/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_10.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:12:18,112 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:12:18,116 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:12:18,133 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:12:18,134 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:12:18,136 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:12:18,139 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:12:18,142 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:12:18,145 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:12:18,147 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:12:18,148 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:12:18,150 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:12:18,151 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:12:18,152 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:12:18,155 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:12:18,157 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:12:18,159 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:12:18,161 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:12:18,163 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:12:18,168 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:12:18,171 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:12:18,173 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:12:18,175 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:12:18,176 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:12:18,181 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:12:18,198 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:12:18,199 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:12:18,200 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:12:18,202 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 17:12:18,224 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:12:18,225 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:12:18,228 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:12:18,229 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:12:18,229 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:12:18,229 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:12:18,230 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:12:18,230 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:12:18,230 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:12:18,230 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:12:18,231 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:12:18,231 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:12:18,231 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:12:18,231 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:12:18,232 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:12:18,232 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:12:18,232 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:12:18,232 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:12:18,232 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:12:18,233 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:12:18,233 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:12:18,233 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:12:18,233 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:12:18,233 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:12:18,234 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:12:18,234 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:12:18,234 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:18,234 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:12:18,234 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:12:18,235 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:12:18,647 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:12:18,690 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:12:18,697 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:12:18,700 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:12:18,701 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:12:18,703 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_10.c [2020-07-20 17:12:18,798 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/84ed8d726/dcb2ba0cc294477da16cb9caccc39a4d/FLAG9cb361f25 [2020-07-20 17:12:19,575 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:12:19,576 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_10.c [2020-07-20 17:12:19,596 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/84ed8d726/dcb2ba0cc294477da16cb9caccc39a4d/FLAG9cb361f25 [2020-07-20 17:12:19,844 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/84ed8d726/dcb2ba0cc294477da16cb9caccc39a4d [2020-07-20 17:12:19,868 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:12:19,873 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:12:19,875 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:12:19,876 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:12:19,882 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:12:19,884 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:12:19" (1/1) ... [2020-07-20 17:12:19,889 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e9bc63f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:19, skipping insertion in model container [2020-07-20 17:12:19,890 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:12:19" (1/1) ... [2020-07-20 17:12:19,903 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:12:19,939 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:12:20,224 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:12:20,232 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:12:20,293 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:12:20,316 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:12:20,317 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:20 WrapperNode [2020-07-20 17:12:20,318 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:12:20,319 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:12:20,319 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:12:20,319 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:12:20,339 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:20" (1/1) ... [2020-07-20 17:12:20,340 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:20" (1/1) ... [2020-07-20 17:12:20,484 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:20" (1/1) ... [2020-07-20 17:12:20,486 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:20" (1/1) ... [2020-07-20 17:12:20,506 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:20" (1/1) ... [2020-07-20 17:12:20,522 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:20" (1/1) ... [2020-07-20 17:12:20,530 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:20" (1/1) ... [2020-07-20 17:12:20,536 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:12:20,537 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:12:20,538 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:12:20,538 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:12:20,540 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:20" (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 17:12:20,635 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:12:20,635 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:12:20,635 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:12:20,636 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:12:20,636 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:12:20,636 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:12:20,636 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:12:20,637 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:12:21,107 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:12:21,107 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 17:12:21,121 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:12:21 BoogieIcfgContainer [2020-07-20 17:12:21,122 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:12:21,126 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:12:21,127 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:12:21,133 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:12:21,134 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:12:19" (1/3) ... [2020-07-20 17:12:21,135 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b45bc95 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:12:21, skipping insertion in model container [2020-07-20 17:12:21,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:20" (2/3) ... [2020-07-20 17:12:21,136 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b45bc95 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:12:21, skipping insertion in model container [2020-07-20 17:12:21,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:12:21" (3/3) ... [2020-07-20 17:12:21,140 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_10.c [2020-07-20 17:12:21,166 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:12:21,183 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:12:21,226 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:12:21,285 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:12:21,286 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:12:21,286 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:12:21,286 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:12:21,286 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:12:21,287 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:12:21,287 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:12:21,287 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:12:21,326 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2020-07-20 17:12:21,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:12:21,348 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:21,352 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:21,353 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:21,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:21,363 INFO L82 PathProgramCache]: Analyzing trace with hash -917347053, now seen corresponding path program 1 times [2020-07-20 17:12:21,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:21,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [90758147] [2020-07-20 17:12:21,390 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 17:12:21,572 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:21,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:21,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:21,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:21,646 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 17:12:21,647 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:21,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [90758147] [2020-07-20 17:12:21,651 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:21,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:21,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256935279] [2020-07-20 17:12:21,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:21,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:21,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:21,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:21,690 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 3 states. [2020-07-20 17:12:21,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:21,802 INFO L93 Difference]: Finished difference Result 87 states and 150 transitions. [2020-07-20 17:12:21,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:21,807 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 17:12:21,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:21,855 INFO L225 Difference]: With dead ends: 87 [2020-07-20 17:12:21,860 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 17:12:21,871 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:21,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 17:12:21,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-20 17:12:21,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 17:12:21,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 89 transitions. [2020-07-20 17:12:21,994 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 89 transitions. Word has length 20 [2020-07-20 17:12:21,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:21,997 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 89 transitions. [2020-07-20 17:12:21,997 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:21,998 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 89 transitions. [2020-07-20 17:12:22,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:12:22,000 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:22,001 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:22,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:22,216 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:22,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:22,218 INFO L82 PathProgramCache]: Analyzing trace with hash -1504153067, now seen corresponding path program 1 times [2020-07-20 17:12:22,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:22,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [242216269] [2020-07-20 17:12:22,219 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 17:12:22,344 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:22,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:22,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:22,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:22,363 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 17:12:22,364 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:22,365 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [242216269] [2020-07-20 17:12:22,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:22,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:22,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732725249] [2020-07-20 17:12:22,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:22,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:22,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:22,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:22,371 INFO L87 Difference]: Start difference. First operand 50 states and 89 transitions. Second operand 3 states. [2020-07-20 17:12:22,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:22,413 INFO L93 Difference]: Finished difference Result 117 states and 212 transitions. [2020-07-20 17:12:22,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:22,414 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 17:12:22,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:22,416 INFO L225 Difference]: With dead ends: 117 [2020-07-20 17:12:22,417 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 17:12:22,419 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:22,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 17:12:22,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2020-07-20 17:12:22,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 17:12:22,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 125 transitions. [2020-07-20 17:12:22,434 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 125 transitions. Word has length 20 [2020-07-20 17:12:22,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:22,435 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 125 transitions. [2020-07-20 17:12:22,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:22,436 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 125 transitions. [2020-07-20 17:12:22,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 17:12:22,437 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:22,437 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:22,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:22,654 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:22,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:22,655 INFO L82 PathProgramCache]: Analyzing trace with hash 1627225809, now seen corresponding path program 1 times [2020-07-20 17:12:22,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:22,657 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [165032658] [2020-07-20 17:12:22,657 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 17:12:22,722 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:12:22,723 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:22,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:22,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:22,745 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 17:12:22,749 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:22,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [165032658] [2020-07-20 17:12:22,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:22,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:22,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904641413] [2020-07-20 17:12:22,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:22,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:22,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:22,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:22,753 INFO L87 Difference]: Start difference. First operand 70 states and 125 transitions. Second operand 3 states. [2020-07-20 17:12:22,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:22,783 INFO L93 Difference]: Finished difference Result 108 states and 189 transitions. [2020-07-20 17:12:22,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:22,785 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 17:12:22,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:22,787 INFO L225 Difference]: With dead ends: 108 [2020-07-20 17:12:22,788 INFO L226 Difference]: Without dead ends: 75 [2020-07-20 17:12:22,789 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:22,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-20 17:12:22,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2020-07-20 17:12:22,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-20 17:12:22,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 127 transitions. [2020-07-20 17:12:22,806 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 127 transitions. Word has length 21 [2020-07-20 17:12:22,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:22,806 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 127 transitions. [2020-07-20 17:12:22,806 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:22,807 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 127 transitions. [2020-07-20 17:12:22,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 17:12:22,809 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:22,809 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:23,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:23,026 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:23,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:23,028 INFO L82 PathProgramCache]: Analyzing trace with hash 616108559, now seen corresponding path program 1 times [2020-07-20 17:12:23,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:23,029 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2001247155] [2020-07-20 17:12:23,030 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 17:12:23,125 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:23,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:23,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:23,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:23,160 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 17:12:23,161 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:23,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2001247155] [2020-07-20 17:12:23,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:23,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:23,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772892519] [2020-07-20 17:12:23,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:23,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:23,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:23,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:23,168 INFO L87 Difference]: Start difference. First operand 73 states and 127 transitions. Second operand 3 states. [2020-07-20 17:12:23,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:23,232 INFO L93 Difference]: Finished difference Result 136 states and 240 transitions. [2020-07-20 17:12:23,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:23,236 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 17:12:23,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:23,239 INFO L225 Difference]: With dead ends: 136 [2020-07-20 17:12:23,240 INFO L226 Difference]: Without dead ends: 134 [2020-07-20 17:12:23,241 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:23,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2020-07-20 17:12:23,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 96. [2020-07-20 17:12:23,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-20 17:12:23,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 168 transitions. [2020-07-20 17:12:23,278 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 168 transitions. Word has length 21 [2020-07-20 17:12:23,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:23,279 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 168 transitions. [2020-07-20 17:12:23,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:23,279 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 168 transitions. [2020-07-20 17:12:23,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 17:12:23,280 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:23,281 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:23,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:23,488 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:23,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:23,489 INFO L82 PathProgramCache]: Analyzing trace with hash 29302545, now seen corresponding path program 1 times [2020-07-20 17:12:23,490 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:23,490 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1373889285] [2020-07-20 17:12:23,491 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 17:12:23,567 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:23,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:23,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:23,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:23,584 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 17:12:23,585 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:23,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1373889285] [2020-07-20 17:12:23,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:23,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:23,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700468208] [2020-07-20 17:12:23,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:23,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:23,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:23,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:23,588 INFO L87 Difference]: Start difference. First operand 96 states and 168 transitions. Second operand 3 states. [2020-07-20 17:12:23,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:23,633 INFO L93 Difference]: Finished difference Result 224 states and 398 transitions. [2020-07-20 17:12:23,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:23,633 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 17:12:23,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:23,635 INFO L225 Difference]: With dead ends: 224 [2020-07-20 17:12:23,635 INFO L226 Difference]: Without dead ends: 136 [2020-07-20 17:12:23,637 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:23,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-20 17:12:23,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 134. [2020-07-20 17:12:23,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-07-20 17:12:23,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 234 transitions. [2020-07-20 17:12:23,654 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 234 transitions. Word has length 21 [2020-07-20 17:12:23,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:23,654 INFO L479 AbstractCegarLoop]: Abstraction has 134 states and 234 transitions. [2020-07-20 17:12:23,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:23,655 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 234 transitions. [2020-07-20 17:12:23,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:12:23,657 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:23,657 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:23,867 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:23,870 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:23,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:23,871 INFO L82 PathProgramCache]: Analyzing trace with hash 1919709866, now seen corresponding path program 1 times [2020-07-20 17:12:23,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:23,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1664853447] [2020-07-20 17:12:23,872 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 17:12:23,925 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:23,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:23,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:23,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:23,945 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 17:12:23,946 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:23,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1664853447] [2020-07-20 17:12:23,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:23,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:23,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765141619] [2020-07-20 17:12:23,949 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:23,952 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:23,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:23,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:23,954 INFO L87 Difference]: Start difference. First operand 134 states and 234 transitions. Second operand 3 states. [2020-07-20 17:12:23,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:23,989 INFO L93 Difference]: Finished difference Result 201 states and 349 transitions. [2020-07-20 17:12:23,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:23,990 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 17:12:23,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:23,993 INFO L225 Difference]: With dead ends: 201 [2020-07-20 17:12:23,993 INFO L226 Difference]: Without dead ends: 138 [2020-07-20 17:12:23,994 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:23,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-20 17:12:24,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2020-07-20 17:12:24,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-20 17:12:24,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 234 transitions. [2020-07-20 17:12:24,009 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 234 transitions. Word has length 22 [2020-07-20 17:12:24,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:24,009 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 234 transitions. [2020-07-20 17:12:24,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:24,010 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 234 transitions. [2020-07-20 17:12:24,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:12:24,011 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:24,012 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:24,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:24,227 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:24,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:24,229 INFO L82 PathProgramCache]: Analyzing trace with hash 908592616, now seen corresponding path program 1 times [2020-07-20 17:12:24,229 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:24,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [233908092] [2020-07-20 17:12:24,230 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:24,287 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:24,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:24,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:24,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:24,320 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 17:12:24,320 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:24,321 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [233908092] [2020-07-20 17:12:24,322 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:24,322 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:24,322 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348364626] [2020-07-20 17:12:24,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:24,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:24,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:24,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:24,326 INFO L87 Difference]: Start difference. First operand 136 states and 234 transitions. Second operand 3 states. [2020-07-20 17:12:24,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:24,364 INFO L93 Difference]: Finished difference Result 252 states and 440 transitions. [2020-07-20 17:12:24,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:24,365 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 17:12:24,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:24,368 INFO L225 Difference]: With dead ends: 252 [2020-07-20 17:12:24,369 INFO L226 Difference]: Without dead ends: 250 [2020-07-20 17:12:24,370 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:24,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-20 17:12:24,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 184. [2020-07-20 17:12:24,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-07-20 17:12:24,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 314 transitions. [2020-07-20 17:12:24,389 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 314 transitions. Word has length 22 [2020-07-20 17:12:24,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:24,390 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 314 transitions. [2020-07-20 17:12:24,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:24,391 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 314 transitions. [2020-07-20 17:12:24,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:12:24,393 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:24,393 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:24,609 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:24,610 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:24,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:24,611 INFO L82 PathProgramCache]: Analyzing trace with hash 321786602, now seen corresponding path program 1 times [2020-07-20 17:12:24,612 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:24,612 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1133458496] [2020-07-20 17:12:24,612 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:24,662 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:24,663 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:24,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:24,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:24,686 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 17:12:24,687 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:24,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1133458496] [2020-07-20 17:12:24,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:24,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:24,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607525225] [2020-07-20 17:12:24,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:24,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:24,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:24,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:24,689 INFO L87 Difference]: Start difference. First operand 184 states and 314 transitions. Second operand 3 states. [2020-07-20 17:12:24,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:24,734 INFO L93 Difference]: Finished difference Result 432 states and 744 transitions. [2020-07-20 17:12:24,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:24,735 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-20 17:12:24,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:24,737 INFO L225 Difference]: With dead ends: 432 [2020-07-20 17:12:24,738 INFO L226 Difference]: Without dead ends: 258 [2020-07-20 17:12:24,744 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:24,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-07-20 17:12:24,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 256. [2020-07-20 17:12:24,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-20 17:12:24,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 434 transitions. [2020-07-20 17:12:24,769 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 434 transitions. Word has length 22 [2020-07-20 17:12:24,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:24,770 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 434 transitions. [2020-07-20 17:12:24,770 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:24,770 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 434 transitions. [2020-07-20 17:12:24,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 17:12:24,773 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:24,773 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:24,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:24,988 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:24,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:24,989 INFO L82 PathProgramCache]: Analyzing trace with hash -1898185914, now seen corresponding path program 1 times [2020-07-20 17:12:24,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:24,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1495934584] [2020-07-20 17:12:24,991 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 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:25,042 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:25,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:25,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:25,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:25,066 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 17:12:25,067 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:25,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1495934584] [2020-07-20 17:12:25,068 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:25,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:25,068 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900078579] [2020-07-20 17:12:25,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:25,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:25,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:25,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:25,071 INFO L87 Difference]: Start difference. First operand 256 states and 434 transitions. Second operand 3 states. [2020-07-20 17:12:25,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:25,107 INFO L93 Difference]: Finished difference Result 384 states and 648 transitions. [2020-07-20 17:12:25,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:25,108 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 17:12:25,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:25,112 INFO L225 Difference]: With dead ends: 384 [2020-07-20 17:12:25,113 INFO L226 Difference]: Without dead ends: 262 [2020-07-20 17:12:25,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:25,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2020-07-20 17:12:25,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 260. [2020-07-20 17:12:25,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2020-07-20 17:12:25,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 434 transitions. [2020-07-20 17:12:25,135 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 434 transitions. Word has length 23 [2020-07-20 17:12:25,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:25,136 INFO L479 AbstractCegarLoop]: Abstraction has 260 states and 434 transitions. [2020-07-20 17:12:25,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:25,137 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 434 transitions. [2020-07-20 17:12:25,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 17:12:25,139 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:25,139 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:25,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:25,356 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:25,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:25,357 INFO L82 PathProgramCache]: Analyzing trace with hash 1385664132, now seen corresponding path program 1 times [2020-07-20 17:12:25,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:25,358 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [58562815] [2020-07-20 17:12:25,358 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:25,422 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:25,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:25,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:25,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:25,436 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 17:12:25,437 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:25,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [58562815] [2020-07-20 17:12:25,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:25,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:25,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887301579] [2020-07-20 17:12:25,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:25,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:25,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:25,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:25,440 INFO L87 Difference]: Start difference. First operand 260 states and 434 transitions. Second operand 3 states. [2020-07-20 17:12:25,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:25,472 INFO L93 Difference]: Finished difference Result 476 states and 808 transitions. [2020-07-20 17:12:25,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:25,473 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 17:12:25,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:25,478 INFO L225 Difference]: With dead ends: 476 [2020-07-20 17:12:25,478 INFO L226 Difference]: Without dead ends: 474 [2020-07-20 17:12:25,480 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:25,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 474 states. [2020-07-20 17:12:25,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 474 to 360. [2020-07-20 17:12:25,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 360 states. [2020-07-20 17:12:25,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 590 transitions. [2020-07-20 17:12:25,508 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 