/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 DAGSIZE --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 22:18:13,437 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 22:18:13,441 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 22:18:13,468 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 22:18:13,469 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 22:18:13,470 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 22:18:13,472 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 22:18:13,483 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 22:18:13,488 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 22:18:13,490 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 22:18:13,490 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 22:18:13,493 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 22:18:13,493 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 22:18:13,495 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 22:18:13,497 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 22:18:13,500 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 22:18:13,503 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 22:18:13,505 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 22:18:13,507 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 22:18:13,514 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 22:18:13,519 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 22:18:13,522 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 22:18:13,523 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 22:18:13,524 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 22:18:13,526 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 22:18:13,541 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 22:18:13,543 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 22:18:13,545 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 22:18:13,546 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 22:18:13,588 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 22:18:13,589 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 22:18:13,590 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 22:18:13,590 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 22:18:13,591 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 22:18:13,591 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 22:18:13,591 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 22:18:13,591 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 22:18:13,591 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 22:18:13,592 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 22:18:13,592 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 22:18:13,592 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 22:18:13,592 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 22:18:13,592 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 22:18:13,593 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 22:18:13,593 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 22:18:13,593 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 22:18:13,594 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 22:18:13,594 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 22:18:13,594 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 22:18:13,594 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 22:18:13,594 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:18:13,595 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 22:18:13,595 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 22:18:13,595 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 22:18:13,595 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 22:18:13,595 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:18:13,596 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 22:18:13,596 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 22:18:13,596 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 -> DAGSIZE 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 22:18:13,931 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 22:18:13,946 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 22:18:13,951 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 22:18:13,953 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 22:18:13,953 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 22:18:13,954 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-20 22:18:14,039 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c498e756b/43dbcea0f4744749a0159ccc38825516/FLAG013780318 [2020-07-20 22:18:14,741 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 22:18:14,741 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-20 22:18:14,752 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c498e756b/43dbcea0f4744749a0159ccc38825516/FLAG013780318 [2020-07-20 22:18:15,063 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c498e756b/43dbcea0f4744749a0159ccc38825516 [2020-07-20 22:18:15,074 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 22:18:15,078 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 22:18:15,081 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 22:18:15,082 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 22:18:15,087 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 22:18:15,088 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:18:15" (1/1) ... [2020-07-20 22:18:15,091 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@669fb32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:15, skipping insertion in model container [2020-07-20 22:18:15,091 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:18:15" (1/1) ... [2020-07-20 22:18:15,103 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 22:18:15,129 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 22:18:15,408 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:18:15,420 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 22:18:15,454 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:18:15,477 INFO L208 MainTranslator]: Completed translation [2020-07-20 22:18:15,477 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:15 WrapperNode [2020-07-20 22:18:15,477 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 22:18:15,478 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 22:18:15,478 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 22:18:15,478 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 22:18:15,585 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:15" (1/1) ... [2020-07-20 22:18:15,586 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:15" (1/1) ... [2020-07-20 22:18:15,597 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:15" (1/1) ... [2020-07-20 22:18:15,598 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:15" (1/1) ... [2020-07-20 22:18:15,614 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:15" (1/1) ... [2020-07-20 22:18:15,619 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:15" (1/1) ... [2020-07-20 22:18:15,628 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:15" (1/1) ... [2020-07-20 22:18:15,632 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 22:18:15,633 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 22:18:15,633 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 22:18:15,633 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 22:18:15,640 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:15" (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 22:18:15,707 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 22:18:15,708 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 22:18:15,708 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 22:18:15,708 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 22:18:15,708 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 22:18:15,709 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 22:18:15,709 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 22:18:15,710 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 22:18:15,710 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 22:18:15,710 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 22:18:15,710 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 22:18:15,710 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 22:18:15,711 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 22:18:15,711 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 22:18:15,987 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 22:18:15,987 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-20 22:18:15,998 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:18:15 BoogieIcfgContainer [2020-07-20 22:18:15,999 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 22:18:16,015 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 22:18:16,019 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 22:18:16,029 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 22:18:16,030 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:18:15" (1/3) ... [2020-07-20 22:18:16,035 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@465647d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:18:16, skipping insertion in model container [2020-07-20 22:18:16,035 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:18:15" (2/3) ... [2020-07-20 22:18:16,036 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@465647d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:18:16, skipping insertion in model container [2020-07-20 22:18:16,039 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:18:15" (3/3) ... [2020-07-20 22:18:16,042 INFO L109 eAbstractionObserver]: Analyzing ICFG array_3-1.i [2020-07-20 22:18:16,072 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 22:18:16,083 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 22:18:16,126 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 22:18:16,155 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 22:18:16,156 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 