/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/loops/lu.cmp.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:43:31,467 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:43:31,470 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:43:31,487 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:43:31,488 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:43:31,490 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:43:31,492 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:43:31,504 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:43:31,506 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:43:31,507 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:43:31,508 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:43:31,510 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:43:31,510 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:43:31,513 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:43:31,515 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:43:31,517 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:43:31,519 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:43:31,521 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:43:31,523 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:43:31,529 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:43:31,533 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:43:31,533 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:43:31,535 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:43:31,536 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:43:31,538 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:43:31,545 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:43:31,545 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:43:31,546 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:43:31,547 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 16:43:31,560 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:43:31,560 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:43:31,561 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:43:31,562 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:43:31,562 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:43:31,562 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:43:31,562 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:43:31,563 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:43:31,563 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:43:31,563 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:43:31,563 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:43:31,563 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:43:31,564 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:43:31,564 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:43:31,564 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:43:31,564 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:43:31,564 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:43:31,565 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:43:31,565 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:43:31,565 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:43:31,565 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:43:31,565 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:43:31,566 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:43:31,566 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:43:31,566 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:43:31,566 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:43:31,566 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:31,567 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:43:31,567 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:43:31,567 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 16:43:31,874 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:43:31,887 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:43:31,890 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:43:31,891 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:43:31,892 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:43:31,892 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/lu.cmp.c [2020-07-21 16:43:31,951 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e7fb83bdd/3b6370b7a64f4f5bb124535ad6d91484/FLAG67670f7a5 [2020-07-21 16:43:32,379 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:43:32,380 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/lu.cmp.c [2020-07-21 16:43:32,388 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e7fb83bdd/3b6370b7a64f4f5bb124535ad6d91484/FLAG67670f7a5 [2020-07-21 16:43:32,766 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e7fb83bdd/3b6370b7a64f4f5bb124535ad6d91484 [2020-07-21 16:43:32,776 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:43:32,778 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:43:32,779 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:43:32,780 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:43:32,783 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:43:32,784 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:43:32" (1/1) ... [2020-07-21 16:43:32,787 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@793f9d50 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:32, skipping insertion in model container [2020-07-21 16:43:32,787 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:43:32" (1/1) ... [2020-07-21 16:43:32,794 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:43:32,816 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:43:33,020 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:43:33,026 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:43:33,159 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:43:33,181 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:43:33,182 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:33 WrapperNode [2020-07-21 16:43:33,182 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:43:33,183 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:43:33,183 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:43:33,183 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:43:33,196 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:33" (1/1) ... [2020-07-21 16:43:33,196 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:33" (1/1) ... [2020-07-21 16:43:33,206 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:33" (1/1) ... [2020-07-21 16:43:33,206 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:33" (1/1) ... [2020-07-21 16:43:33,222 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:33" (1/1) ... [2020-07-21 16:43:33,231 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:33" (1/1) ... [2020-07-21 16:43:33,233 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:33" (1/1) ... [2020-07-21 16:43:33,237 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:43:33,237 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:43:33,237 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:43:33,237 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:43:33,238 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:33" (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 16:43:33,294 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:43:33,294 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:43:33,294 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 16:43:33,294 INFO L138 BoogieDeclarations]: Found implementation of procedure fabs [2020-07-21 16:43:33,295 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:43:33,295 INFO L138 BoogieDeclarations]: Found implementation of procedure ludcmp [2020-07-21 16:43:33,295 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:43:33,295 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 16:43:33,295 INFO L130 BoogieDeclarations]: Found specification of procedure ludcmp [2020-07-21 16:43:33,295 INFO L130 BoogieDeclarations]: Found specification of procedure fabs [2020-07-21 16:43:33,296 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:43:33,296 INFO L130 BoogieDeclarations]: Found specification of procedure write~real [2020-07-21 16:43:33,296 INFO L130 BoogieDeclarations]: Found specification of procedure read~real [2020-07-21 16:43:33,296 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 16:43:33,296 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 