15 times [2020-07-21 11:44:26,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:26,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2002210737] [2020-07-21 11:44:26,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:26,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:26,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 11:44:26,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:26,800 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 300 proven. 110 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-21 11:44:26,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:27,181 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 262 proven. 110 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-21 11:44:27,181 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2002210737] [2020-07-21 11:44:27,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:27,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 35 [2020-07-21 11:44:27,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219759518] [2020-07-21 11:44:27,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 11:44:27,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:27,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 11:44:27,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=892, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 11:44:27,185 INFO L87 Difference]: Start difference. First operand 108 states and 116 transitions. Second operand 35 states. [2020-07-21 11:44:27,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:27,739 INFO L93 Difference]: Finished difference Result 211 states and 252 transitions. [2020-07-21 11:44:27,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 11:44:27,739 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 125 [2020-07-21 11:44:27,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:27,741 INFO L225 Difference]: With dead ends: 211 [2020-07-21 11:44:27,742 INFO L226 Difference]: Without dead ends: 154 [2020-07-21 11:44:27,743 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 [2020-07-21 11:44:27,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-21 11:44:27,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 110. [2020-07-21 11:44:27,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 11:44:27,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 118 transitions. [2020-07-21 11:44:27,764 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 118 transitions. Word has length 125 [2020-07-21 11:44:27,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:27,764 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 118 transitions. [2020-07-21 11:44:27,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 11:44:27,764 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 118 transitions. [2020-07-21 11:44:27,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-21 11:44:27,766 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:27,766 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:27,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:27,980 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:27,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:27,981 INFO L82 PathProgramCache]: Analyzing trace with hash 66724049, now seen corresponding path program 16 times [2020-07-21 11:44:27,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:27,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1020706288] [2020-07-21 11:44:27,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:28,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:28,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 11:44:28,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:28,438 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 11:44:28,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:28,908 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 11:44:28,908 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1020706288] [2020-07-21 11:44:28,908 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:28,908 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 38 [2020-07-21 11:44:28,909 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618661262] [2020-07-21 11:44:28,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 11:44:28,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:28,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 11:44:28,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 11:44:28,914 INFO L87 Difference]: Start difference. First operand 110 states and 118 transitions. Second operand 38 states. [2020-07-21 11:44:29,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:29,565 INFO L93 Difference]: Finished difference Result 215 states and 259 transitions. [2020-07-21 11:44:29,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 11:44:29,569 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 127 [2020-07-21 11:44:29,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:29,571 INFO L225 Difference]: With dead ends: 215 [2020-07-21 11:44:29,571 INFO L226 Difference]: Without dead ends: 160 [2020-07-21 11:44:29,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 205 SyntacticMatches, 12 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 583 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=673, Invalid=1777, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 11:44:29,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-07-21 11:44:29,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 112. [2020-07-21 11:44:29,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-21 11:44:29,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions. [2020-07-21 11:44:29,586 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 127 [2020-07-21 11:44:29,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:29,587 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 120 transitions. [2020-07-21 11:44:29,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 11:44:29,587 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions. [2020-07-21 11:44:29,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-07-21 11:44:29,588 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:29,588 INFO L422 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:29,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:29,797 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:29,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:29,798 INFO L82 PathProgramCache]: Analyzing trace with hash 429354934, now seen corresponding path program 17 times [2020-07-21 11:44:29,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:29,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [259190176] [2020-07-21 11:44:29,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:29,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:29,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 11:44:29,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:29,990 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:44:30,027 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 11:44:30,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:30,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:44:30,341 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 11:44:30,341 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [259190176] [2020-07-21 11:44:30,341 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:30,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-07-21 11:44:30,342 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552818422] [2020-07-21 11:44:30,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 11:44:30,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:30,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 11:44:30,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-07-21 11:44:30,344 INFO L87 Difference]: Start difference. First operand 112 states and 120 transitions. Second operand 18 states. [2020-07-21 11:44:30,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:30,571 INFO L93 Difference]: Finished difference Result 131 states and 141 transitions. [2020-07-21 11:44:30,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 11:44:30,574 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 129 [2020-07-21 11:44:30,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:30,578 INFO L225 Difference]: With dead ends: 131 [2020-07-21 11:44:30,579 INFO L226 Difference]: Without dead ends: 129 [2020-07-21 11:44:30,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 217 SyntacticMatches, 24 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=128, Invalid=214, Unknown=0, NotChecked=0, Total=342 [2020-07-21 11:44:30,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2020-07-21 11:44:30,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 124. [2020-07-21 11:44:30,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-21 11:44:30,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 133 transitions. [2020-07-21 11:44:30,599 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 133 transitions. Word has length 129 [2020-07-21 11:44:30,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:30,600 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 133 transitions. [2020-07-21 11:44:30,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 11:44:30,600 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 133 transitions. [2020-07-21 11:44:30,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-21 11:44:30,602 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:30,603 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:30,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:30,817 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:30,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:30,817 INFO L82 PathProgramCache]: Analyzing trace with hash 1971086744, now seen corresponding path program 18 times [2020-07-21 11:44:30,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:30,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [272183387] [2020-07-21 11:44:30,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:30,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:30,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 11:44:30,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:31,346 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 408 proven. 156 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-21 11:44:31,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:32,037 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 362 proven. 156 refuted. 0 times theorem prover too weak. 314 trivial. 0 not checked. [2020-07-21 11:44:32,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [272183387] [2020-07-21 11:44:32,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:32,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 41 [2020-07-21 11:44:32,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747928078] [2020-07-21 11:44:32,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-21 11:44:32,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:32,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-21 11:44:32,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 11:44:32,047 INFO L87 Difference]: Start difference. First operand 124 states and 133 transitions. Second operand 41 states. [2020-07-21 11:44:32,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:32,868 INFO L93 Difference]: Finished difference Result 243 states and 291 transitions. [2020-07-21 11:44:32,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 11:44:32,869 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 145 [2020-07-21 11:44:32,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:32,871 INFO L225 Difference]: With dead ends: 243 [2020-07-21 11:44:32,872 INFO L226 Difference]: Without dead ends: 178 [2020-07-21 11:44:32,874 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 237 SyntacticMatches, 13 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=781, Invalid=2081, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 11:44:32,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-21 11:44:32,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 126. [2020-07-21 11:44:32,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-07-21 11:44:32,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 135 transitions. [2020-07-21 11:44:32,891 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 135 transitions. Word has length 145 [2020-07-21 11:44:32,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:32,891 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 135 transitions. [2020-07-21 11:44:32,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-21 11:44:32,892 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 135 transitions. [2020-07-21 11:44:32,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2020-07-21 11:44:32,894 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:32,894 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:33,109 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:33,109 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:33,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:33,110 INFO L82 PathProgramCache]: Analyzing trace with hash 554411325, now seen corresponding path program 19 times [2020-07-21 11:44:33,110 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:33,110 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1081187828] [2020-07-21 11:44:33,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:33,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:33,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 11:44:33,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:33,678 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 11:44:33,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:34,216 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 11:44:34,216 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1081187828] [2020-07-21 11:44:34,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:34,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 44 [2020-07-21 11:44:34,217 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742310018] [2020-07-21 11:44:34,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 11:44:34,218 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:34,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 11:44:34,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 11:44:34,220 INFO L87 Difference]: Start difference. First operand 126 states and 135 transitions. Second operand 44 states. [2020-07-21 11:44:35,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:35,012 INFO L93 Difference]: Finished difference Result 247 states and 298 transitions. [2020-07-21 11:44:35,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 11:44:35,012 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 147 [2020-07-21 11:44:35,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:35,014 INFO L225 Difference]: With dead ends: 247 [2020-07-21 11:44:35,014 INFO L226 Difference]: Without dead ends: 184 [2020-07-21 11:44:35,016 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 237 SyntacticMatches, 14 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=897, Invalid=2409, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 11:44:35,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-07-21 11:44:35,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 128. [2020-07-21 11:44:35,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2020-07-21 11:44:35,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions. [2020-07-21 11:44:35,026 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 147 [2020-07-21 11:44:35,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:35,027 INFO L479 AbstractCegarLoop]: Abstraction has 128 states and 137 transitions. [2020-07-21 11:44:35,027 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 11:44:35,027 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions. [2020-07-21 11:44:35,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-21 11:44:35,029 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:35,029 INFO L422 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:35,243 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:35,244 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:35,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:35,244 INFO L82 PathProgramCache]: Analyzing trace with hash 633966498, now seen corresponding path program 20 times [2020-07-21 11:44:35,245 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:35,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2072912622] [2020-07-21 11:44:35,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:35,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:35,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-21 11:44:35,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:35,495 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:44:35,531 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 11:44:35,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:35,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:44:35,861 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 11:44:35,862 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2072912622] [2020-07-21 11:44:35,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:35,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-07-21 11:44:35,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377230960] [2020-07-21 11:44:35,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 11:44:35,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:35,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 11:44:35,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=223, Unknown=0, NotChecked=0, Total=380 [2020-07-21 11:44:35,864 INFO L87 Difference]: Start difference. First operand 128 states and 137 transitions. Second operand 20 states. [2020-07-21 11:44:36,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:36,107 INFO L93 Difference]: Finished difference Result 147 states and 158 transitions. [2020-07-21 11:44:36,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 11:44:36,108 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 149 [2020-07-21 11:44:36,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:36,110 INFO L225 Difference]: With dead ends: 147 [2020-07-21 11:44:36,110 INFO L226 Difference]: Without dead ends: 145 [2020-07-21 11:44:36,112 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 [2020-07-21 11:44:36,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2020-07-21 11:44:36,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 140. [2020-07-21 11:44:36,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-21 11:44:36,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 150 transitions. [2020-07-21 11:44:36,126 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 150 transitions. Word has length 149 [2020-07-21 11:44:36,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:36,127 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 150 transitions. [2020-07-21 11:44:36,127 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 11:44:36,127 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 150 transitions. [2020-07-21 11:44:36,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2020-07-21 11:44:36,129 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:36,129 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:36,345 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:36,346 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:36,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:36,347 INFO L82 PathProgramCache]: Analyzing trace with hash -869716604, now seen corresponding path program 21 times [2020-07-21 11:44:36,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:36,348 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [59003999] [2020-07-21 11:44:36,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:36,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:36,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-21 11:44:36,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:36,974 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 532 proven. 210 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 11:44:36,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:37,575 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 478 proven. 210 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 11:44:37,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [59003999] [2020-07-21 11:44:37,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:37,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 47 [2020-07-21 11:44:37,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585053414] [2020-07-21 11:44:37,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-21 11:44:37,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:37,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-21 11:44:37,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 11:44:37,579 INFO L87 Difference]: Start difference. First operand 140 states and 150 transitions. Second operand 47 states. [2020-07-21 11:44:38,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:38,492 INFO L93 Difference]: Finished difference Result 275 states and 330 transitions. [2020-07-21 11:44:38,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 11:44:38,492 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 165 [2020-07-21 11:44:38,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:38,497 INFO L225 Difference]: With dead ends: 275 [2020-07-21 11:44:38,498 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 11:44:38,501 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 269 SyntacticMatches, 15 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1021, Invalid=2761, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 11:44:38,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 11:44:38,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 142. [2020-07-21 11:44:38,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-21 11:44:38,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 152 transitions. [2020-07-21 11:44:38,515 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 152 transitions. Word has length 165 [2020-07-21 11:44:38,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:38,515 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 152 transitions. [2020-07-21 11:44:38,515 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-21 11:44:38,516 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 152 transitions. [2020-07-21 11:44:38,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2020-07-21 11:44:38,519 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:38,519 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:38,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:38,734 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:38,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:38,735 INFO L82 PathProgramCache]: Analyzing trace with hash -583456599, now seen corresponding path program 22 times [2020-07-21 11:44:38,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:38,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1045795867] [2020-07-21 11:44:38,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:38,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:38,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 34 conjunts are in the unsatisfiable core [2020-07-21 11:44:38,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:39,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 11:44:39,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:40,107 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 11:44:40,107 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1045795867] [2020-07-21 11:44:40,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:40,108 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 50 [2020-07-21 11:44:40,108 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016809644] [2020-07-21 11:44:40,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 11:44:40,109 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:40,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 11:44:40,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 11:44:40,110 INFO L87 Difference]: Start difference. First operand 142 states and 152 transitions. Second operand 50 states. [2020-07-21 11:44:41,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:41,256 INFO L93 Difference]: Finished difference Result 279 states and 337 transitions. [2020-07-21 11:44:41,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 11:44:41,257 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 167 [2020-07-21 11:44:41,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:41,260 INFO L225 Difference]: With dead ends: 279 [2020-07-21 11:44:41,260 INFO L226 Difference]: Without dead ends: 208 [2020-07-21 11:44:41,263 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 [2020-07-21 11:44:41,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-21 11:44:41,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 144. [2020-07-21 11:44:41,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 11:44:41,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 154 transitions. [2020-07-21 11:44:41,279 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 154 transitions. Word has length 167 [2020-07-21 11:44:41,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:41,279 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 154 transitions. [2020-07-21 11:44:41,280 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 11:44:41,280 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 154 transitions. [2020-07-21 11:44:41,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-07-21 11:44:41,282 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:41,282 INFO L422 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:41,497 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:41,498 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:41,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:41,499 INFO L82 PathProgramCache]: Analyzing trace with hash -365498738, now seen corresponding path program 23 times [2020-07-21 11:44:41,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:41,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [896421912] [2020-07-21 11:44:41,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:41,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:41,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 11:44:41,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:41,808 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:44:41,852 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 11:44:41,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:41,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:44:42,283 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 11:44:42,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [896421912] [2020-07-21 11:44:42,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:42,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-07-21 11:44:42,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713054446] [2020-07-21 11:44:42,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 11:44:42,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:42,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 11:44:42,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=268, Unknown=0, NotChecked=0, Total=462 [2020-07-21 11:44:42,286 INFO L87 Difference]: Start difference. First operand 144 states and 154 transitions. Second operand 22 states. [2020-07-21 11:44:42,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:42,560 INFO L93 Difference]: Finished difference Result 163 states and 175 transitions. [2020-07-21 11:44:42,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 11:44:42,561 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 169 [2020-07-21 11:44:42,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:42,563 INFO L225 Difference]: With dead ends: 163 [2020-07-21 11:44:42,564 INFO L226 Difference]: Without dead ends: 161 [2020-07-21 11:44:42,565 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 285 SyntacticMatches, 32 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=198, Invalid=308, Unknown=0, NotChecked=0, Total=506 [2020-07-21 11:44:42,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2020-07-21 11:44:42,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 156. [2020-07-21 11:44:42,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-21 11:44:42,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 167 transitions. [2020-07-21 11:44:42,596 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 167 transitions. Word has length 169 [2020-07-21 11:44:42,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:42,597 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 167 transitions. [2020-07-21 11:44:42,597 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 11:44:42,598 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 167 transitions. [2020-07-21 11:44:42,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2020-07-21 11:44:42,599 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:42,600 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:42,814 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:42,815 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:42,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:42,816 INFO L82 PathProgramCache]: Analyzing trace with hash -760007568, now seen corresponding path program 24 times [2020-07-21 11:44:42,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:42,816 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [782391604] [2020-07-21 11:44:42,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:42,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:42,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 11:44:42,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:43,741 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 672 proven. 