22:18:16,156 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 22:18:16,156 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 22:18:16,156 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 22:18:16,156 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 22:18:16,156 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 22:18:16,156 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 22:18:16,176 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-20 22:18:16,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 22:18:16,184 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:18:16,185 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:18:16,185 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:18:16,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:18:16,190 INFO L82 PathProgramCache]: Analyzing trace with hash -413900697, now seen corresponding path program 1 times [2020-07-20 22:18:16,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:18:16,199 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1448371732] [2020-07-20 22:18:16,200 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 22:18:16,312 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:18:16,313 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:18:16,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 22:18:16,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:18:16,377 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 22:18:16,410 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 22:18:16,411 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:18:16,412 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1448371732] [2020-07-20 22:18:16,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:18:16,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 22:18:16,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515608796] [2020-07-20 22:18:16,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 22:18:16,422 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:18:16,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 22:18:16,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 22:18:16,436 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 5 states. [2020-07-20 22:18:16,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:18:16,583 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-07-20 22:18:16,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 22:18:16,587 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 22:18:16,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:18:16,596 INFO L225 Difference]: With dead ends: 56 [2020-07-20 22:18:16,597 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 22:18:16,604 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 22:18:16,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 22:18:16,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2020-07-20 22:18:16,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 22:18:16,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-07-20 22:18:16,650 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 13 [2020-07-20 22:18:16,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:18:16,651 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-07-20 22:18:16,651 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 22:18:16,651 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-07-20 22:18:16,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 22:18:16,653 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:18:16,653 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:18:16,867 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:18:16,868 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:18:16,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:18:16,870 INFO L82 PathProgramCache]: Analyzing trace with hash -955555818, now seen corresponding path program 1 times [2020-07-20 22:18:16,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:18:16,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1192088751] [2020-07-20 22:18:16,871 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 22:18:16,932 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:18:16,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:18:16,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 22:18:16,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:18:16,976 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 22:18:16,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:18:17,045 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 22:18:17,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1192088751] [2020-07-20 22:18:17,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:18:17,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 22:18:17,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44383158] [2020-07-20 22:18:17,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 22:18:17,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:18:17,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 22:18:17,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 22:18:17,051 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 6 states. [2020-07-20 22:18:17,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:18:17,176 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2020-07-20 22:18:17,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 22:18:17,177 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-07-20 22:18:17,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:18:17,181 INFO L225 Difference]: With dead ends: 51 [2020-07-20 22:18:17,181 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 22:18:17,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 35 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 22:18:17,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 22:18:17,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2020-07-20 22:18:17,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 22:18:17,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2020-07-20 22:18:17,196 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 20 [2020-07-20 22:18:17,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:18:17,196 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2020-07-20 22:18:17,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 22:18:17,197 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2020-07-20 22:18:17,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 22:18:17,198 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:18:17,199 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:18:17,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:18:17,415 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:18:17,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:18:17,416 INFO L82 PathProgramCache]: Analyzing trace with hash 1732065724, now seen corresponding path program 2 times [2020-07-20 22:18:17,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:18:17,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [131468354] [2020-07-20 22:18:17,419 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 22:18:17,489 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:18:17,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:18:17,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 22:18:17,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:18:17,558 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 22:18:17,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:18:17,677 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 22:18:17,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [131468354] [2020-07-20 22:18:17,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:18:17,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 22:18:17,680 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169107589] [2020-07-20 22:18:17,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 22:18:17,682 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:18:17,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 22:18:17,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 22:18:17,683 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 12 states. [2020-07-20 22:18:17,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:18:17,938 INFO L93 Difference]: Finished difference Result 101 states and 126 transitions. [2020-07-20 22:18:17,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 22:18:17,939 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 26 [2020-07-20 22:18:17,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:18:17,941 INFO L225 Difference]: With dead ends: 101 [2020-07-20 22:18:17,941 INFO L226 Difference]: Without dead ends: 80 [2020-07-20 22:18:17,944 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 41 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 22:18:17,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-07-20 22:18:17,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2020-07-20 22:18:17,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 22:18:17,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 82 transitions. [2020-07-20 22:18:17,960 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 82 transitions. Word has length 26 [2020-07-20 22:18:17,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:18:17,960 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 82 transitions. [2020-07-20 22:18:17,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 22:18:17,961 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 82 transitions. [2020-07-20 22:18:17,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-20 22:18:17,962 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:18:17,963 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:18:18,178 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:18:18,179 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:18:18,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:18:18,180 INFO L82 PathProgramCache]: Analyzing trace with hash 1818054536, now seen corresponding