/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_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 14:20:15,504 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 14:20:15,507 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 14:20:15,521 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 14:20:15,522 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 14:20:15,523 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 14:20:15,525 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 14:20:15,527 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 14:20:15,529 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 14:20:15,530 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 14:20:15,531 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 14:20:15,532 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 14:20:15,532 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 14:20:15,534 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 14:20:15,535 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 14:20:15,536 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 14:20:15,537 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 14:20:15,538 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 14:20:15,540 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 14:20:15,542 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 14:20:15,543 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 14:20:15,544 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 14:20:15,546 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 14:20:15,547 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 14:20:15,549 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 14:20:15,558 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 14:20:15,559 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 14:20:15,564 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 14:20:15,564 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 14:20:15,587 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 14:20:15,587 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 14:20:15,591 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 14:20:15,592 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 14:20:15,592 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 14:20:15,592 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 14:20:15,592 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 14:20:15,592 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 14:20:15,593 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 14:20:15,593 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 14:20:15,593 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 14:20:15,593 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 14:20:15,593 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 14:20:15,594 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 14:20:15,594 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 14:20:15,594 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 14:20:15,594 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 14:20:15,594 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 14:20:15,595 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 14:20:15,595 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 14:20:15,595 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 14:20:15,595 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:20:15,596 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 14:20:15,596 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 14:20:15,596 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 14:20:15,596 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 14:20:15,597 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:20:15,597 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 14:20:15,597 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 14:20:15,597 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_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 14:20:15,923 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 14:20:15,939 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 14:20:15,943 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 14:20:15,945 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 14:20:15,945 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 14:20:15,946 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-20 14:20:16,022 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e7103604e/55ddc36b50604a65bc53a56b95864f1a/FLAG8618c25e0 [2020-07-20 14:20:16,538 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 14:20:16,539 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-20 14:20:16,549 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e7103604e/55ddc36b50604a65bc53a56b95864f1a/FLAG8618c25e0 [2020-07-20 14:20:16,868 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e7103604e/55ddc36b50604a65bc53a56b95864f1a [2020-07-20 14:20:16,879 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 14:20:16,883 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 14:20:16,884 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 14:20:16,884 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 14:20:16,888 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 14:20:16,889 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:20:16" (1/1) ... [2020-07-20 14:20:16,893 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7269e0db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:20:16, skipping insertion in model container [2020-07-20 14:20:16,893 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:20:16" (1/1) ... [2020-07-20 14:20:16,903 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 14:20:16,924 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 14:20:17,141 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:20:17,148 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 14:20:17,169 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:20:17,192 INFO L208 MainTranslator]: Completed translation [2020-07-20 14:20:17,193 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:20:17 WrapperNode [2020-07-20 14:20:17,193 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 14:20:17,194 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 14:20:17,194 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 14:20:17,195 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 14:20:17,315 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:20:17" (1/1) ... [2020-07-20 14:20:17,316 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:20:17" (1/1) ... [2020-07-20 14:20:17,332 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:20:17" (1/1) ... [2020-07-20 14:20:17,333 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:20:17" (1/1) ... [2020-07-20 14:20:17,349 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:20:17" (1/1) ... [2020-07-20 14:20:17,356 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:20:17" (1/1) ... [2020-07-20 14:20:17,365 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:20:17" (1/1) ... [2020-07-20 14:20:17,373 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 14:20:17,375 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 14:20:17,376 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 14:20:17,376 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 14:20:17,377 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:20:17" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:20:17,452 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 14:20:17,452 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 14:20:17,452 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 14:20:17,452 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 14:20:17,452 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 14:20:17,453 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 14:20:17,453 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 14:20:17,453 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 14:20:17,453 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 14:20:17,453 