/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:44:45,679 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:44:45,682 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:44:45,698 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:44:45,699 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:44:45,700 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:44:45,702 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:44:45,704 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:44:45,707 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:44:45,708 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:44:45,709 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:44:45,710 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:44:45,711 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:44:45,713 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:44:45,714 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:44:45,716 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:44:45,717 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:44:45,718 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:44:45,722 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:44:45,724 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:44:45,726 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:44:45,728 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:44:45,730 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:44:45,732 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:44:45,735 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:44:45,746 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:44:45,748 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:44:45,749 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:44:45,750 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 16:44:45,771 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:44:45,772 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:44:45,775 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:44:45,775 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:44:45,775 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:44:45,776 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:44:45,776 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:44:45,776 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:44:45,776 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:44:45,776 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:44:45,776 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:44:45,777 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:44:45,777 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:44:45,777 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:44:45,781 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:44:45,781 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:44:45,781 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:44:45,782 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:44:45,782 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:44:45,782 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:44:45,783 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:44:45,783 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:44:45,783 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:44:45,783 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:44:45,783 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:44:45,784 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:44:45,784 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:45,784 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:44:45,784 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:44:45,784 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 16:44:46,139 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:44:46,157 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:44:46,162 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:44:46,164 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:44:46,168 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:44:46,169 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-07-21 16:44:46,272 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e7e2ebad5/536a03a9b43b4d35a3ba6a57da617da9/FLAG75a39df18 [2020-07-21 16:44:46,960 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:44:46,962 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-07-21 16:44:46,972 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e7e2ebad5/536a03a9b43b4d35a3ba6a57da617da9/FLAG75a39df18 [2020-07-21 16:44:47,218 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e7e2ebad5/536a03a9b43b4d35a3ba6a57da617da9 [2020-07-21 16:44:47,230 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:44:47,233 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:44:47,234 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:44:47,235 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:44:47,240 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:44:47,241 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:44:47" (1/1) ... [2020-07-21 16:44:47,246 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e2af008 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:47, skipping insertion in model container [2020-07-21 16:44:47,246 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:44:47" (1/1) ... [2020-07-21 16:44:47,256 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:44:47,279 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:44:47,498 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:44:47,505 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:44:47,530 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:44:47,556 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:44:47,557 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:47 WrapperNode [2020-07-21 16:44:47,557 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:44:47,558 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:44:47,559 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:44:47,559 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:44:47,678 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:47" (1/1) ... [2020-07-21 16:44:47,678 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:47" (1/1) ... [2020-07-21 16:44:47,689 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:47" (1/1) ... [2020-07-21 16:44:47,689 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:47" (1/1) ... [2020-07-21 16:44:47,698 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:47" (1/1) ... [2020-07-21 16:44:47,705 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:47" (1/1) ... [2020-07-21 16:44:47,706 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:47" (1/1) ... [2020-07-21 16:44:47,716 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:44:47,716 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:44:47,717 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:44:47,717 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:44:47,718 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:47" (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 16:44:47,803 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:44:47,804 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:44:47,804 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 16:44:47,804 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:44:47,804 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:44:47,804 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 16:44:47,805 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:44:47,805 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 16:44:47,805 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 16:44:47,805 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 16:44:47,805 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 16:44:47,805 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:44:47,806 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:44:48,063 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:44:48,064 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 16:44:48,069 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:44:48 BoogieIcfgContainer [2020-07-21 16:44:48,070 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:44:48,071 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:44:48,072 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:44:48,084 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:44:48,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:44:47" (1/3) ... [2020-07-21 16:44:48,089 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77fbc04d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:44:48, skipping insertion in model container [2020-07-21 16:44:48,089 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:44:47" (2/3) ... [2020-07-21 16:44:48,090 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77fbc04d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:44:48, skipping insertion in model container [2020-07-21 16:44:48,094 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:44:48" (3/3) ... [2020-07-21 16:44:48,104 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-07-21 16:44:48,131 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:44:48,160 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:44:48,216 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:44:48,278 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:44:48,278 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:44:48,279 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:44:48,279 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:44:48,279 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:44:48,279 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:44:48,279 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:44:48,280 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:44:48,301 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-21 16:44:48,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 16:44:48,307 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:44:48,308 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:44:48,309 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:44:48,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:44:48,317 