/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:23:37,922 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:23:37,926 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:23:37,958 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:23:37,959 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:23:37,963 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:23:37,966 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:23:37,981 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:23:37,985 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:23:37,991 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:23:37,994 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:23:37,996 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:23:37,996 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:23:37,999 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:23:38,003 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:23:38,004 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:23:38,007 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:23:38,009 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:23:38,012 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:23:38,021 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:23:38,030 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:23:38,038 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:23:38,041 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:23:38,043 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:23:38,047 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:23:38,063 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:23:38,064 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:23:38,066 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:23:38,068 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 13:23:38,115 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:23:38,116 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:23:38,118 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:23:38,119 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:23:38,120 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:23:38,120 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:23:38,120 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:23:38,120 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:23:38,121 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:23:38,121 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:23:38,122 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:23:38,122 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:23:38,123 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:23:38,123 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:23:38,123 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:23:38,124 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:23:38,124 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:23:38,124 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:23:38,124 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:23:38,125 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:23:38,125 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:23:38,125 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:23:38,125 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:23:38,126 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:23:38,126 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:23:38,126 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:23:38,126 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:38,126 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:23:38,127 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:23:38,127 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 13:23:38,528 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:23:38,547 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:23:38,552 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:23:38,560 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:23:38,562 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:23:38,563 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_5-1.c [2020-07-21 13:23:38,696 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e885436ca/93058262ebf040aab57a71c27bb1b8b1/FLAGb8c588fd4 [2020-07-21 13:23:39,389 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:23:39,391 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_5-1.c [2020-07-21 13:23:39,403 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e885436ca/93058262ebf040aab57a71c27bb1b8b1/FLAGb8c588fd4 [2020-07-21 13:23:39,741 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e885436ca/93058262ebf040aab57a71c27bb1b8b1 [2020-07-21 13:23:39,756 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:23:39,760 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:23:39,761 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:23:39,762 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:23:39,768 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:23:39,770 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:23:39" (1/1) ... [2020-07-21 13:23:39,775 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d4dbc2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:39, skipping insertion in model container [2020-07-21 13:23:39,776 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:23:39" (1/1) ... [2020-07-21 13:23:39,789 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:23:39,815 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:23:40,165 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:23:40,176 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:23:40,201 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:23:40,230 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:23:40,231 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:40 WrapperNode [2020-07-21 13:23:40,232 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:23:40,234 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:23:40,235 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:23:40,235 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:23:40,262 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:40" (1/1) ... [2020-07-21 13:23:40,263 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:40" (1/1) ... [2020-07-21 13:23:40,275 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:40" (1/1) ... [2020-07-21 13:23:40,276 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:40" (1/1) ... [2020-07-21 13:23:40,283 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:40" (1/1) ... [2020-07-21 13:23:40,289 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:40" (1/1) ... [2020-07-21 13:23:40,292 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:40" (1/1) ... [2020-07-21 13:23:40,296 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:23:40,297 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:23:40,298 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:23:40,298 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:23:40,300 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:40" (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 13:23:40,554 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:23:40,554 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:23:40,554 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 13:23:40,554 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:23:40,555 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 13:23:40,555 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:23:40,555 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 13:23:40,555 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:23:40,556 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:23:40,557 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:23:40,823 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:23:40,823 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 13:23:40,829 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:23:40 BoogieIcfgContainer [2020-07-21 13:23:40,830 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:23:40,832 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:23:40,832 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:23:40,837 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:23:40,838 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:23:39" (1/3) ... [2020-07-21 13:23:40,840 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f37b9a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:23:40, skipping insertion in model container [2020-07-21 13:23:40,840 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:23:40" (2/3) ... [2020-07-21 13:23:40,841 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f37b9a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:23:40, skipping insertion in model container [2020-07-21 13:23:40,841 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:23:40" (3/3) ... [2020-07-21 13:23:40,844 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_5-1.c [2020-07-21 13:23:40,864 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:23:40,878 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:23:40,904 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:23:40,947 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:23:40,947 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:23:40,947 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:23:40,948 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:23:40,948 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:23:40,948 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:23:40,948 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:23:40,949 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:23:40,981 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 13:23:40,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 13:23:40,994 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:40,996 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:40,997 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:41,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:41,010 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 13:23:41,024 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:41,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2138441551] [2020-07-21 13:23:41,026 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 13:23:41,118 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:41,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:41,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:23:41,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:41,312 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 13:23:41,313 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:23:41,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2138441551] [2020-07-21 13:23:41,317 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:23:41,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:23:41,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767723481] [2020-07-21 13:23:41,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:23:41,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:41,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:23:41,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:23:41,366 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 13:23:41,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:41,554 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 