/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005_variant.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:58:20,849 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:58:20,851 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:58:20,870 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:58:20,870 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:58:20,872 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:58:20,874 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:58:20,884 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:58:20,889 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:58:20,892 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:58:20,893 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:58:20,894 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:58:20,894 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:58:20,896 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:58:20,898 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:58:20,900 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:58:20,901 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:58:20,902 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:58:20,903 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:58:20,908 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:58:20,912 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:58:20,916 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:58:20,917 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:58:20,917 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:58:20,920 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:58:20,928 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:58:20,929 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:58:20,930 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:58:20,931 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:58:20,962 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:58:20,971 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:58:20,972 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:58:20,972 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:58:20,972 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:58:20,973 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:58:20,973 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:58:20,973 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:58:20,973 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:58:20,973 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:58:20,974 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:58:20,974 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:58:20,974 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:58:20,974 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:58:20,974 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:58:20,974 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:58:20,975 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:58:20,975 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:58:20,975 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:58:20,976 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:58:20,976 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:58:20,977 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:58:20,977 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:58:20,977 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:58:20,977 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:58:20,977 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:58:20,978 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:20,978 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:58:20,978 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:58:20,978 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:58:21,253 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:58:21,272 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:58:21,275 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:58:21,277 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:58:21,279 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:58:21,281 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005_variant.i [2020-07-21 16:58:21,359 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9ecc9e8ac/cd7351ed9bfe4de7b3f1f4f51efeefcf/FLAG84fc3e97b [2020-07-21 16:58:21,838 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:58:21,840 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/cggmp2005_variant.i [2020-07-21 16:58:21,847 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9ecc9e8ac/cd7351ed9bfe4de7b3f1f4f51efeefcf/FLAG84fc3e97b [2020-07-21 16:58:22,238 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9ecc9e8ac/cd7351ed9bfe4de7b3f1f4f51efeefcf [2020-07-21 16:58:22,250 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:58:22,253 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:58:22,255 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:58:22,255 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:58:22,260 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:58:22,261 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:58:22" (1/1) ... [2020-07-21 16:58:22,264 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b3bb6a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:22, skipping insertion in model container [2020-07-21 16:58:22,264 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:58:22" (1/1) ... [2020-07-21 16:58:22,273 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:58:22,290 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:58:22,462 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:58:22,467 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:58:22,484 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:58:22,498 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:58:22,499 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:22 WrapperNode [2020-07-21 16:58:22,499 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:58:22,500 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:58:22,500 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:58:22,500 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:58:22,510 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:22" (1/1) ... [2020-07-21 16:58:22,511 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:22" (1/1) ... [2020-07-21 16:58:22,516 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:22" (1/1) ... [2020-07-21 16:58:22,517 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:22" (1/1) ... [2020-07-21 16:58:22,521 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:22" (1/1) ... [2020-07-21 16:58:22,526 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:22" (1/1) ... [2020-07-21 16:58:22,527 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:22" (1/1) ... [2020-07-21 16:58:22,616 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:58:22,617 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:58:22,617 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:58:22,618 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:58:22,625 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:22" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:58:22,681 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:58:22,681 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:58:22,681 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 16:58:22,681 