16:43:33,296 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:43:33,297 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:43:33,780 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:43:33,781 INFO L295 CfgBuilder]: Removed 11 assume(true) statements. [2020-07-21 16:43:33,785 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:43:33 BoogieIcfgContainer [2020-07-21 16:43:33,785 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:43:33,786 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:43:33,786 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:43:33,789 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:43:33,790 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:43:32" (1/3) ... [2020-07-21 16:43:33,790 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@507e0390 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:43:33, skipping insertion in model container [2020-07-21 16:43:33,790 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:43:33" (2/3) ... [2020-07-21 16:43:33,791 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@507e0390 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:43:33, skipping insertion in model container [2020-07-21 16:43:33,791 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:43:33" (3/3) ... [2020-07-21 16:43:33,793 INFO L109 eAbstractionObserver]: Analyzing ICFG lu.cmp.c [2020-07-21 16:43:33,803 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:43:33,809 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:43:33,821 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:43:33,841 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:43:33,841 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:43:33,841 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:43:33,841 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:43:33,842 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:43:33,842 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:43:33,842 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:43:33,842 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:43:33,857 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states. [2020-07-21 16:43:33,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 16:43:33,863 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:33,864 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:33,864 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:33,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:33,869 INFO L82 PathProgramCache]: Analyzing trace with hash 406725423, now seen corresponding path program 1 times [2020-07-21 16:43:33,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:33,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1800619345] [2020-07-21 16:43:33,876 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 16:43:33,977 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:33,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:33,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 16:43:33,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:34,007 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 16:43:34,007 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:43:34,009 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1800619345] [2020-07-21 16:43:34,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:43:34,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 16:43:34,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793361858] [2020-07-21 16:43:34,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 16:43:34,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:34,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 16:43:34,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 16:43:34,036 INFO L87 Difference]: Start difference. First operand 64 states. Second operand 2 states. [2020-07-21 16:43:34,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:34,076 INFO L93 Difference]: Finished difference Result 122 states and 178 transitions. [2020-07-21 16:43:34,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 16:43:34,078 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-07-21 16:43:34,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:34,089 INFO L225 Difference]: With dead ends: 122 [2020-07-21 16:43:34,089 INFO L226 Difference]: Without dead ends: 20 [2020-07-21 16:43:34,098 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 11 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 16:43:34,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-21 16:43:34,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-21 16:43:34,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-21 16:43:34,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-07-21 16:43:34,144 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 12 [2020-07-21 16:43:34,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:34,145 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-07-21 16:43:34,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 16:43:34,145 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-07-21 16:43:34,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 16:43:34,146 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:34,146 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:34,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:34,360 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:34,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:34,362 INFO L82 PathProgramCache]: Analyzing trace with hash 394719650, now seen corresponding path program 1 times [2020-07-21 16:43:34,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:34,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1706058590] [2020-07-21 16:43:34,363 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 16:43:34,423 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:43:34,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:34,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:43:34,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:34,458 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 16:43:34,459 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:43:34,459 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1706058590] [2020-07-21 16:43:34,459 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:43:34,459 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 16:43:34,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160444618] [2020-07-21 16:43:34,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 16:43:34,462 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:34,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 16:43:34,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 16:43:34,463 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 4 states. [2020-07-21 16:43:34,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:34,498 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2020-07-21 16:43:34,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 16:43:34,499 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-07-21 16:43:34,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:34,500 INFO L225 Difference]: With dead ends: 38 [2020-07-21 16:43:34,501 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 16:43:34,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 16:43:34,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 16:43:34,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2020-07-21 16:43:34,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 16:43:34,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-07-21 16:43:34,508 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 12 [2020-07-21 16:43:34,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:34,508 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-07-21 16:43:34,509 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 16:43:34,509 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-07-21 16:43:34,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 16:43:34,510 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:34,510 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:34,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:34,724 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:34,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:34,725 INFO L82 PathProgramCache]: Analyzing trace with hash -1180233829, now seen corresponding path program 1 