272 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-07-21 11:44:43,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:44,609 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 610 proven. 272 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2020-07-21 11:44:44,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [782391604] [2020-07-21 11:44:44,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:44,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 53 [2020-07-21 11:44:44,611 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341907553] [2020-07-21 11:44:44,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-21 11:44:44,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:44,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-21 11:44:44,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 11:44:44,612 INFO L87 Difference]: Start difference. First operand 156 states and 167 transitions. Second operand 53 states. [2020-07-21 11:44:45,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:45,803 INFO L93 Difference]: Finished difference Result 307 states and 369 transitions. [2020-07-21 11:44:45,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 11:44:45,804 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 185 [2020-07-21 11:44:45,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:45,806 INFO L225 Difference]: With dead ends: 307 [2020-07-21 11:44:45,806 INFO L226 Difference]: Without dead ends: 226 [2020-07-21 11:44:45,808 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 301 SyntacticMatches, 17 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1208 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1293, Invalid=3537, Unknown=0, NotChecked=0, Total=4830 [2020-07-21 11:44:45,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-21 11:44:45,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 158. [2020-07-21 11:44:45,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-07-21 11:44:45,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 169 transitions. [2020-07-21 11:44:45,821 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 169 transitions. Word has length 185 [2020-07-21 11:44:45,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:45,822 INFO L479 AbstractCegarLoop]: Abstraction has 158 states and 169 transitions. [2020-07-21 11:44:45,822 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-21 11:44:45,822 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 169 transitions. [2020-07-21 11:44:45,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-21 11:44:45,824 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:45,824 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:46,038 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:46,039 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:46,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:46,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1861014763, now seen corresponding path program 25 times [2020-07-21 11:44:46,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:46,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [464708153] [2020-07-21 11:44:46,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:46,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:46,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 38 conjunts are in the unsatisfiable core [2020-07-21 11:44:46,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:46,872 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 11:44:46,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:47,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 11:44:47,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [464708153] [2020-07-21 11:44:47,755 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:47,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 56 [2020-07-21 11:44:47,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135048710] [2020-07-21 11:44:47,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-21 11:44:47,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:47,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-21 11:44:47,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=2341, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 11:44:47,759 INFO L87 Difference]: Start difference. First operand 158 states and 169 transitions. Second operand 56 states. [2020-07-21 11:44:48,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:48,998 INFO L93 Difference]: Finished difference Result 311 states and 376 transitions. [2020-07-21 11:44:48,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 11:44:48,998 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 187 [2020-07-21 11:44:48,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:49,000 INFO L225 Difference]: With dead ends: 311 [2020-07-21 11:44:49,001 INFO L226 Difference]: Without dead ends: 232 [2020-07-21 11:44:49,004 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 301 SyntacticMatches, 18 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1360 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1441, Invalid=3961, Unknown=0, NotChecked=0, Total=5402 [2020-07-21 11:44:49,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-07-21 11:44:49,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 160. [2020-07-21 11:44:49,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-21 11:44:49,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 171 transitions. [2020-07-21 11:44:49,016 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 171 transitions. Word has length 187 [2020-07-21 11:44:49,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:49,016 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 171 transitions. [2020-07-21 11:44:49,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-21 11:44:49,017 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 171 transitions. [2020-07-21 11:44:49,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 11:44:49,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:49,019 INFO L422 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:49,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:49,233 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:49,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:49,233 INFO L82 PathProgramCache]: Analyzing trace with hash 927992954, now seen corresponding path program 26 times [2020-07-21 11:44:49,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:49,234 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1648320988] [2020-07-21 11:44:49,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:49,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:49,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-21 11:44:49,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:49,590 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:44:49,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 11:44:49,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:49,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:44:50,406 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 11:44:50,407 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1648320988] [2020-07-21 11:44:50,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:50,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-07-21 11:44:50,408 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3713160] [2020-07-21 11:44:50,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 11:44:50,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:50,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 11:44:50,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=317, Unknown=0, NotChecked=0, Total=552 [2020-07-21 11:44:50,415 INFO L87 Difference]: Start difference. First operand 160 states and 171 transitions. Second operand 24 states. [2020-07-21 11:44:50,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:50,722 INFO L93 Difference]: Finished difference Result 179 states and 192 transitions. [2020-07-21 11:44:50,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 11:44:50,723 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 189 [2020-07-21 11:44:50,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:50,726 INFO L225 Difference]: With dead ends: 179 [2020-07-21 11:44:50,727 INFO L226 Difference]: Without dead ends: 177 [2020-07-21 11:44:50,729 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 319 SyntacticMatches, 36 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=239, Invalid=361, Unknown=0, NotChecked=0, Total=600 [2020-07-21 11:44:50,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2020-07-21 11:44:50,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 172. [2020-07-21 11:44:50,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2020-07-21 11:44:50,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 184 transitions. [2020-07-21 11:44:50,749 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 184 transitions. Word has length 189 [2020-07-21 11:44:50,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:50,751 INFO L479 AbstractCegarLoop]: Abstraction has 172 states and 184 transitions. [2020-07-21 11:44:50,751 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 11:44:50,751 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 184 transitions. [2020-07-21 11:44:50,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-21 11:44:50,753 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:50,753 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 19, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:50,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:50,969 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:50,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:50,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1753938524, now seen corresponding path program 27 times [2020-07-21 11:44:50,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:50,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1459139713] [2020-07-21 11:44:50,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:51,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:51,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 40 conjunts are in the unsatisfiable core [2020-07-21 11:44:51,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:51,915 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 828 proven. 342 refuted. 0 times theorem prover too weak. 616 trivial. 0 not checked. [2020-07-21 11:44:51,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:52,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 758 proven. 342 refuted. 0 times theorem prover too weak. 686 trivial. 0 not checked. [2020-07-21 11:44:52,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1459139713] [2020-07-21 11:44:52,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:52,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 59 [2020-07-21 11:44:52,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806586314] [2020-07-21 11:44:52,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-21 11:44:52,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:52,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-21 11:44:52,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2020-07-21 11:44:52,906 INFO L87 Difference]: Start difference. First operand 172 states and 184 transitions. Second operand 59 states. [2020-07-21 11:44:54,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:54,196 INFO L93 Difference]: Finished difference Result 339 states and 408 transitions. [2020-07-21 11:44:54,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 11:44:54,196 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 205 [2020-07-21 11:44:54,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:54,198 INFO L225 Difference]: With dead ends: 339 [2020-07-21 11:44:54,198 INFO L226 Difference]: Without dead ends: 250 [2020-07-21 11:44:54,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 333 SyntacticMatches, 19 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1521 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1597, Invalid=4409, Unknown=0, NotChecked=0, Total=6006 [2020-07-21 11:44:54,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-21 11:44:54,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 174. [2020-07-21 11:44:54,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-21 11:44:54,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 186 transitions. [2020-07-21 11:44:54,212 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 186 transitions. Word has length 205 [2020-07-21 11:44:54,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:54,212 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 186 transitions. [2020-07-21 11:44:54,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-21 11:44:54,213 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 186 transitions. [2020-07-21 11:44:54,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2020-07-21 11:44:54,214 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:54,214 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:54,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:54,429 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:54,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:54,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1542073473, now seen corresponding path program 28 times [2020-07-21 11:44:54,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:54,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [904975453] [2020-07-21 11:44:54,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:54,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:54,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 42 conjunts are in the unsatisfiable core [2020-07-21 11:44:54,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:55,554 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 11:44:55,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:56,766 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 11:44:56,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [904975453] [2020-07-21 11:44:56,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:56,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 62 [2020-07-21 11:44:56,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603113861] [2020-07-21 11:44:56,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-07-21 11:44:56,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:56,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-07-21 11:44:56,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=2881, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 11:44:56,772 INFO L87 Difference]: Start difference. First operand 174 states and 186 transitions. Second operand 62 states. [2020-07-21 11:44:58,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:44:58,288 INFO L93 Difference]: Finished difference Result 343 states and 415 transitions. [2020-07-21 11:44:58,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 11:44:58,289 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 207 [2020-07-21 11:44:58,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:44:58,291 INFO L225 Difference]: With dead ends: 343 [2020-07-21 11:44:58,291 INFO L226 Difference]: Without dead ends: 256 [2020-07-21 11:44:58,293 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 333 SyntacticMatches, 20 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1691 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1761, Invalid=4881, Unknown=0, NotChecked=0, Total=6642 [2020-07-21 11:44:58,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-07-21 11:44:58,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 176. [2020-07-21 11:44:58,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 11:44:58,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 188 transitions. [2020-07-21 11:44:58,305 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 188 transitions. Word has length 207 [2020-07-21 11:44:58,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:44:58,306 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 188 transitions. [2020-07-21 11:44:58,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-07-21 11:44:58,306 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 188 transitions. [2020-07-21 11:44:58,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2020-07-21 11:44:58,308 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:44:58,308 INFO L422 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:44:58,523 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:58,524 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:44:58,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:44:58,525 INFO L82 PathProgramCache]: Analyzing trace with hash -196777626, now seen corresponding path program 29 times [2020-07-21 11:44:58,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:44:58,526 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [333387820] [2020-07-21 11:44:58,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:44:58,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:44:58,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-21 11:44:58,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:44:58,971 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:44:59,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 11:44:59,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:44:59,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:44:59,720 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 11:44:59,720 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [333387820] [2020-07-21 11:44:59,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:44:59,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-07-21 11:44:59,721 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455487767] [2020-07-21 11:44:59,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 11:44:59,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:44:59,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 11:44:59,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=370, Unknown=0, NotChecked=0, Total=650 [2020-07-21 11:44:59,722 INFO L87 Difference]: Start difference. First operand 176 states and 188 transitions. Second operand 26 states. [2020-07-21 11:45:00,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:00,059 INFO L93 Difference]: Finished difference Result 195 states and 209 transitions. [2020-07-21 11:45:00,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 11:45:00,060 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 209 [2020-07-21 11:45:00,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:00,063 INFO L225 Difference]: With dead ends: 195 [2020-07-21 11:45:00,063 INFO L226 Difference]: Without dead ends: 193 [2020-07-21 11:45:00,064 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 353 SyntacticMatches, 40 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=284, Invalid=418, Unknown=0, NotChecked=0, Total=702 [2020-07-21 11:45:00,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2020-07-21 11:45:00,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 188. [2020-07-21 11:45:00,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-21 11:45:00,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 201 transitions. [2020-07-21 11:45:00,077 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 201 transitions. Word has length 209 [2020-07-21 11:45:00,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:00,078 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 201 transitions. [2020-07-21 11:45:00,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 11:45:00,078 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 201 transitions. [2020-07-21 11:45:00,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-07-21 11:45:00,080 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:00,080 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 21, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:00,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:00,295 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:00,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:00,296 INFO L82 PathProgramCache]: Analyzing trace with hash 65077064, now seen corresponding path program 30 times [2020-07-21 11:45:00,296 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:00,296 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [107883090] [2020-07-21 11:45:00,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:00,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:00,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 44 conjunts are in the unsatisfiable core [2020-07-21 11:45:00,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:01,467 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 1000 proven. 420 refuted. 0 times theorem prover too weak. 764 trivial. 0 not checked. [2020-07-21 11:45:01,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:02,686 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 922 proven. 420 refuted. 0 times theorem prover too weak. 842 trivial. 