/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -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 [2020-07-21 19:52:36,149 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:52:36,153 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:52:36,174 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:52:36,175 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:52:36,177 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:52:36,179 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:52:36,181 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:52:36,183 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:52:36,185 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:52:36,186 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:52:36,188 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:52:36,188 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:52:36,190 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:52:36,191 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:52:36,193 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:52:36,194 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:52:36,196 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:52:36,199 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:52:36,201 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:52:36,203 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:52:36,205 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:52:36,206 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:52:36,207 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:52:36,211 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 19:52:36,211 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 19:52:36,212 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 19:52:36,213 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 19:52:36,213 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 19:52:36,215 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 19:52:36,215 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 19:52:36,216 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 19:52:36,216 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 19:52:36,218 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 19:52:36,219 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 19:52:36,219 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 19:52:36,221 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 19:52:36,221 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 19:52:36,221 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:52:36,222 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:52:36,223 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:52:36,224 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 19:52:36,242 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:52:36,242 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:52:36,244 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:52:36,244 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:52:36,244 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:52:36,245 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:52:36,245 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:52:36,245 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:52:36,245 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:52:36,246 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:52:36,246 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:52:36,246 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:52:36,246 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:52:36,246 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:52:36,247 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:52:36,247 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:52:36,247 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:52:36,247 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:52:36,247 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:52:36,248 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:52:36,248 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:52:36,248 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:52:36,248 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:52:36,248 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:52:36,249 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:52:36,249 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:52:36,249 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:36,249 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:52:36,249 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:52:36,250 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 19:52:36,579 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:52:36,596 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:52:36,601 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:52:36,604 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:52:36,604 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:52:36,605 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_10.c [2020-07-21 19:52:36,689 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/61e40a893/f6fb68997ed74300a777b14f232ba3ae/FLAGed46fb406 [2020-07-21 19:52:37,272 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:52:37,273 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_10.c [2020-07-21 19:52:37,284 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/61e40a893/f6fb68997ed74300a777b14f232ba3ae/FLAGed46fb406 [2020-07-21 19:52:37,598 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/61e40a893/f6fb68997ed74300a777b14f232ba3ae [2020-07-21 19:52:37,615 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:52:37,619 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:52:37,621 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:52:37,621 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:52:37,626 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:52:37,628 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:52:37" (1/1) ... [2020-07-21 19:52:37,632 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@a7e8a53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:37, skipping insertion in model container [2020-07-21 19:52:37,632 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:52:37" (1/1) ... [2020-07-21 19:52:37,643 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:52:37,671 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:52:37,960 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:52:37,967 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:52:37,996 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:52:38,020 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:52:38,021 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:38 WrapperNode [2020-07-21 19:52:38,021 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:52:38,022 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:52:38,023 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:52:38,023 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:52:38,134 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:38" (1/1) ... [2020-07-21 19:52:38,134 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:38" (1/1) ... [2020-07-21 19:52:38,144 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:38" (1/1) ... [2020-07-21 19:52:38,144 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:38" (1/1) ... [2020-07-21 19:52:38,152 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:38" (1/1) ... [2020-07-21 19:52:38,162 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:38" (1/1) ... [2020-07-21 19:52:38,165 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:38" (1/1) ... [2020-07-21 19:52:38,168 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:52:38,169 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:52:38,169 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:52:38,170 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:52:38,171 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:38" (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 19:52:38,278 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:52:38,278 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:52:38,279 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:52:38,279 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:52:38,280 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:52:38,281 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:52:38,281 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:52:38,281 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:52:38,670 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:52:38,670 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 19:52:38,678 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:52:38 BoogieIcfgContainer [2020-07-21 19:52:38,678 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:52:38,696 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:52:38,696 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:52:38,707 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:52:38,707 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:52:37" (1/3) ... [2020-07-21 19:52:38,712 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43e1f779 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:52:38, skipping insertion in model container [2020-07-21 19:52:38,713 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:38" (2/3) ... [2020-07-21 19:52:38,713 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43e1f779 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:52:38, skipping insertion in model container [2020-07-21 19:52:38,713 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:52:38" (3/3) ... [2020-07-21 19:52:38,716 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_10.c [2020-07-21 19:52:38,760 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:52:38,771 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:52:38,787 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:52:38,816 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:52:38,816 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:52:38,817 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:52:38,817 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:52:38,817 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:52:38,818 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:52:38,818 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:52:38,818 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:52:38,840 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2020-07-21 19:52:38,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 19:52:38,847 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:38,849 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] [2020-07-21 19:52:38,849 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:38,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:38,855 INFO L82 PathProgramCache]: Analyzing trace with hash -917347053, now seen corresponding path program 1 times [2020-07-21 19:52:38,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:38,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1900248432] [2020-07-21 19:52:38,865 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 19:52:38,993 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:38,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:38,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:39,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:39,067 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 19:52:39,067 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:39,069 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1900248432] [2020-07-21 19:52:39,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:39,070 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:39,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834459979] [2020-07-21 19:52:39,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:39,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:39,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:39,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:39,095 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 3 states. [2020-07-21 19:52:39,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:39,170 INFO L93 Difference]: Finished difference Result 87 states and 150 transitions. [2020-07-21 19:52:39,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:39,174 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 19:52:39,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:39,189 INFO L225 Difference]: With dead ends: 87 [2020-07-21 19:52:39,190 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 19:52:39,195 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 [2020-07-21 19:52:39,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 19:52:39,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-21 