path program 3 times [2020-07-20 22:18:18,181 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:18:18,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2075099360] [2020-07-20 22:18:18,182 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 22:18:18,332 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:18:18,332 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:18:18,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 22:18:18,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:18:18,527 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 22:18:18,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:18:18,862 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 22:18:18,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2075099360] [2020-07-20 22:18:18,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:18:18,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-20 22:18:18,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799578047] [2020-07-20 22:18:18,865 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 22:18:18,865 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:18:18,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 22:18:18,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-20 22:18:18,866 INFO L87 Difference]: Start difference. First operand 72 states and 82 transitions. Second operand 24 states. [2020-07-20 22:18:19,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:18:19,357 INFO L93 Difference]: Finished difference Result 209 states and 264 transitions. [2020-07-20 22:18:19,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 22:18:19,358 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 38 [2020-07-20 22:18:19,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:18:19,360 INFO L225 Difference]: With dead ends: 209 [2020-07-20 22:18:19,360 INFO L226 Difference]: Without dead ends: 164 [2020-07-20 22:18:19,362 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-20 22:18:19,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2020-07-20 22:18:19,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 144. [2020-07-20 22:18:19,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 22:18:19,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 166 transitions. [2020-07-20 22:18:19,384 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 166 transitions. Word has length 38 [2020-07-20 22:18:19,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:18:19,385 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 166 transitions. [2020-07-20 22:18:19,385 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 22:18:19,385 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 166 transitions. [2020-07-20 22:18:19,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-20 22:18:19,387 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:18:19,388 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:18:19,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:18:19,603 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:18:19,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:18:19,604 INFO L82 PathProgramCache]: Analyzing trace with hash -2091023072, now seen corresponding path program 4 times [2020-07-20 22:18:19,605 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:18:19,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1961746566] [2020-07-20 22:18:19,606 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 22:18:22,475 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:18:22,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:18:22,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 22:18:22,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:18:22,902 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 22:18:22,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:18:24,011 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 22:18:24,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1961746566] [2020-07-20 22:18:24,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:18:24,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-20 22:18:24,012 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299849045] [2020-07-20 22:18:24,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 22:18:24,014 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:18:24,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 22:18:24,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 22:18:24,017 INFO L87 Difference]: Start difference. First operand 144 states and 166 transitions. Second operand 48 states. [2020-07-20 22:18:24,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:18:24,865 INFO L93 Difference]: Finished difference Result 425 states and 540 transitions. [2020-07-20 22:18:24,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 22:18:24,866 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 62 [2020-07-20 22:18:24,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:18:24,869 INFO L225 Difference]: With dead ends: 425 [2020-07-20 22:18:24,869 INFO L226 Difference]: Without dead ends: 332 [2020-07-20 22:18:24,874 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 22:18:24,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2020-07-20 22:18:24,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 288. [2020-07-20 22:18:24,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-20 22:18:24,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 334 transitions. [2020-07-20 22:18:24,930 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 334 transitions. Word has length 62 [2020-07-20 22:18:24,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:18:24,930 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 334 transitions. [2020-07-20 22:18:24,930 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 22:18:24,930 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 334 transitions. [2020-07-20 22:18:24,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-07-20 22:18:24,934 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:18:24,934 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:18:25,135 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:18:25,135 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:18:25,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:18:25,136 INFO L82 PathProgramCache]: Analyzing trace with hash 1687296080, now seen corresponding path program 5 times [2020-07-20 22:18:25,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:18:25,137 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1368997025] [2020-07-20 22:18:25,138 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 22:22:24,676 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:22:24,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:22:26,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-20 22:22:26,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:22:28,068 INFO L134 CoverageAnalysis]: Checked inductivity of 2118 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 22:22:28,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:22:31,644 INFO L134 CoverageAnalysis]: Checked inductivity of 2118 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 22:22:31,644 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1368997025] [2020-07-20 22:22:31,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:22:31,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-20 22:22:31,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957863027] [2020-07-20 22:22:31,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-20 22:22:31,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:22:31,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-20 22:22:31,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 22:22:31,657 INFO L87 Difference]: Start difference. First operand 288 states and 334 transitions. Second operand 96 states. [2020-07-20 22:22:34,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:22:34,432 INFO L93 Difference]: Finished difference Result 857 states and 1092 transitions. [2020-07-20 22:22:34,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-20 22:22:34,433 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 110 [2020-07-20 22:22:34,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:22:34,440 INFO L225 Difference]: With dead ends: 857 [2020-07-20 22:22:34,440 INFO L226 Difference]: Without dead ends: 668 [2020-07-20 22:22:34,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 22:22:34,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 668 states. [2020-07-20 22:22:34,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 668 to 576. [2020-07-20 22:22:34,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 576 states. [2020-07-20 22:22:34,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 576 states to 576 states and 670 transitions. [2020-07-20 22:22:34,494 INFO L78 Accepts]: Start accepts. Automaton has 576 states and 670 transitions. Word has length 110 [2020-07-20 22:22:34,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:22:34,497 INFO L479 AbstractCegarLoop]: Abstraction has 576 states and 670 transitions. [2020-07-20 22:22:34,497 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-20 22:22:34,497 INFO L276 IsEmpty]: Start isEmpty. Operand 576 states and 670 transitions. [2020-07-20 22:22:34,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2020-07-20 22:22:34,507 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:22:34,507 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:22:34,721 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:22:34,722 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:22:34,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:22:34,723 INFO L82 PathProgramCache]: Analyzing trace with hash 292282032, now seen corresponding path program 6 times [2020-07-20 22:22:34,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:22:34,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1885211326] [2020-07-20 22:22:34,724 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