0 not checked. [2020-07-21 11:45:02,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [107883090] [2020-07-21 11:45:02,686 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:02,686 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44] total 65 [2020-07-21 11:45:02,686 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227279300] [2020-07-21 11:45:02,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-07-21 11:45:02,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:02,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-07-21 11:45:02,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2020-07-21 11:45:02,695 INFO L87 Difference]: Start difference. First operand 188 states and 201 transitions. Second operand 65 states. [2020-07-21 11:45:04,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:04,288 INFO L93 Difference]: Finished difference Result 371 states and 447 transitions. [2020-07-21 11:45:04,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 11:45:04,289 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 225 [2020-07-21 11:45:04,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:04,291 INFO L225 Difference]: With dead ends: 371 [2020-07-21 11:45:04,292 INFO L226 Difference]: Without dead ends: 274 [2020-07-21 11:45:04,293 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 365 SyntacticMatches, 21 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1870 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1933, Invalid=5377, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 11:45:04,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-21 11:45:04,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 190. [2020-07-21 11:45:04,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 11:45:04,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 203 transitions. [2020-07-21 11:45:04,306 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 203 transitions. Word has length 225 [2020-07-21 11:45:04,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:04,306 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 203 transitions. [2020-07-21 11:45:04,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-07-21 11:45:04,306 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 203 transitions. [2020-07-21 11:45:04,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2020-07-21 11:45:04,308 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:04,309 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:04,521 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:04,522 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:04,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:04,522 INFO L82 PathProgramCache]: Analyzing trace with hash 1137618157, now seen corresponding path program 31 times [2020-07-21 11:45:04,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:04,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2080387871] [2020-07-21 11:45:04,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:04,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:04,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 46 conjunts are in the unsatisfiable core [2020-07-21 11:45:04,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:05,779 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 11:45:05,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:07,162 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 11:45:07,163 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2080387871] [2020-07-21 11:45:07,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:07,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46] total 68 [2020-07-21 11:45:07,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932674576] [2020-07-21 11:45:07,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-21 11:45:07,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:07,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-21 11:45:07,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1079, Invalid=3477, Unknown=0, NotChecked=0, Total=4556 [2020-07-21 11:45:07,168 INFO L87 Difference]: Start difference. First operand 190 states and 203 transitions. Second operand 68 states. [2020-07-21 11:45:08,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:08,919 INFO L93 Difference]: Finished difference Result 375 states and 454 transitions. [2020-07-21 11:45:08,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-21 11:45:08,919 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 227 [2020-07-21 11:45:08,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:08,921 INFO L225 Difference]: With dead ends: 375 [2020-07-21 11:45:08,921 INFO L226 Difference]: Without dead ends: 280 [2020-07-21 11:45:08,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 365 SyntacticMatches, 22 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2058 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=2113, Invalid=5897, Unknown=0, NotChecked=0, Total=8010 [2020-07-21 11:45:08,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-07-21 11:45:08,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 192. [2020-07-21 11:45:08,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-21 11:45:08,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 205 transitions. [2020-07-21 11:45:08,937 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 205 transitions. Word has length 227 [2020-07-21 11:45:08,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:08,937 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 205 transitions. [2020-07-21 11:45:08,937 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-21 11:45:08,937 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 205 transitions. [2020-07-21 11:45:08,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2020-07-21 11:45:08,939 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:08,940 INFO L422 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:09,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:09,149 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:09,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:09,150 INFO L82 PathProgramCache]: Analyzing trace with hash 1057457490, now seen corresponding path program 32 times [2020-07-21 11:45:09,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:09,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [115138598] [2020-07-21 11:45:09,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:09,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:09,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-21 11:45:09,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:09,658 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:45:09,738 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 11:45:09,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:09,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:45:10,543 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 11:45:10,544 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [115138598] [2020-07-21 11:45:10,544 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:10,544 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2020-07-21 11:45:10,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264183342] [2020-07-21 11:45:10,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 11:45:10,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:10,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 11:45:10,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=427, Unknown=0, NotChecked=0, Total=756 [2020-07-21 11:45:10,547 INFO L87 Difference]: Start difference. First operand 192 states and 205 transitions. Second operand 28 states. [2020-07-21 11:45:10,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:10,884 INFO L93 Difference]: Finished difference Result 211 states and 226 transitions. [2020-07-21 11:45:10,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 11:45:10,885 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 229 [2020-07-21 11:45:10,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:10,887 INFO L225 Difference]: With dead ends: 211 [2020-07-21 11:45:10,887 INFO L226 Difference]: Without dead ends: 209 [2020-07-21 11:45:10,888 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 387 SyntacticMatches, 44 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=333, Invalid=479, Unknown=0, NotChecked=0, Total=812 [2020-07-21 11:45:10,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-21 11:45:10,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 204. [2020-07-21 11:45:10,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-21 11:45:10,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 218 transitions. [2020-07-21 11:45:10,900 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 218 transitions. Word has length 229 [2020-07-21 11:45:10,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:10,901 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 218 transitions. [2020-07-21 11:45:10,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 11:45:10,901 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 218 transitions. [2020-07-21 11:45:10,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2020-07-21 11:45:10,903 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:10,903 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 23, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:11,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:11,117 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:11,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:11,118 INFO L82 PathProgramCache]: Analyzing trace with hash -777665740, now seen corresponding path program 33 times [2020-07-21 11:45:11,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:11,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1143552870] [2020-07-21 11:45:11,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:11,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:11,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 654 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-21 11:45:11,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:12,542 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1188 proven. 506 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2020-07-21 11:45:12,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:14,007 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1102 proven. 506 refuted. 0 times theorem prover too weak. 1014 trivial. 0 not checked. [2020-07-21 11:45:14,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1143552870] [2020-07-21 11:45:14,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:14,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48] total 71 [2020-07-21 11:45:14,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70400586] [2020-07-21 11:45:14,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-07-21 11:45:14,009 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:14,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-07-21 11:45:14,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2020-07-21 11:45:14,011 INFO L87 Difference]: Start difference. First operand 204 states and 218 transitions. Second operand 71 states. [2020-07-21 11:45:15,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:15,823 INFO L93 Difference]: Finished difference Result 403 states and 486 transitions. [2020-07-21 11:45:15,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 11:45:15,823 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 245 [2020-07-21 11:45:15,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:15,824 INFO L225 Difference]: With dead ends: 403 [2020-07-21 11:45:15,825 INFO L226 Difference]: Without dead ends: 298 [2020-07-21 11:45:15,826 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 397 SyntacticMatches, 23 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2255 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2301, Invalid=6441, Unknown=0, NotChecked=0, Total=8742 [2020-07-21 11:45:15,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2020-07-21 11:45:15,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 206. [2020-07-21 11:45:15,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-21 11:45:15,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 220 transitions. [2020-07-21 11:45:15,837 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 220 transitions. Word has length 245 [2020-07-21 11:45:15,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:15,837 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 220 transitions. [2020-07-21 11:45:15,837 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-07-21 11:45:15,837 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 220 transitions. [2020-07-21 11:45:15,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2020-07-21 11:45:15,839 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:15,839 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:16,053 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:16,054 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:16,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:16,054 INFO L82 PathProgramCache]: Analyzing trace with hash 1435577433, now seen corresponding path program 34 times [2020-07-21 11:45:16,055 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:16,055 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [34858151] [2020-07-21 11:45:16,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:16,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:16,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 50 conjunts are in the unsatisfiable core [2020-07-21 11:45:16,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:17,552 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 11:45:17,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:19,174 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 11:45:19,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [34858151] [2020-07-21 11:45:19,175 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:19,175 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50] total 74 [2020-07-21 11:45:19,175 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947140827] [2020-07-21 11:45:19,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2020-07-21 11:45:19,176 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:19,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2020-07-21 11:45:19,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2020-07-21 11:45:19,178 INFO L87 Difference]: Start difference. First operand 206 states and 220 transitions. Second operand 74 states. [2020-07-21 11:45:21,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:21,272 INFO L93 Difference]: Finished difference Result 407 states and 493 transitions. [2020-07-21 11:45:21,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 11:45:21,272 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 247 [2020-07-21 11:45:21,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:21,274 INFO L225 Difference]: With dead ends: 407 [2020-07-21 11:45:21,274 INFO L226 Difference]: Without dead ends: 304 [2020-07-21 11:45:21,276 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 397 SyntacticMatches, 24 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2461 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2497, Invalid=7009, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 11:45:21,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2020-07-21 11:45:21,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 208. [2020-07-21 11:45:21,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-21 11:45:21,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 222 transitions. [2020-07-21 11:45:21,289 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 222 transitions. Word has length 247 [2020-07-21 11:45:21,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:21,290 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 222 transitions. [2020-07-21 11:45:21,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 74 states. [2020-07-21 11:45:21,290 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 222 transitions. [2020-07-21 11:45:21,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-21 11:45:21,292 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:21,292 INFO L422 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:21,506 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:21,507 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:21,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:21,508 INFO L82 PathProgramCache]: Analyzing trace with hash -1941512130, now seen corresponding path program 35 times [2020-07-21 11:45:21,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:21,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [608802500] [2020-07-21 11:45:21,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:21,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:21,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-21 11:45:21,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:22,118 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:45:22,189 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 11:45:22,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:22,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:45:23,151 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 11:45:23,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [608802500] [2020-07-21 11:45:23,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:23,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2020-07-21 11:45:23,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584025298] [2020-07-21 11:45:23,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 11:45:23,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:23,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 11:45:23,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=488, Unknown=0, NotChecked=0, Total=870 [2020-07-21 11:45:23,153 INFO L87 Difference]: Start difference. First operand 208 states and 222 transitions. Second operand 30 states. [2020-07-21 11:45:23,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:23,535 INFO L93 Difference]: Finished difference Result 227 states and 243 transitions. [2020-07-21 11:45:23,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 11:45:23,536 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 249 [2020-07-21 11:45:23,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:23,538 INFO L225 Difference]: With dead ends: 227 [2020-07-21 11:45:23,539 INFO L226 Difference]: Without dead ends: 225 [2020-07-21 11:45:23,539 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 421 SyntacticMatches, 48 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 743 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=386, Invalid=544, Unknown=0, NotChecked=0, Total=930 [2020-07-21 11:45:23,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-21 11:45:23,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 220. [2020-07-21 11:45:23,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2020-07-21 11:45:23,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 235 transitions. [2020-07-21 11:45:23,552 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 235 transitions. Word has length 249 [2020-07-21 11:45:23,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:23,552 INFO L479 AbstractCegarLoop]: Abstraction has 220 states and 235 transitions. [2020-07-21 11:45:23,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 11:45:23,553 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 235 transitions. [2020-07-21 11:45:23,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2020-07-21 11:45:23,555 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:23,555 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 25, 25, 25, 25, 25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:23,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:23,764 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:23,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:23,765 INFO L82 PathProgramCache]: Analyzing trace with hash -712391136, now seen corresponding path program 36 times [2020-07-21 11:45:23,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:23,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1766990461] [2020-07-21 11:45:23,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:23,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:23,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 708 conjuncts, 52 conjunts are in the unsatisfiable core [2020-07-21 11:45:23,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:25,439 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1392 proven. 600 refuted. 0 times theorem prover too weak. 1108 trivial. 0 not checked. [2020-07-21 11:45:25,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:27,231 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1298 proven. 600 refuted. 0 times theorem prover too weak. 1202 trivial. 0 not checked. [2020-07-21 11:45:27,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1766990461] [2020-07-21 11:45:27,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:27,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52] total 77 [2020-07-21 11:45:27,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772823638] [2020-07-21 11:45:27,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-07-21 11:45:27,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:27,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-07-21 11:45:27,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2020-07-21 11:45:27,235 INFO L87 Difference]: Start difference. First operand 220 states and 235 transitions. Second operand 77 states. [2020-07-21 11:45:29,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:29,476 INFO L93 Difference]: Finished difference Result 435 states and 525 transitions. [2020-07-21 11:45:29,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-21 11:45:29,476 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 265 [2020-07-21 11:45:29,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:29,478 INFO L225 Difference]: With dead ends: 435 [2020-07-21 11:45:29,478 INFO L226 Difference]: Without dead ends: 322 [2020-07-21 11:45:29,480 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 554 GetRequests, 429 SyntacticMatches, 25 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2676 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=2701, Invalid=7601, Unknown=0, NotChecked=0, Total=10302 [2020-07-21 11:45:29,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-21 11:45:29,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 222. [2020-07-21 11:45:29,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-21 11:45:29,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 237 transitions. [2020-07-21 11:45:29,494 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 237 transitions. Word has length 265 [2020-07-21 11:45:29,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:29,494 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 237 transitions. [2020-07-21 11:45:29,495 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-07-21 11:45:29,495 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 237 transitions. [2020-07-21 11:45:29,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2020-07-21 11:45:29,497 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:29,497 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:29,710 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:29,711 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:29,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:29,712 INFO L82 PathProgramCache]: Analyzing trace with hash -993908027, now seen corresponding path program 37 times [2020-07-21 11:45:29,712 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:29,713 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1613797091] [2020-07-21 11:45:29,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:29,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:29,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 54 conjunts are in the unsatisfiable core [2020-07-21 11:45:29,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:31,540 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 11:45:31,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:33,526 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 11:45:33,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1613797091] [2020-07-21 11:45:33,527 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:33,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54] total 80 [2020-07-21 11:45:33,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641110327] [2020-07-21 11:45:33,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2020-07-21 11:45:33,528 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:33,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2020-07-21 11:45:33,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2020-07-21 11:45:33,529 INFO L87 Difference]: Start difference. First operand 222 states and 237 transitions. Second operand 80 states. [2020-07-21 11:45:35,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:35,956 INFO L93 Difference]: Finished difference Result 439 states and 532 transitions. [2020-07-21 11:45:35,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 11:45:35,956 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 267 [2020-07-21 11:45:35,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:35,959 INFO L225 Difference]: With dead ends: 439 [2020-07-21 11:45:35,959 INFO L226 Difference]: Without dead ends: 328 [2020-07-21 11:45:35,961 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 429 SyntacticMatches, 26 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2900 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=2913, Invalid=8217, Unknown=0, NotChecked=0, Total=11130 [2020-07-21 11:45:35,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2020-07-21 11:45:35,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 224. [2020-07-21 11:45:35,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-21 11:45:35,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 239 transitions. [2020-07-21 11:45:35,975 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 239 transitions. Word has length 267 [2020-07-21 11:45:35,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:35,975 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 239 transitions. [2020-07-21 11:45:35,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 80 states. [2020-07-21 11:45:35,976 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 239 transitions. [2020-07-21 11:45:35,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-07-21 11:45:35,978 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:35,978 INFO L422 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:36,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:36,192 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:36,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:36,193 INFO L82 PathProgramCache]: Analyzing trace with hash -948700630, now seen corresponding path program 38 times [2020-07-21 11:45:36,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:36,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [261059312] [2020-07-21 11:45:36,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:36,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:36,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 55 conjunts are in the unsatisfiable core [2020-07-21 11:45:36,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:36,959 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:45:37,043 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 11:45:37,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:37,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:45:38,212 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 11:45:38,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [261059312] [2020-07-21 11:45:38,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:38,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2020-07-21 11:45:38,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21445873] [2020-07-21 11:45:38,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 11:45:38,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:38,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 11:45:38,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=553, Unknown=0, NotChecked=0, Total=992 [2020-07-21 11:45:38,215 INFO L87 Difference]: Start difference. First operand 224 states and 239 transitions. Second operand 32 states. [2020-07-21 11:45:38,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:38,691 INFO L93 Difference]: Finished difference Result 243 states and 260 transitions. [2020-07-21 11:45:38,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 11:45:38,697 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 269 [2020-07-21 11:45:38,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:38,700 INFO L225 Difference]: With dead ends: 243 [2020-07-21 11:45:38,700 INFO L226 Difference]: Without dead ends: 241 [2020-07-21 11:45:38,701 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 455 SyntacticMatches, 52 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=443, Invalid=613, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 11:45:38,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2020-07-21 11:45:38,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 236. [2020-07-21 11:45:38,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-21 11:45:38,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 252 transitions. [2020-07-21 11:45:38,715 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 252 transitions. Word has length 269 [2020-07-21 11:45:38,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:38,716 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 252 transitions. [2020-07-21 11:45:38,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 11:45:38,716 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 252 transitions. [2020-07-21 11:45:38,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2020-07-21 11:45:38,718 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:38,719 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:38,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:38,934 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:38,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:38,934 INFO L82 PathProgramCache]: Analyzing trace with hash 167610380, now seen corresponding path program 39 times [2020-07-21 11:45:38,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:38,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [328403151] [2020-07-21 11:45:38,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:39,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:39,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 762 conjuncts, 56 conjunts are in the unsatisfiable core [2020-07-21 11:45:39,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:41,002 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1612 proven. 