19:52:39,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 19:52:39,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 89 transitions. [2020-07-21 19:52:39,260 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 89 transitions. Word has length 20 [2020-07-21 19:52:39,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:39,261 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 89 transitions. [2020-07-21 19:52:39,261 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:39,262 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 89 transitions. [2020-07-21 19:52:39,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 19:52:39,263 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:39,263 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] [2020-07-21 19:52:39,478 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:39,479 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:39,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:39,479 INFO L82 PathProgramCache]: Analyzing trace with hash -1504153067, now seen corresponding path program 1 times [2020-07-21 19:52:39,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:39,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [902459542] [2020-07-21 19:52:39,481 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 19:52:39,587 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:39,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:39,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:39,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:39,604 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 19:52:39,604 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:39,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [902459542] [2020-07-21 19:52:39,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:39,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:39,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915254305] [2020-07-21 19:52:39,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:39,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:39,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:39,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:39,610 INFO L87 Difference]: Start difference. First operand 50 states and 89 transitions. Second operand 3 states. [2020-07-21 19:52:39,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:39,643 INFO L93 Difference]: Finished difference Result 117 states and 212 transitions. [2020-07-21 19:52:39,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:39,644 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 19:52:39,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:39,647 INFO L225 Difference]: With dead ends: 117 [2020-07-21 19:52:39,647 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 19:52:39,649 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 [2020-07-21 19:52:39,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 19:52:39,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2020-07-21 19:52:39,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 19:52:39,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 125 transitions. [2020-07-21 19:52:39,663 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 125 transitions. Word has length 20 [2020-07-21 19:52:39,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:39,664 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 125 transitions. [2020-07-21 19:52:39,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:39,664 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 125 transitions. [2020-07-21 19:52:39,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 19:52:39,666 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:39,666 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] [2020-07-21 19:52:39,872 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:39,873 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:39,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:39,874 INFO L82 PathProgramCache]: Analyzing trace with hash 1627225809, now seen corresponding path program 1 times [2020-07-21 19:52:39,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:39,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [378275486] [2020-07-21 19:52:39,876 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 19:52:39,934 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:39,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:39,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:39,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:39,961 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 19:52:39,963 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:39,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [378275486] [2020-07-21 19:52:39,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:39,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:39,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323933857] [2020-07-21 19:52:39,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:39,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:39,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:39,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:39,969 INFO L87 Difference]: Start difference. First operand 70 states and 125 transitions. Second operand 3 states. [2020-07-21 19:52:40,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:40,010 INFO L93 Difference]: Finished difference Result 108 states and 189 transitions. [2020-07-21 19:52:40,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:40,011 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 19:52:40,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:40,013 INFO L225 Difference]: With dead ends: 108 [2020-07-21 19:52:40,013 INFO L226 Difference]: Without dead ends: 75 [2020-07-21 19:52:40,015 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 [2020-07-21 19:52:40,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-21 19:52:40,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2020-07-21 19:52:40,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-21 19:52:40,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 127 transitions. [2020-07-21 19:52:40,029 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 127 transitions. Word has length 21 [2020-07-21 19:52:40,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:40,030 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 127 transitions. [2020-07-21 19:52:40,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:40,031 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 127 transitions. [2020-07-21 19:52:40,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 19:52:40,032 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:40,032 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] [2020-07-21 19:52:40,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:40,246 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:40,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:40,247 INFO L82 PathProgramCache]: Analyzing trace with hash 616108559, now seen corresponding path program 1 times [2020-07-21 19:52:40,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:40,249 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [221358748] [2020-07-21 19:52:40,249 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 19:52:40,303 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:40,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:40,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:40,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:40,332 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 19:52:40,332 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:40,333 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [221358748] [2020-07-21 19:52:40,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:40,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:40,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349197678] [2020-07-21 19:52:40,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:40,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:40,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:40,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:40,337 INFO L87 Difference]: Start difference. First operand 73 states and 127 transitions. Second operand 3 states. [2020-07-21 19:52:40,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:40,378 INFO L93 Difference]: Finished difference Result 136 states and 240 transitions. [2020-07-21 19:52:40,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:40,379 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 19:52:40,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:40,381 INFO L225 Difference]: With dead ends: 136 [2020-07-21 19:52:40,381 INFO L226 Difference]: Without dead ends: 134 [2020-07-21 19:52:40,383 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 [2020-07-21 19:52:40,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2020-07-21 19:52:40,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 96. [2020-07-21 19:52:40,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-21 19:52:40,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 168 transitions. [2020-07-21 19:52:40,399 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 168 transitions. Word has length 21 [2020-07-21 19:52:40,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:40,399 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 168 transitions. [2020-07-21 19:52:40,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:40,400 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 168 transitions. [2020-07-21 19:52:40,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 19:52:40,401 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:40,402 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] [2020-07-21 19:52:40,617 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:40,618 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:40,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:40,619 INFO L82 PathProgramCache]: Analyzing trace with hash 29302545, now seen corresponding path program 1 times [2020-07-21 19:52:40,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:40,621 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251633039] [2020-07-21 19:52:40,621 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 19:52:40,702 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:40,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:40,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:40,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:40,716 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 19:52:40,716 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:40,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1251633039] [2020-07-21 19:52:40,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:40,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:40,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [809584301] [2020-07-21 19:52:40,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:40,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:40,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:40,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:40,719 INFO L87 Difference]: Start difference. First operand 96 states and 168 transitions. Second operand 3 states. [2020-07-21 19:52:40,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:40,749 INFO L93 Difference]: Finished difference Result 224 states and 398 transitions. [2020-07-21 19:52:40,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:40,750 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 19:52:40,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:40,752 INFO L225 Difference]: With dead ends: 224 [2020-07-21 19:52:40,752 INFO L226 Difference]: Without dead ends: 136 [2020-07-21 19:52:40,754 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 [2020-07-21 19:52:40,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-21 19:52:40,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 134. [2020-07-21 19:52:40,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-07-21 19:52:40,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 234 transitions. [2020-07-21 19:52:40,776 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 234 transitions. Word has length 21 [2020-07-21 19:52:40,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:40,777 INFO L479 AbstractCegarLoop]: Abstraction has 134 states and 234 transitions. [2020-07-21 19:52:40,777 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:40,777 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 234 transitions. [2020-07-21 19:52:40,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 19:52:40,779 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:40,779 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] [2020-07-21 19:52:40,986 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:40,987 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:40,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:40,989 