times [2020-07-21 16:43:34,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:34,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [102705369] [2020-07-21 16:43:34,727 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 16:43:34,779 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:43:34,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:34,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:43:34,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:34,822 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 16:43:34,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:43:34,893 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 16:43:34,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [102705369] [2020-07-21 16:43:34,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:43:34,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-21 16:43:34,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745864883] [2020-07-21 16:43:34,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 16:43:34,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:34,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 16:43:34,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-07-21 16:43:34,902 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 8 states. [2020-07-21 16:43:34,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:34,985 INFO L93 Difference]: Finished difference Result 48 states and 58 transitions. [2020-07-21 16:43:34,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:43:34,986 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 16 [2020-07-21 16:43:34,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:34,987 INFO L225 Difference]: With dead ends: 48 [2020-07-21 16:43:34,987 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 16:43:34,988 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=50, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:43:34,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 16:43:34,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 16:43:34,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 16:43:34,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2020-07-21 16:43:34,994 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 16 [2020-07-21 16:43:34,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:34,995 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2020-07-21 16:43:34,995 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 16:43:34,995 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2020-07-21 16:43:34,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 16:43:34,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:34,996 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:35,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:35,212 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:35,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:35,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1296658810, now seen corresponding path program 2 times [2020-07-21 16:43:35,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:35,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [308253232] [2020-07-21 16:43:35,214 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 16:43:35,271 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:43:35,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:35,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 16:43:35,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:35,298 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:43:35,298 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:43:35,298 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [308253232] [2020-07-21 16:43:35,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:43:35,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 16:43:35,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188080616] [2020-07-21 16:43:35,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 16:43:35,300 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:35,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 16:43:35,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 16:43:35,300 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand 4 states. [2020-07-21 16:43:35,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:35,336 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2020-07-21 16:43:35,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 16:43:35,336 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 28 [2020-07-21 16:43:35,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:35,338 INFO L225 Difference]: With dead ends: 87 [2020-07-21 16:43:35,339 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 16:43:35,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 16:43:35,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 16:43:35,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 36. [2020-07-21 16:43:35,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 16:43:35,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-07-21 16:43:35,350 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 28 [2020-07-21 16:43:35,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:35,351 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-07-21 16:43:35,351 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 16:43:35,351 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-07-21 16:43:35,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 16:43:35,352 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:35,352 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:35,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:35,566 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:35,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:35,567 INFO L82 PathProgramCache]: Analyzing trace with hash -479010360, now seen corresponding path program 1 times [2020-07-21 16:43:35,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:35,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1447827277] [2020-07-21 16:43:35,569 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 16:43:35,627 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:35,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:35,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 16:43:35,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:35,704 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 16:43:35,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:43:35,773 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 16:43:35,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1447827277] [2020-07-21 16:43:35,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:43:35,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-07-21 16:43:35,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599322390] [2020-07-21 16:43:35,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:43:35,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:35,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:43:35,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=107, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:43:35,776 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 14 states. [2020-07-21 16:43:35,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:35,871 INFO L93 Difference]: Finished difference Result 71 states and 85 transitions. [2020-07-21 16:43:35,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:43:35,872 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 28 [2020-07-21 16:43:35,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:35,873 INFO L225 Difference]: With dead ends: 71 [2020-07-21 16:43:35,873 INFO L226 Difference]: Without dead ends: 44 [2020-07-21 16:43:35,874 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=125, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:43:35,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-21 16:43:35,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-07-21 16:43:35,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 16:43:35,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 51 transitions. [2020-07-21 16:43:35,882 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 51 transitions. Word has length 28 [2020-07-21 16:43:35,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:35,882 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 51 transitions. [2020-07-21 