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-07-21 16:44:48,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:44:48,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [29198158] [2020-07-21 16:44:48,327 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 16:44:48,473 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:44:48,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:44:48,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 16:44:48,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:44:48,515 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 16:44:48,515 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:44:48,517 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [29198158] [2020-07-21 16:44:48,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:44:48,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 16:44:48,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444029230] [2020-07-21 16:44:48,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 16:44:48,529 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:44:48,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 16:44:48,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 16:44:48,548 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-07-21 16:44:48,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:44:48,581 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-07-21 16:44:48,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 16:44:48,583 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-07-21 16:44:48,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:44:48,594 INFO L225 Difference]: With dead ends: 34 [2020-07-21 16:44:48,595 INFO L226 Difference]: Without dead ends: 14 [2020-07-21 16:44:48,600 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 16:44:48,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-21 16:44:48,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-21 16:44:48,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-21 16:44:48,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-21 16:44:48,648 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-21 16:44:48,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:44:48,649 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-21 16:44:48,649 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 16:44:48,649 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-21 16:44:48,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 16:44:48,650 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:44:48,650 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:44:48,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:48,859 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:44:48,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:44:48,860 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-07-21 16:44:48,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:44:48,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [784461858] [2020-07-21 16:44:48,861 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 16:44:48,924 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:44:48,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:44:48,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 16:44:48,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:44:48,966 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 16:44:48,967 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:44:48,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [784461858] [2020-07-21 16:44:48,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:44:48,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:44:48,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009871712] [2020-07-21 16:44:48,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:44:48,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:44:48,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:44:48,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:44:48,973 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 3 states. [2020-07-21 16:44:49,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:44:49,019 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-07-21 16:44:49,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:44:49,021 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-07-21 16:44:49,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:44:49,023 INFO L225 Difference]: With dead ends: 22 [2020-07-21 16:44:49,023 INFO L226 Difference]: Without dead ends: 16 [2020-07-21 16:44:49,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:44:49,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-21 16:44:49,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-07-21 16:44:49,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-21 16:44:49,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-21 16:44:49,031 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-07-21 16:44:49,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:44:49,032 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-21 16:44:49,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:44:49,032 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-21 16:44:49,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 16:44:49,033 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:44:49,034 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:44:49,241 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:49,242 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:44:49,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:44:49,243 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-07-21 16:44:49,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:44:49,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1643804323] [2020-07-21 16:44:49,246 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 16:44:49,316 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:44:49,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:44:49,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:44:49,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:44:49,353 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 16:44:49,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:44:49,407 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 16:44:49,408 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1643804323] [2020-07-21 16:44:49,408 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:44:49,408 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 16:44:49,409 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418275036] [2020-07-21 16:44:49,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 16:44:49,410 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:44:49,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 16:44:49,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:44:49,412 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 6 states. [2020-07-21 16:44:49,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:44:49,458 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2020-07-21 16:44:49,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 16:44:49,459 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-07-21 16:44:49,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:44:49,460 INFO L225 Difference]: With dead ends: 27 [2020-07-21 16:44:49,461 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 16:44:49,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:44:49,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 16:44:49,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 16:44:49,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 16:44:49,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-07-21 16:44:49,469 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 14 [2020-07-21 16:44:49,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:44:49,469 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-07-21 16:44:49,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 16:44:49,470 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-07-21 16:44:49,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 16:44:49,471 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:44:49,471 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:44:49,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:49,686 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:44:49,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:44:49,687 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 2 times [2020-07-21 16:44:49,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:44:49,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [665875020] [2020-07-21 16:44:49,689 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 16:44:49,748 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:44:49,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:44:49,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:44:49,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:44:49,823 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:44:49,824 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:44:49,938 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:44:49,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [665875020] [2020-07-21 16:44:49,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:44:49,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 16:44:49,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934838816] [2020-07-21 16:44:49,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:44:49,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:44:49,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:44:49,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:44:49,943 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 12 states. [2020-07-21 16:44:50,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:44:50,078 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2020-07-21 16:44:50,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:44:50,079 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 20 [2020-07-21 16:44:50,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:44:50,081 INFO L225 Difference]: With dead ends: 39 [2020-07-21 16:44:50,081 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 16:44:50,082 