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 16:58:22,682 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:58:22,682 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:58:22,682 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 16:58:22,682 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 16:58:22,682 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 16:58:22,682 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:58:22,683 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:58:22,683 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:58:22,683 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:58:22,882 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:58:22,882 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 16:58:22,887 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:58:22 BoogieIcfgContainer [2020-07-21 16:58:22,887 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:58:22,889 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:58:22,889 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:58:22,893 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:58:22,893 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:58:22" (1/3) ... [2020-07-21 16:58:22,895 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53abd3a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:58:22, skipping insertion in model container [2020-07-21 16:58:22,895 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:58:22" (2/3) ... [2020-07-21 16:58:22,895 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53abd3a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:58:22, skipping insertion in model container [2020-07-21 16:58:22,896 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:58:22" (3/3) ... [2020-07-21 16:58:22,899 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005_variant.i [2020-07-21 16:58:22,912 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:58:22,921 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:58:22,939 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:58:22,974 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:58:22,974 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:58:22,974 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:58:22,974 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:58:22,975 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:58:22,975 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:58:22,975 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:58:22,975 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:58:23,001 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-07-21 16:58:23,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-21 16:58:23,010 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:23,012 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:23,012 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:23,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:23,022 INFO L82 PathProgramCache]: Analyzing trace with hash 1608903343, now seen corresponding path program 1 times [2020-07-21 16:58:23,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:23,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [421234955] [2020-07-21 16:58:23,033 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:23,118 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:23,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:23,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 16:58:23,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:23,170 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:58:23,170 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:58:23,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [421234955] [2020-07-21 16:58:23,172 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:58:23,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:58:23,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474829684] [2020-07-21 16:58:23,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:58:23,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:23,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:58:23,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:58:23,194 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-07-21 16:58:23,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:23,235 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2020-07-21 16:58:23,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:58:23,237 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-07-21 16:58:23,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:23,244 INFO L225 Difference]: With dead ends: 32 [2020-07-21 16:58:23,244 INFO L226 Difference]: Without dead ends: 13 [2020-07-21 16:58:23,248 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:58:23,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-07-21 16:58:23,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-07-21 16:58:23,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-07-21 16:58:23,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-07-21 16:58:23,286 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-07-21 16:58:23,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:23,286 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-07-21 16:58:23,287 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:58:23,287 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-07-21 16:58:23,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 16:58:23,288 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:23,288 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:23,502 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:23,502 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:23,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:23,504 INFO L82 PathProgramCache]: Analyzing trace with hash -1628066164, now seen corresponding path program 1 times [2020-07-21 16:58:23,504 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:23,505 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574416720] [2020-07-21 16:58:23,505 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:23,540 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:23,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:23,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:58:23,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:23,678 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 16:58:23,733 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:58:23,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:23,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:58:23,900 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:58:23,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574416720] [2020-07-21 16:58:23,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:23,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2020-07-21 16:58:23,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496692246] [2020-07-21 16:58:23,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:58:23,904 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:23,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:58:23,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:58:23,906 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 12 states. [2020-07-21 16:58:24,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:24,131 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2020-07-21 16:58:24,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:58:24,132 