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 14:20:17,453 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 14:20:17,453 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 14:20:17,454 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 14:20:17,454 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 14:20:17,713 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 14:20:17,713 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-20 14:20:17,718 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:20:17 BoogieIcfgContainer [2020-07-20 14:20:17,718 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 14:20:17,720 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 14:20:17,720 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 14:20:17,725 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 14:20:17,726 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 02:20:16" (1/3) ... [2020-07-20 14:20:17,727 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f21884c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:20:17, skipping insertion in model container [2020-07-20 14:20:17,728 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:20:17" (2/3) ... [2020-07-20 14:20:17,728 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f21884c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:20:17, skipping insertion in model container [2020-07-20 14:20:17,729 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:20:17" (3/3) ... [2020-07-20 14:20:17,731 INFO L109 eAbstractionObserver]: Analyzing ICFG array_3-1.i [2020-07-20 14:20:17,746 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 14:20:17,757 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 14:20:17,782 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 14:20:17,849 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 14:20:17,850 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 14:20:17,850 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 14:20:17,850 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 14:20:17,851 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 14:20:17,851 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 14:20:17,851 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 14:20:17,852 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 14:20:17,906 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-20 14:20:17,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 14:20:17,914 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:20:17,916 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:20:17,916 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:20:17,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:20:17,924 INFO L82 PathProgramCache]: Analyzing trace with hash -413900697, now seen corresponding path program 1 times [2020-07-20 14:20:17,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:20:17,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [162673480] [2020-07-20 14:20:17,935 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:20:18,016 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:20:18,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:20:18,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 14:20:18,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:20:18,050 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:20:18,050 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:20:18,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [162673480] [2020-07-20 14:20:18,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:20:18,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 14:20:18,054 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094658671] [2020-07-20 14:20:18,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 14:20:18,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:20:18,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 14:20:18,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 14:20:18,077 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2020-07-20 14:20:18,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:20:18,101 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-07-20 14:20:18,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 14:20:18,102 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2020-07-20 14:20:18,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:20:18,110 INFO L225 Difference]: With dead ends: 42 [2020-07-20 14:20:18,110 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 14:20:18,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 14:20:18,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 14:20:18,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 14:20:18,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 14:20:18,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-07-20 14:20:18,157 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2020-07-20 14:20:18,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:20:18,157 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-07-20 14:20:18,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 14:20:18,158 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-07-20 14:20:18,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 14:20:18,159 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:20:18,159 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:20:18,373 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:20:18,374 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:20:18,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:20:18,375 INFO L82 PathProgramCache]: Analyzing trace with hash 2053026861, now seen corresponding path program 1 times [2020-07-20 14:20:18,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:20:18,376 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [898539064] [2020-07-20 14:20:18,376 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:20:18,467 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:20:18,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:20:18,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 14:20:18,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:20:18,517 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:20:18,518 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:20:18,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [898539064] [2020-07-20 14:20:18,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:20:18,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 14:20:18,520 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747339550] [2020-07-20 14:20:18,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 14:20:18,522 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:20:18,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 14:20:18,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 14:20:18,523 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 3 states. [2020-07-20 14:20:18,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:20:18,569 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 14:20:18,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 14:20:18,569 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-07-20 14:20:18,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:20:18,573 INFO L225 Difference]: With dead ends: 35 [2020-07-20 14:20:18,573 INFO L226 Difference]: Without dead ends: 25 [2020-07-20 14:20:18,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 14:20:18,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-20 14:20:18,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-07-20 14:20:18,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 14:20:18,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-07-20 14:20:18,585 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 14 [2020-07-20 14:20:18,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:20:18,586 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-07-20 14:20:18,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 14:20:18,587 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-07-20 14:20:18,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 14:20:18,588 