16:43:35,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:43:35,883 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 51 transitions. [2020-07-21 16:43:35,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-07-21 16:43:35,884 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:35,884 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:36,097 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:36,098 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:36,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:36,098 INFO L82 PathProgramCache]: Analyzing trace with hash -850791622, now seen corresponding path program 2 times [2020-07-21 16:43:36,099 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:36,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2058201417] [2020-07-21 16:43:36,100 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 16:43:36,176 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:36,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:36,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:43:36,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:36,208 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:43:36,227 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 16:43:36,228 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:43:36,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2058201417] [2020-07-21 16:43:36,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:43:36,236 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:43:36,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546757703] [2020-07-21 16:43:36,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:43:36,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:36,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:43:36,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:43:36,238 INFO L87 Difference]: Start difference. First operand 44 states and 51 transitions. Second operand 5 states. [2020-07-21 16:43:36,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:36,301 INFO L93 Difference]: Finished difference Result 76 states and 89 transitions. [2020-07-21 16:43:36,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:43:36,302 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 36 [2020-07-21 16:43:36,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:36,303 INFO L225 Difference]: With dead ends: 76 [2020-07-21 16:43:36,304 INFO L226 Difference]: Without dead ends: 74 [2020-07-21 16:43:36,304 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 32 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 16:43:36,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-07-21 16:43:36,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 72. [2020-07-21 16:43:36,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 16:43:36,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 85 transitions. [2020-07-21 16:43:36,315 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 85 transitions. Word has length 36 [2020-07-21 16:43:36,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:36,316 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 85 transitions. [2020-07-21 16:43:36,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:43:36,316 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 85 transitions. [2020-07-21 16:43:36,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-21 16:43:36,318 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:36,318 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:36,532 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:36,533 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:36,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:36,534 INFO L82 PathProgramCache]: Analyzing trace with hash -752575031, now seen corresponding path program 1 times [2020-07-21 16:43:36,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:36,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [111581611] [2020-07-21 16:43:36,536 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 16:43:36,701 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:36,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:36,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 16:43:36,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:36,745 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 150 proven. 41 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2020-07-21 16:43:36,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:43:36,779 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 150 proven. 41 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2020-07-21 16:43:36,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [111581611] [2020-07-21 16:43:36,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:43:36,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-21 16:43:36,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355322449] [2020-07-21 16:43:36,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 16:43:36,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:36,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 16:43:36,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 16:43:36,782 INFO L87 Difference]: Start difference. First operand 72 states and 85 transitions. Second operand 8 states. [2020-07-21 16:43:36,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:36,891 INFO L93 Difference]: Finished difference Result 168 states and 196 transitions. [2020-07-21 16:43:36,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:43:36,892 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 69 [2020-07-21 16:43:36,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:36,894 INFO L225 Difference]: With dead ends: 168 [2020-07-21 16:43:36,894 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 16:43:36,895 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:43:36,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 16:43:36,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 81. [2020-07-21 16:43:36,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 16:43:36,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 94 transitions. [2020-07-21 16:43:36,906 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 94 transitions. Word has length 69 [2020-07-21 16:43:36,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:36,906 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 94 transitions. [2020-07-21 16:43:36,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 16:43:36,907 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 94 transitions. [2020-07-21 16:43:36,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-21 16:43:36,908 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:36,909 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 10, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:37,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:37,125 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:37,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:37,125 INFO L82 PathProgramCache]: Analyzing trace with hash -618561525, now seen corresponding path program 2 times [2020-07-21 16:43:37,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:37,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1324537923] [2020-07-21 16:43:37,127 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 16:43:37,305 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:37,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:37,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 16:43:37,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:37,334 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:43:37,352 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 2 proven. 159 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2020-07-21 16:43:37,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:43:37,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:43:37,401 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 2 proven. 