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 12 [2020-07-21 16:58:24,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:24,133 INFO L225 Difference]: With dead ends: 21 [2020-07-21 16:58:24,133 INFO L226 Difference]: Without dead ends: 15 [2020-07-21 16:58:24,134 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:58:24,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-21 16:58:24,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-21 16:58:24,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-21 16:58:24,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-21 16:58:24,141 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-07-21 16:58:24,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:24,141 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-21 16:58:24,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:58:24,142 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-21 16:58:24,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 16:58:24,143 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:24,143 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:24,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:24,358 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:24,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:24,359 INFO L82 PathProgramCache]: Analyzing trace with hash -66279700, now seen corresponding path program 2 times [2020-07-21 16:58:24,359 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:24,360 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2140279621] [2020-07-21 16:58:24,360 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:24,409 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:24,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:24,411 WARN L261 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 16:58:24,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:24,522 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 16:58:24,557 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:58:24,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:24,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:58:24,712 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:58:24,713 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2140279621] [2020-07-21 16:58:24,713 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:24,713 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2020-07-21 16:58:24,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470523010] [2020-07-21 16:58:24,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 16:58:24,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:24,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 16:58:24,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:58:24,716 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 15 states. [2020-07-21 16:58:25,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:25,139 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2020-07-21 16:58:25,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 16:58:25,139 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 14 [2020-07-21 16:58:25,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:25,140 INFO L225 Difference]: With dead ends: 25 [2020-07-21 16:58:25,140 INFO L226 Difference]: Without dead ends: 19 [2020-07-21 16:58:25,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:58:25,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-07-21 16:58:25,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-07-21 16:58:25,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-07-21 16:58:25,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-07-21 16:58:25,148 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 14 [2020-07-21 16:58:25,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:25,149 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-07-21 16:58:25,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 16:58:25,149 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-07-21 16:58:25,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 16:58:25,150 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:25,150 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:25,364 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:25,365 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:25,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:25,366 INFO L82 PathProgramCache]: Analyzing trace with hash -43331668, now seen corresponding path program 3 times [2020-07-21 16:58:25,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:25,367 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [600862682] [2020-07-21 16:58:25,368 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:25,418 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:25,419 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:25,421 WARN L261 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 50 conjunts are in the unsatisfiable core [2020-07-21 16:58:25,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:25,600 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 16:58:25,662 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:58:25,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:25,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:58:25,985 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:58:25,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [600862682] [2020-07-21 16:58:25,986 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:25,986 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2020-07-21 16:58:25,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948185868] [2020-07-21 16:58:25,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:58:25,987 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:25,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:58:25,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:58:25,988 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 23 states. [2020-07-21 16:58:27,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:27,088 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2020-07-21 16:58:27,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 16:58:27,089 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 18 [2020-07-21 16:58:27,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:27,090 INFO L225 Difference]: With dead ends: 33 [2020-07-21 16:58:27,090 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 16:58:27,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=356, Invalid=1284, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 16:58:27,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 16:58:27,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 16:58:27,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 16:58:27,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-07-21 16:58:27,101 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 18 [2020-07-21 16:58:27,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:27,101 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-07-21 16:58:27,101 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:58:27,101 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-07-21 16:58:27,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 16:58:27,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:27,103 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:27,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:27,316 