702 refuted. 0 times theorem prover too weak. 1304 trivial. 0 not checked. [2020-07-21 11:45:41,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:43,432 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1510 proven. 702 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2020-07-21 11:45:43,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [328403151] [2020-07-21 11:45:43,432 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:43,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56] total 83 [2020-07-21 11:45:43,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666172262] [2020-07-21 11:45:43,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-07-21 11:45:43,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:43,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-07-21 11:45:43,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1594, Invalid=5212, Unknown=0, NotChecked=0, Total=6806 [2020-07-21 11:45:43,436 INFO L87 Difference]: Start difference. First operand 236 states and 252 transitions. Second operand 83 states. [2020-07-21 11:45:46,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:46,200 INFO L93 Difference]: Finished difference Result 467 states and 564 transitions. [2020-07-21 11:45:46,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-21 11:45:46,200 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 285 [2020-07-21 11:45:46,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:46,202 INFO L225 Difference]: With dead ends: 467 [2020-07-21 11:45:46,202 INFO L226 Difference]: Without dead ends: 346 [2020-07-21 11:45:46,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 596 GetRequests, 461 SyntacticMatches, 27 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3133 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=3133, Invalid=8857, Unknown=0, NotChecked=0, Total=11990 [2020-07-21 11:45:46,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2020-07-21 11:45:46,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 238. [2020-07-21 11:45:46,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-21 11:45:46,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 254 transitions. [2020-07-21 11:45:46,220 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 254 transitions. Word has length 285 [2020-07-21 11:45:46,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:46,221 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 254 transitions. [2020-07-21 11:45:46,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-07-21 11:45:46,221 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 254 transitions. [2020-07-21 11:45:46,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-07-21 11:45:46,223 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:46,223 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:46,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:46,439 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:46,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:46,440 INFO L82 PathProgramCache]: Analyzing trace with hash 196225073, now seen corresponding path program 40 times [2020-07-21 11:45:46,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:46,440 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [796322368] [2020-07-21 11:45:46,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:46,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:46,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 772 conjuncts, 58 conjunts are in the unsatisfiable core [2020-07-21 11:45:46,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:48,662 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 11:45:48,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:51,177 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 11:45:51,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [796322368] [2020-07-21 11:45:51,178 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:51,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58] total 86 [2020-07-21 11:45:51,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468614862] [2020-07-21 11:45:51,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2020-07-21 11:45:51,180 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:51,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2020-07-21 11:45:51,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 11:45:51,181 INFO L87 Difference]: Start difference. First operand 238 states and 254 transitions. Second operand 86 states. [2020-07-21 11:45:54,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:54,089 INFO L93 Difference]: Finished difference Result 471 states and 571 transitions. [2020-07-21 11:45:54,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-21 11:45:54,090 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 287 [2020-07-21 11:45:54,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:54,092 INFO L225 Difference]: With dead ends: 471 [2020-07-21 11:45:54,092 INFO L226 Difference]: Without dead ends: 352 [2020-07-21 11:45:54,095 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 461 SyntacticMatches, 28 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3375 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=3361, Invalid=9521, Unknown=0, NotChecked=0, Total=12882 [2020-07-21 11:45:54,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2020-07-21 11:45:54,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 240. [2020-07-21 11:45:54,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-21 11:45:54,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 256 transitions. [2020-07-21 11:45:54,111 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 256 transitions. Word has length 287 [2020-07-21 11:45:54,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:54,112 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 256 transitions. [2020-07-21 11:45:54,112 INFO L480 AbstractCegarLoop]: Interpolant automaton has 86 states. [2020-07-21 11:45:54,112 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 256 transitions. [2020-07-21 11:45:54,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2020-07-21 11:45:54,114 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:54,115 INFO L422 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:54,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:54,329 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:54,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:54,329 INFO L82 PathProgramCache]: Analyzing trace with hash 1925141270, now seen corresponding path program 41 times [2020-07-21 11:45:54,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:54,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [855566684] [2020-07-21 11:45:54,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:54,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:54,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 782 conjuncts, 59 conjunts are in the unsatisfiable core [2020-07-21 11:45:54,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:45:55,354 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:45:55,470 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 11:45:55,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:45:55,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:45:57,191 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 11:45:57,192 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [855566684] [2020-07-21 11:45:57,192 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:45:57,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2020-07-21 11:45:57,193 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30035687] [2020-07-21 11:45:57,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 11:45:57,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:45:57,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 11:45:57,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=500, Invalid=622, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 11:45:57,194 INFO L87 Difference]: Start difference. First operand 240 states and 256 transitions. Second operand 34 states. [2020-07-21 11:45:57,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:45:57,720 INFO L93 Difference]: Finished difference Result 259 states and 277 transitions. [2020-07-21 11:45:57,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 11:45:57,722 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 289 [2020-07-21 11:45:57,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:45:57,724 INFO L225 Difference]: With dead ends: 259 [2020-07-21 11:45:57,724 INFO L226 Difference]: Without dead ends: 257 [2020-07-21 11:45:57,725 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 489 SyntacticMatches, 56 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=504, Invalid=686, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 11:45:57,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-21 11:45:57,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 252. [2020-07-21 11:45:57,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 252 states. [2020-07-21 11:45:57,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 269 transitions. [2020-07-21 11:45:57,739 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 269 transitions. Word has length 289 [2020-07-21 11:45:57,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:45:57,740 INFO L479 AbstractCegarLoop]: Abstraction has 252 states and 269 transitions. [2020-07-21 11:45:57,740 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 11:45:57,740 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 269 transitions. [2020-07-21 11:45:57,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2020-07-21 11:45:57,743 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:45:57,743 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 29, 29, 29, 29, 29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:45:57,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:57,957 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:45:57,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:45:57,957 INFO L82 PathProgramCache]: Analyzing trace with hash -2144237320, now seen corresponding path program 42 times [2020-07-21 11:45:57,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:45:57,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [982972021] [2020-07-21 11:45:57,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:45:58,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:45:58,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 816 conjuncts, 60 conjunts are in the unsatisfiable core [2020-07-21 11:45:58,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:00,494 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1848 proven. 812 refuted. 0 times theorem prover too weak. 1516 trivial. 0 not checked. [2020-07-21 11:46:00,494 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:03,303 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1738 proven. 812 refuted. 0 times theorem prover too weak. 1626 trivial. 0 not checked. [2020-07-21 11:46:03,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [982972021] [2020-07-21 11:46:03,304 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:03,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60] total 89 [2020-07-21 11:46:03,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627985661] [2020-07-21 11:46:03,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-07-21 11:46:03,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:03,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-07-21 11:46:03,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2020-07-21 11:46:03,306 INFO L87 Difference]: Start difference. First operand 252 states and 269 transitions. Second operand 89 states. [2020-07-21 11:46:06,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:06,639 INFO L93 Difference]: Finished difference Result 499 states and 603 transitions. [2020-07-21 11:46:06,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-07-21 11:46:06,640 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 305 [2020-07-21 11:46:06,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:06,642 INFO L225 Difference]: With dead ends: 499 [2020-07-21 11:46:06,642 INFO L226 Difference]: Without dead ends: 370 [2020-07-21 11:46:06,645 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 638 GetRequests, 493 SyntacticMatches, 29 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3626 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=3597, Invalid=10209, Unknown=0, NotChecked=0, Total=13806 [2020-07-21 11:46:06,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2020-07-21 11:46:06,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 254. [2020-07-21 11:46:06,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-21 11:46:06,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 271 transitions. [2020-07-21 11:46:06,660 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 271 transitions. Word has length 305 [2020-07-21 11:46:06,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:06,661 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 271 transitions. [2020-07-21 11:46:06,661 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-07-21 11:46:06,661 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 271 transitions. [2020-07-21 11:46:06,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 308 [2020-07-21 11:46:06,664 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:06,664 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:06,877 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:06,878 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:06,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:06,879 INFO L82 PathProgramCache]: Analyzing trace with hash 191997085, now seen corresponding path program 43 times [2020-07-21 11:46:06,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:06,880 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1850434086] [2020-07-21 11:46:06,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:07,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:07,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 62 conjunts are in the unsatisfiable core [2020-07-21 11:46:07,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:09,550 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 11:46:09,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:12,648 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 11:46:12,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1850434086] [2020-07-21 11:46:12,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:12,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62] total 92 [2020-07-21 11:46:12,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447757487] [2020-07-21 11:46:12,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2020-07-21 11:46:12,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:12,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2020-07-21 11:46:12,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2020-07-21 11:46:12,651 INFO L87 Difference]: Start difference. First operand 254 states and 271 transitions. Second operand 92 states. [2020-07-21 11:46:16,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:16,224 INFO L93 Difference]: Finished difference Result 503 states and 610 transitions. [2020-07-21 11:46:16,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-07-21 11:46:16,224 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 307 [2020-07-21 11:46:16,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:16,226 INFO L225 Difference]: With dead ends: 503 [2020-07-21 11:46:16,226 INFO L226 Difference]: Without dead ends: 376 [2020-07-21 11:46:16,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 643 GetRequests, 493 SyntacticMatches, 30 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3886 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=3841, Invalid=10921, Unknown=0, NotChecked=0, Total=14762 [2020-07-21 11:46:16,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2020-07-21 11:46:16,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 256. [2020-07-21 11:46:16,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-21 11:46:16,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 273 transitions. [2020-07-21 11:46:16,245 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 273 transitions. Word has length 307 [2020-07-21 11:46:16,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:16,246 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 273 transitions. [2020-07-21 11:46:16,246 INFO L480 AbstractCegarLoop]: Interpolant automaton has 92 states. [2020-07-21 11:46:16,246 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 273 transitions. [2020-07-21 11:46:16,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2020-07-21 11:46:16,249 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:16,249 INFO L422 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:16,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:16,464 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:16,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:16,465 INFO L82 PathProgramCache]: Analyzing trace with hash -954635518, now seen corresponding path program 44 times [2020-07-21 11:46:16,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:16,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [972567860] [2020-07-21 11:46:16,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:16,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:16,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 836 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-21 11:46:16,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:17,489 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:46:17,619 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 11:46:17,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:17,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:46:19,496 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 11:46:19,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [972567860] [2020-07-21 11:46:19,497 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:19,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2020-07-21 11:46:19,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647156043] [2020-07-21 11:46:19,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 11:46:19,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:19,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 11:46:19,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=695, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 11:46:19,500 INFO L87 Difference]: Start difference. First operand 256 states and 273 transitions. Second operand 36 states. [2020-07-21 11:46:20,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:20,139 INFO L93 Difference]: Finished difference Result 275 states and 294 transitions. [2020-07-21 11:46:20,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 11:46:20,140 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 309 [2020-07-21 11:46:20,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:20,141 INFO L225 Difference]: With dead ends: 275 [2020-07-21 11:46:20,141 INFO L226 Difference]: Without dead ends: 273 [2020-07-21 11:46:20,141 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 618 GetRequests, 523 SyntacticMatches, 60 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1109 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=569, Invalid=763, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 11:46:20,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2020-07-21 11:46:20,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 268. [2020-07-21 11:46:20,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-21 11:46:20,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 286 transitions. [2020-07-21 11:46:20,154 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 286 transitions. Word has length 309 [2020-07-21 11:46:20,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:20,154 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 286 transitions. [2020-07-21 11:46:20,154 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 11:46:20,154 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 286 transitions. [2020-07-21 11:46:20,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2020-07-21 11:46:20,156 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:20,157 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 31, 31, 31, 31, 31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:20,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:20,370 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:20,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:20,370 INFO L82 PathProgramCache]: Analyzing trace with hash -2146023196, now seen corresponding path program 45 times [2020-07-21 11:46:20,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:20,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [82247871] [2020-07-21 11:46:20,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:20,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:20,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 870 conjuncts, 64 conjunts are in the unsatisfiable core [2020-07-21 11:46:20,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:22,892 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 2100 proven. 930 refuted. 0 times theorem prover too weak. 1744 trivial. 0 not checked. [2020-07-21 11:46:22,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:25,600 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 1982 proven. 930 refuted. 0 times theorem prover too weak. 1862 trivial. 