/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 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 14:02:07,987 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 14:02:07,990 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 14:02:08,002 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 14:02:08,003 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 14:02:08,004 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 14:02:08,005 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 14:02:08,007 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 14:02:08,009 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 14:02:08,010 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 14:02:08,011 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 14:02:08,012 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 14:02:08,012 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 14:02:08,013 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 14:02:08,014 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 14:02:08,016 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 14:02:08,016 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 14:02:08,017 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 14:02:08,019 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 14:02:08,021 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 14:02:08,023 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 14:02:08,026 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 14:02:08,027 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 14:02:08,028 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 14:02:08,035 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 14:02:08,050 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 14:02:08,051 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 14:02:08,052 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 14:02:08,053 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 14:02:08,082 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 14:02:08,083 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 14:02:08,085 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 14:02:08,085 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 14:02:08,085 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 14:02:08,085 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 14:02:08,086 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 14:02:08,086 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 14:02:08,086 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 14:02:08,086 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 14:02:08,087 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 14:02:08,087 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 14:02:08,088 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 14:02:08,088 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 14:02:08,088 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 14:02:08,088 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 14:02:08,088 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 14:02:08,089 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 14:02:08,089 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 14:02:08,089 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 14:02:08,089 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 14:02:08,089 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 14:02:08,090 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 14:02:08,090 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 14:02:08,090 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 14:02:08,090 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 14:02:08,090 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:08,091 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 14:02:08,091 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 14:02:08,091 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 14:02:08,385 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 14:02:08,398 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 14:02:08,402 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 14:02:08,403 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 14:02:08,404 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 14:02:08,404 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-07-21 14:02:08,469 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7f39d6468/749e3cd598cc43f0a014be0520507364/FLAG043b618ee [2020-07-21 14:02:08,935 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 14:02:08,936 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-07-21 14:02:08,946 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7f39d6468/749e3cd598cc43f0a014be0520507364/FLAG043b618ee [2020-07-21 14:02:09,303 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7f39d6468/749e3cd598cc43f0a014be0520507364 [2020-07-21 14:02:09,316 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 14:02:09,320 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 14:02:09,325 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 14:02:09,325 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 14:02:09,329 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 14:02:09,330 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:02:09" (1/1) ... [2020-07-21 14:02:09,333 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ab40a35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:09, skipping insertion in model container [2020-07-21 14:02:09,333 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:02:09" (1/1) ... [2020-07-21 14:02:09,342 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 14:02:09,362 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 14:02:09,578 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:02:09,582 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 14:02:09,602 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:02:09,622 INFO L208 MainTranslator]: Completed translation [2020-07-21 14:02:09,623 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:09 WrapperNode [2020-07-21 14:02:09,623 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 14:02:09,624 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 14:02:09,624 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 14:02:09,624 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 14:02:09,718 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:09" (1/1) ... [2020-07-21 14:02:09,718 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:09" (1/1) ... [2020-07-21 14:02:09,727 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:09" (1/1) ... [2020-07-21 14:02:09,727 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:09" (1/1) ... [2020-07-21 14:02:09,734 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:09" (1/1) ... [2020-07-21 14:02:09,739 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:09" (1/1) ... [2020-07-21 14:02:09,740 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:09" (1/1) ... [2020-07-21 14:02:09,747 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 14:02:09,748 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 14:02:09,748 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 14:02:09,748 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 14:02:09,749 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:09" (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 14:02:09,806 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 14:02:09,807 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 14:02:09,807 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 14:02:09,807 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 14:02:09,807 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 14:02:09,807 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 14:02:09,808 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 14:02:09,808 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 14:02:09,808 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 14:02:09,808 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 14:02:09,808 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 14:02:09,808 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 14:02:09,809 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 14:02:10,046 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 14:02:10,046 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 14:02:10,054 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:02:10 BoogieIcfgContainer [2020-07-21 14:02:10,055 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 14:02:10,056 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 14:02:10,056 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 14:02:10,068 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 14:02:10,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 02:02:09" (1/3) ... [2020-07-21 14:02:10,070 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b17ec0f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:02:10, skipping insertion in model container [2020-07-21 14:02:10,070 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:09" (2/3) ... [2020-07-21 14:02:10,072 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b17ec0f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:02:10, skipping insertion in model container [2020-07-21 14:02:10,073 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:02:10" (3/3) ... [2020-07-21 14:02:10,079 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-07-21 14:02:10,113 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 14:02:10,134 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 14:02:10,168 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 14:02:10,201 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 14:02:10,201 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 14:02:10,202 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 14:02:10,202 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 14:02:10,202 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 14:02:10,202 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 14:02:10,202 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 14:02:10,202 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 14:02:10,234 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-21 14:02:10,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 14:02:10,240 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:10,242 