590 transitions. Word has length 23 [2020-07-20 17:12:25,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:25,509 INFO L479 AbstractCegarLoop]: Abstraction has 360 states and 590 transitions. [2020-07-20 17:12:25,509 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:25,509 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 590 transitions. [2020-07-20 17:12:25,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 17:12:25,512 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:25,512 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:25,716 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:25,717 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:25,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:25,718 INFO L82 PathProgramCache]: Analyzing trace with hash 798858118, now seen corresponding path program 1 times [2020-07-20 17:12:25,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:25,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1258353016] [2020-07-20 17:12:25,719 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:25,771 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:25,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:25,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:25,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:25,794 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 17:12:25,795 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:25,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1258353016] [2020-07-20 17:12:25,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:25,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:25,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890109234] [2020-07-20 17:12:25,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:25,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:25,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:25,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:25,798 INFO L87 Difference]: Start difference. First operand 360 states and 590 transitions. Second operand 3 states. [2020-07-20 17:12:25,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:25,853 INFO L93 Difference]: Finished difference Result 844 states and 1392 transitions. [2020-07-20 17:12:25,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:25,853 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 17:12:25,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:25,859 INFO L225 Difference]: With dead ends: 844 [2020-07-20 17:12:25,859 INFO L226 Difference]: Without dead ends: 498 [2020-07-20 17:12:25,861 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:25,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498 states. [2020-07-20 17:12:25,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 496. [2020-07-20 17:12:25,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 496 states. [2020-07-20 17:12:25,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 806 transitions. [2020-07-20 17:12:25,888 INFO L78 Accepts]: Start accepts. Automaton has 496 states and 806 transitions. Word has length 23 [2020-07-20 17:12:25,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:25,889 INFO L479 AbstractCegarLoop]: Abstraction has 496 states and 806 transitions. [2020-07-20 17:12:25,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:25,889 INFO L276 IsEmpty]: Start isEmpty. Operand 496 states and 806 transitions. [2020-07-20 17:12:25,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 17:12:25,891 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:25,891 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:26,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,107 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:26,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:26,108 INFO L82 PathProgramCache]: Analyzing trace with hash 6129535, now seen corresponding path program 1 times [2020-07-20 17:12:26,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:26,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1816717399] [2020-07-20 17:12:26,110 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 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,193 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:26,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:26,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:26,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:26,230 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 17:12:26,232 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:26,233 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1816717399] [2020-07-20 17:12:26,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:26,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:26,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385063273] [2020-07-20 17:12:26,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:26,235 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:26,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:26,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:26,236 INFO L87 Difference]: Start difference. First operand 496 states and 806 transitions. Second operand 3 states. [2020-07-20 17:12:26,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:26,279 INFO L93 Difference]: Finished difference Result 744 states and 1204 transitions. [2020-07-20 17:12:26,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:26,280 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 17:12:26,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:26,286 INFO L225 Difference]: With dead ends: 744 [2020-07-20 17:12:26,287 INFO L226 Difference]: Without dead ends: 506 [2020-07-20 17:12:26,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:26,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2020-07-20 17:12:26,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 504. [2020-07-20 17:12:26,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 504 states. [2020-07-20 17:12:26,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 806 transitions. [2020-07-20 17:12:26,319 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 806 transitions. Word has length 24 [2020-07-20 17:12:26,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:26,320 INFO L479 AbstractCegarLoop]: Abstraction has 504 states and 806 transitions. [2020-07-20 17:12:26,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:26,321 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 806 transitions. [2020-07-20 17:12:26,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 17:12:26,322 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:26,323 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:26,538 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,539 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:26,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:26,539 INFO L82 PathProgramCache]: Analyzing trace with hash -1004987715, now seen corresponding path program 1 times [2020-07-20 17:12:26,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:26,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [592912812] [2020-07-20 17:12:26,541 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,595 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:26,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:26,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:26,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:26,611 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 17:12:26,612 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:26,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [592912812] [2020-07-20 17:12:26,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:26,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:26,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314697324] [2020-07-20 17:12:26,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:26,615 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:26,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:26,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:26,616 INFO L87 Difference]: Start difference. First operand 504 states and 806 transitions. Second operand 3 states. [2020-07-20 17:12:26,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:26,656 INFO L93 Difference]: Finished difference Result 908 states and 1480 transitions. [2020-07-20 17:12:26,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:26,657 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 17:12:26,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:26,666 INFO L225 Difference]: With dead ends: 908 [2020-07-20 17:12:26,667 INFO L226 Difference]: Without dead ends: 906 [2020-07-20 17:12:26,668 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:26,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 906 states. [2020-07-20 17:12:26,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 906 to 712. [2020-07-20 17:12:26,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 712 states. [2020-07-20 17:12:26,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 712 states to 712 states and 1110 transitions. [2020-07-20 17:12:26,703 INFO L78 Accepts]: Start accepts. Automaton has 712 states and 1110 transitions. Word has length 24 [2020-07-20 17:12:26,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:26,704 INFO L479 AbstractCegarLoop]: Abstraction has 712 states and 1110 transitions. [2020-07-20 17:12:26,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:26,704 INFO L276 IsEmpty]: Start isEmpty. Operand 712 states and 1110 transitions. [2020-07-20 17:12:26,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 17:12:26,706 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:26,706 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:26,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:26,921 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:26,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:26,922 INFO L82 PathProgramCache]: Analyzing trace with hash -1591793729, now seen corresponding path program 1 times [2020-07-20 17:12:26,923 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:26,923 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [191433824] [2020-07-20 17:12:26,924 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 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:27,003 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:27,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:27,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:27,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:27,023 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 17:12:27,024 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:27,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [191433824] [2020-07-20 17:12:27,028 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:27,028 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:27,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793555223] [2020-07-20 17:12:27,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:27,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:27,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:27,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:27,031 INFO L87 Difference]: Start difference. First operand 712 states and 1110 transitions. Second operand 3 states. [2020-07-20 17:12:27,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:27,091 INFO L93 Difference]: Finished difference Result 1660 states and 2600 transitions. [2020-07-20 17:12:27,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:27,093 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 17:12:27,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:27,103 INFO L225 Difference]: With dead ends: 1660 [2020-07-20 17:12:27,103 INFO L226 Difference]: Without dead ends: 970 [2020-07-20 17:12:27,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:27,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 970 states. [2020-07-20 17:12:27,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 970 to 968. [2020-07-20 17:12:27,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 968 states. [2020-07-20 17:12:27,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 968 states to 968 states and 1494 transitions. [2020-07-20 17:12:27,171 INFO L78 Accepts]: Start accepts. Automaton has 968 states and 1494 transitions. Word has length 24 [2020-07-20 17:12:27,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:27,172 INFO L479 AbstractCegarLoop]: Abstraction has 968 states and 1494 transitions. [2020-07-20 17:12:27,172 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:27,173 INFO L276 IsEmpty]: Start isEmpty. Operand 968 states and 1494 transitions. [2020-07-20 17:12:27,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 17:12:27,177 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:27,177 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:27,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:27,383 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:27,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:27,384 