0 not checked. [2020-07-21 11:46:25,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [82247871] [2020-07-21 11:46:25,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:25,601 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64] total 95 [2020-07-21 11:46:25,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299571524] [2020-07-21 11:46:25,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-07-21 11:46:25,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:25,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-07-21 11:46:25,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2020-07-21 11:46:25,604 INFO L87 Difference]: Start difference. First operand 268 states and 286 transitions. Second operand 95 states. [2020-07-21 11:46:29,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:29,824 INFO L93 Difference]: Finished difference Result 531 states and 642 transitions. [2020-07-21 11:46:29,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-21 11:46:29,824 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 325 [2020-07-21 11:46:29,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:29,827 INFO L225 Difference]: With dead ends: 531 [2020-07-21 11:46:29,828 INFO L226 Difference]: Without dead ends: 394 [2020-07-21 11:46:29,833 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 525 SyntacticMatches, 31 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4155 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=4093, Invalid=11657, Unknown=0, NotChecked=0, Total=15750 [2020-07-21 11:46:29,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2020-07-21 11:46:29,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 270. [2020-07-21 11:46:29,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-21 11:46:29,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 288 transitions. [2020-07-21 11:46:29,857 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 288 transitions. Word has length 325 [2020-07-21 11:46:29,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:29,858 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 288 transitions. [2020-07-21 11:46:29,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-07-21 11:46:29,858 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 288 transitions. [2020-07-21 11:46:29,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-21 11:46:29,862 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:29,862 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:30,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:30,077 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:30,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:30,078 INFO L82 PathProgramCache]: Analyzing trace with hash 735125513, now seen corresponding path program 46 times [2020-07-21 11:46:30,078 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:30,078 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952638984] [2020-07-21 11:46:30,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:30,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:30,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 880 conjuncts, 66 conjunts are in the unsatisfiable core [2020-07-21 11:46:30,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:33,738 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 11:46:33,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:36,638 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 11:46:36,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952638984] [2020-07-21 11:46:36,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:36,639 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66] total 98 [2020-07-21 11:46:36,639 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221919116] [2020-07-21 11:46:36,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-07-21 11:46:36,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:36,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-07-21 11:46:36,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2209, Invalid=7297, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 11:46:36,641 INFO L87 Difference]: Start difference. First operand 270 states and 288 transitions. Second operand 98 states. [2020-07-21 11:46:40,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:40,177 INFO L93 Difference]: Finished difference Result 535 states and 649 transitions. [2020-07-21 11:46:40,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-07-21 11:46:40,177 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 327 [2020-07-21 11:46:40,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:40,180 INFO L225 Difference]: With dead ends: 535 [2020-07-21 11:46:40,180 INFO L226 Difference]: Without dead ends: 400 [2020-07-21 11:46:40,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 525 SyntacticMatches, 32 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4433 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=4353, Invalid=12417, Unknown=0, NotChecked=0, Total=16770 [2020-07-21 11:46:40,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2020-07-21 11:46:40,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 272. [2020-07-21 11:46:40,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2020-07-21 11:46:40,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 290 transitions. [2020-07-21 11:46:40,199 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 290 transitions. Word has length 327 [2020-07-21 11:46:40,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:40,199 INFO L479 AbstractCegarLoop]: Abstraction has 272 states and 290 transitions. [2020-07-21 11:46:40,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-07-21 11:46:40,199 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 290 transitions. [2020-07-21 11:46:40,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2020-07-21 11:46:40,201 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:40,201 INFO L422 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:40,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:40,403 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:40,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:40,404 INFO L82 PathProgramCache]: Analyzing trace with hash -734871058, now seen corresponding path program 47 times [2020-07-21 11:46:40,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:40,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1348279843] [2020-07-21 11:46:40,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:40,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:40,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 890 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 11:46:40,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:41,740 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:46:41,878 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 11:46:41,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:41,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:46:44,419 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 11:46:44,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1348279843] [2020-07-21 11:46:44,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:44,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2020-07-21 11:46:44,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830673476] [2020-07-21 11:46:44,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 11:46:44,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:44,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 11:46:44,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=634, Invalid=772, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 11:46:44,421 INFO L87 Difference]: Start difference. First operand 272 states and 290 transitions. Second operand 38 states. [2020-07-21 11:46:45,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:46:45,104 INFO L93 Difference]: Finished difference Result 291 states and 311 transitions. [2020-07-21 11:46:45,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 11:46:45,106 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 329 [2020-07-21 11:46:45,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:46:45,109 INFO L225 Difference]: With dead ends: 291 [2020-07-21 11:46:45,109 INFO L226 Difference]: Without dead ends: 289 [2020-07-21 11:46:45,109 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 557 SyntacticMatches, 64 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=638, Invalid=844, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 11:46:45,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2020-07-21 11:46:45,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 284. [2020-07-21 11:46:45,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-21 11:46:45,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 303 transitions. [2020-07-21 11:46:45,128 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 303 transitions. Word has length 329 [2020-07-21 11:46:45,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:46:45,129 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 303 transitions. [2020-07-21 11:46:45,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 11:46:45,129 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 303 transitions. [2020-07-21 11:46:45,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2020-07-21 11:46:45,132 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:46:45,132 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 33, 33, 33, 33, 33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:46:45,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:45,348 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:46:45,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:46:45,348 INFO L82 PathProgramCache]: Analyzing trace with hash -1470347312, now seen corresponding path program 48 times [2020-07-21 11:46:45,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:46:45,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2077815920] [2020-07-21 11:46:45,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:46:45,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:46:45,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 924 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-21 11:46:45,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:46:49,411 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2368 proven. 1056 refuted. 0 times theorem prover too weak. 1988 trivial. 0 not checked. [2020-07-21 11:46:49,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:46:54,082 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2242 proven. 1056 refuted. 0 times theorem prover too weak. 2114 trivial. 0 not checked. [2020-07-21 11:46:54,082 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2077815920] [2020-07-21 11:46:54,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:46:54,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68] total 101 [2020-07-21 11:46:54,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619371185] [2020-07-21 11:46:54,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-21 11:46:54,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:46:54,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-21 11:46:54,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2020-07-21 11:46:54,085 INFO L87 Difference]: Start difference. First operand 284 states and 303 transitions. Second operand 101 states. [2020-07-21 11:47:00,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:47:00,115 INFO L93 Difference]: Finished difference Result 563 states and 681 transitions. [2020-07-21 11:47:00,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2020-07-21 11:47:00,116 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 345 [2020-07-21 11:47:00,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:47:00,118 INFO L225 Difference]: With dead ends: 563 [2020-07-21 11:47:00,119 INFO L226 Difference]: Without dead ends: 418 [2020-07-21 11:47:00,121 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 557 SyntacticMatches, 33 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4720 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=4621, Invalid=13201, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 11:47:00,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2020-07-21 11:47:00,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 286. [2020-07-21 11:47:00,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2020-07-21 11:47:00,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 305 transitions. [2020-07-21 11:47:00,140 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 305 transitions. Word has length 345 [2020-07-21 11:47:00,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:47:00,141 INFO L479 AbstractCegarLoop]: Abstraction has 286 states and 305 transitions. [2020-07-21 11:47:00,141 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-21 11:47:00,141 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 305 transitions. [2020-07-21 11:47:00,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2020-07-21 11:47:00,144 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:47:00,144 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 33, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:47:00,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:00,360 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:47:00,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:47:00,361 INFO L82 PathProgramCache]: Analyzing trace with hash 2069961333, now seen corresponding path program 49 times [2020-07-21 11:47:00,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:47:00,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1034065602] [2020-07-21 11:47:00,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:00,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:47:00,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 934 conjuncts, 70 conjunts are in the unsatisfiable core [2020-07-21 11:47:00,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:47:04,830 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 11:47:04,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:47:10,117 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 11:47:10,117 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1034065602] [2020-07-21 11:47:10,118 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:47:10,118 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70] total 104 [2020-07-21 11:47:10,118 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729615434] [2020-07-21 11:47:10,119 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2020-07-21 11:47:10,119 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:47:10,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2020-07-21 11:47:10,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2483, Invalid=8229, Unknown=0, NotChecked=0, Total=10712 [2020-07-21 11:47:10,121 INFO L87 Difference]: Start difference. First operand 286 states and 305 transitions. Second operand 104 states. [2020-07-21 11:47:16,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:47:16,027 INFO L93 Difference]: Finished difference Result 567 states and 688 transitions. [2020-07-21 11:47:16,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-21 11:47:16,028 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 347 [2020-07-21 11:47:16,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:47:16,030 INFO L225 Difference]: With dead ends: 567 [2020-07-21 11:47:16,030 INFO L226 Difference]: Without dead ends: 424 [2020-07-21 11:47:16,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 727 GetRequests, 557 SyntacticMatches, 34 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5016 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=4897, Invalid=14009, Unknown=0, NotChecked=0, Total=18906 [2020-07-21 11:47:16,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2020-07-21 11:47:16,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 288. [2020-07-21 11:47:16,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-21 11:47:16,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 307 transitions. [2020-07-21 11:47:16,046 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 307 transitions. Word has length 347 [2020-07-21 11:47:16,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:47:16,047 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 307 transitions. [2020-07-21 11:47:16,047 INFO L480 AbstractCegarLoop]: Interpolant automaton has 104 states. [2020-07-21 11:47:16,047 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 307 transitions. [2020-07-21 11:47:16,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2020-07-21 11:47:16,050 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:47:16,051 INFO L422 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:47:16,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:16,264 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:47:16,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:47:16,265 INFO L82 PathProgramCache]: Analyzing trace with hash -1602496550, now seen corresponding path program 50 times [2020-07-21 11:47:16,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:47:16,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1472072256] [2020-07-21 11:47:16,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:16,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:47:16,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 944 conjuncts, 71 conjunts are in the unsatisfiable core [2020-07-21 11:47:16,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:47:17,903 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:47:18,087 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 11:47:18,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:47:18,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:47:21,200 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 11:47:21,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1472072256] [2020-07-21 11:47:21,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:47:21,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2020-07-21 11:47:21,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006075230] [2020-07-21 11:47:21,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-21 11:47:21,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:47:21,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-21 11:47:21,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=707, Invalid=853, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 11:47:21,203 INFO L87 Difference]: Start difference. First operand 288 states and 307 transitions. Second operand 40 states. [2020-07-21 11:47:22,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:47:22,074 INFO L93 Difference]: Finished difference Result 307 states and 328 transitions. [2020-07-21 11:47:22,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 11:47:22,077 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 349 [2020-07-21 11:47:22,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:47:22,079 INFO L225 Difference]: With dead ends: 307 [2020-07-21 11:47:22,080 INFO L226 Difference]: Without dead ends: 305 [2020-07-21 11:47:22,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 591 SyntacticMatches, 68 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1393 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=711, Invalid=929, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 11:47:22,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2020-07-21 11:47:22,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 300. [2020-07-21 11:47:22,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-07-21 11:47:22,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 320 transitions. [2020-07-21 11:47:22,093 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 320 transitions. Word has length 349 [2020-07-21 11:47:22,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:47:22,093 INFO L479 AbstractCegarLoop]: Abstraction has 300 states and 320 transitions. [2020-07-21 11:47:22,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-21 11:47:22,094 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 320 transitions. [2020-07-21 11:47:22,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2020-07-21 11:47:22,097 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:47:22,097 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 35, 35, 35, 35, 35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:47:22,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:22,310 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:47:22,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:47:22,311 INFO L82 PathProgramCache]: Analyzing trace with hash 242484668, now seen corresponding path program 51 times [2020-07-21 11:47:22,311 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:47:22,311 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1398546443] [2020-07-21 11:47:22,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:22,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:47:22,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 978 conjuncts, 72 conjunts are in the unsatisfiable core [2020-07-21 11:47:22,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:47:27,330 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2652 proven. 1190 refuted. 0 times theorem prover too weak. 2248 trivial. 0 not checked. [2020-07-21 11:47:27,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:47:33,304 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2518 proven. 1190 refuted. 0 times theorem prover too weak. 2382 trivial. 0 not checked. [2020-07-21 11:47:33,305 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1398546443] [2020-07-21 11:47:33,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:47:33,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72] total 107 [2020-07-21 11:47:33,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265316764] [2020-07-21 11:47:33,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2020-07-21 11:47:33,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:47:33,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2020-07-21 11:47:33,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2020-07-21 11:47:33,308 INFO L87 Difference]: Start difference. First operand 300 states and 320 transitions. Second operand 107 states. [2020-07-21 11:47:40,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:47:40,274 INFO L93 Difference]: Finished difference Result 595 states and 720 transitions. [2020-07-21 11:47:40,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-07-21 11:47:40,275 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 365 [2020-07-21 11:47:40,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:47:40,277 INFO L225 Difference]: With dead ends: 595 [2020-07-21 11:47:40,278 INFO L226 Difference]: Without dead ends: 442 [2020-07-21 11:47:40,280 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 589 SyntacticMatches, 35 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5321 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=5181, Invalid=14841, Unknown=0, NotChecked=0, Total=20022 [2020-07-21 11:47:40,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2020-07-21 11:47:40,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 302. [2020-07-21 11:47:40,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-07-21 11:47:40,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 322 transitions. [2020-07-21 11:47:40,293 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 322 transitions. Word has length 365 [2020-07-21 11:47:40,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:47:40,293 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 322 transitions. [2020-07-21 11:47:40,294 INFO L480 AbstractCegarLoop]: Interpolant automaton has 107 states. [2020-07-21 11:47:40,294 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 322 transitions. [2020-07-21 11:47:40,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 368 [2020-07-21 11:47:40,296 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:47:40,296 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:47:40,497 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:40,497 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:47:40,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:47:40,498 INFO L82 PathProgramCache]: Analyzing trace with hash -814607391, now seen corresponding path program 52 times [2020-07-21 11:47:40,498 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:47:40,499 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1167388393] [2020-07-21 11:47:40,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:47:40,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:47:40,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 988 conjuncts, 74 conjunts are in the unsatisfiable core [2020-07-21 11:47:40,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:47:46,209 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 11:47:46,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:47:52,760 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 11:47:52,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1167388393] [2020-07-21 11:47:52,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:47:52,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74] total 110 [2020-07-21 11:47:52,762 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878897934] [2020-07-21 11:47:52,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2020-07-21 11:47:52,763 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:47:52,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2020-07-21 11:47:52,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2773, Invalid=9217, Unknown=0, NotChecked=0, Total=11990 [2020-07-21 11:47:52,765 INFO L87 Difference]: Start difference. First operand 302 states and 322 transitions. Second operand 110 states. [2020-07-21 11:48:01,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:48:01,232 INFO L93 Difference]: Finished difference Result 599 states and 727 transitions. [2020-07-21 11:48:01,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2020-07-21 11:48:01,232 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 367 [2020-07-21 11:48:01,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:48:01,234 INFO L225 Difference]: With dead ends: 599 [2020-07-21 11:48:01,235 INFO L226 Difference]: Without dead ends: 448 [2020-07-21 11:48:01,237 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 769 GetRequests, 589 SyntacticMatches, 36 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5635 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=5473, Invalid=15697, Unknown=0, NotChecked=0, Total=21170 [2020-07-21 11:48:01,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2020-07-21 11:48:01,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 304. [2020-07-21 11:48:01,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-21 11:48:01,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 324 transitions. [2020-07-21 11:48:01,260 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 324 transitions. Word has length 367 [2020-07-21 11:48:01,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:48:01,260 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 324 transitions. [2020-07-21 11:48:01,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 110 states. [2020-07-21 11:48:01,260 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 324 transitions. [2020-07-21 11:48:01,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2020-07-21 11:48:01,264 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:48:01,264 INFO L422 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:48:01,478 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:01,478 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:48:01,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:48:01,479 INFO L82 PathProgramCache]: Analyzing trace with hash 1227173062, now seen corresponding path program 53 times [2020-07-21 11:48:01,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:48:01,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1769909154] [2020-07-21 11:48:01,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:01,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:48:01,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 75 conjunts are in the unsatisfiable core [2020-07-21 11:48:01,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:48:03,549 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:48:03,731 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 11:48:03,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:48:03,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:48:07,661 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 11:48:07,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1769909154] [2020-07-21 11:48:07,662 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:48:07,662 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 42 [2020-07-21 11:48:07,662 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828903632] [2020-07-21 11:48:07,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-21 11:48:07,663 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:48:07,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-21 11:48:07,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=784, Invalid=938, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 11:48:07,664 INFO L87 Difference]: Start difference. First operand 304 states and 324 transitions. Second operand 42 states. [2020-07-21 11:48:08,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:48:08,751 INFO L93 Difference]: Finished difference Result 323 states and 345 transitions. [2020-07-21 11:48:08,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 11:48:08,754 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 369 [2020-07-21 11:48:08,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:48:08,757 INFO L225 Difference]: With dead ends: 323 [2020-07-21 11:48:08,757 INFO L226 Difference]: Without dead ends: 321 [2020-07-21 11:48:08,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 738 GetRequests, 625 SyntacticMatches, 72 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1547 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=788, Invalid=1018, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 11:48:08,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-21 11:48:08,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 316. [2020-07-21 11:48:08,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-21 11:48:08,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 337 transitions. [2020-07-21 11:48:08,772 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 337 transitions. Word has length 369 [2020-07-21 11:48:08,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:48:08,772 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 337 transitions. [2020-07-21 11:48:08,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-21 11:48:08,772 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 337 transitions. [2020-07-21 11:48:08,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 386 [2020-07-21 11:48:08,776 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:48:08,776 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 37, 37, 37, 37, 37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:48:08,991 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:08,992 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:48:08,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:48:08,993 INFO L82 PathProgramCache]: Analyzing trace with hash 1586365096, now seen corresponding path program 54 times [2020-07-21 11:48:08,993 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:48:08,993 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1060170128] [2020-07-21 11:48:08,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:09,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:48:09,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 1032 conjuncts, 76 conjunts are in the unsatisfiable core [2020-07-21 11:48:09,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:48:15,330 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2952 proven. 