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:27,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:27,317 INFO L82 PathProgramCache]: Analyzing trace with hash 101712172, now seen corresponding path program 4 times [2020-07-21 16:58:27,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:27,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [545101353] [2020-07-21 16:58:27,319 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:27,361 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:27,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:27,364 WARN L261 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 98 conjunts are in the unsatisfiable core [2020-07-21 16:58:27,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:27,718 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 16:58:27,786 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:58:27,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:27,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:58:28,802 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:58:28,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [545101353] [2020-07-21 16:58:28,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:28,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 40 [2020-07-21 16:58:28,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816849809] [2020-07-21 16:58:28,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-21 16:58:28,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:28,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-21 16:58:28,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=1250, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:58:28,806 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 40 states. [2020-07-21 16:58:29,701 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2020-07-21 16:58:29,968 WARN L193 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 76 [2020-07-21 16:58:30,175 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-21 16:58:30,385 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 66 [2020-07-21 16:58:32,527 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2020-07-21 16:58:32,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:32,541 INFO L93 Difference]: Finished difference Result 49 states and 64 transitions. [2020-07-21 16:58:32,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-07-21 16:58:32,541 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 26 [2020-07-21 16:58:32,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:32,543 INFO L225 Difference]: With dead ends: 49 [2020-07-21 16:58:32,543 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 16:58:32,547 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 721 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=1203, Invalid=4199, Unknown=0, NotChecked=0, Total=5402 [2020-07-21 16:58:32,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 16:58:32,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-07-21 16:58:32,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-21 16:58:32,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-07-21 16:58:32,559 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 26 [2020-07-21 16:58:32,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:32,560 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-07-21 16:58:32,560 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-21 16:58:32,560 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-07-21 16:58:32,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-21 16:58:32,562 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:32,562 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:32,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:32,778 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:32,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:32,779 INFO L82 PathProgramCache]: Analyzing trace with hash -868359124, now seen corresponding path program 5 times [2020-07-21 16:58:32,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:32,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [743315118] [2020-07-21 16:58:32,781 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:32,841 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:32,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:32,850 WARN L261 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 194 conjunts are in the unsatisfiable core [2020-07-21 16:58:32,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:33,940 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 16:58:34,077 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:58:34,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:34,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:58:37,380 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:58:37,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [743315118] [2020-07-21 16:58:37,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:37,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 72 [2020-07-21 16:58:37,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212824627] [2020-07-21 16:58:37,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 72 states [2020-07-21 16:58:37,390 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:37,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2020-07-21 16:58:37,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1110, Invalid=4002, Unknown=0, NotChecked=0, Total=5112 [2020-07-21 16:58:37,396 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 72 states. [2020-07-21 16:58:40,153 WARN L193 SmtUtils]: Spent 310.00 ms on a formula simplification that was a NOOP. DAG size: 217 [2020-07-21 16:58:40,799 WARN L193 SmtUtils]: Spent 495.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 140 [2020-07-21 16:58:41,387 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 203 [2020-07-21 16:58:41,919 WARN L193 SmtUtils]: Spent 417.00 ms on a formula simplification. DAG size of input: 208 DAG size of output: 130 [2020-07-21 16:58:42,453 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 197 [2020-07-21 16:58:43,071 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification that was a NOOP. DAG size: 190 [2020-07-21 16:58:43,602 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-21 16:58:44,119 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 177 [2020-07-21 16:58:44,630 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 171 [2020-07-21 16:58:45,125 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2020-07-21 16:58:45,610 WARN L193 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2020-07-21 16:58:46,083 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 151 [2020-07-21 16:58:46,547 WARN L193 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 145 [2020-07-21 16:58:46,990 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2020-07-21 16:58:47,415 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2020-07-21 16:58:47,838 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2020-07-21 16:58:48,272 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2020-07-21 16:58:48,668 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 16:58:49,045 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-21 16:58:49,429 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-21 16:58:49,781 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-21 16:58:53,661 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 207 [2020-07-21 16:58:53,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:53,672 