/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+lh-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 14:17:56,196 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 14:17:56,198 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 14:17:56,212 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 14:17:56,212 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 14:17:56,213 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 14:17:56,215 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 14:17:56,216 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 14:17:56,218 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 14:17:56,219 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 14:17:56,220 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 14:17:56,221 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 14:17:56,221 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 14:17:56,222 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 14:17:56,224 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 14:17:56,225 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 14:17:56,229 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 14:17:56,230 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 14:17:56,231 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 14:17:56,238 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 14:17:56,240 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 14:17:56,241 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 14:17:56,242 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 14:17:56,243 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 14:17:56,245 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 14:17:56,253 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 14:17:56,253 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 14:17:56,254 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 14:17:56,255 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 14:17:56,269 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 14:17:56,270 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 14:17:56,271 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 14:17:56,271 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 14:17:56,271 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 14:17:56,272 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 14:17:56,272 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 14:17:56,272 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 14:17:56,272 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 14:17:56,272 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 14:17:56,273 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 14:17:56,273 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 14:17:56,273 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 14:17:56,273 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 14:17:56,273 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 14:17:56,274 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 14:17:56,274 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 14:17:56,274 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 14:17:56,274 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 14:17:56,274 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 14:17:56,274 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 14:17:56,275 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 14:17:56,275 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 14:17:56,275 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 14:17:56,275 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 14:17:56,276 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 14:17:56,276 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:56,276 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 14:17:56,276 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 14:17:56,276 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 14:17:56,604 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 14:17:56,620 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 14:17:56,625 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 14:17:56,626 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 14:17:56,629 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 14:17:56,631 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+lh-reducer.c [2020-07-21 14:17:56,711 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5a8352e80/5ac051b4d94741ceb3142bb403f6fff5/FLAGe102c15a0 [2020-07-21 14:17:57,274 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 14:17:57,274 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+lh-reducer.c [2020-07-21 14:17:57,284 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5a8352e80/5ac051b4d94741ceb3142bb403f6fff5/FLAGe102c15a0 [2020-07-21 14:17:57,511 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5a8352e80/5ac051b4d94741ceb3142bb403f6fff5 [2020-07-21 14:17:57,521 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 14:17:57,524 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 14:17:57,525 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 14:17:57,525 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 14:17:57,529 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 14:17:57,530 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:17:57" (1/1) ... [2020-07-21 14:17:57,533 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ba4f459 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:57, skipping insertion in model container [2020-07-21 14:17:57,534 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:17:57" (1/1) ... [2020-07-21 14:17:57,543 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 14:17:57,573 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 14:17:57,857 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:17:57,869 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 14:17:58,128 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:17:58,149 INFO L208 MainTranslator]: Completed translation [2020-07-21 14:17:58,150 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:58 WrapperNode [2020-07-21 14:17:58,150 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 14:17:58,151 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 14:17:58,151 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 14:17:58,151 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 14:17:58,163 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:58" (1/1) ... [2020-07-21 14:17:58,164 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:58" (1/1) ... [2020-07-21 14:17:58,182 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:58" (1/1) ... [2020-07-21 14:17:58,182 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:58" (1/1) ... [2020-07-21 14:17:58,215 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:58" (1/1) ... [2020-07-21 14:17:58,220 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:58" (1/1) ... [2020-07-21 14:17:58,224 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:58" (1/1) ... [2020-07-21 14:17:58,230 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 14:17:58,230 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 14:17:58,231 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 14:17:58,231 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 14:17:58,232 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:58" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 14:17:58,303 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 14:17:58,303 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 14:17:58,303 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 14:17:58,303 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 14:17:58,304 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_89 [2020-07-21 14:17:58,304 INFO L130 BoogieDeclarations]: Found specification of procedure fopen [2020-07-21 14:17:58,304 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 14:17:58,304 