1332 refuted. 0 times theorem prover too weak. 2524 trivial. 0 not checked. [2020-07-21 11:48:15,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:48:22,701 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2810 proven. 1332 refuted. 0 times theorem prover too weak. 2666 trivial. 0 not checked. [2020-07-21 11:48:22,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1060170128] [2020-07-21 11:48:22,701 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:48:22,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76] total 113 [2020-07-21 11:48:22,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347502310] [2020-07-21 11:48:22,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2020-07-21 11:48:22,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:48:22,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2020-07-21 11:48:22,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2020-07-21 11:48:22,704 INFO L87 Difference]: Start difference. First operand 316 states and 337 transitions. Second operand 113 states. [2020-07-21 11:48:31,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:48:31,070 INFO L93 Difference]: Finished difference Result 627 states and 759 transitions. [2020-07-21 11:48:31,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-21 11:48:31,070 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 385 [2020-07-21 11:48:31,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:48:31,073 INFO L225 Difference]: With dead ends: 627 [2020-07-21 11:48:31,073 INFO L226 Difference]: Without dead ends: 466 [2020-07-21 11:48:31,075 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 806 GetRequests, 621 SyntacticMatches, 37 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5958 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=5773, Invalid=16577, Unknown=0, NotChecked=0, Total=22350 [2020-07-21 11:48:31,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2020-07-21 11:48:31,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 318. [2020-07-21 11:48:31,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2020-07-21 11:48:31,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 339 transitions. [2020-07-21 11:48:31,090 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 339 transitions. Word has length 385 [2020-07-21 11:48:31,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:48:31,090 INFO L479 AbstractCegarLoop]: Abstraction has 318 states and 339 transitions. [2020-07-21 11:48:31,091 INFO L480 AbstractCegarLoop]: Interpolant automaton has 113 states. [2020-07-21 11:48:31,091 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 339 transitions. [2020-07-21 11:48:31,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2020-07-21 11:48:31,093 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:48:31,093 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 37, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:48:31,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:31,295 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:48:31,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:48:31,295 INFO L82 PathProgramCache]: Analyzing trace with hash -468415411, now seen corresponding path program 55 times [2020-07-21 11:48:31,296 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:48:31,296 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029973556] [2020-07-21 11:48:31,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:31,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:48:31,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 1042 conjuncts, 78 conjunts are in the unsatisfiable core [2020-07-21 11:48:31,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:48:38,214 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 11:48:38,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:48:46,334 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 11:48:46,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029973556] [2020-07-21 11:48:46,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:48:46,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78] total 116 [2020-07-21 11:48:46,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922419258] [2020-07-21 11:48:46,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2020-07-21 11:48:46,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:48:46,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2020-07-21 11:48:46,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3079, Invalid=10261, Unknown=0, NotChecked=0, Total=13340 [2020-07-21 11:48:46,339 INFO L87 Difference]: Start difference. First operand 318 states and 339 transitions. Second operand 116 states. [2020-07-21 11:48:55,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:48:55,512 INFO L93 Difference]: Finished difference Result 631 states and 766 transitions. [2020-07-21 11:48:55,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2020-07-21 11:48:55,513 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 387 [2020-07-21 11:48:55,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:48:55,515 INFO L225 Difference]: With dead ends: 631 [2020-07-21 11:48:55,515 INFO L226 Difference]: Without dead ends: 472 [2020-07-21 11:48:55,520 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 811 GetRequests, 621 SyntacticMatches, 38 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6290 ImplicationChecksByTransitivity, 18.1s TimeCoverageRelationStatistics Valid=6081, Invalid=17481, Unknown=0, NotChecked=0, Total=23562 [2020-07-21 11:48:55,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-07-21 11:48:55,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 320. [2020-07-21 11:48:55,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 320 states. [2020-07-21 11:48:55,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 341 transitions. [2020-07-21 11:48:55,538 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 341 transitions. Word has length 387 [2020-07-21 11:48:55,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:48:55,538 INFO L479 AbstractCegarLoop]: Abstraction has 320 states and 341 transitions. [2020-07-21 11:48:55,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 116 states. [2020-07-21 11:48:55,538 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 341 transitions. [2020-07-21 11:48:55,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2020-07-21 11:48:55,542 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:48:55,542 INFO L422 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:48:55,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:55,749 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:48:55,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:48:55,750 INFO L82 PathProgramCache]: Analyzing trace with hash 572473522, now seen corresponding path program 56 times [2020-07-21 11:48:55,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:48:55,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1423501253] [2020-07-21 11:48:55,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:48:55,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:48:55,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 1052 conjuncts, 79 conjunts are in the unsatisfiable core [2020-07-21 11:48:55,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:48:58,253 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:48:58,455 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 11:48:58,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:48:58,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:49:03,317 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 11:49:03,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1423501253] [2020-07-21 11:49:03,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:49:03,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43] total 44 [2020-07-21 11:49:03,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668292997] [2020-07-21 11:49:03,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 11:49:03,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:49:03,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 11:49:03,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=865, Invalid=1027, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 11:49:03,320 INFO L87 Difference]: Start difference. First operand 320 states and 341 transitions. Second operand 44 states. [2020-07-21 11:49:04,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:49:04,708 INFO L93 Difference]: Finished difference Result 339 states and 362 transitions. [2020-07-21 11:49:04,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 11:49:04,710 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 389 [2020-07-21 11:49:04,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:49:04,712 INFO L225 Difference]: With dead ends: 339 [2020-07-21 11:49:04,712 INFO L226 Difference]: Without dead ends: 337 [2020-07-21 11:49:04,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 778 GetRequests, 659 SyntacticMatches, 76 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1709 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=869, Invalid=1111, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 11:49:04,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2020-07-21 11:49:04,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 332. [2020-07-21 11:49:04,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-07-21 11:49:04,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 354 transitions. [2020-07-21 11:49:04,729 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 354 transitions. Word has length 389 [2020-07-21 11:49:04,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:49:04,729 INFO L479 AbstractCegarLoop]: Abstraction has 332 states and 354 transitions. [2020-07-21 11:49:04,729 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 11:49:04,730 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 354 transitions. [2020-07-21 11:49:04,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2020-07-21 11:49:04,733 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:49:04,733 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 39, 39, 39, 39, 39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:49:04,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:49:04,934 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:49:04,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:49:04,935 INFO L82 PathProgramCache]: Analyzing trace with hash -73744748, now seen corresponding path program 57 times [2020-07-21 11:49:04,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:49:04,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730838717] [2020-07-21 11:49:04,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:49:05,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:49:05,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 1086 conjuncts, 80 conjunts are in the unsatisfiable core [2020-07-21 11:49:05,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:49:12,728 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3268 proven. 1482 refuted. 0 times theorem prover too weak. 2816 trivial. 0 not checked. [2020-07-21 11:49:12,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:49:21,827 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3118 proven. 1482 refuted. 0 times theorem prover too weak. 2966 trivial. 0 not checked. [2020-07-21 11:49:21,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730838717] [2020-07-21 11:49:21,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:49:21,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80] total 119 [2020-07-21 11:49:21,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47089420] [2020-07-21 11:49:21,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2020-07-21 11:49:21,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:49:21,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2020-07-21 11:49:21,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2020-07-21 11:49:21,831 INFO L87 Difference]: Start difference. First operand 332 states and 354 transitions. Second operand 119 states. [2020-07-21 11:49:32,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:49:32,750 INFO L93 Difference]: Finished difference Result 659 states and 798 transitions. [2020-07-21 11:49:32,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2020-07-21 11:49:32,750 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 405 [2020-07-21 11:49:32,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:49:32,753 INFO L225 Difference]: With dead ends: 659 [2020-07-21 11:49:32,753 INFO L226 Difference]: Without dead ends: 490 [2020-07-21 11:49:32,757 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 653 SyntacticMatches, 39 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6631 ImplicationChecksByTransitivity, 20.3s TimeCoverageRelationStatistics Valid=6397, Invalid=18409, Unknown=0, NotChecked=0, Total=24806 [2020-07-21 11:49:32,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-21 11:49:32,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 334. [2020-07-21 11:49:32,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 334 states. [2020-07-21 11:49:32,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 356 transitions. [2020-07-21 11:49:32,774 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 356 transitions. Word has length 405 [2020-07-21 11:49:32,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:49:32,774 INFO L479 AbstractCegarLoop]: Abstraction has 334 states and 356 transitions. [2020-07-21 11:49:32,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 119 states. [2020-07-21 11:49:32,774 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 356 transitions. [2020-07-21 11:49:32,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-07-21 11:49:32,778 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:49:32,779 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 39, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:49:32,991 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:49:32,992 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:49:32,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:49:32,993 INFO L82 PathProgramCache]: Analyzing trace with hash 2082014137, now seen corresponding path program 58 times [2020-07-21 11:49:32,993 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:49:32,993 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952267887] [2020-07-21 11:49:32,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:49:33,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:49:33,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 1096 conjuncts, 82 conjunts are in the unsatisfiable core [2020-07-21 11:49:33,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:49:41,497 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 11:49:41,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:49:51,591 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 11:49:51,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952267887] [2020-07-21 11:49:51,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:49:51,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82] total 122 [2020-07-21 11:49:51,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120252831] [2020-07-21 11:49:51,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2020-07-21 11:49:51,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:49:51,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2020-07-21 11:49:51,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3401, Invalid=11361, Unknown=0, NotChecked=0, Total=14762 [2020-07-21 11:49:51,595 INFO L87 Difference]: Start difference. First operand 334 states and 356 transitions. Second operand 122 states. [2020-07-21 11:50:03,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:50:03,012 INFO L93 Difference]: Finished difference Result 663 states and 805 transitions. [2020-07-21 11:50:03,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-21 11:50:03,012 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 407 [2020-07-21 11:50:03,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:50:03,015 INFO L225 Difference]: With dead ends: 663 [2020-07-21 11:50:03,015 INFO L226 Difference]: Without dead ends: 496 [2020-07-21 11:50:03,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 853 GetRequests, 653 SyntacticMatches, 40 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6981 ImplicationChecksByTransitivity, 22.5s TimeCoverageRelationStatistics Valid=6721, Invalid=19361, Unknown=0, NotChecked=0, Total=26082 [2020-07-21 11:50:03,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2020-07-21 11:50:03,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 336. [2020-07-21 11:50:03,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 336 states. [2020-07-21 11:50:03,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 358 transitions. [2020-07-21 11:50:03,035 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 358 transitions. Word has length 407 [2020-07-21 11:50:03,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:50:03,035 INFO L479 AbstractCegarLoop]: Abstraction has 336 states and 358 transitions. [2020-07-21 11:50:03,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 122 states. [2020-07-21 11:50:03,035 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 358 transitions. [2020-07-21 11:50:03,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2020-07-21 11:50:03,038 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:50:03,038 INFO L422 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:50:03,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:50:03,239 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:50:03,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:50:03,240 INFO L82 PathProgramCache]: Analyzing trace with hash -702901346, now seen corresponding path program 59 times [2020-07-21 11:50:03,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:50:03,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [211334491] [2020-07-21 11:50:03,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:50:03,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:50:03,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 1106 conjuncts, 83 conjunts are in the unsatisfiable core [2020-07-21 11:50:03,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:50:06,375 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:50:06,633 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 11:50:06,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:50:06,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:50:12,724 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 11:50:12,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [211334491] [2020-07-21 11:50:12,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:50:12,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45] total 46 [2020-07-21 11:50:12,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561404558] [2020-07-21 11:50:12,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-21 11:50:12,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:50:12,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-21 11:50:12,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=950, Invalid=1120, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 11:50:12,727 INFO L87 Difference]: Start difference. First operand 336 states and 358 transitions. Second operand 46 states. [2020-07-21 11:50:14,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:50:14,309 INFO L93 Difference]: Finished difference Result 355 states and 379 transitions. [2020-07-21 11:50:14,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-21 11:50:14,312 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 409 [2020-07-21 11:50:14,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:50:14,316 INFO L225 Difference]: With dead ends: 355 [2020-07-21 11:50:14,317 INFO L226 Difference]: Without dead ends: 353 [2020-07-21 11:50:14,318 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 693 SyntacticMatches, 80 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1879 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=954, Invalid=1208, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 11:50:14,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-21 11:50:14,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 348. [2020-07-21 11:50:14,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-21 11:50:14,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 371 transitions. [2020-07-21 11:50:14,338 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 371 transitions. Word has length 409 [2020-07-21 11:50:14,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:50:14,338 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 371 transitions. [2020-07-21 11:50:14,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-07-21 11:50:14,338 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 371 transitions. [2020-07-21 11:50:14,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2020-07-21 11:50:14,341 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:50:14,341 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 41, 41, 41, 41, 41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:50:14,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:50:14,543 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:50:14,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:50:14,544 INFO L82 PathProgramCache]: Analyzing trace with hash 524990848, now seen corresponding path program 60 times [2020-07-21 11:50:14,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:50:14,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [114246214] [2020-07-21 11:50:14,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:50:14,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:50:14,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 1140 conjuncts, 84 conjunts are in the unsatisfiable core [2020-07-21 11:50:14,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:50:24,119 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3600 proven. 1640 refuted. 0 times theorem prover too weak. 3124 trivial. 0 not checked. [2020-07-21 11:50:24,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:50:35,521 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3442 proven. 1640 refuted. 0 times theorem prover too weak. 3282 trivial. 