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:10,242 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:10,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:10,247 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-07-21 14:02:10,255 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:10,255 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [338283482] [2020-07-21 14:02:10,256 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 14:02:10,344 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:02:10,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:02:10,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 14:02:10,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:02:10,372 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 14:02:10,373 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:02:10,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [338283482] [2020-07-21 14:02:10,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:02:10,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 14:02:10,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228987790] [2020-07-21 14:02:10,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 14:02:10,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:02:10,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 14:02:10,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 14:02:10,395 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-07-21 14:02:10,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:02:10,415 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-07-21 14:02:10,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 14:02:10,416 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-07-21 14:02:10,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:02:10,423 INFO L225 Difference]: With dead ends: 34 [2020-07-21 14:02:10,424 INFO L226 Difference]: Without dead ends: 14 [2020-07-21 14:02:10,427 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 14:02:10,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-21 14:02:10,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-21 14:02:10,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-21 14:02:10,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-21 14:02:10,459 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-21 14:02:10,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:02:10,460 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-21 14:02:10,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 14:02:10,460 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-21 14:02:10,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 14:02:10,461 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:10,461 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:10,676 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:10,676 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:10,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:10,677 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-07-21 14:02:10,678 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:10,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1423977611] [2020-07-21 14:02:10,679 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 14:02:10,720 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:02:10,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:02:10,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 14:02:10,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:02:10,763 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 14:02:10,763 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:02:10,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1423977611] [2020-07-21 14:02:10,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:02:10,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 14:02:10,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463856042] [2020-07-21 14:02:10,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 14:02:10,767 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:02:10,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 14:02:10,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 14:02:10,768 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 3 states. [2020-07-21 14:02:10,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:02:10,805 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-07-21 14:02:10,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 14:02:10,806 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-07-21 14:02:10,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:02:10,808 INFO L225 Difference]: With dead ends: 22 [2020-07-21 14:02:10,808 INFO L226 Difference]: Without dead ends: 16 [2020-07-21 14:02:10,809 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 14:02:10,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-21 14:02:10,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-07-21 14:02:10,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-21 14:02:10,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-21 14:02:10,819 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-07-21 14:02:10,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:02:10,820 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-21 14:02:10,820 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 14:02:10,820 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-21 14:02:10,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 14:02:10,822 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:10,823 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:11,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:11,039 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:11,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:11,040 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-07-21 14:02:11,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:11,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [924836000] [2020-07-21 14:02:11,041 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 14:02:11,093 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:02:11,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:02:11,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 14:02:11,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:02:11,118 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 14:02:11,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:02:11,159 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 14:02:11,160 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [924836000] [2020-07-21 14:02:11,160 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:02:11,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 14:02:11,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881462830] [2020-07-21 14:02:11,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 14:02:11,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:02:11,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 14:02:11,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 14:02:11,163 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 6 states. [2020-07-21 14:02:11,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:02:11,204 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2020-07-21 14:02:11,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 14:02:11,205 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-07-21 14:02:11,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:02:11,206 INFO L225 Difference]: With dead ends: 27 [2020-07-21 14:02:11,206 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 14:02:11,207 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 14:02:11,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 14:02:11,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 14:02:11,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 14:02:11,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-07-21 14:02:11,213 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 14 [2020-07-21 14:02:11,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:02:11,214 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-07-21 14:02:11,214 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 14:02:11,214 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-07-21 14:02:11,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 14:02:11,215 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:11,215 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:11,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:11,430 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:11,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:11,431 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 2 times [2020-07-21 14:02:11,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:11,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [314764523] [2020-07-21 14:02:11,432 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 14:02:11,502 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:02:11,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:02:11,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 14:02:11,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:02:11,582 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 14:02:11,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:02:11,688 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 14:02:11,688 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [314764523] [2020-07-21 14:02:11,688 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:02:11,689 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 14:02:11,689 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097682003] [2020-07-21 14:02:11,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 14:02:11,690 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:02:11,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 14:02:11,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 14:02:11,692 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 12 states. [2020-07-21 14:02:11,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:02:11,765 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2020-07-21 14:02:11,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 14:02:11,767 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 20 [2020-07-21 14:02:11,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:02:11,768 INFO L225 Difference]: With dead ends: 39 [2020-07-21 14:02:11,768 