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 14:17:58,304 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 14:17:58,305 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 14:17:58,305 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-21 14:17:58,305 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-07-21 14:17:58,305 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 14:17:58,305 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 14:17:58,305 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 14:17:58,306 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 14:17:58,306 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-21 14:18:01,038 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 14:18:01,039 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 14:18:01,047 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:18:01 BoogieIcfgContainer [2020-07-21 14:18:01,047 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 14:18:01,049 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 14:18:01,049 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 14:18:01,053 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 14:18:01,054 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 02:17:57" (1/3) ... [2020-07-21 14:18:01,055 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@758e36fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:18:01, skipping insertion in model container [2020-07-21 14:18:01,055 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:58" (2/3) ... [2020-07-21 14:18:01,057 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@758e36fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:18:01, skipping insertion in model container [2020-07-21 14:18:01,057 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:18:01" (3/3) ... [2020-07-21 14:18:01,059 INFO L109 eAbstractionObserver]: Analyzing ICFG aiob_4.c.v+lh-reducer.c [2020-07-21 14:18:01,071 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 14:18:01,082 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 14:18:01,098 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 14:18:01,126 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 14:18:01,126 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 14:18:01,127 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 14:18:01,127 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 14:18:01,127 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 14:18:01,128 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 14:18:01,128 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 14:18:01,128 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 14:18:01,149 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-07-21 14:18:01,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 14:18:01,157 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:18:01,158 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:18:01,159 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:18:01,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:18:01,166 INFO L82 PathProgramCache]: Analyzing trace with hash 1960518123, now seen corresponding path program 1 times [2020-07-21 14:18:01,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:18:01,174 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [730822433] [2020-07-21 14:18:01,174 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:18:04,025 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:18:04,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:18:04,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 14:18:04,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:18:04,097 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:18:04,098 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:18:04,102 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [730822433] [2020-07-21 14:18:04,103 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:18:04,103 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 14:18:04,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912093970] [2020-07-21 14:18:04,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 14:18:04,112 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:18:04,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 14:18:04,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 14:18:04,130 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 4 states. [2020-07-21 14:18:04,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:18:04,219 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-07-21 14:18:04,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 14:18:04,221 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-07-21 14:18:04,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:18:04,231 INFO L225 Difference]: With dead ends: 38 [2020-07-21 14:18:04,232 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 14:18:04,235 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 14:18:04,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 14:18:04,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-07-21 14:18:04,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 14:18:04,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-07-21 14:18:04,277 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 12 [2020-07-21 14:18:04,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:18:04,278 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-07-21 14:18:04,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 14:18:04,278 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-07-21 14:18:04,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 14:18:04,279 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:18:04,279 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:18:04,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:18:04,495 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:18:04,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:18:04,496 INFO L82 PathProgramCache]: Analyzing trace with hash 1182240945, now seen corresponding path program 1 times [2020-07-21 14:18:04,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:18:04,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [817905660] [2020-07-21 14:18:04,497 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:18:13,289 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:18:13,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:18:13,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 14:18:13,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:18:13,363 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:18:13,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:18:13,420 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:18:13,421 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [817905660] [2020-07-21 14:18:13,421 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:18:13,422 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-21 14:18:13,422 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815987622] [2020-07-21 14:18:13,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 14:18:13,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:18:13,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 14:18:13,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-07-21 14:18:13,426 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 8 states. [2020-07-21 14:18:15,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:18:15,715 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-07-21 14:18:15,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 14:18:15,716 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2020-07-21 14:18:15,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:18:15,717 INFO L225 Difference]: With dead ends: 38 [2020-07-21 14:18:15,717 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 14:18:15,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2020-07-21 14:18:15,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 14:18:15,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2020-07-21 