INFO L82 PathProgramCache]: Analyzing trace with hash 1919709866, now seen corresponding path program 1 times [2020-07-21 19:52:40,989 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:40,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [492404151] [2020-07-21 19:52:40,990 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 19:52:41,037 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:41,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:41,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:41,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:41,059 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 19:52:41,061 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:41,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [492404151] [2020-07-21 19:52:41,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:41,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:41,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877306699] [2020-07-21 19:52:41,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:41,064 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:41,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:41,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:41,065 INFO L87 Difference]: Start difference. First operand 134 states and 234 transitions. Second operand 3 states. [2020-07-21 19:52:41,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:41,096 INFO L93 Difference]: Finished difference Result 201 states and 349 transitions. [2020-07-21 19:52:41,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:41,097 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 19:52:41,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:41,099 INFO L225 Difference]: With dead ends: 201 [2020-07-21 19:52:41,100 INFO L226 Difference]: Without dead ends: 138 [2020-07-21 19:52:41,101 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 [2020-07-21 19:52:41,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-21 19:52:41,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2020-07-21 19:52:41,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 19:52:41,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 234 transitions. [2020-07-21 19:52:41,115 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 234 transitions. Word has length 22 [2020-07-21 19:52:41,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:41,115 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 234 transitions. [2020-07-21 19:52:41,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:41,116 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 234 transitions. [2020-07-21 19:52:41,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 19:52:41,118 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:41,118 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] [2020-07-21 19:52:41,333 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:41,334 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:41,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:41,334 INFO L82 PathProgramCache]: Analyzing trace with hash 908592616, now seen corresponding path program 1 times [2020-07-21 19:52:41,334 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:41,334 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [773498784] [2020-07-21 19:52:41,335 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:41,382 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:41,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:41,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:41,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:41,399 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 19:52:41,399 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:41,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [773498784] [2020-07-21 19:52:41,400 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:41,400 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:41,400 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360873492] [2020-07-21 19:52:41,401 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:41,401 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:41,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:41,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:41,402 INFO L87 Difference]: Start difference. First operand 136 states and 234 transitions. Second operand 3 states. [2020-07-21 19:52:41,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:41,425 INFO L93 Difference]: Finished difference Result 252 states and 440 transitions. [2020-07-21 19:52:41,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:41,426 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 19:52:41,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:41,429 INFO L225 Difference]: With dead ends: 252 [2020-07-21 19:52:41,429 INFO L226 Difference]: Without dead ends: 250 [2020-07-21 19:52:41,430 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 [2020-07-21 19:52:41,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-21 19:52:41,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 184. [2020-07-21 19:52:41,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-07-21 19:52:41,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 314 transitions. [2020-07-21 19:52:41,447 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 314 transitions. Word has length 22 [2020-07-21 19:52:41,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:41,448 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 314 transitions. [2020-07-21 19:52:41,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:41,448 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 314 transitions. [2020-07-21 19:52:41,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 19:52:41,450 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:41,450 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] [2020-07-21 19:52:41,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:41,667 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:41,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:41,668 INFO L82 PathProgramCache]: Analyzing trace with hash 321786602, now seen corresponding path program 1 times [2020-07-21 19:52:41,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:41,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [898845156] [2020-07-21 19:52:41,669 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:41,710 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:41,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:41,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:41,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:41,725 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 19:52:41,728 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:41,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [898845156] [2020-07-21 19:52:41,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:41,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:41,730 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669461193] [2020-07-21 19:52:41,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:41,731 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:41,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:41,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:41,733 INFO L87 Difference]: Start difference. First operand 184 states and 314 transitions. Second operand 3 states. [2020-07-21 19:52:41,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:41,764 INFO L93 Difference]: Finished difference Result 432 states and 744 transitions. [2020-07-21 19:52:41,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:41,764 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 19:52:41,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:41,766 INFO L225 Difference]: With dead ends: 432 [2020-07-21 19:52:41,767 INFO L226 Difference]: Without dead ends: 258 [2020-07-21 19:52:41,769 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 [2020-07-21 19:52:41,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-07-21 19:52:41,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 256. [2020-07-21 19:52:41,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-21 19:52:41,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 434 transitions. [2020-07-21 19:52:41,789 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 434 transitions. Word has length 22 [2020-07-21 19:52:41,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:41,790 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 434 transitions. [2020-07-21 19:52:41,790 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:41,790 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 434 transitions. [2020-07-21 19:52:41,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 19:52:41,792 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:41,793 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] [2020-07-21 19:52:42,008 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:42,009 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:42,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:42,010 INFO L82 PathProgramCache]: Analyzing trace with hash -1898185914, now seen corresponding path program 1 times [2020-07-21 19:52:42,011 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:42,011 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1256097912] [2020-07-21 19:52:42,012 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 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 [2020-07-21 19:52:42,045 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:52:42,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:42,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:42,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:42,061 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 19:52:42,061 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:42,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1256097912] [2020-07-21 19:52:42,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:42,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:42,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934584822] [2020-07-21 19:52:42,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:42,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:42,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:42,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:42,064 INFO L87 Difference]: Start difference. First operand 256 states and 434 transitions. Second operand 3 states. [2020-07-21 19:52:42,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:42,096 INFO L93 Difference]: Finished difference Result 472 states and 812 transitions. [2020-07-21 19:52:42,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:42,097 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 19:52:42,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:42,100 INFO L225 Difference]: With dead ends: 472 [2020-07-21 19:52:42,101 INFO L226 Difference]: Without dead ends: 470 [2020-07-21 19:52:42,102 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 [2020-07-21 19:52:42,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2020-07-21 19:52:42,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 356. [2020-07-21 19:52:42,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 356 states. [2020-07-21 19:52:42,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 356 states to 356 states and 594 transitions. [2020-07-21 19:52:42,121 INFO L78 Accepts]: Start accepts. Automaton has 356 states and 594 transitions. Word has length 23 [2020-07-21 19:52:42,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:42,121 INFO L479 AbstractCegarLoop]: Abstraction has 356 states and 594 transitions. [2020-07-21 19:52:42,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:42,121 INFO L276 IsEmpty]: Start isEmpty. Operand 356 states and 594 transitions. [2020-07-21 19:52:42,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 19:52:42,124 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:42,124 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] [2020-07-21 19:52:42,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:42,339 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:42,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:42,340 INFO L82 PathProgramCache]: Analyzing trace with hash 1809975368, now seen corresponding path program 1 times [2020-07-21 19:52:42,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:42,341 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [237751386] [2020-07-21 19:52:42,341 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 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 [2020-07-21 19:52:42,385 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:42,385 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:42,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:42,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:42,417 