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:20:18,588 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:20:18,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:20:18,804 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:20:18,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:20:18,805 INFO L82 PathProgramCache]: Analyzing trace with hash 1766388751, now seen corresponding path program 1 times [2020-07-20 14:20:18,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:20:18,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1704338364] [2020-07-20 14:20:18,807 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:20:18,873 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:20:18,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:20:18,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 14:20:18,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:20:18,923 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:20:18,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:20:18,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:20:18,969 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1704338364] [2020-07-20 14:20:18,969 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:20:18,969 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 14:20:18,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180307284] [2020-07-20 14:20:18,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 14:20:18,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:20:18,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 14:20:18,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 14:20:18,972 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 6 states. [2020-07-20 14:20:19,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:20:19,069 INFO L93 Difference]: Finished difference Result 52 states and 64 transitions. [2020-07-20 14:20:19,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 14:20:19,069 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-07-20 14:20:19,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:20:19,071 INFO L225 Difference]: With dead ends: 52 [2020-07-20 14:20:19,071 INFO L226 Difference]: Without dead ends: 39 [2020-07-20 14:20:19,072 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 14:20:19,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-20 14:20:19,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-07-20 14:20:19,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 14:20:19,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-07-20 14:20:19,083 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 16 [2020-07-20 14:20:19,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:20:19,083 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-07-20 14:20:19,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 14:20:19,084 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-07-20 14:20:19,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 14:20:19,085 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:20:19,085 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:20:19,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:20:19,299 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:20:19,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:20:19,300 INFO L82 PathProgramCache]: Analyzing trace with hash 671453365, now seen corresponding path program 2 times [2020-07-20 14:20:19,301 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:20:19,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [525594034] [2020-07-20 14:20:19,302 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:20:19,361 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:20:19,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:20:19,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 14:20:19,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:20:19,421 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:20:19,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:20:19,526 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:20:19,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [525594034] [2020-07-20 14:20:19,527 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:20:19,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 14:20:19,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665461076] [2020-07-20 14:20:19,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 14:20:19,528 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:20:19,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 14:20:19,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 14:20:19,530 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 12 states. [2020-07-20 14:20:19,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:20:19,787 INFO L93 Difference]: Finished difference Result 102 states and 129 transitions. [2020-07-20 14:20:19,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 14:20:19,788 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2020-07-20 14:20:19,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:20:19,793 INFO L225 Difference]: With dead ends: 102 [2020-07-20 14:20:19,793 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 14:20:19,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 14:20:19,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 14:20:19,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 72. [2020-07-20 14:20:19,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 14:20:19,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 83 transitions. [2020-07-20 14:20:19,828 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 83 transitions. Word has length 22 [2020-07-20 14:20:19,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:20:19,829 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 83 transitions. [2020-07-20 14:20:19,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 14:20:19,829 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 83 transitions. [2020-07-20 14:20:19,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-20 14:20:19,830 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:20:19,831 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:20:20,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:20:20,047 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:20:20,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:20:20,048 INFO L82 PathProgramCache]: Analyzing trace with hash -1999606655, now seen corresponding path program 3 times [2020-07-20 14:20:20,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:20:20,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [341330826] [2020-07-20 14:20:20,049 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:20:20,157 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:20:20,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:20:20,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 14:20:20,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:20:20,295 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:20:20,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:20:20,564 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:20:20,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [341330826] [2020-07-20 14:20:20,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:20:20,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-20 14:20:20,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420669189] [2020-07-20 14:20:20,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 14:20:20,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:20:20,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 14:20:20,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-20 14:20:20,567 INFO L87 Difference]: Start difference. First operand 72 states and 83 transitions. Second operand 24 states. [2020-07-20 14:20:20,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:20:20,927 INFO L93 Difference]: Finished difference Result 210 states and 267 transitions. [2020-07-20 14:20:20,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 14:20:20,928 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 34 [2020-07-20 