INFO L82 PathProgramCache]: Analyzing trace with hash -1089633349, now seen corresponding path program 1 times [2020-07-20 17:12:27,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:27,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [59343398] [2020-07-20 17:12:27,386 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 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:27,475 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:27,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:27,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:27,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:27,506 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 17:12:27,507 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:27,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [59343398] [2020-07-20 17:12:27,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:27,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:27,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287003690] [2020-07-20 17:12:27,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:27,511 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:27,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:27,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:27,512 INFO L87 Difference]: Start difference. First operand 968 states and 1494 transitions. Second operand 3 states. [2020-07-20 17:12:27,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:27,554 INFO L93 Difference]: Finished difference Result 1452 states and 2232 transitions. [2020-07-20 17:12:27,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:27,555 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 17:12:27,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:27,564 INFO L225 Difference]: With dead ends: 1452 [2020-07-20 17:12:27,564 INFO L226 Difference]: Without dead ends: 986 [2020-07-20 17:12:27,570 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:27,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 986 states. [2020-07-20 17:12:27,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 986 to 984. [2020-07-20 17:12:27,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 984 states. [2020-07-20 17:12:27,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 984 states to 984 states and 1494 transitions. [2020-07-20 17:12:27,627 INFO L78 Accepts]: Start accepts. Automaton has 984 states and 1494 transitions. Word has length 25 [2020-07-20 17:12:27,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:27,629 INFO L479 AbstractCegarLoop]: Abstraction has 984 states and 1494 transitions. [2020-07-20 17:12:27,630 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:27,631 INFO L276 IsEmpty]: Start isEmpty. Operand 984 states and 1494 transitions. [2020-07-20 17:12:27,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 17:12:27,633 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:27,633 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:27,850 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:27,851 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:27,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:27,852 INFO L82 PathProgramCache]: Analyzing trace with hash -2100750599, now seen corresponding path program 1 times [2020-07-20 17:12:27,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:27,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1466607291] [2020-07-20 17:12:27,855 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 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:27,922 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:27,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:27,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:27,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:27,945 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 17:12:27,946 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:27,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1466607291] [2020-07-20 17:12:27,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:27,947 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:27,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488670827] [2020-07-20 17:12:27,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:27,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:27,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:27,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:27,958 INFO L87 Difference]: Start difference. First operand 984 states and 1494 transitions. Second operand 3 states. [2020-07-20 17:12:28,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:28,020 INFO L93 Difference]: Finished difference Result 1740 states and 2696 transitions. [2020-07-20 17:12:28,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:28,021 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 17:12:28,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:28,034 INFO L225 Difference]: With dead ends: 1740 [2020-07-20 17:12:28,035 INFO L226 Difference]: Without dead ends: 1738 [2020-07-20 17:12:28,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:28,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1738 states. [2020-07-20 17:12:28,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1738 to 1416. [2020-07-20 17:12:28,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1416 states. [2020-07-20 17:12:28,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1416 states to 1416 states and 2086 transitions. [2020-07-20 17:12:28,112 INFO L78 Accepts]: Start accepts. Automaton has 1416 states and 2086 transitions. Word has length 25 [2020-07-20 17:12:28,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:28,113 INFO L479 AbstractCegarLoop]: Abstraction has 1416 states and 2086 transitions. [2020-07-20 17:12:28,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:28,113 INFO L276 IsEmpty]: Start isEmpty. Operand 1416 states and 2086 transitions. [2020-07-20 17:12:28,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 17:12:28,117 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:28,117 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:28,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,332 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:28,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:28,333 INFO L82 PathProgramCache]: Analyzing trace with hash 1607410683, now seen corresponding path program 1 times [2020-07-20 17:12:28,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:28,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [374033364] [2020-07-20 17:12:28,333 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,413 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:28,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:28,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:28,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:28,424 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 17:12:28,425 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:28,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [374033364] [2020-07-20 17:12:28,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:28,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:28,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061156212] [2020-07-20 17:12:28,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:28,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:28,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:28,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:28,428 INFO L87 Difference]: Start difference. First operand 1416 states and 2086 transitions. Second operand 3 states. [2020-07-20 17:12:28,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:28,500 INFO L93 Difference]: Finished difference Result 3276 states and 4840 transitions. [2020-07-20 17:12:28,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:28,501 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-20 17:12:28,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:28,516 INFO L225 Difference]: With dead ends: 3276 [2020-07-20 17:12:28,517 INFO L226 Difference]: Without dead ends: 1898 [2020-07-20 17:12:28,523 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:28,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1898 states. [2020-07-20 17:12:28,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1898 to 1896. [2020-07-20 17:12:28,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1896 states. [2020-07-20 17:12:28,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1896 states to 1896 states and 2758 transitions. [2020-07-20 17:12:28,618 INFO L78 Accepts]: Start accepts. Automaton has 1896 states and 2758 transitions. Word has length 25 [2020-07-20 17:12:28,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:28,618 INFO L479 AbstractCegarLoop]: Abstraction has 1896 states and 2758 transitions. [2020-07-20 17:12:28,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:28,619 INFO L276 IsEmpty]: Start isEmpty. Operand 1896 states and 2758 transitions. [2020-07-20 17:12:28,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 17:12:28,624 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:28,624 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:28,838 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,839 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:28,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:28,840 INFO L82 PathProgramCache]: Analyzing trace with hash -698544044, now seen corresponding path program 1 times [2020-07-20 17:12:28,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:28,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [443831793] [2020-07-20 17:12:28,840 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 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:28,898 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:28,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:28,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:28,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:28,923 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 17:12:28,924 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:28,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [443831793] [2020-07-20 17:12:28,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:28,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:28,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128775136] [2020-07-20 17:12:28,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:28,928 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:28,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:28,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:28,929 INFO L87 Difference]: Start difference. First operand 1896 states and 2758 transitions. Second operand 3 states. [2020-07-20 17:12:28,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:28,991 INFO L93 Difference]: Finished difference Result 2844 states and 4120 transitions. [2020-07-20 17:12:28,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:28,991 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 17:12:28,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:29,008 INFO L225 Difference]: With dead ends: 2844 [2020-07-20 17:12:29,008 INFO L226 Difference]: Without dead ends: 1930 [2020-07-20 17:12:29,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1930 states. [2020-07-20 17:12:29,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1930 to 1928. [2020-07-20 17:12:29,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1928 states. [2020-07-20 17:12:29,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1928 states to 1928 states and 2758 transitions. [2020-07-20 17:12:29,108 INFO L78 Accepts]: Start accepts. Automaton has 1928 states and 2758 transitions. Word has length 26 [2020-07-20 17:12:29,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:29,109 INFO L479 AbstractCegarLoop]: Abstraction has 1928 states and 2758 transitions. [2020-07-20 17:12:29,109 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:29,109 INFO L276 IsEmpty]: Start isEmpty. Operand 1928 states and 2758 transitions. [2020-07-20 17:12:29,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 17:12:29,114 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:29,114 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:29,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,330 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:29,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:29,331 INFO L82 PathProgramCache]: Analyzing trace with hash -1709661294, now seen corresponding path program 1 times [2020-07-20 17:12:29,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:29,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [502802857] [2020-07-20 17:12:29,332 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 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,391 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:29,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:29,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:29,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:29,404 