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 19:52:42,418 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:42,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [237751386] [2020-07-21 19:52:42,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:42,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:42,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460564230] [2020-07-21 19:52:42,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:42,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:42,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:42,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:42,421 INFO L87 Difference]: Start difference. First operand 356 states and 594 transitions. Second operand 3 states. [2020-07-21 19:52:42,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:42,452 INFO L93 Difference]: Finished difference Result 532 states and 884 transitions. [2020-07-21 19:52:42,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:42,453 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 19:52:42,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:42,457 INFO L225 Difference]: With dead ends: 532 [2020-07-21 19:52:42,457 INFO L226 Difference]: Without dead ends: 362 [2020-07-21 19:52:42,460 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 [2020-07-21 19:52:42,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2020-07-21 19:52:42,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 360. [2020-07-21 19:52:42,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 360 states. [2020-07-21 19:52:42,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 590 transitions. [2020-07-21 19:52:42,486 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 590 transitions. Word has length 23 [2020-07-21 19:52:42,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:42,486 INFO L479 AbstractCegarLoop]: Abstraction has 360 states and 590 transitions. [2020-07-21 19:52:42,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:42,487 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 590 transitions. [2020-07-21 19:52:42,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 19:52:42,489 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:42,489 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] [2020-07-21 19:52:42,703 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:42,704 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:42,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:42,705 INFO L82 PathProgramCache]: Analyzing trace with hash 798858118, now seen corresponding path program 1 times [2020-07-21 19:52:42,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:42,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2074656301] [2020-07-21 19:52:42,706 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 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 [2020-07-21 19:52:42,744 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:42,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:42,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:42,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:42,771 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 19:52:42,772 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:42,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2074656301] [2020-07-21 19:52:42,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:42,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:42,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465768404] [2020-07-21 19:52:42,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:42,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:42,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:42,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:42,778 INFO L87 Difference]: Start difference. First operand 360 states and 590 transitions. Second operand 3 states. [2020-07-21 19:52:42,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:42,833 INFO L93 Difference]: Finished difference Result 844 states and 1392 transitions. [2020-07-21 19:52:42,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:42,834 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 19:52:42,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:42,842 INFO L225 Difference]: With dead ends: 844 [2020-07-21 19:52:42,843 INFO L226 Difference]: Without dead ends: 498 [2020-07-21 19:52:42,848 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 [2020-07-21 19:52:42,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498 states. [2020-07-21 19:52:42,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 496. [2020-07-21 19:52:42,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 496 states. [2020-07-21 19:52:42,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 806 transitions. [2020-07-21 19:52:42,890 INFO L78 Accepts]: Start accepts. Automaton has 496 states and 806 transitions. Word has length 23 [2020-07-21 19:52:42,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:42,891 INFO L479 AbstractCegarLoop]: Abstraction has 496 states and 806 transitions. [2020-07-21 19:52:42,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:42,892 INFO L276 IsEmpty]: Start isEmpty. Operand 496 states and 806 transitions. [2020-07-21 19:52:42,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 19:52:42,897 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:42,897 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] [2020-07-21 19:52:43,112 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:43,112 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:43,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:43,113 INFO L82 PathProgramCache]: Analyzing trace with hash 6129535, now seen corresponding path program 1 times [2020-07-21 19:52:43,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:43,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32915783] [2020-07-21 19:52:43,113 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 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 [2020-07-21 19:52:43,149 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:52:43,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:43,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:43,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:43,181 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 19:52:43,181 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:43,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32915783] [2020-07-21 19:52:43,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:43,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:43,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943130313] [2020-07-21 19:52:43,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:43,183 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:43,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:43,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:43,184 INFO L87 Difference]: Start difference. First operand 496 states and 806 transitions. Second operand 3 states. [2020-07-21 19:52:43,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:43,219 INFO L93 Difference]: Finished difference Result 900 states and 1488 transitions. [2020-07-21 19:52:43,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:43,220 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 19:52:43,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:43,226 INFO L225 Difference]: With dead ends: 900 [2020-07-21 19:52:43,227 INFO L226 Difference]: Without dead ends: 898 [2020-07-21 19:52:43,228 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 [2020-07-21 19:52:43,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 898 states. [2020-07-21 19:52:43,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 898 to 704. [2020-07-21 19:52:43,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 704 states. [2020-07-21 19:52:43,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 704 states to 704 states and 1118 transitions. [2020-07-21 19:52:43,257 INFO L78 Accepts]: Start accepts. Automaton has 704 states and 1118 transitions. Word has length 24 [2020-07-21 19:52:43,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:43,257 INFO L479 AbstractCegarLoop]: Abstraction has 704 states and 1118 transitions. [2020-07-21 19:52:43,257 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:43,257 INFO L276 IsEmpty]: Start isEmpty. Operand 704 states and 1118 transitions. [2020-07-21 19:52:43,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 19:52:43,260 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:43,260 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] [2020-07-21 19:52:43,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:43,467 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:43,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:43,468 INFO L82 PathProgramCache]: Analyzing trace with hash -580676479, now seen corresponding path program 1 times [2020-07-21 19:52:43,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:43,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2098346102] [2020-07-21 19:52:43,470 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 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 [2020-07-21 19:52:43,508 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:43,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:43,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:43,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:43,520 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 19:52:43,522 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:43,523 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2098346102] [2020-07-21 19:52:43,523 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:43,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:43,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366576615] [2020-07-21 19:52:43,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:43,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:43,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:43,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:43,525 INFO L87 Difference]: Start difference. First operand 704 states and 1118 transitions. Second operand 3 states. [2020-07-21 19:52:43,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:43,563 INFO L93 Difference]: Finished difference Result 1052 states and 1664 transitions. [2020-07-21 19:52:43,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:43,564 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 19:52:43,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:43,570 INFO L225 Difference]: With dead ends: 1052 [2020-07-21 19:52:43,570 INFO L226 Difference]: Without dead ends: 714 [2020-07-21 19:52:43,572 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 [2020-07-21 19:52:43,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 714 states. [2020-07-21 19:52:43,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 714 to 712. [2020-07-21 19:52:43,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 712 states. [2020-07-21 19:52:43,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 712 states to 712 states and 1110 transitions. [2020-07-21 19:52:43,606 INFO L78 Accepts]: Start accepts. Automaton has 712 states and 1110 transitions. Word has length 24 [2020-07-21 19:52:43,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:43,607 INFO L479 AbstractCegarLoop]: Abstraction has 712 states and 1110 transitions. [2020-07-21 19:52:43,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:43,607 INFO L276 IsEmpty]: Start isEmpty. Operand 712 states and 1110 transitions. [2020-07-21 19:52:43,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 19:52:43,610 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:43,610 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] [2020-07-21 19:52:43,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:43,825 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:43,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:43,826 INFO L82 PathProgramCache]: Analyzing trace with hash -1591793729, now seen corresponding path program 1 times [2020-07-21 19:52:43,826 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:43,826 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [729466927] [2020-07-21 19:52:43,827 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 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 [2020-07-21 19:52:43,882 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:43,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:43,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:43,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:43,899 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 19:52:43,899 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:43,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [729466927] [2020-07-21 19:52:43,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:43,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:43,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928894956] [2020-07-21 