0 not checked. [2020-07-21 11:50:35,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [114246214] [2020-07-21 11:50:35,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:50:35,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84] total 125 [2020-07-21 11:50:35,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750289156] [2020-07-21 11:50:35,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 125 states [2020-07-21 11:50:35,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:50:35,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2020-07-21 11:50:35,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3568, Invalid=11932, Unknown=0, NotChecked=0, Total=15500 [2020-07-21 11:50:35,526 INFO L87 Difference]: Start difference. First operand 348 states and 371 transitions. Second operand 125 states. [2020-07-21 11:50:49,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:50:49,280 INFO L93 Difference]: Finished difference Result 691 states and 837 transitions. [2020-07-21 11:50:49,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-21 11:50:49,280 INFO L78 Accepts]: Start accepts. Automaton has 125 states. Word has length 425 [2020-07-21 11:50:49,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:50:49,283 INFO L225 Difference]: With dead ends: 691 [2020-07-21 11:50:49,283 INFO L226 Difference]: Without dead ends: 514 [2020-07-21 11:50:49,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 890 GetRequests, 685 SyntacticMatches, 41 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7340 ImplicationChecksByTransitivity, 25.6s TimeCoverageRelationStatistics Valid=7053, Invalid=20337, Unknown=0, NotChecked=0, Total=27390 [2020-07-21 11:50:49,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-21 11:50:49,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 350. [2020-07-21 11:50:49,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2020-07-21 11:50:49,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 373 transitions. [2020-07-21 11:50:49,304 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 373 transitions. Word has length 425 [2020-07-21 11:50:49,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:50:49,304 INFO L479 AbstractCegarLoop]: Abstraction has 350 states and 373 transitions. [2020-07-21 11:50:49,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 125 states. [2020-07-21 11:50:49,305 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 373 transitions. [2020-07-21 11:50:49,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 428 [2020-07-21 11:50:49,307 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:50:49,307 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:50:49,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:50:49,509 INFO L427 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:50:49,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:50:49,510 INFO L82 PathProgramCache]: Analyzing trace with hash -2129659355, now seen corresponding path program 61 times [2020-07-21 11:50:49,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:50:49,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [282475260] [2020-07-21 11:50:49,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:50:49,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:50:49,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 1150 conjuncts, 86 conjunts are in the unsatisfiable core [2020-07-21 11:50:49,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:50:59,701 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 11:50:59,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:51:07,626 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 11:51:07,626 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [282475260] [2020-07-21 11:51:07,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:51:07,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86] total 128 [2020-07-21 11:51:07,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466679753] [2020-07-21 11:51:07,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2020-07-21 11:51:07,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:51:07,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2020-07-21 11:51:07,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3739, Invalid=12517, Unknown=0, NotChecked=0, Total=16256 [2020-07-21 11:51:07,630 INFO L87 Difference]: Start difference. First operand 350 states and 373 transitions. Second operand 128 states. [2020-07-21 11:51:15,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:51:15,329 INFO L93 Difference]: Finished difference Result 695 states and 844 transitions. [2020-07-21 11:51:15,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-21 11:51:15,330 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 427 [2020-07-21 11:51:15,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:51:15,332 INFO L225 Difference]: With dead ends: 695 [2020-07-21 11:51:15,333 INFO L226 Difference]: Without dead ends: 520 [2020-07-21 11:51:15,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 895 GetRequests, 685 SyntacticMatches, 42 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7708 ImplicationChecksByTransitivity, 20.5s TimeCoverageRelationStatistics Valid=7393, Invalid=21337, Unknown=0, NotChecked=0, Total=28730 [2020-07-21 11:51:15,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2020-07-21 11:51:15,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 352. [2020-07-21 11:51:15,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-21 11:51:15,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 375 transitions. [2020-07-21 11:51:15,347 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 375 transitions. Word has length 427 [2020-07-21 11:51:15,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:51:15,348 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 375 transitions. [2020-07-21 11:51:15,348 INFO L480 AbstractCegarLoop]: Interpolant automaton has 128 states. [2020-07-21 11:51:15,348 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 375 transitions. [2020-07-21 11:51:15,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 430 [2020-07-21 11:51:15,351 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:51:15,351 INFO L422 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:51:15,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:51:15,565 INFO L427 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:51:15,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:51:15,566 INFO L82 PathProgramCache]: Analyzing trace with hash -2037930614, now seen corresponding path program 62 times [2020-07-21 11:51:15,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:51:15,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1505829106] [2020-07-21 11:51:15,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:51:15,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:51:15,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 1160 conjuncts, 87 conjunts are in the unsatisfiable core [2020-07-21 11:51:15,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:51:17,640 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:51:17,826 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 11:51:17,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:51:17,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:51:21,995 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 11:51:21,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1505829106] [2020-07-21 11:51:21,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:51:21,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47] total 48 [2020-07-21 11:51:21,995 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97811596] [2020-07-21 11:51:21,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 11:51:21,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:51:21,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 11:51:21,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1039, Invalid=1217, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 11:51:21,996 INFO L87 Difference]: Start difference. First operand 352 states and 375 transitions. Second operand 48 states. [2020-07-21 11:51:22,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:51:22,944 INFO L93 Difference]: Finished difference Result 371 states and 396 transitions. [2020-07-21 11:51:22,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 11:51:22,946 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 429 [2020-07-21 11:51:22,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:51:22,949 INFO L225 Difference]: With dead ends: 371 [2020-07-21 11:51:22,949 INFO L226 Difference]: Without dead ends: 369 [2020-07-21 11:51:22,949 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 858 GetRequests, 727 SyntacticMatches, 84 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2057 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=1043, Invalid=1309, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 11:51:22,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-21 11:51:22,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 364. [2020-07-21 11:51:22,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2020-07-21 11:51:22,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 388 transitions. [2020-07-21 11:51:22,962 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 388 transitions. Word has length 429 [2020-07-21 11:51:22,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:51:22,963 INFO L479 AbstractCegarLoop]: Abstraction has 364 states and 388 transitions. [2020-07-21 11:51:22,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 11:51:22,963 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 388 transitions. [2020-07-21 11:51:22,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 446 [2020-07-21 11:51:22,965 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:51:22,965 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 43, 43, 43, 43, 43, 43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:51:23,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:51:23,166 INFO L427 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:51:23,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:51:23,167 INFO L82 PathProgramCache]: Analyzing trace with hash -99716244, now seen corresponding path program 63 times [2020-07-21 11:51:23,167 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:51:23,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407600460] [2020-07-21 11:51:23,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:51:23,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:51:23,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 1194 conjuncts, 88 conjunts are in the unsatisfiable core [2020-07-21 11:51:23,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:51:29,627 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3948 proven. 1806 refuted. 0 times theorem prover too weak. 3448 trivial. 0 not checked. [2020-07-21 11:51:29,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:51:36,599 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3782 proven. 1806 refuted. 0 times theorem prover too weak. 3614 trivial. 0 not checked. [2020-07-21 11:51:36,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407600460] [2020-07-21 11:51:36,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:51:36,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88] total 131 [2020-07-21 11:51:36,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464441850] [2020-07-21 11:51:36,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2020-07-21 11:51:36,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:51:36,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2020-07-21 11:51:36,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3914, Invalid=13116, Unknown=0, NotChecked=0, Total=17030 [2020-07-21 11:51:36,603 INFO L87 Difference]: Start difference. First operand 364 states and 388 transitions. Second operand 131 states. [2020-07-21 11:51:44,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:51:44,709 INFO L93 Difference]: Finished difference Result 723 states and 876 transitions. [2020-07-21 11:51:44,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-21 11:51:44,709 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 445 [2020-07-21 11:51:44,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:51:44,711 INFO L225 Difference]: With dead ends: 723 [2020-07-21 11:51:44,711 INFO L226 Difference]: Without dead ends: 538 [2020-07-21 11:51:44,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 717 SyntacticMatches, 43 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8085 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=7741, Invalid=22361, Unknown=0, NotChecked=0, Total=30102 [2020-07-21 11:51:44,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2020-07-21 11:51:44,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 366. [2020-07-21 11:51:44,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 366 states. [2020-07-21 11:51:44,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 390 transitions. [2020-07-21 11:51:44,726 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 390 transitions. Word has length 445 [2020-07-21 11:51:44,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:51:44,726 INFO L479 AbstractCegarLoop]: Abstraction has 366 states and 390 transitions. [2020-07-21 11:51:44,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 131 states. [2020-07-21 11:51:44,726 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 390 transitions. [2020-07-21 11:51:44,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2020-07-21 11:51:44,729 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:51:44,729 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 44, 43, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:51:44,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:51:44,937 INFO L427 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:51:44,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:51:44,938 INFO L82 PathProgramCache]: Analyzing trace with hash 592048017, now seen corresponding path program 64 times [2020-07-21 11:51:44,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:51:44,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1650792407] [2020-07-21 11:51:44,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:51:45,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:51:45,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 1204 conjuncts, 90 conjunts are in the unsatisfiable core [2020-07-21 11:51:45,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:51:52,435 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 11:51:52,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:52:01,224 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 11:52:01,225 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1650792407] [2020-07-21 11:52:01,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:52:01,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90] total 134 [2020-07-21 11:52:01,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187355140] [2020-07-21 11:52:01,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2020-07-21 11:52:01,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:52:01,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2020-07-21 11:52:01,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 11:52:01,227 INFO L87 Difference]: Start difference. First operand 366 states and 390 transitions. Second operand 134 states. [2020-07-21 11:52:11,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:52:11,705 INFO L93 Difference]: Finished difference Result 727 states and 883 transitions. [2020-07-21 11:52:11,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-07-21 11:52:11,705 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 447 [2020-07-21 11:52:11,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:52:11,707 INFO L225 Difference]: With dead ends: 727 [2020-07-21 11:52:11,707 INFO L226 Difference]: Without dead ends: 544 [2020-07-21 11:52:11,710 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 937 GetRequests, 717 SyntacticMatches, 44 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8471 ImplicationChecksByTransitivity, 19.8s TimeCoverageRelationStatistics Valid=8097, Invalid=23409, Unknown=0, NotChecked=0, Total=31506 [2020-07-21 11:52:11,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2020-07-21 11:52:11,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 368. [2020-07-21 11:52:11,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-21 11:52:11,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 392 transitions. [2020-07-21 11:52:11,727 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 392 transitions. Word has length 447 [2020-07-21 11:52:11,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:52:11,728 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 392 transitions. [2020-07-21 11:52:11,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 134 states. [2020-07-21 11:52:11,728 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 392 transitions. [2020-07-21 11:52:11,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-21 11:52:11,730 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:52:11,730 INFO L422 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 44, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:52:11,930 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:52:11,931 INFO L427 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:52:11,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:52:11,932 INFO L82 PathProgramCache]: Analyzing trace with hash -342428042, now seen corresponding path program 65 times [2020-07-21 11:52:11,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:52:11,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [984220523] [2020-07-21 11:52:11,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:52:12,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:52:12,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 1214 conjuncts, 91 conjunts are in the unsatisfiable core [2020-07-21 11:52:12,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:52:14,667 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:52:14,893 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 11:52:14,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:52:15,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:52:20,334 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 11:52:20,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [984220523] [2020-07-21 11:52:20,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:52:20,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 50 [2020-07-21 11:52:20,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88051920] [2020-07-21 11:52:20,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 11:52:20,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:52:20,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 11:52:20,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1132, Invalid=1318, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 11:52:20,337 INFO L87 Difference]: Start difference. First operand 368 states and 392 transitions. Second operand 50 states. [2020-07-21 11:52:21,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:52:21,641 INFO L93 Difference]: Finished difference Result 387 states and 413 transitions. [2020-07-21 11:52:21,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 11:52:21,643 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 449 [2020-07-21 11:52:21,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:52:21,646 INFO L225 Difference]: With dead ends: 387 [2020-07-21 11:52:21,646 INFO L226 Difference]: Without dead ends: 385 [2020-07-21 11:52:21,647 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 898 GetRequests, 761 SyntacticMatches, 88 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2243 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=1136, Invalid=1414, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 11:52:21,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2020-07-21 11:52:21,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 380. [2020-07-21 11:52:21,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 380 states. [2020-07-21 11:52:21,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 405 transitions. [2020-07-21 11:52:21,664 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 405 transitions. Word has length 449 [2020-07-21 11:52:21,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:52:21,665 INFO L479 AbstractCegarLoop]: Abstraction has 380 states and 405 transitions. [2020-07-21 11:52:21,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 11:52:21,665 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 405 transitions. [2020-07-21 11:52:21,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-21 11:52:21,667 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:52:21,667 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 45, 45, 45, 45, 45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:52:21,868 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:52:21,868 INFO L427 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:52:21,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:52:21,869 INFO L82 PathProgramCache]: Analyzing trace with hash -753505192, now seen corresponding path program 66 times [2020-07-21 11:52:21,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:52:21,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [397103628] [2020-07-21 11:52:21,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:52:22,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:52:22,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 1248 conjuncts, 92 conjunts are in the unsatisfiable core [2020-07-21 11:52:22,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:52:31,099 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4312 proven. 1980 refuted. 0 times theorem prover too weak. 3788 trivial. 0 not checked. [2020-07-21 11:52:31,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:52:43,006 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4138 proven. 1980 refuted. 0 times theorem prover too weak. 3962 trivial. 0 not checked. [2020-07-21 11:52:43,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [397103628] [2020-07-21 11:52:43,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:52:43,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92] total 137 [2020-07-21 11:52:43,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881547395] [2020-07-21 11:52:43,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 137 states [2020-07-21 11:52:43,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:52:43,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2020-07-21 11:52:43,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4276, Invalid=14356, Unknown=0, NotChecked=0, Total=18632 [2020-07-21 11:52:43,010 INFO L87 Difference]: Start difference. First operand 380 states and 405 transitions. Second operand 137 states. [2020-07-21 11:52:56,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:52:56,071 INFO L93 Difference]: Finished difference Result 755 states and 915 transitions. [2020-07-21 11:52:56,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2020-07-21 11:52:56,072 INFO L78 Accepts]: Start accepts. Automaton has 137 states. Word has length 465 [2020-07-21 11:52:56,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:52:56,074 INFO L225 Difference]: With dead ends: 755 [2020-07-21 11:52:56,074 INFO L226 Difference]: Without dead ends: 562 [2020-07-21 11:52:56,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 974 GetRequests, 749 SyntacticMatches, 45 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8866 ImplicationChecksByTransitivity, 25.9s TimeCoverageRelationStatistics Valid=8461, Invalid=24481, Unknown=0, NotChecked=0, Total=32942 [2020-07-21 11:52:56,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2020-07-21 11:52:56,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 382. [2020-07-21 11:52:56,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 382 states. [2020-07-21 11:52:56,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 407 transitions. [2020-07-21 11:52:56,093 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 407 transitions. Word has length 465 [2020-07-21 11:52:56,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:52:56,094 INFO L479 AbstractCegarLoop]: Abstraction has 382 states and 407 transitions. [2020-07-21 11:52:56,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 137 states. [2020-07-21 11:52:56,094 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 407 transitions. [2020-07-21 11:52:56,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-21 11:52:56,098 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:52:56,098 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 45, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:52:56,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:52:56,313 INFO L427 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:52:56,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:52:56,314 INFO L82 PathProgramCache]: Analyzing trace with hash -103324675, now seen corresponding path program 67 times [2020-07-21 11:52:56,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:52:56,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [692420460] [2020-07-21 11:52:56,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:52:56,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:52:56,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 1258 conjuncts, 94 conjunts are in the unsatisfiable core [2020-07-21 11:52:56,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:53:08,663 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 11:53:08,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:53:22,657 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 11:53:22,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [692420460] [2020-07-21 11:53:22,658 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:53:22,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94] total 140 [2020-07-21 11:53:22,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952107157] [2020-07-21 11:53:22,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2020-07-21 11:53:22,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:53:22,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2020-07-21 11:53:22,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4463, Invalid=14997, Unknown=0, NotChecked=0, Total=19460 [2020-07-21 11:53:22,661 INFO L87 Difference]: Start difference. First operand 382 states and 407 transitions. Second operand 140 states. [2020-07-21 11:53:38,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:53:38,211 INFO L93 Difference]: Finished difference Result 759 states and 922 transitions. [2020-07-21 11:53:38,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-21 11:53:38,211 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 467 [2020-07-21 11:53:38,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:53:38,213 INFO L225 Difference]: With dead ends: 759 [2020-07-21 11:53:38,214 INFO L226 Difference]: Without dead ends: 568 [2020-07-21 11:53:38,216 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 749 SyntacticMatches, 46 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9270 ImplicationChecksByTransitivity, 32.1s TimeCoverageRelationStatistics Valid=8833, Invalid=25577, Unknown=0, NotChecked=0, Total=34410 [2020-07-21 11:53:38,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2020-07-21 11:53:38,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 384. [2020-07-21 11:53:38,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 384 states. [2020-07-21 11:53:38,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 409 transitions. [2020-07-21 11:53:38,231 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 409 transitions. Word has length 467 [2020-07-21 11:53:38,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:53:38,232 INFO L479 AbstractCegarLoop]: Abstraction has 384 states and 409 transitions. [2020-07-21 11:53:38,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 140 states. [2020-07-21 11:53:38,232 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 409 transitions. [2020-07-21 11:53:38,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-07-21 11:53:38,234 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:53:38,234 INFO L422 BasicCegarLoop]: trace histogram [47, 46, 46, 46, 46, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:53:38,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:53:38,436 INFO L427 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:53:38,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:53:38,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1949894242, now seen corresponding path program 68 times [2020-07-21 11:53:38,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:53:38,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [943216399] [2020-07-21 