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 17:12:29,404 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:29,405 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [502802857] [2020-07-20 17:12:29,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:29,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:29,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432084191] [2020-07-20 17:12:29,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:29,407 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:29,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:29,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,407 INFO L87 Difference]: Start difference. First operand 1928 states and 2758 transitions. Second operand 3 states. [2020-07-20 17:12:29,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:29,489 INFO L93 Difference]: Finished difference Result 3340 states and 4872 transitions. [2020-07-20 17:12:29,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:29,491 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 17:12:29,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:29,516 INFO L225 Difference]: With dead ends: 3340 [2020-07-20 17:12:29,516 INFO L226 Difference]: Without dead ends: 3338 [2020-07-20 17:12:29,519 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:29,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3338 states. [2020-07-20 17:12:29,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3338 to 2824. [2020-07-20 17:12:29,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2824 states. [2020-07-20 17:12:29,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2824 states to 2824 states and 3910 transitions. [2020-07-20 17:12:29,723 INFO L78 Accepts]: Start accepts. Automaton has 2824 states and 3910 transitions. Word has length 26 [2020-07-20 17:12:29,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:29,724 INFO L479 AbstractCegarLoop]: Abstraction has 2824 states and 3910 transitions. [2020-07-20 17:12:29,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:29,724 INFO L276 IsEmpty]: Start isEmpty. Operand 2824 states and 3910 transitions. [2020-07-20 17:12:29,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 17:12:29,733 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:29,733 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:29,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,935 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:29,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:29,936 INFO L82 PathProgramCache]: Analyzing trace with hash 1998499988, now seen corresponding path program 1 times [2020-07-20 17:12:29,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:29,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [636875767] [2020-07-20 17:12:29,936 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:29,980 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:29,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:29,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:29,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:29,994 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 17:12:29,995 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:29,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [636875767] [2020-07-20 17:12:29,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:29,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:29,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818822716] [2020-07-20 17:12:30,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:30,000 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:30,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:30,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:30,001 INFO L87 Difference]: Start difference. First operand 2824 states and 3910 transitions. Second operand 3 states. [2020-07-20 17:12:30,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:30,106 INFO L93 Difference]: Finished difference Result 6476 states and 8968 transitions. [2020-07-20 17:12:30,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:30,107 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-20 17:12:30,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:30,135 INFO L225 Difference]: With dead ends: 6476 [2020-07-20 17:12:30,136 INFO L226 Difference]: Without dead ends: 3722 [2020-07-20 17:12:30,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:30,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3722 states. [2020-07-20 17:12:30,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3722 to 3720. [2020-07-20 17:12:30,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3720 states. [2020-07-20 17:12:30,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3720 states to 3720 states and 5062 transitions. [2020-07-20 17:12:30,348 INFO L78 Accepts]: Start accepts. Automaton has 3720 states and 5062 transitions. Word has length 26 [2020-07-20 17:12:30,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:30,349 INFO L479 AbstractCegarLoop]: Abstraction has 3720 states and 5062 transitions. [2020-07-20 17:12:30,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:30,349 INFO L276 IsEmpty]: Start isEmpty. Operand 3720 states and 5062 transitions. [2020-07-20 17:12:30,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 17:12:30,359 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:30,359 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:30,573 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:30,575 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:30,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:30,576 INFO L82 PathProgramCache]: Analyzing trace with hash -1459677136, now seen corresponding path program 1 times [2020-07-20 17:12:30,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:30,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1816921000] [2020-07-20 17:12:30,578 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 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:30,643 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:30,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:30,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:30,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:30,655 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 17:12:30,656 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:30,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1816921000] [2020-07-20 17:12:30,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:30,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:30,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708453320] [2020-07-20 17:12:30,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:30,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:30,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:30,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:30,659 INFO L87 Difference]: Start difference. First operand 3720 states and 5062 transitions. Second operand 3 states. [2020-07-20 17:12:30,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:30,748 INFO L93 Difference]: Finished difference Result 5580 states and 7560 transitions. [2020-07-20 17:12:30,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:30,749 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 17:12:30,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:30,775 INFO L225 Difference]: With dead ends: 5580 [2020-07-20 17:12:30,775 INFO L226 Difference]: Without dead ends: 3786 [2020-07-20 17:12:30,783 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:30,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3786 states. [2020-07-20 17:12:30,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3786 to 3784. [2020-07-20 17:12:30,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3784 states. [2020-07-20 17:12:30,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3784 states to 3784 states and 5062 transitions. [2020-07-20 17:12:30,934 INFO L78 Accepts]: Start accepts. Automaton has 3784 states and 5062 transitions. Word has length 27 [2020-07-20 17:12:30,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:30,935 INFO L479 AbstractCegarLoop]: Abstraction has 3784 states and 5062 transitions. [2020-07-20 17:12:30,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:30,935 INFO L276 IsEmpty]: Start isEmpty. Operand 3784 states and 5062 transitions. [2020-07-20 17:12:30,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 17:12:30,944 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:30,944 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:31,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:31,160 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:31,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:31,161 INFO L82 PathProgramCache]: Analyzing trace with hash 1824172910, now seen corresponding path program 1 times [2020-07-20 17:12:31,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:31,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1635881440] [2020-07-20 17:12:31,161 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 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:31,211 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:31,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:31,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:31,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:31,224 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 17:12:31,224 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:31,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1635881440] [2020-07-20 17:12:31,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:31,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:31,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867029817] [2020-07-20 17:12:31,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:31,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:31,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:31,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:31,227 INFO L87 Difference]: Start difference. First operand 3784 states and 5062 transitions. Second operand 3 states. [2020-07-20 17:12:31,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:31,448 INFO L93 Difference]: Finished difference Result 10956 states and 14408 transitions. [2020-07-20 17:12:31,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:31,449 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 17:12:31,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:31,514 INFO L225 Difference]: With dead ends: 10956 [2020-07-20 17:12:31,515 INFO L226 Difference]: Without dead ends: 7306 [2020-07-20 17:12:31,528 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:31,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7306 states. [2020-07-20 17:12:31,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7306 to 7304. [2020-07-20 17:12:31,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7304 states. [2020-07-20 17:12:31,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7304 states to 7304 states and 9350 transitions. [2020-07-20 17:12:31,819 INFO L78 Accepts]: Start accepts. Automaton has 7304 states and 9350 transitions. Word has length 27 [2020-07-20 17:12:31,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:31,820 INFO L479 AbstractCegarLoop]: Abstraction has 7304 states and 9350 transitions. [2020-07-20 17:12:31,820 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:31,821 INFO L276 IsEmpty]: Start isEmpty. Operand 7304 states and 9350 transitions. [2020-07-20 17:12:31,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 17:12:31,838 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:31,838 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:32,052 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,053 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:32,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:32,054 INFO L82 PathProgramCache]: Analyzing trace with hash -1883988372, now seen corresponding path program 1 times [2020-07-20 17:12:32,054 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:32,055 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [534760997] [2020-07-20 17:12:32,055 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 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,106 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:32,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:32,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:32,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:32,117 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 17:12:32,123 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:32,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [534760997] [2020-07-20 17:12:32,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:32,124 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:32,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142816547] [2020-07-20 17:12:32,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:32,127 