19:52:43,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:43,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:43,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:43,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:43,903 INFO L87 Difference]: Start difference. First operand 712 states and 1110 transitions. Second operand 3 states. [2020-07-21 19:52:43,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:43,946 INFO L93 Difference]: Finished difference Result 1660 states and 2600 transitions. [2020-07-21 19:52:43,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:43,947 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 19:52:43,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:43,953 INFO L225 Difference]: With dead ends: 1660 [2020-07-21 19:52:43,953 INFO L226 Difference]: Without dead ends: 970 [2020-07-21 19:52:43,956 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 [2020-07-21 19:52:43,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 970 states. [2020-07-21 19:52:43,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 970 to 968. [2020-07-21 19:52:43,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 968 states. [2020-07-21 19:52:43,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 968 states to 968 states and 1494 transitions. [2020-07-21 19:52:43,991 INFO L78 Accepts]: Start accepts. Automaton has 968 states and 1494 transitions. Word has length 24 [2020-07-21 19:52:43,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:43,992 INFO L479 AbstractCegarLoop]: Abstraction has 968 states and 1494 transitions. [2020-07-21 19:52:43,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:43,992 INFO L276 IsEmpty]: Start isEmpty. Operand 968 states and 1494 transitions. [2020-07-21 19:52:43,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 19:52:43,995 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:43,995 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] [2020-07-21 19:52:44,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:44,210 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:44,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:44,211 INFO L82 PathProgramCache]: Analyzing trace with hash -1089633349, now seen corresponding path program 1 times [2020-07-21 19:52:44,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:44,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1274623810] [2020-07-21 19:52:44,211 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 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 [2020-07-21 19:52:44,242 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:52:44,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:44,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:44,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:44,258 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 19:52:44,259 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:44,260 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1274623810] [2020-07-21 19:52:44,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:44,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:44,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080298725] [2020-07-21 19:52:44,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:44,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:44,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:44,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:44,262 INFO L87 Difference]: Start difference. First operand 968 states and 1494 transitions. Second operand 3 states. [2020-07-21 19:52:44,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:44,317 INFO L93 Difference]: Finished difference Result 1724 states and 2712 transitions. [2020-07-21 19:52:44,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:44,318 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 19:52:44,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:44,329 INFO L225 Difference]: With dead ends: 1724 [2020-07-21 19:52:44,329 INFO L226 Difference]: Without dead ends: 1722 [2020-07-21 19:52:44,332 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 [2020-07-21 19:52:44,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1722 states. [2020-07-21 19:52:44,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1722 to 1400. [2020-07-21 19:52:44,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1400 states. [2020-07-21 19:52:44,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1400 states to 1400 states and 2102 transitions. [2020-07-21 19:52:44,396 INFO L78 Accepts]: Start accepts. Automaton has 1400 states and 2102 transitions. Word has length 25 [2020-07-21 19:52:44,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:44,398 INFO L479 AbstractCegarLoop]: Abstraction has 1400 states and 2102 transitions. [2020-07-21 19:52:44,398 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:44,398 INFO L276 IsEmpty]: Start isEmpty. Operand 1400 states and 2102 transitions. [2020-07-21 19:52:44,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 19:52:44,404 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:44,405 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] [2020-07-21 19:52:44,618 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:44,619 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:44,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:44,620 INFO L82 PathProgramCache]: Analyzing trace with hash -1676439363, now seen corresponding path program 1 times [2020-07-21 19:52:44,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:44,621 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1713045555] [2020-07-21 19:52:44,622 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 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 [2020-07-21 19:52:44,678 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:44,679 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:44,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:44,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:44,692 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 19:52:44,692 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:44,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1713045555] [2020-07-21 19:52:44,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:44,693 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:44,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796921569] [2020-07-21 19:52:44,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:44,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:44,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:44,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:44,696 INFO L87 Difference]: Start difference. First operand 1400 states and 2102 transitions. Second operand 3 states. [2020-07-21 19:52:44,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:44,740 INFO L93 Difference]: Finished difference Result 2092 states and 3128 transitions. [2020-07-21 19:52:44,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:44,741 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 19:52:44,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:44,752 INFO L225 Difference]: With dead ends: 2092 [2020-07-21 19:52:44,753 INFO L226 Difference]: Without dead ends: 1418 [2020-07-21 19:52:44,756 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 [2020-07-21 19:52:44,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1418 states. [2020-07-21 19:52:44,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1418 to 1416. [2020-07-21 19:52:44,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1416 states. [2020-07-21 19:52:44,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1416 states to 1416 states and 2086 transitions. [2020-07-21 19:52:44,824 INFO L78 Accepts]: Start accepts. Automaton has 1416 states and 2086 transitions. Word has length 25 [2020-07-21 19:52:44,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:44,825 INFO L479 AbstractCegarLoop]: Abstraction has 1416 states and 2086 transitions. [2020-07-21 19:52:44,825 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:44,826 INFO L276 IsEmpty]: Start isEmpty. Operand 1416 states and 2086 transitions. [2020-07-21 19:52:44,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 19:52:44,831 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:44,831 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] [2020-07-21 19:52:45,044 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:45,045 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:45,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:45,046 INFO L82 PathProgramCache]: Analyzing trace with hash 1607410683, now seen corresponding path program 1 times [2020-07-21 19:52:45,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:45,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [930765479] [2020-07-21 19:52:45,047 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 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 [2020-07-21 19:52:45,126 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:45,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:45,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:45,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:45,138 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 19:52:45,139 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:45,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [930765479] [2020-07-21 19:52:45,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:45,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:45,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205687200] [2020-07-21 19:52:45,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:45,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:45,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:45,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:45,146 INFO L87 Difference]: Start difference. First operand 1416 states and 2086 transitions. Second operand 3 states. [2020-07-21 19:52:45,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:45,211 INFO L93 Difference]: Finished difference Result 3276 states and 4840 transitions. [2020-07-21 19:52:45,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:45,212 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 19:52:45,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:45,226 INFO L225 Difference]: With dead ends: 3276 [2020-07-21 19:52:45,226 INFO L226 Difference]: Without dead ends: 1898 [2020-07-21 19:52:45,232 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 [2020-07-21 19:52:45,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1898 states. [2020-07-21 19:52:45,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1898 to 1896. [2020-07-21 19:52:45,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1896 states. [2020-07-21 19:52:45,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1896 states to 1896 states and 2758 transitions. [2020-07-21 19:52:45,305 INFO L78 Accepts]: Start accepts. Automaton has 1896 states and 2758 transitions. Word has length 25 [2020-07-21 19:52:45,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:45,306 INFO L479 AbstractCegarLoop]: Abstraction has 1896 states and 2758 transitions. [2020-07-21 19:52:45,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:45,306 INFO L276 IsEmpty]: Start isEmpty. Operand 1896 states and 2758 transitions. [2020-07-21 19:52:45,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 19:52:45,310 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:45,310 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] [2020-07-21 19:52:45,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:45,526 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:45,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:45,527 INFO L82 PathProgramCache]: Analyzing trace with hash -698544044, now seen corresponding path program 1 times [2020-07-21 19:52:45,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:45,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1573699617] [2020-07-21 19:52:45,529 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 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 [2020-07-21 19:52:45,582 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:52:45,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:45,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:45,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:45,599 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 19:52:45,600 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:45,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1573699617] [2020-07-21 19:52:45,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:45,601 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:45,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402414351] [2020-07-21 