INFO L93 Difference]: Finished difference Result 81 states and 112 transitions. [2020-07-21 16:58:53,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2020-07-21 16:58:53,672 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 42 [2020-07-21 16:58:53,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:53,674 INFO L225 Difference]: With dead ends: 81 [2020-07-21 16:58:53,675 INFO L226 Difference]: Without dead ends: 75 [2020-07-21 16:58:53,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2465 ImplicationChecksByTransitivity, 18.9s TimeCoverageRelationStatistics Valid=4419, Invalid=14487, Unknown=0, NotChecked=0, Total=18906 [2020-07-21 16:58:53,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-21 16:58:53,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-07-21 16:58:53,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-21 16:58:53,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-07-21 16:58:53,703 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 42 [2020-07-21 16:58:53,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:53,704 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-07-21 16:58:53,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 72 states. [2020-07-21 16:58:53,704 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-07-21 16:58:53,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-07-21 16:58:53,706 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:53,706 INFO L422 BasicCegarLoop]: trace histogram [63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:53,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:53,916 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:53,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:53,917 INFO L82 PathProgramCache]: Analyzing trace with hash 1445440044, now seen corresponding path program 6 times [2020-07-21 16:58:53,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:53,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1121582519] [2020-07-21 16:58:53,919 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:54,018 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:54,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:54,028 WARN L261 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 386 conjunts are in the unsatisfiable core [2020-07-21 16:58:54,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:57,954 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 16:58:58,188 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:58:58,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:58,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:59:11,115 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:59:11,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1121582519] [2020-07-21 16:59:11,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:59:11,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70] total 135 [2020-07-21 16:59:11,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176415368] [2020-07-21 16:59:11,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 135 states [2020-07-21 16:59:11,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:59:11,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2020-07-21 16:59:11,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4241, Invalid=13849, Unknown=0, NotChecked=0, Total=18090 [2020-07-21 16:59:11,123 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 135 states. [2020-07-21 16:59:21,458 WARN L193 SmtUtils]: Spent 922.00 ms on a formula simplification that was a NOOP. DAG size: 427 [2020-07-21 16:59:23,174 WARN L193 SmtUtils]: Spent 1.28 s on a formula simplification. DAG size of input: 428 DAG size of output: 270 [2020-07-21 16:59:25,639 WARN L193 SmtUtils]: Spent 857.00 ms on a formula simplification that was a NOOP. DAG size: 411 [2020-07-21 16:59:27,146 WARN L193 SmtUtils]: Spent 1.19 s on a formula simplification. DAG size of input: 416 DAG size of output: 258 [2020-07-21 16:59:29,535 WARN L193 SmtUtils]: Spent 830.00 ms on a formula simplification that was a NOOP. DAG size: 405 [2020-07-21 16:59:32,237 WARN L193 SmtUtils]: Spent 877.00 ms on a formula simplification that was a NOOP. DAG size: 398 [2020-07-21 16:59:34,737 WARN L193 SmtUtils]: Spent 858.00 ms on a formula simplification that was a NOOP. DAG size: 392 [2020-07-21 16:59:37,166 WARN L193 SmtUtils]: Spent 810.00 ms on a formula simplification that was a NOOP. DAG size: 385 [2020-07-21 16:59:39,478 WARN L193 SmtUtils]: Spent 764.00 ms on a formula simplification that was a NOOP. DAG size: 379 [2020-07-21 16:59:41,821 WARN L193 SmtUtils]: Spent 761.00 ms on a formula simplification that was a NOOP. DAG size: 372 [2020-07-21 16:59:44,138 WARN L193 SmtUtils]: Spent 730.00 ms on a formula simplification that was a NOOP. DAG size: 366 [2020-07-21 16:59:46,418 WARN L193 SmtUtils]: Spent 693.00 ms on a formula simplification that was a NOOP. DAG size: 359 [2020-07-21 16:59:48,718 WARN L193 SmtUtils]: Spent 740.00 ms on a formula simplification that was a NOOP. DAG size: 353 [2020-07-21 16:59:51,024 WARN L193 SmtUtils]: Spent 733.00 ms on a formula simplification that was a NOOP. DAG size: 346 [2020-07-21 16:59:53,303 WARN L193 SmtUtils]: Spent 737.00 ms on a formula simplification that was a NOOP. DAG size: 340 [2020-07-21 16:59:55,659 WARN L193 SmtUtils]: Spent 759.00 ms on a formula simplification that was a NOOP. DAG size: 333 [2020-07-21 16:59:57,937 WARN L193 SmtUtils]: Spent 699.00 ms on a formula simplification that was a NOOP. DAG size: 327 [2020-07-21 17:00:00,147 WARN L193 SmtUtils]: Spent 629.00 ms on a formula simplification that was a NOOP. DAG size: 320 [2020-07-21 17:00:02,301 WARN L193 SmtUtils]: Spent 620.00 ms on a formula simplification that was a NOOP. DAG size: 314 [2020-07-21 17:00:04,446 WARN L193 SmtUtils]: Spent 625.00 ms on a formula simplification that was a NOOP. DAG size: 307 [2020-07-21 17:00:06,530 WARN L193 SmtUtils]: Spent 586.00 ms on a formula simplification that was a NOOP. DAG size: 301 [2020-07-21 17:00:08,567 WARN L193 SmtUtils]: Spent 550.00 ms on a formula simplification that was a NOOP. DAG size: 294 [2020-07-21 17:00:10,574 WARN L193 SmtUtils]: Spent 531.00 ms on a formula simplification that was a NOOP. DAG size: 288 [2020-07-21 17:00:12,718 WARN L193 SmtUtils]: Spent 598.00 ms on a formula simplification that was a NOOP. DAG size: 281 [2020-07-21 17:00:14,752 WARN L193 SmtUtils]: Spent 538.00 ms on a formula simplification that was a NOOP. DAG size: 275 [2020-07-21 17:00:16,760 WARN L193 SmtUtils]: Spent 507.00 ms on a formula simplification that was a NOOP. DAG size: 268 [2020-07-21 17:00:18,743 WARN L193 SmtUtils]: Spent 523.00 ms on a formula simplification that was a NOOP. DAG size: 262 [2020-07-21 17:00:20,823 WARN L193 SmtUtils]: Spent 559.00 ms on a formula simplification that was a NOOP. DAG size: 255 [2020-07-21 17:00:22,817 WARN L193 SmtUtils]: Spent 545.00 ms on a formula simplification that was a NOOP. DAG size: 249 [2020-07-21 17:00:24,762 WARN L193 SmtUtils]: Spent 493.00 ms on a formula simplification that was a NOOP. DAG size: 242 [2020-07-21 17:00:26,652 WARN L193 SmtUtils]: Spent 457.00 ms on a formula simplification that was a NOOP. DAG size: 236 [2020-07-21 17:00:28,562 WARN L193 SmtUtils]: Spent 484.00 ms on a formula simplification that was a NOOP. DAG size: 229 [2020-07-21 17:00:30,467 WARN L193 SmtUtils]: Spent 462.00 ms on a formula simplification that was a NOOP. DAG size: 223 [2020-07-21 17:00:32,371 WARN L193 SmtUtils]: Spent 480.00 ms on a formula simplification that was a NOOP. DAG size: 216 [2020-07-21 17:00:34,267 WARN L193 SmtUtils]: Spent 463.00 ms on a formula simplification that was a NOOP. DAG size: 210 [2020-07-21 17:00:36,140 WARN L193 SmtUtils]: Spent 445.00 ms on a formula simplification that was a NOOP. DAG size: 203 [2020-07-21 17:00:37,977 WARN L193 SmtUtils]: Spent 440.00 ms on a formula simplification that was a NOOP. DAG size: 197 [2020-07-21 17:00:39,771 WARN L193 SmtUtils]: Spent 404.00 ms on a formula simplification that was a NOOP. DAG size: 190 [2020-07-21 17:00:41,569 WARN L193 SmtUtils]: Spent 405.