14:18:15,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 14:18:15,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-07-21 14:18:15,739 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 17 [2020-07-21 14:18:15,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:18:15,739 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-07-21 14:18:15,740 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 14:18:15,740 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-07-21 14:18:15,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-21 14:18:15,741 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:18:15,742 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:18:15,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:18:15,943 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:18:15,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:18:15,943 INFO L82 PathProgramCache]: Analyzing trace with hash 1890060651, now seen corresponding path program 2 times [2020-07-21 14:18:15,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:18:15,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [585560821] [2020-07-21 14:18:15,944 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:18:31,083 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:18:31,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:18:31,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 14:18:31,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:18:31,461 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:18:31,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:18:31,584 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:18:31,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [585560821] [2020-07-21 14:18:31,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:18:31,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-07-21 14:18:31,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460880391] [2020-07-21 14:18:31,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 14:18:31,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:18:31,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 14:18:31,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2020-07-21 14:18:31,588 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 14 states. [2020-07-21 14:18:46,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:18:46,760 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2020-07-21 14:18:46,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 14:18:46,761 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-07-21 14:18:46,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:18:46,762 INFO L225 Difference]: With dead ends: 68 [2020-07-21 14:18:46,763 INFO L226 Difference]: Without dead ends: 65 [2020-07-21 14:18:46,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=192, Invalid=456, Unknown=2, NotChecked=0, Total=650 [2020-07-21 14:18:46,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-21 14:18:46,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2020-07-21 14:18:46,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-07-21 14:18:46,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-07-21 14:18:46,775 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 32 [2020-07-21 14:18:46,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:18:46,776 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-07-21 14:18:46,776 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 14:18:46,776 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-07-21 14:18:46,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-21 14:18:46,778 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:18:46,778 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:18:46,993 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:18:46,995 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:18:46,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:18:46,996 INFO L82 PathProgramCache]: Analyzing trace with hash 1772338347, now seen corresponding path program 3 times [2020-07-21 14:18:46,996 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:18:46,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [986212743] [2020-07-21 14:18:46,997 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:19:16,104 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:19:16,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:19:17,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 14:19:17,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:19:17,513 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:19:17,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:19:24,254 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:19:24,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [986212743] [2020-07-21 14:19:24,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:19:24,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2020-07-21 14:19:24,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687881440] [2020-07-21 14:19:24,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 14:19:24,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:19:24,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 14:19:24,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=476, Unknown=3, NotChecked=0, Total=650 [2020-07-21 14:19:24,258 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 26 states. [2020-07-21 14:19:46,083 WARN L193 SmtUtils]: Spent 810.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2020-07-21 14:19:47,097 WARN L193 SmtUtils]: Spent 750.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 15 [2020-07-21 14:19:50,021 WARN L193 SmtUtils]: Spent 342.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 15 [2020-07-21 14:19:53,722 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 15 [2020-07-21 14:19:58,511 WARN L193 SmtUtils]: Spent 2.39 s on a formula simplification. DAG size of input: 45 DAG size of output: 15 [2020-07-21 14:20:05,749 WARN L193 SmtUtils]: Spent 2.12 s on a formula simplification. DAG size of input: 35 DAG size of output: 15 [2020-07-21 14:20:12,425 WARN L193 SmtUtils]: Spent 2.16 s on a formula simplification. DAG size of input: 30 DAG size of output: 15 [2020-07-21 14:20:12,967 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 15 [2020-07-21 14:20:19,384 WARN L193 SmtUtils]: Spent 2.12 s on a formula simplification. DAG size of input: 20 DAG size of output: 15 [2020-07-21 14:20:25,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:20:25,854 INFO L93 Difference]: Finished difference Result 128 states and 139 transitions. [2020-07-21 14:20:25,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-21 14:20:25,860 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 62 [2020-07-21 14:20:25,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:20:25,862 INFO L225 Difference]: With dead ends: 128 [2020-07-21 14:20:25,862 INFO L226 Difference]: Without dead ends: 125 [2020-07-21 14:20:25,864 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 43.3s TimeCoverageRelationStatistics Valid=665, Invalid=1779, Unknown=6, NotChecked=0, Total=2450 [2020-07-21 14:20:25,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-07-21 14:20:25,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2020-07-21 14:20:25,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-07-21 14:20:25,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2020-07-21 14:20:25,881 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 62 [2020-07-21 14:20:25,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:20:25,882 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2020-07-21 14:20:25,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 14:20:25,882 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2020-07-21 14:20:25,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-07-21 14:20:25,887 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:20:25,887 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:20:26,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:20:26,104 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:20:26,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:20:26,105 INFO L82 PathProgramCache]: Analyzing trace with hash -357330133, now seen corresponding path program 4 times [2020-07-21 14:20:26,106 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:20:26,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1620574517] [2020-07-21 14:20:26,107 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:22:00,368 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:22:00,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:22:06,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 887 conjuncts, 49 conjunts are in the unsatisfiable core [2020-07-21 14:22:06,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:22:07,170 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 0 proven. 