19:52:45,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:45,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:45,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:45,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:45,605 INFO L87 Difference]: Start difference. First operand 1896 states and 2758 transitions. Second operand 3 states. [2020-07-21 19:52:45,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:45,691 INFO L93 Difference]: Finished difference Result 3308 states and 4904 transitions. [2020-07-21 19:52:45,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:45,692 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 19:52:45,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:45,719 INFO L225 Difference]: With dead ends: 3308 [2020-07-21 19:52:45,719 INFO L226 Difference]: Without dead ends: 3306 [2020-07-21 19:52:45,721 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 [2020-07-21 19:52:45,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3306 states. [2020-07-21 19:52:45,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3306 to 2792. [2020-07-21 19:52:45,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2792 states. [2020-07-21 19:52:45,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2792 states to 2792 states and 3942 transitions. [2020-07-21 19:52:45,862 INFO L78 Accepts]: Start accepts. Automaton has 2792 states and 3942 transitions. Word has length 26 [2020-07-21 19:52:45,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:45,863 INFO L479 AbstractCegarLoop]: Abstraction has 2792 states and 3942 transitions. [2020-07-21 19:52:45,863 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:45,863 INFO L276 IsEmpty]: Start isEmpty. Operand 2792 states and 3942 transitions. [2020-07-21 19:52:45,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 19:52:45,870 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:45,871 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] [2020-07-21 19:52:46,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:46,087 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:46,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:46,088 INFO L82 PathProgramCache]: Analyzing trace with hash -1285350058, now seen corresponding path program 1 times [2020-07-21 19:52:46,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:46,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [407667913] [2020-07-21 19:52:46,089 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 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 [2020-07-21 19:52:46,154 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:46,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:46,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:46,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:46,168 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 19:52:46,168 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:46,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [407667913] [2020-07-21 19:52:46,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:46,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:46,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665988490] [2020-07-21 19:52:46,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:46,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:46,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:46,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:46,173 INFO L87 Difference]: Start difference. First operand 2792 states and 3942 transitions. Second operand 3 states. [2020-07-21 19:52:46,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:46,238 INFO L93 Difference]: Finished difference Result 4172 states and 5864 transitions. [2020-07-21 19:52:46,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:46,239 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 19:52:46,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:46,261 INFO L225 Difference]: With dead ends: 4172 [2020-07-21 19:52:46,262 INFO L226 Difference]: Without dead ends: 2826 [2020-07-21 19:52:46,269 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 [2020-07-21 19:52:46,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2826 states. [2020-07-21 19:52:46,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2826 to 2824. [2020-07-21 19:52:46,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2824 states. [2020-07-21 19:52:46,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2824 states to 2824 states and 3910 transitions. [2020-07-21 19:52:46,396 INFO L78 Accepts]: Start accepts. Automaton has 2824 states and 3910 transitions. Word has length 26 [2020-07-21 19:52:46,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:46,397 INFO L479 AbstractCegarLoop]: Abstraction has 2824 states and 3910 transitions. [2020-07-21 19:52:46,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:46,397 INFO L276 IsEmpty]: Start isEmpty. Operand 2824 states and 3910 transitions. [2020-07-21 19:52:46,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 19:52:46,403 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:46,403 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] [2020-07-21 19:52:46,618 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:46,619 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:46,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:46,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1998499988, now seen corresponding path program 1 times [2020-07-21 19:52:46,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:46,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1677470788] [2020-07-21 19:52:46,620 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 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 [2020-07-21 19:52:46,666 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:46,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:46,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:46,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:46,677 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 19:52:46,678 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:46,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1677470788] [2020-07-21 19:52:46,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:46,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:46,681 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130815755] [2020-07-21 19:52:46,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:46,682 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:46,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:46,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:46,683 INFO L87 Difference]: Start difference. First operand 2824 states and 3910 transitions. Second operand 3 states. [2020-07-21 19:52:46,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:46,776 INFO L93 Difference]: Finished difference Result 6476 states and 8968 transitions. [2020-07-21 19:52:46,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:46,777 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 19:52:46,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:46,801 INFO L225 Difference]: With dead ends: 6476 [2020-07-21 19:52:46,802 INFO L226 Difference]: Without dead ends: 3722 [2020-07-21 19:52:46,809 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 [2020-07-21 19:52:46,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3722 states. [2020-07-21 19:52:46,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3722 to 3720. [2020-07-21 19:52:46,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3720 states. [2020-07-21 19:52:46,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3720 states to 3720 states and 5062 transitions. [2020-07-21 19:52:46,956 INFO L78 Accepts]: Start accepts. Automaton has 3720 states and 5062 transitions. Word has length 26 [2020-07-21 19:52:46,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:46,956 INFO L479 AbstractCegarLoop]: Abstraction has 3720 states and 5062 transitions. [2020-07-21 19:52:46,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:46,957 INFO L276 IsEmpty]: Start isEmpty. Operand 3720 states and 5062 transitions. [2020-07-21 19:52:46,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:52:46,964 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:46,964 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] [2020-07-21 19:52:47,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:47,178 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:47,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:47,178 INFO L82 PathProgramCache]: Analyzing trace with hash -1459677136, now seen corresponding path program 1 times [2020-07-21 19:52:47,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:47,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [657218631] [2020-07-21 19:52:47,179 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 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 [2020-07-21 19:52:47,213 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:47,214 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:47,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:47,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:47,223 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 19:52:47,223 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:47,223 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [657218631] [2020-07-21 19:52:47,223 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:47,223 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:47,224 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474154499] [2020-07-21 19:52:47,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:47,224 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:47,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:47,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:47,225 INFO L87 Difference]: Start difference. First operand 3720 states and 5062 transitions. Second operand 3 states. [2020-07-21 19:52:47,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:47,280 INFO L93 Difference]: Finished difference Result 5580 states and 7560 transitions. [2020-07-21 19:52:47,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:47,281 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 19:52:47,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:47,297 INFO L225 Difference]: With dead ends: 5580 [2020-07-21 19:52:47,297 INFO L226 Difference]: Without dead ends: 3786 [2020-07-21 19:52:47,301 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 [2020-07-21 19:52:47,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3786 states. [2020-07-21 19:52:47,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3786 to 3784. [2020-07-21 19:52:47,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3784 states. [2020-07-21 19:52:47,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3784 states to 3784 states and 5062 transitions. [2020-07-21 19:52:47,404 INFO L78 Accepts]: Start accepts. Automaton has 3784 states and 5062 transitions. Word has length 27 [2020-07-21 19:52:47,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:47,404 INFO L479 AbstractCegarLoop]: Abstraction has 3784 states and 5062 transitions. [2020-07-21 19:52:47,404 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:47,405 INFO L276 IsEmpty]: Start isEmpty. Operand 3784 states and 5062 transitions. [2020-07-21 19:52:47,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:52:47,410 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:47,410 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] [2020-07-21 19:52:47,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:47,624 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:47,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:47,624 INFO L82 PathProgramCache]: Analyzing trace with hash 1824172910, now seen corresponding path program 1 times [2020-07-21 19:52:47,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:47,625 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1769834516] [2020-07-21 19:52:47,625 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 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 [2020-07-21 19:52:47,661 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:47,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:47,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:47,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:47,674 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 19:52:47,674 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:47,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1769834516] [2020-07-21 19:52:47,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:47,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:47,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440040748] [2020-07-21 19:52:47,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:47,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:47,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:47,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:47,677 INFO L87 Difference]: Start difference. First operand 3784 states and 5062 transitions. Second operand 3 states. [2020-07-21 19:52:47,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:47,817 INFO L93 Difference]: Finished difference Result 10956 states and 14408 transitions. [2020-07-21 19:52:47,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:47,817 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 19:52:47,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:47,856 INFO L225 Difference]: With dead ends: 10956 [2020-07-21 19:52:47,856 INFO L226 Difference]: Without dead ends: 7306 [2020-07-21 19:52:47,866 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 [2020-07-21 19:52:47,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7306 states. [2020-07-21 19:52:48,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7306 to 7304. [2020-07-21 19:52:48,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7304 states. [2020-07-21 19:52:48,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7304 states to 7304 states and 9350 transitions. [2020-07-21 19:52:48,028 INFO L78 Accepts]: Start accepts. Automaton has 7304 states and 9350 transitions. Word has length 27 [2020-07-21 19:52:48,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:48,028 INFO L479 AbstractCegarLoop]: Abstraction has 7304 states and 9350 transitions. [2020-07-21 19:52:48,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:48,028 INFO L276 IsEmpty]: Start isEmpty. Operand 7304 states and 9350 transitions. [2020-07-21 19:52:48,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:52:48,037 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:48,037 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] [2020-07-21 19:52:48,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:48,253 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:48,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:48,253 INFO L82 PathProgramCache]: Analyzing trace with hash -1883988372, now seen corresponding path program 1 times [2020-07-21 19:52:48,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:48,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [807538752] [2020-07-21 19:52:48,254 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 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) [2020-07-21 19:52:48,285 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:52:48,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:48,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:48,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:48,292 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 19:52:48,293 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:48,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [807538752] [2020-07-21 19:52:48,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:48,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:48,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289289830] [2020-07-21 19:52:48,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:48,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:48,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:48,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:48,295 INFO L87 Difference]: Start difference. First operand 7304 states and 9350 transitions. Second operand 3 states. [2020-07-21 19:52:48,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:48,394 INFO L93 Difference]: Finished difference Result 8076 states and 10632 transitions. [2020-07-21 19:52:48,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:48,395 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 19:52:48,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:48,410 INFO L225 Difference]: With dead ends: 8076 [2020-07-21 19:52:48,410 INFO L226 Difference]: Without dead ends: 8074 [2020-07-21 19:52:48,413 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 [2020-07-21 19:52:48,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8074 states. [2020-07-21 19:52:48,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8074 to 7304. [2020-07-21 19:52:48,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7304 states. [2020-07-21 19:52:48,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7304 states to 7304 states and 9222 transitions. [2020-07-21 19:52:48,621 INFO L78 Accepts]: Start accepts. Automaton has 7304 states and 9222 transitions. Word has length 27 [2020-07-21 19:52:48,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:48,621 INFO L479 AbstractCegarLoop]: Abstraction has 7304 states and 9222 transitions. [2020-07-21 19:52:48,621 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:48,622 INFO L276 IsEmpty]: Start isEmpty. Operand 7304 states and 9222 transitions. [2020-07-21 19:52:48,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 19:52:48,633 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:48,633 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, 1, 1, 1] [2020-07-21 19:52:48,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:48,847 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:48,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:48,847 INFO L82 PathProgramCache]: Analyzing trace with hash 715001129, now seen corresponding path program 1 times [2020-07-21 19:52:48,848 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:48,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1880107001] [2020-07-21 19:52:48,848 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 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 [2020-07-21 19:52:48,880 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:52:48,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:48,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:48,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:48,891 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 19:52:48,892 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:48,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1880107001] [2020-07-21 19:52:48,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:48,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:48,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281655727] [2020-07-21 19:52:48,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:48,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:48,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:48,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:48,896 INFO L87 Difference]: Start difference. First operand 7304 states and 9222 transitions. Second operand 3 states. [2020-07-21 19:52:49,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:49,083 INFO L93 Difference]: Finished difference Result 12172 states and 15496 transitions. [2020-07-21 19:52:49,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:49,083 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 19:52:49,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:49,117 INFO L225 Difference]: With dead ends: 12172 [2020-07-21 19:52:49,117 INFO L226 Difference]: Without dead ends: 12170 [2020-07-21 19:52:49,125 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 [2020-07-21 19:52:49,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12170 states. [2020-07-21 19:52:49,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12170 to 11144. [2020-07-21 19:52:49,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11144 states. [2020-07-21 19:52:49,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11144 states to 11144 states and 13702 transitions. [2020-07-21 19:52:49,529 INFO L78 Accepts]: Start accepts. Automaton has 11144 states and 13702 transitions. Word has length 28 [2020-07-21 19:52:49,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:49,530 INFO L479 AbstractCegarLoop]: Abstraction has 11144 states and 13702 transitions. [2020-07-21 19:52:49,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:49,530 INFO L276 IsEmpty]: Start isEmpty. Operand 11144 states and 13702 transitions. [2020-07-21 19:52:49,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 19:52:49,553 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:49,553 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] [2020-07-21 19:52:49,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:49,768 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:49,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:49,769 INFO L82 PathProgramCache]: Analyzing trace with hash 128195115, now seen corresponding path program 1 times [2020-07-21 19:52:49,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:49,769 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [939461356] [2020-07-21 19:52:49,769 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 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 [2020-07-21 19:52:49,811 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:49,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:49,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:49,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:49,822 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 19:52:49,823 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:49,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [939461356] [2020-07-21 19:52:49,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:49,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:49,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63049463] [2020-07-21 19:52:49,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:49,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:49,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:49,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:49,825 INFO L87 Difference]: Start difference. First operand 11144 states and 13702 transitions. Second operand 3 states. [2020-07-21 19:52:50,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:50,040 INFO L93 Difference]: Finished difference Result 25228 states and 30856 transitions. [2020-07-21 19:52:50,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:50,040 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 19:52:50,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:50,079 INFO L225 Difference]: With dead ends: 25228 [2020-07-21 19:52:50,079 INFO L226 Difference]: Without dead ends: 14218 [2020-07-21 19:52:50,111 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 [2020-07-21 19:52:50,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14218 states. [2020-07-21 19:52:50,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14218 to 14216. [2020-07-21 19:52:50,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14216 states. [2020-07-21 19:52:50,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14216 states to 14216 states and 16902 transitions. [2020-07-21 19:52:50,564 INFO L78 Accepts]: Start accepts. Automaton has 14216 states and 16902 transitions. Word has length 28 [2020-07-21 19:52:50,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:50,564 INFO L479 AbstractCegarLoop]: Abstraction has 14216 states and 16902 transitions. [2020-07-21 19:52:50,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:50,564 INFO L276 IsEmpty]: Start isEmpty. Operand 14216 states and 16902 transitions. [2020-07-21 19:52:50,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 19:52:50,587 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:50,588 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] [2020-07-21 19:52:50,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:50,801 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:50,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:50,802 INFO L82 PathProgramCache]: Analyzing trace with hash 690414627, now seen corresponding path program 1 times [2020-07-21 19:52:50,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:50,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1921341460] [2020-07-21 19:52:50,803 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 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 [2020-07-21 19:52:50,839 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:52:50,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:50,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:50,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:50,847 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 19:52:50,847 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:50,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1921341460] [2020-07-21 19:52:50,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:50,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:50,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606641355] [2020-07-21 19:52:50,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:50,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:50,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:50,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:50,850 INFO L87 Difference]: Start difference. First operand 14216 states and 16902 transitions. Second operand 3 states. [2020-07-21 