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-21 17:00:43,336 WARN L193 SmtUtils]: Spent 404.00 ms on a formula simplification that was a NOOP. DAG size: 177 [2020-07-21 17:00:45,097 WARN L193 SmtUtils]: Spent 397.00 ms on a formula simplification that was a NOOP. DAG size: 171 [2020-07-21 17:00:46,783 WARN L193 SmtUtils]: Spent 355.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2020-07-21 17:00:48,460 WARN L193 SmtUtils]: Spent 346.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2020-07-21 17:00:50,127 WARN L193 SmtUtils]: Spent 342.00 ms on a formula simplification that was a NOOP. DAG size: 151 [2020-07-21 17:00:51,804 WARN L193 SmtUtils]: Spent 334.00 ms on a formula simplification that was a NOOP. DAG size: 145 [2020-07-21 17:00:53,391 WARN L193 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2020-07-21 17:00:54,957 WARN L193 SmtUtils]: Spent 307.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2020-07-21 17:00:56,492 WARN L193 SmtUtils]: Spent 309.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2020-07-21 17:00:57,915 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2020-07-21 17:00:59,333 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 17:01:00,677 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-21 17:01:02,005 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-21 17:01:03,350 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-21 17:01:04,571 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-21 17:01:05,756 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-07-21 17:01:06,872 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-21 17:01:07,944 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 17:01:08,972 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 17:01:09,940 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 17:01:10,853 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 17:01:20,029 WARN L193 SmtUtils]: Spent 1.46 s on a formula simplification that was a NOOP. DAG size: 415 [2020-07-21 17:01:20,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:01:20,055 INFO L93 Difference]: Finished difference Result 145 states and 208 transitions. [2020-07-21 17:01:20,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2020-07-21 17:01:20,058 INFO L78 Accepts]: Start accepts. Automaton has 135 states. Word has length 74 [2020-07-21 17:01:20,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:01:20,060 INFO L225 Difference]: With dead ends: 145 [2020-07-21 17:01:20,060 INFO L226 Difference]: Without dead ends: 139 [2020-07-21 17:01:20,068 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8959 ImplicationChecksByTransitivity, 139.2s TimeCoverageRelationStatistics Valid=16988, Invalid=52972, Unknown=0, NotChecked=0, Total=69960 [2020-07-21 17:01:20,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2020-07-21 17:01:20,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2020-07-21 17:01:20,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2020-07-21 17:01:20,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 139 transitions. [2020-07-21 17:01:20,119 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 139 transitions. Word has length 74 [2020-07-21 17:01:20,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:01:20,120 INFO L479 AbstractCegarLoop]: Abstraction has 139 states and 139 transitions. [2020-07-21 17:01:20,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 135 states. [2020-07-21 17:01:20,120 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 139 transitions. [2020-07-21 17:01:20,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2020-07-21 17:01:20,126 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:01:20,126 INFO L422 BasicCegarLoop]: trace histogram [127, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:01:20,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:20,332 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:01:20,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:01:20,333 INFO L82 PathProgramCache]: Analyzing trace with hash -1338821076, now seen corresponding path program 7 times [2020-07-21 17:01:20,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:01:20,334 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [929995725] [2020-07-21 17:01:20,334 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:20,536 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:01:20,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:01:20,567 WARN L261 TraceCheckSpWp]: Trace formula consists of 919 conjuncts, 770 conjunts are in the unsatisfiable core [2020-07-21 17:01:20,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:01:51,457 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 17:01:52,568 INFO L134 CoverageAnalysis]: Checked inductivity of 8128 backedges. 0 proven. 8128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:01:52,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:01:53,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 17:04:07,341 INFO L134 CoverageAnalysis]: Checked inductivity of 8128 backedges. 0 proven. 8128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 17:04:07,341 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [929995725] [2020-07-21 17:04:07,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:04:07,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [134, 134] total 263 [2020-07-21 17:04:07,342 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999520165] [2020-07-21 17:04:07,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 263 states [2020-07-21 17:04:07,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:04:07,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 263 interpolants. [2020-07-21 17:04:07,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16657, Invalid=52249, Unknown=0, NotChecked=0, Total=68906 [2020-07-21 17:04:07,353 INFO L87 Difference]: Start difference. First operand 139 states and 139 transitions. Second operand 263 states. [2020-07-21 17:07:00,097 WARN L193 SmtUtils]: Spent 8.69 s on a formula simplification that was a NOOP. DAG size: 843 [2020-07-21 17:07:11,702 WARN L193 SmtUtils]: Spent 9.13 s on a formula simplification. DAG size of input: 844 DAG size of output: 526 [2020-07-21 17:08:12,909 WARN L193 SmtUtils]: Spent 7.78 s on a formula simplification that was a NOOP. DAG size: 827 [2020-07-21 17:08:23,222 WARN L193 SmtUtils]: Spent 8.70 s on a formula simplification. DAG size of input: 832 DAG size of output: 514 [2020-07-21 17:09:23,944 WARN L193 SmtUtils]: Spent 8.18 s on a formula simplification that was a NOOP. DAG size: 821 [2020-07-21 17:10:33,102 WARN L193 SmtUtils]: Spent 8.94 s on a formula simplification that was a NOOP. DAG size: 814 [2020-07-21 17:11:42,776 WARN L193 SmtUtils]: Spent 8.54 s on a formula simplification that was a NOOP. DAG size: 808