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 14:02:11,769 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 14:02:11,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 14:02:11,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 14:02:11,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 14:02:11,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-07-21 14:02:11,776 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 20 [2020-07-21 14:02:11,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:02:11,777 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-07-21 14:02:11,777 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 14:02:11,777 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-07-21 14:02:11,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-21 14:02:11,778 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:11,778 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:11,992 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:11,993 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:11,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:11,994 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 3 times [2020-07-21 14:02:11,995 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:11,995 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [647192688] [2020-07-21 14:02:11,996 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 14:02:12,175 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:02:12,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:02:12,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 14:02:12,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:02:12,312 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 14:02:12,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:02:12,567 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 14:02:12,568 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [647192688] [2020-07-21 14:02:12,568 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:02:12,568 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-21 14:02:12,569 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398105604] [2020-07-21 14:02:12,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 14:02:12,570 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:02:12,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 14:02:12,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 14:02:12,571 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 24 states. [2020-07-21 14:02:12,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:02:12,687 INFO L93 Difference]: Finished difference Result 63 states and 74 transitions. [2020-07-21 14:02:12,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 14:02:12,688 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 32 [2020-07-21 14:02:12,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:02:12,690 INFO L225 Difference]: With dead ends: 63 [2020-07-21 14:02:12,690 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 14:02:12,692 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 14:02:12,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 14:02:12,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-21 14:02:12,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-21 14:02:12,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-07-21 14:02:12,702 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 32 [2020-07-21 14:02:12,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:02:12,703 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-07-21 14:02:12,703 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 14:02:12,703 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-07-21 14:02:12,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 14:02:12,705 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:12,706 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:12,920 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:12,921 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:12,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:12,922 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 4 times [2020-07-21 14:02:12,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:12,923 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [427309301] [2020-07-21 14:02:12,923 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 14:02:13,451 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:02:13,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:02:13,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 14:02:13,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:02:13,862 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 14:02:13,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:02:14,819 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 14:02:14,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [427309301] [2020-07-21 14:02:14,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:02:14,821 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-21 14:02:14,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901504668] [2020-07-21 14:02:14,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 14:02:14,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:02:14,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 14:02:14,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 14:02:14,835 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 48 states. [2020-07-21 14:02:15,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:02:15,059 INFO L93 Difference]: Finished difference Result 111 states and 134 transitions. [2020-07-21 14:02:15,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 14:02:15,060 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 56 [2020-07-21 14:02:15,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:02:15,062 INFO L225 Difference]: With dead ends: 111 [2020-07-21 14:02:15,062 INFO L226 Difference]: Without dead ends: 105 [2020-07-21 14:02:15,066 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 14:02:15,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-07-21 14:02:15,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2020-07-21 14:02:15,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-07-21 14:02:15,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-07-21 14:02:15,093 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 56 [2020-07-21 14:02:15,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:02:15,095 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-07-21 14:02:15,095 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 14:02:15,096 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-07-21 14:02:15,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-07-21 14:02:15,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:15,102 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:15,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:15,315 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:15,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:15,316 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 5 times [2020-07-21 14:02:15,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:15,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1358865709] [2020-07-21 14:02:15,317 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 14:05:07,526 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:05:07,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:05:08,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-21 14:05:08,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:05:10,300 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 14:05:10,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:05:14,178 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 14:05:14,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1358865709] [2020-07-21 14:05:14,180 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:05:14,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-21 14:05:14,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444303675] [2020-07-21 14:05:14,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-21 14:05:14,182 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:05:14,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-21 14:05:14,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 14:05:14,188 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 96 states. [2020-07-21 14:05:14,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:05:14,726 INFO L93 Difference]: Finished difference Result 207 states and 254 transitions. [2020-07-21 14:05:14,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-21 14:05:14,729 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 104 [2020-07-21 14:05:14,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:05:14,732 INFO L225 Difference]: With dead ends: 207 [2020-07-21 14:05:14,733 INFO L226 Difference]: Without dead ends: 201 [2020-07-21 14:05:14,736 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 14:05:14,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-07-21 14:05:14,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 201. [2020-07-21 14:05:14,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2020-07-21 14:05:14,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 201 transitions. [2020-07-21 14:05:14,755 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 201 transitions. Word has length 104 [2020-07-21 14:05:14,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:05:14,755 INFO L479 AbstractCegarLoop]: Abstraction has 201 states and 201 transitions. [2020-07-21 14:05:14,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-21 14:05:14,756 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 201 transitions. [2020-07-21 14:05:14,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2020-07-21 14:05:14,760 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:05:14,760 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:05:14,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:05:14,974 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:05:14,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:05:14,975 INFO L82 PathProgramCache]: Analyzing trace with hash 1695638553, now seen corresponding path program 6 times [2020-07-21 14:05:14,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:05:14,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [542376266] [2020-07-21 14:05:14,977 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