19:52:51,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:51,076 INFO L93 Difference]: Finished difference Result 23178 states and 27399 transitions. [2020-07-21 19:52:51,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:51,077 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 19:52:51,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:51,134 INFO L225 Difference]: With dead ends: 23178 [2020-07-21 19:52:51,135 INFO L226 Difference]: Without dead ends: 23176 [2020-07-21 19:52:51,148 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 [2020-07-21 19:52:51,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23176 states. [2020-07-21 19:52:52,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23176 to 22152. [2020-07-21 19:52:52,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22152 states. [2020-07-21 19:52:52,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22152 states to 22152 states and 25862 transitions. [2020-07-21 19:52:52,120 INFO L78 Accepts]: Start accepts. Automaton has 22152 states and 25862 transitions. Word has length 29 [2020-07-21 19:52:52,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:52,120 INFO L479 AbstractCegarLoop]: Abstraction has 22152 states and 25862 transitions. [2020-07-21 19:52:52,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:52,120 INFO L276 IsEmpty]: Start isEmpty. Operand 22152 states and 25862 transitions. [2020-07-21 19:52:52,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 19:52:52,159 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:52,160 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] [2020-07-21 19:52:52,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:52,376 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:52,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:52,377 INFO L82 PathProgramCache]: Analyzing trace with hash 103608613, now seen corresponding path program 1 times [2020-07-21 19:52:52,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:52,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [326062877] [2020-07-21 19:52:52,377 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 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 [2020-07-21 19:52:52,415 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:52:52,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:52,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:52,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:52,432 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 19:52:52,432 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:52,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [326062877] [2020-07-21 19:52:52,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:52,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:52,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913465865] [2020-07-21 19:52:52,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:52,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:52,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:52,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:52,434 INFO L87 Difference]: Start difference. First operand 22152 states and 25862 transitions. Second operand 3 states. [2020-07-21 19:52:52,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:52,845 INFO L93 Difference]: Finished difference Result 49800 states and 57606 transitions. [2020-07-21 19:52:52,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:52,845 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 19:52:52,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:52,846 INFO L225 Difference]: With dead ends: 49800 [2020-07-21 19:52:52,846 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 19:52:52,912 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 [2020-07-21 19:52:52,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 19:52:52,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 19:52:52,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 19:52:52,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 19:52:52,914 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 29 [2020-07-21 19:52:52,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:52,914 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 19:52:52,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:52,914 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 19:52:52,915 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 19:52:53,127 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:53,132 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 19:52:53,200 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 19:52:53,200 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:52:53,200 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:52:53,201 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 19:52:53,201 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 19:52:53,201 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 19:52:53,201 INFO L271 CegarLoopResult]: At program point L159(lines 5 163) the Hoare annotation is: true [2020-07-21 19:52:53,201 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 163) no Hoare annotation was computed. [2020-07-21 19:52:53,201 INFO L268 CegarLoopResult]: For program point L118-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,201 INFO L268 CegarLoopResult]: For program point L143-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,201 INFO L268 CegarLoopResult]: For program point L102-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,202 INFO L268 CegarLoopResult]: For program point L94-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,202 INFO L268 CegarLoopResult]: For program point L119(line 119) no Hoare annotation was computed. [2020-07-21 19:52:53,202 INFO L268 CegarLoopResult]: For program point L86-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,202 INFO L268 CegarLoopResult]: For program point L144(line 144) no Hoare annotation was computed. [2020-07-21 19:52:53,202 INFO L268 CegarLoopResult]: For program point L78-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,202 INFO L268 CegarLoopResult]: For program point L70-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,202 INFO L268 CegarLoopResult]: For program point L128-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,203 INFO L271 CegarLoopResult]: At program point L153-1(lines 39 158) the Hoare annotation is: true [2020-07-21 19:52:53,203 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 163) no Hoare annotation was computed. [2020-07-21 19:52:53,203 INFO L268 CegarLoopResult]: For program point L129(line 129) no Hoare annotation was computed. [2020-07-21 19:52:53,203 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 161) no Hoare annotation was computed. [2020-07-21 19:52:53,203 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 163) the Hoare annotation is: true [2020-07-21 19:52:53,203 INFO L268 CegarLoopResult]: For program point L154(line 154) no Hoare annotation was computed. [2020-07-21 19:52:53,204 INFO L264 CegarLoopResult]: At program point L154-1(lines 5 163) the Hoare annotation is: false [2020-07-21 19:52:53,204 INFO L268 CegarLoopResult]: For program point L113-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,204 INFO L268 CegarLoopResult]: For program point L138-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,204 INFO L268 CegarLoopResult]: For program point L114(line 114) no Hoare annotation was computed. [2020-07-21 19:52:53,204 INFO L268 CegarLoopResult]: For program point L139(line 139) no Hoare annotation was computed. [2020-07-21 19:52:53,204 INFO L268 CegarLoopResult]: For program point L98-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,204 INFO L268 CegarLoopResult]: For program point L123-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,204 INFO L268 CegarLoopResult]: For program point L90-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,204 INFO L268 CegarLoopResult]: For program point L148-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,205 INFO L268 CegarLoopResult]: For program point L82-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,205 INFO L268 CegarLoopResult]: For program point L41(lines 41 43) no Hoare annotation was computed. [2020-07-21 19:52:53,205 INFO L268 CegarLoopResult]: For program point L74-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,205 INFO L268 CegarLoopResult]: For program point L66(lines 66 68) no Hoare annotation was computed. [2020-07-21 19:52:53,205 INFO L268 CegarLoopResult]: For program point L66-2(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,205 INFO L268 CegarLoopResult]: For program point L124(line 124) no Hoare annotation was computed. [2020-07-21 19:52:53,205 INFO L268 CegarLoopResult]: For program point L149(line 149) no Hoare annotation was computed. [2020-07-21 19:52:53,205 INFO L268 CegarLoopResult]: For program point L108-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,205 INFO L268 CegarLoopResult]: For program point L133-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 19:52:53,205 INFO L268 CegarLoopResult]: For program point L109(line 109) no Hoare annotation was computed. [2020-07-21 19:52:53,206 INFO L268 CegarLoopResult]: For program point L134(line 134) no Hoare annotation was computed. [2020-07-21 19:52:53,223 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 07:52:53 BoogieIcfgContainer [2020-07-21 19:52:53,223 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 19:52:53,226 INFO L168 Benchmark]: Toolchain (without parser) took 15608.55 ms. Allocated memory was 136.8 MB in the beginning and 603.5 MB in the end (delta: 466.6 MB). Free memory was 99.9 MB in the beginning and 451.7 MB in the end (delta: -351.8 MB). Peak memory consumption was 114.8 MB. Max. memory is 7.1 GB. [2020-07-21 19:52:53,227 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 136.8 MB. Free memory is still 118.3 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 19:52:53,227 INFO L168 Benchmark]: CACSL2BoogieTranslator took 401.02 ms. Allocated memory is still 136.8 MB. Free memory was 99.5 MB in the beginning and 88.8 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB. [2020-07-21 19:52:53,228 INFO L168 Benchmark]: Boogie Preprocessor took 146.38 ms. Allocated memory was 136.8 MB in the beginning and 201.3 MB in the end (delta: 64.5 MB). Free memory was 88.8 MB in the beginning and 178.8 MB in the end (delta: -90.0 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-21 19:52:53,228 INFO L168 Benchmark]: RCFGBuilder took 509.27 ms. Allocated memory is still 201.3 MB. Free memory was 178.8 MB in the beginning and 159.8 MB in the end (delta: 19.0 MB). Peak memory consumption was 19.0 MB. Max. memory is 7.1 GB. [2020-07-21 19:52:53,232 INFO L168 Benchmark]: TraceAbstraction took 14527.80 ms. Allocated memory was 201.3 MB in the beginning and 603.5 MB in the end (delta: 402.1 MB). Free memory was 158.8 MB in the beginning and 451.7 MB in the end (delta: -292.9 MB). Peak memory consumption was 109.2 MB. Max. memory is 7.1 GB. [2020-07-21 19:52:53,234 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 136.8 MB. Free memory is still 118.3 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 401.02 ms. Allocated memory is still 136.8 MB. Free memory was 99.5 MB in the beginning and 88.8 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 146.38 ms. Allocated memory was 136.8 MB in the beginning and 201.3 MB in the end (delta: 64.5 MB). Free memory was 88.8 MB in the beginning and 178.8 MB in the end (delta: -90.0 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 509.27 ms. Allocated memory is still 201.3 MB. Free memory was 178.8 MB in the beginning and 159.8 MB in the end (delta: 19.0 MB). Peak memory consumption was 19.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 14527.80 ms. Allocated memory was 201.3 MB in the beginning and 603.5 MB in the end (delta: 402.1 MB). Free memory was 158.8 MB in the beginning and 451.7 MB in the end (delta: -292.9 MB). Peak memory consumption was 109.2 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: 14.3s, OverallIterations: 27, TraceHistogramMax: 1, AutomataDifference: 2.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 2303 SDtfs, 1111 SDslu, 1571 SDs, 0 SdLazy, 144 SolverSat, 27 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 631 GetRequests, 604 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22152occurred in iteration=26, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 3.2s AutomataMinimizationTime, 27 MinimizatonAttempts, 4122 StatesRemovedByMinimization, 26 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: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 658 NumberOfCodeBlocks, 555 NumberOfCodeBlocksAsserted, 46 NumberOfCheckSat, 631 ConstructedInterpolants, 0 QuantifiedInterpolants, 29641 SizeOfPredicates, 0 NumberOfNonLiveVariables, 2814 ConjunctsInSsa, 81 ConjunctsInUnsatCore, 27 InterpolantComputations, 27 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...