159 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2020-07-21 16:43:37,402 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1324537923] [2020-07-21 16:43:37,402 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:43:37,402 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-21 16:43:37,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204283519] [2020-07-21 16:43:37,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 16:43:37,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:37,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 16:43:37,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 16:43:37,404 INFO L87 Difference]: Start difference. First operand 81 states and 94 transitions. Second operand 8 states. [2020-07-21 16:43:37,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:37,525 INFO L93 Difference]: Finished difference Result 167 states and 201 transitions. [2020-07-21 16:43:37,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:43:37,526 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 69 [2020-07-21 16:43:37,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:37,528 INFO L225 Difference]: With dead ends: 167 [2020-07-21 16:43:37,528 INFO L226 Difference]: Without dead ends: 165 [2020-07-21 16:43:37,530 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:43:37,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2020-07-21 16:43:37,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 163. [2020-07-21 16:43:37,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2020-07-21 16:43:37,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 197 transitions. [2020-07-21 16:43:37,566 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 197 transitions. Word has length 69 [2020-07-21 16:43:37,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:37,569 INFO L479 AbstractCegarLoop]: Abstraction has 163 states and 197 transitions. [2020-07-21 16:43:37,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 16:43:37,569 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 197 transitions. [2020-07-21 16:43:37,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2020-07-21 16:43:37,578 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:37,578 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 28, 5, 5, 5, 5, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:37,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:37,779 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:37,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:37,780 INFO L82 PathProgramCache]: Analyzing trace with hash 419958136, now seen corresponding path program 3 times [2020-07-21 16:43:37,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:37,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1364158048] [2020-07-21 16:43:37,781 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 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 16:43:37,875 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:43:37,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:37,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:43:37,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:38,005 INFO L134 CoverageAnalysis]: Checked inductivity of 1964 backedges. 1019 proven. 297 refuted. 0 times theorem prover too weak. 648 trivial. 0 not checked. [2020-07-21 16:43:38,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:43:38,090 INFO L134 CoverageAnalysis]: Checked inductivity of 1964 backedges. 1007 proven. 297 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2020-07-21 16:43:38,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1364158048] [2020-07-21 16:43:38,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:43:38,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-21 16:43:38,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907506189] [2020-07-21 16:43:38,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 16:43:38,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:38,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 16:43:38,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:43:38,093 INFO L87 Difference]: Start difference. First operand 163 states and 197 transitions. Second operand 11 states. [2020-07-21 16:43:38,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:38,281 INFO L93 Difference]: Finished difference Result 303 states and 358 transitions. [2020-07-21 16:43:38,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:43:38,282 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 168 [2020-07-21 16:43:38,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:38,285 INFO L225 Difference]: With dead ends: 303 [2020-07-21 16:43:38,286 INFO L226 Difference]: Without dead ends: 211 [2020-07-21 16:43:38,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 326 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:43:38,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2020-07-21 16:43:38,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 163. [2020-07-21 16:43:38,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2020-07-21 16:43:38,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 194 transitions. [2020-07-21 16:43:38,303 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 194 transitions. Word has length 168 [2020-07-21 16:43:38,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:38,317 INFO L479 AbstractCegarLoop]: Abstraction has 163 states and 194 transitions. [2020-07-21 16:43:38,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 16:43:38,318 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 194 transitions. [2020-07-21 16:43:38,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2020-07-21 16:43:38,323 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:38,323 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 27, 5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:38,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:38,538 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:38,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:38,539 INFO L82 PathProgramCache]: Analyzing trace with hash -1916434374, now seen corresponding path program 4 times [2020-07-21 16:43:38,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:38,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89091537] [2020-07-21 16:43:38,541 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:39,877 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:39,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:39,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 16:43:39,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:40,033 INFO L134 CoverageAnalysis]: Checked inductivity of 1964 backedges. 219 proven. 1454 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2020-07-21 16:43:40,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:43:40,144 INFO L134 CoverageAnalysis]: Checked inductivity of 1964 backedges. 219 proven. 1454 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2020-07-21 16:43:40,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89091537] [2020-07-21 16:43:40,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:43:40,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-21 16:43:40,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176247723] [2020-07-21 16:43:40,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:43:40,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:40,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:43:40,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:43:40,146 INFO L87 Difference]: Start difference. First operand 163 states and 194 transitions. Second operand 17 states. [2020-07-21 16:43:40,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:40,789 INFO L93 Difference]: Finished difference Result 299 states and 351 transitions. [2020-07-21 16:43:40,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 16:43:40,790 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 168 [2020-07-21 16:43:40,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:40,793 INFO L225 Difference]: With dead ends: 299 [2020-07-21 16:43:40,793 INFO L226 Difference]: Without dead ends: 236 [2020-07-21 16:43:40,794 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 320 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=81, Invalid=621, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:43:40,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2020-07-21 16:43:40,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 184. [2020-07-21 16:43:40,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-07-21 16:43:40,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 211 transitions. [2020-07-21 16:43:40,821 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 211 transitions. Word has length 168 [2020-07-21 16:43:40,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:40,822 