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:32,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:32,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:32,129 INFO L87 Difference]: Start difference. First operand 7304 states and 9350 transitions. Second operand 3 states. [2020-07-20 17:12:32,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:32,294 INFO L93 Difference]: Finished difference Result 8076 states and 10632 transitions. [2020-07-20 17:12:32,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:32,295 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 17:12:32,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:32,326 INFO L225 Difference]: With dead ends: 8076 [2020-07-20 17:12:32,326 INFO L226 Difference]: Without dead ends: 8074 [2020-07-20 17:12:32,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:32,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8074 states. [2020-07-20 17:12:32,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8074 to 7304. [2020-07-20 17:12:32,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7304 states. [2020-07-20 17:12:32,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7304 states to 7304 states and 9222 transitions. [2020-07-20 17:12:32,636 INFO L78 Accepts]: Start accepts. Automaton has 7304 states and 9222 transitions. Word has length 27 [2020-07-20 17:12:32,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:32,636 INFO L479 AbstractCegarLoop]: Abstraction has 7304 states and 9222 transitions. [2020-07-20 17:12:32,636 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:32,636 INFO L276 IsEmpty]: Start isEmpty. Operand 7304 states and 9222 transitions. [2020-07-20 17:12:32,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 17:12:32,652 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:32,652 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:32,866 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,867 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:32,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:32,867 INFO L82 PathProgramCache]: Analyzing trace with hash 715001129, now seen corresponding path program 1 times [2020-07-20 17:12:32,868 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:32,868 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [861860156] [2020-07-20 17:12:32,869 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 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:32,918 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:32,918 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:32,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:32,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:32,928 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 17:12:32,928 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:32,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [861860156] [2020-07-20 17:12:32,928 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:32,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:32,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497013985] [2020-07-20 17:12:32,929 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:32,930 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:32,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:32,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:32,932 INFO L87 Difference]: Start difference. First operand 7304 states and 9222 transitions. Second operand 3 states. [2020-07-20 17:12:33,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:33,132 INFO L93 Difference]: Finished difference Result 12172 states and 15496 transitions. [2020-07-20 17:12:33,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:33,133 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-20 17:12:33,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:33,173 INFO L225 Difference]: With dead ends: 12172 [2020-07-20 17:12:33,173 INFO L226 Difference]: Without dead ends: 12170 [2020-07-20 17:12:33,184 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:33,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12170 states. [2020-07-20 17:12:33,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12170 to 11144. [2020-07-20 17:12:33,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11144 states. [2020-07-20 17:12:33,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11144 states to 11144 states and 13702 transitions. [2020-07-20 17:12:33,710 INFO L78 Accepts]: Start accepts. Automaton has 11144 states and 13702 transitions. Word has length 28 [2020-07-20 17:12:33,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:33,710 INFO L479 AbstractCegarLoop]: Abstraction has 11144 states and 13702 transitions. [2020-07-20 17:12:33,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:33,710 INFO L276 IsEmpty]: Start isEmpty. Operand 11144 states and 13702 transitions. [2020-07-20 17:12:33,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 17:12:33,744 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:33,745 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:33,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:33,959 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:33,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:33,960 INFO L82 PathProgramCache]: Analyzing trace with hash 128195115, now seen corresponding path program 1 times [2020-07-20 17:12:33,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:33,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [749560147] [2020-07-20 17:12:33,960 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 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:34,014 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:34,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:34,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:34,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:34,026 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 17:12:34,026 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:34,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [749560147] [2020-07-20 17:12:34,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:34,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:34,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092834162] [2020-07-20 17:12:34,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:34,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:34,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:34,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:34,029 INFO L87 Difference]: Start difference. First operand 11144 states and 13702 transitions. Second operand 3 states. [2020-07-20 17:12:34,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:34,316 INFO L93 Difference]: Finished difference Result 25228 states and 30856 transitions. [2020-07-20 17:12:34,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:34,317 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-20 17:12:34,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:34,371 INFO L225 Difference]: With dead ends: 25228 [2020-07-20 17:12:34,371 INFO L226 Difference]: Without dead ends: 14218 [2020-07-20 17:12:34,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:34,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14218 states. [2020-07-20 17:12:34,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14218 to 14216. [2020-07-20 17:12:34,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14216 states. [2020-07-20 17:12:35,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14216 states to 14216 states and 16902 transitions. [2020-07-20 17:12:35,035 INFO L78 Accepts]: Start accepts. Automaton has 14216 states and 16902 transitions. Word has length 28 [2020-07-20 17:12:35,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:35,036 INFO L479 AbstractCegarLoop]: Abstraction has 14216 states and 16902 transitions. [2020-07-20 17:12:35,036 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:35,036 INFO L276 IsEmpty]: Start isEmpty. Operand 14216 states and 16902 transitions. [2020-07-20 17:12:35,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 17:12:35,064 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:35,064 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:35,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:35,278 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:35,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:35,279 INFO L82 PathProgramCache]: Analyzing trace with hash 690414627, now seen corresponding path program 1 times [2020-07-20 17:12:35,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:35,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1428738858] [2020-07-20 17:12:35,280 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 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:35,335 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:35,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:35,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:35,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:35,353 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 17:12:35,353 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:35,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1428738858] [2020-07-20 17:12:35,354 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:35,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:35,358 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145166441] [2020-07-20 17:12:35,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:35,359 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:35,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:35,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:35,360 INFO L87 Difference]: Start difference. First operand 14216 states and 16902 transitions. Second operand 3 states. [2020-07-20 17:12:35,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:35,579 INFO L93 Difference]: Finished difference Result 21516 states and 25608 transitions. [2020-07-20 17:12:35,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:35,579 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-20 17:12:35,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:35,633 INFO L225 Difference]: With dead ends: 21516 [2020-07-20 17:12:35,633 INFO L226 Difference]: Without dead ends: 14602 [2020-07-20 17:12:35,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:35,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14602 states. [2020-07-20 17:12:36,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14602 to 14600. [2020-07-20 17:12:36,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14600 states. [2020-07-20 17:12:36,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14600 states to 14600 states and 17158 transitions. [2020-07-20 17:12:36,863 INFO L78 Accepts]: Start accepts. Automaton has 14600 states and 17158 transitions. Word has length 29 [2020-07-20 17:12:36,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:36,864 INFO L479 AbstractCegarLoop]: Abstraction has 14600 states and 17158 transitions. [2020-07-20 17:12:36,864 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:36,864 INFO L276 IsEmpty]: Start isEmpty. Operand 14600 states and 17158 transitions. [2020-07-20 17:12:36,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 17:12:36,903 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:36,903 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:37,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:37,119 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:37,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:37,120 INFO L82 PathProgramCache]: Analyzing trace with hash -320702623, now seen corresponding path program 1 times [2020-07-20 17:12:37,121 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:37,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [646344643] [2020-07-20 17:12:37,121 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 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:37,165 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:37,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:37,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:37,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:37,182 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 17:12:37,183 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:37,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [646344643] [2020-07-20 17:12:37,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:37,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:37,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859559611] [2020-07-20 17:12:37,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:37,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:37,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:37,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:37,186 INFO L87 Difference]: Start difference. First operand 14600 states and 17158 transitions. Second operand 3 states. [2020-07-20 17:12:37,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:37,510 INFO L93 Difference]: Finished difference Result 23562 states and 27399 