11:53:38,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:53:38,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:53:38,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 1268 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-21 11:53:38,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:53:42,355 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:53:42,606 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 11:53:42,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:53:42,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:53:48,881 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 11:53:48,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [943216399] [2020-07-21 11:53:48,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:53:48,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51] total 52 [2020-07-21 11:53:48,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771247926] [2020-07-21 11:53:48,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-21 11:53:48,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:53:48,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-21 11:53:48,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1229, Invalid=1423, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 11:53:48,883 INFO L87 Difference]: Start difference. First operand 384 states and 409 transitions. Second operand 52 states. [2020-07-21 11:53:50,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:53:50,184 INFO L93 Difference]: Finished difference Result 403 states and 430 transitions. [2020-07-21 11:53:50,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-21 11:53:50,186 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 469 [2020-07-21 11:53:50,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:53:50,189 INFO L225 Difference]: With dead ends: 403 [2020-07-21 11:53:50,189 INFO L226 Difference]: Without dead ends: 401 [2020-07-21 11:53:50,190 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 938 GetRequests, 795 SyntacticMatches, 92 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2437 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=1233, Invalid=1523, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 11:53:50,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2020-07-21 11:53:50,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 396. [2020-07-21 11:53:50,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 396 states. [2020-07-21 11:53:50,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 422 transitions. [2020-07-21 11:53:50,204 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 422 transitions. Word has length 469 [2020-07-21 11:53:50,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:53:50,204 INFO L479 AbstractCegarLoop]: Abstraction has 396 states and 422 transitions. [2020-07-21 11:53:50,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-21 11:53:50,205 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 422 transitions. [2020-07-21 11:53:50,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-21 11:53:50,207 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:53:50,207 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 47, 47, 47, 47, 47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:53:50,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:53:50,408 INFO L427 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:53:50,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:53:50,409 INFO L82 PathProgramCache]: Analyzing trace with hash 676537412, now seen corresponding path program 69 times [2020-07-21 11:53:50,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:53:50,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1604725349] [2020-07-21 11:53:50,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:53:50,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:53:50,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 1302 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-21 11:53:50,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:54:00,169 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4692 proven. 2162 refuted. 0 times theorem prover too weak. 4144 trivial. 0 not checked. [2020-07-21 11:54:00,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:54:11,463 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4510 proven. 2162 refuted. 0 times theorem prover too weak. 4326 trivial. 0 not checked. [2020-07-21 11:54:11,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1604725349] [2020-07-21 11:54:11,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:54:11,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96] total 143 [2020-07-21 11:54:11,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120517448] [2020-07-21 11:54:11,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 143 states [2020-07-21 11:54:11,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:54:11,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2020-07-21 11:54:11,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4654, Invalid=15652, Unknown=0, NotChecked=0, Total=20306 [2020-07-21 11:54:11,467 INFO L87 Difference]: Start difference. First operand 396 states and 422 transitions. Second operand 143 states. [2020-07-21 11:54:22,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:54:22,631 INFO L93 Difference]: Finished difference Result 787 states and 954 transitions. [2020-07-21 11:54:22,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-21 11:54:22,631 INFO L78 Accepts]: Start accepts. Automaton has 143 states. Word has length 485 [2020-07-21 11:54:22,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:54:22,633 INFO L225 Difference]: With dead ends: 787 [2020-07-21 11:54:22,633 INFO L226 Difference]: Without dead ends: 586 [2020-07-21 11:54:22,635 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1016 GetRequests, 781 SyntacticMatches, 47 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9683 ImplicationChecksByTransitivity, 25.1s TimeCoverageRelationStatistics Valid=9213, Invalid=26697, Unknown=0, NotChecked=0, Total=35910 [2020-07-21 11:54:22,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-07-21 11:54:22,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 398. [2020-07-21 11:54:22,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 398 states. [2020-07-21 11:54:22,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 424 transitions. [2020-07-21 11:54:22,649 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 424 transitions. Word has length 485 [2020-07-21 11:54:22,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:54:22,650 INFO L479 AbstractCegarLoop]: Abstraction has 398 states and 424 transitions. [2020-07-21 11:54:22,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 143 states. [2020-07-21 11:54:22,650 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 424 transitions. [2020-07-21 11:54:22,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-21 11:54:22,652 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:54:22,652 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 48, 47, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:54:22,852 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:54:22,853 INFO L427 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:54:22,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:54:22,854 INFO L82 PathProgramCache]: Analyzing trace with hash 579393385, now seen corresponding path program 70 times [2020-07-21 11:54:22,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:54:22,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [247414766] [2020-07-21 11:54:22,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:54:23,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:54:23,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 1312 conjuncts, 98 conjunts are in the unsatisfiable core [2020-07-21 11:54:23,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:54:33,000 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 11:54:33,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:54:45,058 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 11:54:45,059 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [247414766] [2020-07-21 11:54:45,059 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:54:45,059 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98] total 146 [2020-07-21 11:54:45,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628229] [2020-07-21 11:54:45,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2020-07-21 11:54:45,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:54:45,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2020-07-21 11:54:45,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4849, Invalid=16321, Unknown=0, NotChecked=0, Total=21170 [2020-07-21 11:54:45,061 INFO L87 Difference]: Start difference. First operand 398 states and 424 transitions. Second operand 146 states. [2020-07-21 11:54:58,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:54:58,712 INFO L93 Difference]: Finished difference Result 791 states and 961 transitions. [2020-07-21 11:54:58,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2020-07-21 11:54:58,712 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 487 [2020-07-21 11:54:58,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:54:58,715 INFO L225 Difference]: With dead ends: 791 [2020-07-21 11:54:58,715 INFO L226 Difference]: Without dead ends: 592 [2020-07-21 11:54:58,717 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 781 SyntacticMatches, 48 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10105 ImplicationChecksByTransitivity, 27.0s TimeCoverageRelationStatistics Valid=9601, Invalid=27841, Unknown=0, NotChecked=0, Total=37442 [2020-07-21 11:54:58,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2020-07-21 11:54:58,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 400. [2020-07-21 11:54:58,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-21 11:54:58,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 426 transitions. [2020-07-21 11:54:58,740 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 426 transitions. Word has length 487 [2020-07-21 11:54:58,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:54:58,741 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 426 transitions. [2020-07-21 11:54:58,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 146 states. [2020-07-21 11:54:58,741 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 426 transitions. [2020-07-21 11:54:58,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-21 11:54:58,744 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:54:58,745 INFO L422 BasicCegarLoop]: trace histogram [49, 48, 48, 48, 48, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:54:58,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:54:58,958 INFO L427 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:54:58,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:54:58,959 INFO L82 PathProgramCache]: Analyzing trace with hash 1713263950, now seen corresponding path program 71 times [2020-07-21 11:54:58,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:54:58,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1331477380] [2020-07-21 11:54:58,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:54:59,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:54:59,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 1322 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-21 11:54:59,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:55:03,042 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:55:03,348 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 11:55:03,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:55:03,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:55:11,137 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 11:55:11,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1331477380] [2020-07-21 11:55:11,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:55:11,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 54 [2020-07-21 11:55:11,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721076955] [2020-07-21 11:55:11,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-07-21 11:55:11,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:55:11,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-07-21 11:55:11,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1330, Invalid=1532, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 11:55:11,139 INFO L87 Difference]: Start difference. First operand 400 states and 426 transitions. Second operand 54 states. [2020-07-21 11:55:12,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:55:12,712 INFO L93 Difference]: Finished difference Result 419 states and 447 transitions. [2020-07-21 11:55:12,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 11:55:12,714 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 489 [2020-07-21 11:55:12,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:55:12,717 INFO L225 Difference]: With dead ends: 419 [2020-07-21 11:55:12,717 INFO L226 Difference]: Without dead ends: 417 [2020-07-21 11:55:12,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 978 GetRequests, 829 SyntacticMatches, 96 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2639 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=1334, Invalid=1636, Unknown=0, NotChecked=0, Total=2970 [2020-07-21 11:55:12,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2020-07-21 11:55:12,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 412. [2020-07-21 11:55:12,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 412 states. [2020-07-21 11:55:12,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 439 transitions. [2020-07-21 11:55:12,740 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 439 transitions. Word has length 489 [2020-07-21 11:55:12,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:55:12,740 INFO L479 AbstractCegarLoop]: Abstraction has 412 states and 439 transitions. [2020-07-21 11:55:12,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-07-21 11:55:12,741 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 439 transitions. [2020-07-21 11:55:12,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-21 11:55:12,744 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:55:12,744 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 49, 49, 49, 49, 49, 49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:55:12,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:55:12,945 INFO L427 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:55:12,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:55:12,946 INFO L82 PathProgramCache]: Analyzing trace with hash -831186128, now seen corresponding path program 72 times [2020-07-21 11:55:12,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:55:12,946 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568969096] [2020-07-21 11:55:12,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:55:13,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:55:13,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 1356 conjuncts, 100 conjunts are in the unsatisfiable core [2020-07-21 11:55:13,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:55:24,857 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 5088 proven. 2352 refuted. 0 times theorem prover too weak. 4516 trivial. 0 not checked. [2020-07-21 11:55:24,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:55:39,044 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 4898 proven. 2352 refuted. 0 times theorem prover too weak. 4706 trivial. 0 not checked. [2020-07-21 11:55:39,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568969096] [2020-07-21 11:55:39,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:55:39,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100] total 149 [2020-07-21 11:55:39,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078846720] [2020-07-21 11:55:39,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 149 states [2020-07-21 11:55:39,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:55:39,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2020-07-21 11:55:39,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5048, Invalid=17004, Unknown=0, NotChecked=0, Total=22052 [2020-07-21 11:55:39,048 INFO L87 Difference]: Start difference. First operand 412 states and 439 transitions. Second operand 149 states. [2020-07-21 11:55:54,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:55:54,292 INFO L93 Difference]: Finished difference Result 819 states and 993 transitions. [2020-07-21 11:55:54,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-21 11:55:54,293 INFO L78 Accepts]: Start accepts. Automaton has 149 states. Word has length 505 [2020-07-21 11:55:54,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:55:54,295 INFO L225 Difference]: With dead ends: 819 [2020-07-21 11:55:54,295 INFO L226 Difference]: Without dead ends: 610 [2020-07-21 11:55:54,298 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1058 GetRequests, 813 SyntacticMatches, 49 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10536 ImplicationChecksByTransitivity, 31.7s TimeCoverageRelationStatistics Valid=9997, Invalid=29009, Unknown=0, NotChecked=0, Total=39006 [2020-07-21 11:55:54,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2020-07-21 11:55:54,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 414. [2020-07-21 11:55:54,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2020-07-21 11:55:54,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 441 transitions. [2020-07-21 11:55:54,315 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 441 transitions. Word has length 505 [2020-07-21 11:55:54,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:55:54,316 INFO L479 AbstractCegarLoop]: Abstraction has 414 states and 441 transitions. [2020-07-21 11:55:54,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 149 states. [2020-07-21 11:55:54,316 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 441 transitions. [2020-07-21 11:55:54,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 11:55:54,319 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:55:54,319 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 50, 49, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:55:54,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:55:54,520 INFO L427 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:55:54,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:55:54,521 INFO L82 PathProgramCache]: Analyzing trace with hash 1643039189, now seen corresponding path program 73 times [2020-07-21 11:55:54,521 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:55:54,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1342089756] [2020-07-21 11:55:54,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:55:54,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:55:54,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 1366 conjuncts, 102 conjunts are in the unsatisfiable core [2020-07-21 11:55:54,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:56:08,044 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 11:56:08,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:56:24,282 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 11:56:24,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1342089756] [2020-07-21 11:56:24,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:56:24,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102] total 152 [2020-07-21 11:56:24,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288767007] [2020-07-21 11:56:24,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2020-07-21 11:56:24,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:56:24,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2020-07-21 11:56:24,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5251, Invalid=17701, Unknown=0, NotChecked=0, Total=22952 [2020-07-21 11:56:24,285 INFO L87 Difference]: Start difference. First operand 414 states and 441 transitions. Second operand 152 states. [2020-07-21 11:56:43,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:56:43,208 INFO L93 Difference]: Finished difference Result 823 states and 1000 transitions. [2020-07-21 11:56:43,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2020-07-21 11:56:43,209 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 507 [2020-07-21 11:56:43,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:56:43,212 INFO L225 Difference]: With dead ends: 823 [2020-07-21 11:56:43,212 INFO L226 Difference]: Without dead ends: 616 [2020-07-21 11:56:43,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1063 GetRequests, 813 SyntacticMatches, 50 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10976 ImplicationChecksByTransitivity, 36.4s TimeCoverageRelationStatistics Valid=10401, Invalid=30201, Unknown=0, NotChecked=0, Total=40602 [2020-07-21 11:56:43,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2020-07-21 11:56:43,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 416. [2020-07-21 11:56:43,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 416 states. [2020-07-21 11:56:43,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 443 transitions. [2020-07-21 11:56:43,240 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 443 transitions. Word has length 507 [2020-07-21 11:56:43,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:56:43,240 INFO L479 AbstractCegarLoop]: Abstraction has 416 states and 443 transitions. [2020-07-21 11:56:43,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 152 states. [2020-07-21 11:56:43,240 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 443 transitions. [2020-07-21 11:56:43,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 510 [2020-07-21 11:56:43,243 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:56:43,243 INFO L422 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 50, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:56:43,443 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:56:43,444 INFO L427 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:56:43,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:56:43,445 INFO L82 PathProgramCache]: Analyzing trace with hash -38313158, now seen corresponding path program 74 times [2020-07-21 11:56:43,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:56:43,445 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [247748960] [2020-07-21 11:56:43,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:56:43,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:56:43,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 1376 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-21 11:56:43,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:56:48,686 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 11:56:49,031 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 11:56:49,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:56:49,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:56:59,799 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 11:56:59,800 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [247748960] [2020-07-21 11:56:59,800 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:56:59,800 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55] total 56 [2020-07-21 11:56:59,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69302306] [2020-07-21 11:56:59,801 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-21 11:56:59,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:56:59,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-21 11:56:59,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1435, Invalid=1645, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 11:56:59,802 INFO L87 Difference]: Start difference. First operand 416 states and 443 transitions. Second operand 56 states. [2020-07-21 11:57:02,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:57:02,149 INFO L93 Difference]: Finished difference Result 435 states and 464 transitions. [2020-07-21 11:57:02,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-21 11:57:02,154 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 509 [2020-07-21 11:57:02,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:57:02,157 INFO L225 Difference]: With dead ends: 435 [2020-07-21 11:57:02,157 INFO L226 Difference]: Without dead ends: 433 [2020-07-21 11:57:02,158 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1018 GetRequests, 863 SyntacticMatches, 100 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2849 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=1439, Invalid=1753, Unknown=0, NotChecked=0, Total=3192 [2020-07-21 11:57:02,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2020-07-21 11:57:02,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 428. [2020-07-21 11:57:02,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 428 states. [2020-07-21 11:57:02,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 456 transitions. [2020-07-21 11:57:02,181 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 456 transitions. Word has length 509 [2020-07-21 11:57:02,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:57:02,182 INFO L479 AbstractCegarLoop]: Abstraction has 428 states and 456 transitions. [2020-07-21 11:57:02,182 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-21 11:57:02,182 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 456 transitions. [2020-07-21 11:57:02,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 526 [2020-07-21 11:57:02,184 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:57:02,185 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 52, 51, 51, 51, 51, 51, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:57:02,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:57:02,386 INFO L427 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:57:02,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:57:02,387 INFO L82 PathProgramCache]: Analyzing trace with hash 283955484, now seen corresponding path program 75 times [2020-07-21 11:57:02,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:57:02,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [790283273] [2020-07-21 11:57:02,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:57:02,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:57:02,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 1410 conjuncts, 104 conjunts are in the unsatisfiable core [2020-07-21 11:57:02,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:57:19,392 INFO L134 CoverageAnalysis]: Checked inductivity of 12954 backedges. 5500 proven. 2550 refuted. 0 times theorem prover too weak. 4904 trivial. 0 not checked. [2020-07-21 11:57:19,393 INFO L328 TraceCheckSpWp]: Computing backward predicates...