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 211 transitions. [2020-07-21 16:43:40,822 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:43:40,822 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 211 transitions. [2020-07-21 16:43:40,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2020-07-21 16:43:40,827 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:40,827 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 25, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:41,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:41,030 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:41,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:41,031 INFO L82 PathProgramCache]: Analyzing trace with hash 2135886202, now seen corresponding path program 5 times [2020-07-21 16:43:41,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:41,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119163733] [2020-07-21 16:43:41,033 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 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 16:43:42,861 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:43:42,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:42,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:43:42,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:42,915 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:43:42,966 INFO L134 CoverageAnalysis]: Checked inductivity of 1964 backedges. 8 proven. 1602 refuted. 0 times theorem prover too weak. 354 trivial. 0 not checked. [2020-07-21 16:43:42,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:43:42,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:43:43,100 INFO L134 CoverageAnalysis]: Checked inductivity of 1964 backedges. 8 proven. 1602 refuted. 0 times theorem prover too weak. 354 trivial. 0 not checked. [2020-07-21 16:43:43,101 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119163733] [2020-07-21 16:43:43,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:43:43,101 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-21 16:43:43,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612372040] [2020-07-21 16:43:43,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:43:43,102 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:43,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:43:43,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:43:43,103 INFO L87 Difference]: Start difference. First operand 184 states and 211 transitions. Second operand 14 states. [2020-07-21 16:43:43,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:43,266 INFO L93 Difference]: Finished difference Result 345 states and 414 transitions. [2020-07-21 16:43:43,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:43:43,266 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 168 [2020-07-21 16:43:43,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:43,269 INFO L225 Difference]: With dead ends: 345 [2020-07-21 16:43:43,269 INFO L226 Difference]: Without dead ends: 343 [2020-07-21 16:43:43,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 321 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:43:43,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2020-07-21 16:43:43,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 341. [2020-07-21 16:43:43,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2020-07-21 16:43:43,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 410 transitions. [2020-07-21 16:43:43,289 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 410 transitions. Word has length 168 [2020-07-21 16:43:43,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:43,289 INFO L479 AbstractCegarLoop]: Abstraction has 341 states and 410 transitions. [2020-07-21 16:43:43,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:43:43,290 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 410 transitions. [2020-07-21 16:43:43,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 367 [2020-07-21 16:43:43,295 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:43,295 INFO L422 BasicCegarLoop]: trace histogram [66, 66, 66, 61, 11, 11, 11, 11, 10, 10, 10, 10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:43,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:43,509 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:43,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:43,509 INFO L82 PathProgramCache]: Analyzing trace with hash -1434461414, now seen corresponding path program 6 times [2020-07-21 16:43:43,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:43,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047668435] [2020-07-21 16:43:43,510 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:43,629 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:43:43,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:43:43,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 16:43:43,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:43:43,869 INFO L134 CoverageAnalysis]: Checked inductivity of 9761 backedges. 4946 proven. 2355 refuted. 0 times theorem prover too weak. 2460 trivial. 0 not checked. [2020-07-21 16:43:43,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:43:44,104 INFO L134 CoverageAnalysis]: Checked inductivity of 9761 backedges. 4856 proven. 2355 refuted. 0 times theorem prover too weak. 2550 trivial. 0 not checked. [2020-07-21 16:43:44,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047668435] [2020-07-21 16:43:44,105 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:43:44,105 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 20 [2020-07-21 16:43:44,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472372586] [2020-07-21 16:43:44,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:43:44,106 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:43:44,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:43:44,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=331, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:43:44,107 INFO L87 Difference]: Start difference. First operand 341 states and 410 transitions. Second operand 20 states. [2020-07-21 16:43:44,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:43:44,833 INFO L93 Difference]: Finished difference Result 613 states and 728 transitions. [2020-07-21 16:43:44,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 16:43:44,834 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 366 [2020-07-21 16:43:44,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:43:44,837 INFO L225 Difference]: With dead ends: 613 [2020-07-21 16:43:44,838 INFO L226 Difference]: Without dead ends: 434 [2020-07-21 16:43:44,840 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 746 GetRequests, 713 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=1081, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:43:44,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2020-07-21 16:43:44,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 342. [2020-07-21 16:43:44,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 342 states. [2020-07-21 16:43:44,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 406 transitions. [2020-07-21 16:43:44,860 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 406 transitions. Word has length 366 [2020-07-21 16:43:44,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:43:44,860 INFO L479 AbstractCegarLoop]: Abstraction has 342 states and 406 transitions. [2020-07-21 16:43:44,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:43:44,860 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 406 transitions. [2020-07-21 16:43:44,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 367 [2020-07-21 16:43:44,866 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:43:44,866 INFO L422 BasicCegarLoop]: trace histogram [66, 66, 66, 60, 11, 11, 11, 11, 10, 10, 10, 10, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:43:45,080 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:43:45,081 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:43:45,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:43:45,082 INFO L82 PathProgramCache]: Analyzing trace with hash -1961855464, now seen corresponding path program 7 times [2020-07-21 16:43:45,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:43:45,083 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [631095116] [2020-07-21 16:43:45,083 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in