transitions. [2020-07-20 17:12:37,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:37,510 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-20 17:12:37,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:37,606 INFO L225 Difference]: With dead ends: 23562 [2020-07-20 17:12:37,607 INFO L226 Difference]: Without dead ends: 23560 [2020-07-20 17:12:37,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:37,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23560 states. [2020-07-20 17:12:38,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23560 to 22536. [2020-07-20 17:12:38,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22536 states. [2020-07-20 17:12:38,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22536 states to 22536 states and 25862 transitions. [2020-07-20 17:12:38,281 INFO L78 Accepts]: Start accepts. Automaton has 22536 states and 25862 transitions. Word has length 29 [2020-07-20 17:12:38,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:38,281 INFO L479 AbstractCegarLoop]: Abstraction has 22536 states and 25862 transitions. [2020-07-20 17:12:38,281 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:38,281 INFO L276 IsEmpty]: Start isEmpty. Operand 22536 states and 25862 transitions. [2020-07-20 17:12:38,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 17:12:38,337 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:12:38,337 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:12:38,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:38,552 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:12:38,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:12:38,553 INFO L82 PathProgramCache]: Analyzing trace with hash -907508637, now seen corresponding path program 1 times [2020-07-20 17:12:38,553 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:12:38,553 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1157862529] [2020-07-20 17:12:38,553 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 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:38,599 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:12:38,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:12:38,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:12:38,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:12:38,622 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 17:12:38,623 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:12:38,623 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1157862529] [2020-07-20 17:12:38,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:12:38,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:12:38,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899083849] [2020-07-20 17:12:38,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:12:38,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:12:38,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:12:38,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:38,625 INFO L87 Difference]: Start difference. First operand 22536 states and 25862 transitions. Second operand 3 states. [2020-07-20 17:12:39,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:12:39,109 INFO L93 Difference]: Finished difference Result 50184 states and 56582 transitions. [2020-07-20 17:12:39,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:12:39,109 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-20 17:12:39,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:12:39,110 INFO L225 Difference]: With dead ends: 50184 [2020-07-20 17:12:39,110 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 17:12:39,206 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:12:39,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 17:12:39,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 17:12:39,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 17:12:39,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 17:12:39,208 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 29 [2020-07-20 17:12:39,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:12:39,208 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 17:12:39,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:12:39,209 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 17:12:39,209 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 17:12:39,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:12:39,429 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 17:12:39,517 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 17:12:39,517 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 17:12:39,518 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 17:12:39,518 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 17:12:39,518 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 17:12:39,518 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 17:12:39,518 INFO L271 CegarLoopResult]: At program point L159(lines 5 163) the Hoare annotation is: true [2020-07-20 17:12:39,519 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 163) no Hoare annotation was computed. [2020-07-20 17:12:39,519 INFO L268 CegarLoopResult]: For program point L118-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,519 INFO L268 CegarLoopResult]: For program point L143-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,519 INFO L268 CegarLoopResult]: For program point L102-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,520 INFO L268 CegarLoopResult]: For program point L94-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,521 INFO L268 CegarLoopResult]: For program point L119(line 119) no Hoare annotation was computed. [2020-07-20 17:12:39,521 INFO L268 CegarLoopResult]: For program point L86-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,521 INFO L268 CegarLoopResult]: For program point L144(line 144) no Hoare annotation was computed. [2020-07-20 17:12:39,521 INFO L268 CegarLoopResult]: For program point L78-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,521 INFO L268 CegarLoopResult]: For program point L70-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,522 INFO L268 CegarLoopResult]: For program point L128-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,522 INFO L271 CegarLoopResult]: At program point L153-1(lines 39 158) the Hoare annotation is: true [2020-07-20 17:12:39,522 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 163) no Hoare annotation was computed. [2020-07-20 17:12:39,522 INFO L268 CegarLoopResult]: For program point L129(line 129) no Hoare annotation was computed. [2020-07-20 17:12:39,523 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 161) no Hoare annotation was computed. [2020-07-20 17:12:39,523 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 163) the Hoare annotation is: true [2020-07-20 17:12:39,523 INFO L268 CegarLoopResult]: For program point L154(line 154) no Hoare annotation was computed. [2020-07-20 17:12:39,523 INFO L264 CegarLoopResult]: At program point L154-1(lines 5 163) the Hoare annotation is: false [2020-07-20 17:12:39,523 INFO L268 CegarLoopResult]: For program point L113-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,523 INFO L268 CegarLoopResult]: For program point L138-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,524 INFO L268 CegarLoopResult]: For program point L114(line 114) no Hoare annotation was computed. [2020-07-20 17:12:39,524 INFO L268 CegarLoopResult]: For program point L139(line 139) no Hoare annotation was computed. [2020-07-20 17:12:39,524 INFO L268 CegarLoopResult]: For program point L98-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,524 INFO L268 CegarLoopResult]: For program point L123-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,524 INFO L268 CegarLoopResult]: For program point L90-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,524 INFO L268 CegarLoopResult]: For program point L148-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,524 INFO L268 CegarLoopResult]: For program point L82-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,525 INFO L268 CegarLoopResult]: For program point L41(lines 41 43) no Hoare annotation was computed. [2020-07-20 17:12:39,525 INFO L268 CegarLoopResult]: For program point L74-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,525 INFO L268 CegarLoopResult]: For program point L66(lines 66 68) no Hoare annotation was computed. [2020-07-20 17:12:39,525 INFO L268 CegarLoopResult]: For program point L66-2(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,525 INFO L268 CegarLoopResult]: For program point L124(line 124) no Hoare annotation was computed. [2020-07-20 17:12:39,525 INFO L268 CegarLoopResult]: For program point L149(line 149) no Hoare annotation was computed. [2020-07-20 17:12:39,525 INFO L268 CegarLoopResult]: For program point L108-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,526 INFO L268 CegarLoopResult]: For program point L133-1(lines 39 158) no Hoare annotation was computed. [2020-07-20 17:12:39,526 INFO L268 CegarLoopResult]: For program point L109(line 109) no Hoare annotation was computed. [2020-07-20 17:12:39,526 INFO L268 CegarLoopResult]: For program point L134(line 134) no Hoare annotation was computed. [2020-07-20 17:12:39,553 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 05:12:39 BoogieIcfgContainer [2020-07-20 17:12:39,553 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 17:12:39,558 INFO L168 Benchmark]: Toolchain (without parser) took 19686.42 ms. Allocated memory was 144.2 MB in the beginning and 630.7 MB in the end (delta: 486.5 MB). Free memory was 102.1 MB in the beginning and 223.4 MB in the end (delta: -121.2 MB). Peak memory consumption was 365.3 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:39,559 INFO L168 Benchmark]: CDTParser took 0.61 ms. Allocated memory is still 144.2 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 17:12:39,559 INFO L168 Benchmark]: CACSL2BoogieTranslator took 443.47 ms. Allocated memory is still 144.2 MB. Free memory was 101.7 MB in the beginning and 91.2 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:39,560 INFO L168 Benchmark]: Boogie Preprocessor took 217.11 ms. Allocated memory was 144.2 MB in the beginning and 201.9 MB in the end (delta: 57.7 MB). Free memory was 91.2 MB in the beginning and 179.5 MB in the end (delta: -88.3 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:39,560 INFO L168 Benchmark]: RCFGBuilder took 586.14 ms. Allocated memory is still 201.9 MB. Free memory was 179.5 MB in the beginning and 160.4 MB in the end (delta: 19.1 MB). Peak memory consumption was 19.1 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:39,561 INFO L168 Benchmark]: TraceAbstraction took 18427.21 ms. Allocated memory was 201.9 MB in the beginning and 630.7 MB in the end (delta: 428.9 MB). Free memory was 159.7 MB in the beginning and 223.4 MB in the end (delta: -63.6 MB). Peak memory consumption was 365.2 MB. Max. memory is 7.1 GB. [2020-07-20 17:12:39,563 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.61 ms. Allocated memory is still 144.2 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 443.47 ms. Allocated memory is still 144.2 MB. Free memory was 101.7 MB in the beginning and 91.2 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 217.11 ms. Allocated memory was 144.2 MB in the beginning and 201.9 MB in the end (delta: 57.7 MB). Free memory was 91.2 MB in the beginning and 179.5 MB in the end (delta: -88.3 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 586.14 ms. Allocated memory is still 201.9 MB. Free memory was 179.5 MB in the beginning and 160.4 MB in the end (delta: 19.1 MB). Peak memory consumption was 19.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 18427.21 ms. Allocated memory was 201.9 MB in the beginning and 630.7 MB in the end (delta: 428.9 MB). Free memory was 159.7 MB in the beginning and 223.4 MB in the end (delta: -63.6 MB). Peak memory consumption was 365.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 161]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 39]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 44 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 18.1s, OverallIterations: 28, TraceHistogramMax: 1, AutomataDifference: 4.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 2384 SDtfs, 1153 SDslu, 1624 SDs, 0 SdLazy, 149 SolverSat, 28 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 659 GetRequests, 631 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22536occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 4.8s AutomataMinimizationTime, 28 MinimizatonAttempts, 4124 StatesRemovedByMinimization, 27 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 1034 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.9s SatisfiabilityAnalysisTime, 0.6s InterpolantComputationTime, 687 NumberOfCodeBlocks, 684 NumberOfCodeBlocksAsserted, 111 NumberOfCheckSat, 659 ConstructedInterpolants, 0 QuantifiedInterpolants, 31265 SizeOfPredicates, 0 NumberOfNonLiveVariables, 3125 ConjunctsInSsa, 84 ConjunctsInUnsatCore, 28 InterpolantComputations, 28 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...