1221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:22:07,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:22:40,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 0 proven. 1181 refuted. 40 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:22:40,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1620574517] [2020-07-21 14:22:40,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:22:40,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2020-07-21 14:22:40,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192767824] [2020-07-21 14:22:40,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 14:22:40,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:22:40,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 14:22:40,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=621, Invalid=1814, Unknown=15, NotChecked=0, Total=2450 [2020-07-21 14:22:40,376 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 50 states. [2020-07-21 14:23:02,191 WARN L193 SmtUtils]: Spent 3.91 s on a formula simplification. DAG size of input: 99 DAG size of output: 14 [2020-07-21 14:23:05,318 WARN L193 SmtUtils]: Spent 1.19 s on a formula simplification. DAG size of input: 100 DAG size of output: 15 [2020-07-21 14:23:09,353 WARN L193 SmtUtils]: Spent 764.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 15 [2020-07-21 14:23:16,353 WARN L193 SmtUtils]: Spent 1.12 s on a formula simplification. DAG size of input: 90 DAG size of output: 15 [2020-07-21 14:23:28,484 WARN L193 SmtUtils]: Spent 975.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 15 [2020-07-21 14:23:38,188 WARN L193 SmtUtils]: Spent 4.50 s on a formula simplification. DAG size of input: 80 DAG size of output: 20 [2020-07-21 14:23:43,411 WARN L193 SmtUtils]: Spent 1.12 s on a formula simplification. DAG size of input: 75 DAG size of output: 15 [2020-07-21 14:23:53,953 WARN L193 SmtUtils]: Spent 338.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 15 [2020-07-21 14:24:08,056 WARN L193 SmtUtils]: Spent 642.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 15 [2020-07-21 14:24:12,376 WARN L193 SmtUtils]: Spent 540.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 15 [2020-07-21 14:24:19,179 WARN L193 SmtUtils]: Spent 490.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 15 [2020-07-21 14:24:30,517 WARN L193 SmtUtils]: Spent 4.72 s on a formula simplification. DAG size of input: 50 DAG size of output: 15 [2020-07-21 14:24:36,340 WARN L193 SmtUtils]: Spent 325.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 15 [2020-07-21 14:24:53,909 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 15 [2020-07-21 14:25:02,867 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 15 [2020-07-21 14:25:08,835 WARN L193 SmtUtils]: Spent 2.25 s on a formula simplification. DAG size of input: 30 DAG size of output: 15 [2020-07-21 14:25:25,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:25:25,605 INFO L93 Difference]: Finished difference Result 228 states and 247 transitions. [2020-07-21 14:25:25,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-07-21 14:25:25,607 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 122 [2020-07-21 14:25:25,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:25:25,611 INFO L225 Difference]: With dead ends: 228 [2020-07-21 14:25:25,612 INFO L226 Difference]: Without dead ends: 225 [2020-07-21 14:25:25,616 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 196 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1070 ImplicationChecksByTransitivity, 178.9s TimeCoverageRelationStatistics Valid=2176, Invalid=6537, Unknown=29, NotChecked=0, Total=8742 [2020-07-21 14:25:25,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-21 14:25:25,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 223. [2020-07-21 14:25:25,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2020-07-21 14:25:25,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 223 transitions. [2020-07-21 14:25:25,644 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 223 transitions. Word has length 122 [2020-07-21 14:25:25,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:25:25,645 INFO L479 AbstractCegarLoop]: Abstraction has 223 states and 223 transitions. [2020-07-21 14:25:25,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 14:25:25,645 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 223 transitions. [2020-07-21 14:25:25,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2020-07-21 14:25:25,650 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:25:25,651 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:25:25,866 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:25:25,867 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:25:25,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:25:25,868 INFO L82 PathProgramCache]: Analyzing trace with hash -576259925, now seen corresponding path program 5 times [2020-07-21 14:25:25,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:25:25,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [72139835] [2020-07-21 14:25:25,870 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:31:06,327 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:31:06,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:31:18,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 1327 conjuncts, 118 conjunts are in the unsatisfiable core [2020-07-21 14:31:18,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:31:20,961 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2020-07-21 14:31:20,962 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-21 14:31:20,972 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-21 14:31:20,973 INFO L544 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-21 14:31:20,973 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:19, output treesize:3 [2020-07-21 14:31:21,240 INFO L134 CoverageAnalysis]: Checked inductivity of 4431 backedges. 126 proven. 4305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:31:21,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:31:21,363 INFO L320 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-07-21 14:31:21,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:32:06,785 INFO L134 CoverageAnalysis]: Checked inductivity of 4431 backedges. 126 proven. 4300 refuted. 5 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:32:06,785 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [72139835] [2020-07-21 14:32:06,785 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:32:06,786 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 47] total 91 [2020-07-21 14:32:06,786 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112430196] [2020-07-21 14:32:06,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2020-07-21 14:32:06,787 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:32:06,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2020-07-21 14:32:06,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1086, Invalid=7088, Unknown=16, NotChecked=0, Total=8190 [2020-07-21 14:32:06,798 INFO L87 Difference]: Start difference. First operand 223 states and 223 transitions. Second operand 91 states.