14:20:20,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:20:20,930 INFO L225 Difference]: With dead ends: 210 [2020-07-20 14:20:20,931 INFO L226 Difference]: Without dead ends: 165 [2020-07-20 14:20:20,932 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-20 14:20:20,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2020-07-20 14:20:20,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 144. [2020-07-20 14:20:20,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 14:20:20,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 167 transitions. [2020-07-20 14:20:20,952 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 167 transitions. Word has length 34 [2020-07-20 14:20:20,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:20:20,952 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 167 transitions. [2020-07-20 14:20:20,952 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 14:20:20,953 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 167 transitions. [2020-07-20 14:20:20,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-20 14:20:20,954 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:20:20,955 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:20:21,169 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:20:21,171 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:20:21,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:20:21,172 INFO L82 PathProgramCache]: Analyzing trace with hash -54841831, now seen corresponding path program 4 times [2020-07-20 14:20:21,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:20:21,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849492302] [2020-07-20 14:20:21,174 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:20:22,651 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:20:22,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:20:22,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 14:20:22,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:20:23,073 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:20:23,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:20:24,029 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:20:24,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849492302] [2020-07-20 14:20:24,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:20:24,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-20 14:20:24,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593834764] [2020-07-20 14:20:24,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 14:20:24,031 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:20:24,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 14:20:24,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 14:20:24,034 INFO L87 Difference]: Start difference. First operand 144 states and 167 transitions. Second operand 48 states. [2020-07-20 14:20:24,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:20:24,844 INFO L93 Difference]: Finished difference Result 426 states and 543 transitions. [2020-07-20 14:20:24,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 14:20:24,845 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 58 [2020-07-20 14:20:24,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:20:24,849 INFO L225 Difference]: With dead ends: 426 [2020-07-20 14:20:24,849 INFO L226 Difference]: Without dead ends: 333 [2020-07-20 14:20:24,852 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 14:20:24,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-20 14:20:24,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 288. [2020-07-20 14:20:24,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-20 14:20:24,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 335 transitions. [2020-07-20 14:20:24,908 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 335 transitions. Word has length 58 [2020-07-20 14:20:24,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:20:24,908 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 335 transitions. [2020-07-20 14:20:24,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 14:20:24,909 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 335 transitions. [2020-07-20 14:20:24,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-20 14:20:24,914 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:20:24,915 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:20:25,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:20:25,122 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:20:25,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:20:25,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1746458953, now seen corresponding path program 5 times [2020-07-20 14:20:25,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:20:25,123 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [909793096] [2020-07-20 14:20:25,124 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:23:32,533 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:23:32,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:23:33,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-20 14:23:33,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:23:35,201 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:23:35,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:23:38,861 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:23:38,861 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [909793096] [2020-07-20 14:23:38,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:23:38,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-20 14:23:38,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079050438] [2020-07-20 14:23:38,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-20 14:23:38,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:23:38,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-20 14:23:38,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 14:23:38,869 INFO L87 Difference]: Start difference. First operand 288 states and 335 transitions. Second operand 96 states. [2020-07-20 14:23:41,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:23:41,819 INFO L93 Difference]: Finished difference Result 858 states and 1095 transitions. [2020-07-20 14:23:41,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-20 14:23:41,819 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 106 [2020-07-20 14:23:41,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:23:41,827 INFO L225 Difference]: With dead ends: 858 [2020-07-20 14:23:41,827 INFO L226 Difference]: Without dead ends: 669 [2020-07-20 14:23:41,833 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 14:23:41,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 669 states. [2020-07-20 14:23:41,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 669 to 576. [2020-07-20 14:23:41,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 576 states. [2020-07-20 14:23:41,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 576 states to 576 states and 671 transitions. [2020-07-20 14:23:41,871 INFO L78 Accepts]: Start accepts. Automaton has 576 states and 671 transitions. Word has length 106 [2020-07-20 14:23:41,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:23:41,874 INFO L479 AbstractCegarLoop]: Abstraction has 576 states and 671 transitions. [2020-07-20 14:23:41,875 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-20 14:23:41,875 INFO L276 IsEmpty]: Start isEmpty. Operand 576 states and 671 transitions. [2020-07-20 14:23:41,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2020-07-20 14:23:41,889 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:23:41,889 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:23:42,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:23:42,104 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:23:42,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:23:42,105 INFO L82 PathProgramCache]: Analyzing trace with hash 982831017, now seen corresponding path program 6 times [2020-07-20 14:23:42,105 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:23:42,105 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [331463631] [2020-07-20 14:23:42,106 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in