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:44:50,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 16:44:50,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 16:44:50,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 16:44:50,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-07-21 16:44:50,094 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 20 [2020-07-21 16:44:50,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:44:50,095 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-07-21 16:44:50,095 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:44:50,095 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-07-21 16:44:50,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-21 16:44:50,097 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:44:50,097 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:44:50,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:50,312 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:44:50,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:44:50,313 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 3 times [2020-07-21 16:44:50,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:44:50,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [4303126] [2020-07-21 16:44:50,315 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 16:44:50,500 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:44:50,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:44:50,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:44:50,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:44:50,690 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:44:50,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:44:51,137 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:44:51,139 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [4303126] [2020-07-21 16:44:51,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:44:51,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-21 16:44:51,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657545329] [2020-07-21 16:44:51,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 16:44:51,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:44:51,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 16:44:51,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:44:51,143 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 24 states. [2020-07-21 16:44:51,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:44:51,337 INFO L93 Difference]: Finished difference Result 63 states and 74 transitions. [2020-07-21 16:44:51,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 16:44:51,338 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 32 [2020-07-21 16:44:51,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:44:51,340 INFO L225 Difference]: With dead ends: 63 [2020-07-21 16:44:51,341 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 16:44:51,342 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:44:51,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 16:44:51,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-21 16:44:51,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-21 16:44:51,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-07-21 16:44:51,356 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 32 [2020-07-21 16:44:51,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:44:51,357 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-07-21 16:44:51,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 16:44:51,357 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-07-21 16:44:51,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 16:44:51,360 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:44:51,361 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:44:51,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:44:51,574 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:44:51,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:44:51,575 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 4 times [2020-07-21 16:44:51,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:44:51,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1398857464] [2020-07-21 16:44:51,576 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 16:44:58,107 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:44:58,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:44:58,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:44:58,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:44:58,740 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:44:58,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:45:00,042 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:45:00,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1398857464] [2020-07-21 16:45:00,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:45:00,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-21 16:45:00,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904025330] [2020-07-21 16:45:00,062 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 16:45:00,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:45:00,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 16:45:00,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 16:45:00,068 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 48 states. [2020-07-21 16:45:00,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:45:00,415 INFO L93 Difference]: Finished difference Result 111 states and 134 transitions. [2020-07-21 16:45:00,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 16:45:00,416 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 56 [2020-07-21 16:45:00,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:45:00,419 INFO L225 Difference]: With dead ends: 111 [2020-07-21 16:45:00,419 INFO L226 Difference]: Without dead ends: 105 [2020-07-21 16:45:00,422 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 16:45:00,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-07-21 16:45:00,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2020-07-21 16:45:00,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-07-21 16:45:00,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-07-21 16:45:00,439 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 56 [2020-07-21 16:45:00,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:45:00,440 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-07-21 16:45:00,440 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 16:45:00,440 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-07-21 16:45:00,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-07-21 16:45:00,444 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:45:00,445 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:45:00,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:45:00,646 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:45:00,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:45:00,647 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 5 times [2020-07-21 16:45:00,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:45:00,648 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [760310423] [2020-07-21 16:45:00,648 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 16:47:45,519 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:47:45,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:47:46,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-21 16:47:46,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:47:47,966 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:47:47,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:47:52,532 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:47:52,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [760310423] [2020-07-21 16:47:52,534 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:47:52,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-21 16:47:52,534 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850697231] [2020-07-21 16:47:52,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-21 16:47:52,542 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:47:52,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-21 16:47:52,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 16:47:52,552 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 96 states. [2020-07-21 16:47:53,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:47:53,345 INFO L93 Difference]: Finished difference Result 207 states and 254 transitions. [2020-07-21 16:47:53,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-21 16:47:53,345 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 104 [2020-07-21 16:47:53,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:47:53,348 INFO L225 Difference]: With dead ends: 207 [2020-07-21 16:47:53,348 INFO L226 Difference]: Without dead ends: 201 [2020-07-21 16:47:53,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 16:47:53,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-07-21 16:47:53,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 201. [2020-07-21 16:47:53,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2020-07-21 16:47:53,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 201 transitions. [2020-07-21 16:47:53,385 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 201 transitions. Word has length 104 [2020-07-21 16:47:53,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:47:53,386 INFO L479 AbstractCegarLoop]: Abstraction has 201 states and 201 transitions. [2020-07-21 16:47:53,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-21 16:47:53,387 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 201 transitions. [2020-07-21 16:47:53,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2020-07-21 16:47:53,390 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:47:53,391 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:47:53,605 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:47:53,606 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:47:53,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:47:53,607 INFO L82 PathProgramCache]: Analyzing trace with hash 1695638553, now seen corresponding path program 6 times [2020-07-21 16:47:53,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:47:53,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1435152792] [2020-07-21 16:47:53,609 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