13:23:41,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:23:41,557 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 13:23:41,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:41,573 INFO L225 Difference]: With dead ends: 35 [2020-07-21 13:23:41,574 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 13:23:41,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 13:23:41,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 13:23:41,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 13:23:41,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 13:23:41,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 13:23:41,657 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 13:23:41,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:41,658 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 13:23:41,658 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:23:41,659 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 13:23:41,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 13:23:41,662 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:41,663 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:41,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:41,880 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:41,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:41,882 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 13:23:41,883 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:41,883 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1520548900] [2020-07-21 13:23:41,884 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 13:23:41,919 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:41,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:41,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:23:41,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:41,988 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 13:23:41,989 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:23:41,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1520548900] [2020-07-21 13:23:41,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:23:41,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:23:41,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550535035] [2020-07-21 13:23:42,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:23:42,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:42,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:23:42,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:23:42,005 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 13:23:42,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:42,141 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 13:23:42,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:23:42,143 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 13:23:42,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:42,145 INFO L225 Difference]: With dead ends: 27 [2020-07-21 13:23:42,145 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 13:23:42,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 13:23:42,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 13:23:42,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 13:23:42,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 13:23:42,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 13:23:42,160 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 13:23:42,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:42,160 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 13:23:42,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:23:42,161 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 13:23:42,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 13:23:42,163 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:42,164 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:42,378 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:42,379 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:42,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:42,382 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 13:23:42,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:42,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [422757414] [2020-07-21 13:23:42,384 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 13:23:42,432 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:42,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:42,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:23:42,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:42,555 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 13:23:42,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:23:42,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:42,953 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 13:23:42,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [422757414] [2020-07-21 13:23:42,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:23:42,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 13:23:42,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971555499] [2020-07-21 13:23:42,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 13:23:42,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:42,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 13:23:42,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 13:23:42,959 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 13:23:43,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:43,214 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 13:23:43,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 13:23:43,216 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 13:23:43,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:43,221 INFO L225 Difference]: With dead ends: 32 [2020-07-21 13:23:43,222 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 13:23:43,225 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:23:43,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 13:23:43,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 13:23:43,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 13:23:43,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 13:23:43,259 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 13:23:43,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:43,260 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 13:23:43,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 13:23:43,260 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 13:23:43,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:23:43,265 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:43,266 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:43,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:43,474 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:43,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:43,475 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 13:23:43,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:43,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1300912102] [2020-07-21 13:23:43,477 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 13:23:43,535 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:43,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:43,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:23:43,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:43,594 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 13:23:43,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:23:43,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:43,872 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 13:23:43,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1300912102] [2020-07-21 13:23:43,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:23:43,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 13:23:43,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216440320] [2020-07-21 13:23:43,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 13:23:43,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:43,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 13:23:43,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 13:23:43,877 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 13:23:44,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:44,047 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 13:23:44,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 13:23:44,048 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 13:23:44,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:44,051 INFO L225 Difference]: With dead ends: 37 [2020-07-21 13:23:44,052 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 13:23:44,053 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:23:44,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 13:23:44,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 13:23:44,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 13:23:44,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 13:23:44,068 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 13:23:44,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:44,069 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 13:23:44,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 13:23:44,069 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 13:23:44,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 13:23:44,074 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:44,074 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:44,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:44,290 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:44,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:44,291 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 13:23:44,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:44,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [278396400] [2020-07-21 13:23:44,295 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 13:23:44,360 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:44,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:44,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:23:44,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:44,457 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 13:23:44,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:23:44,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:44,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:44,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:44,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:44,997 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 13:23:44,998 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [278396400] [2020-07-21 13:23:44,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:23:44,999 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 13:23:45,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805180178] [2020-07-21 13:23:45,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 13:23:45,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:45,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 13:23:45,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:23:45,003 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 13:23:45,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:45,276 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 13:23:45,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:23:45,277 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 13:23:45,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:45,279 INFO L225 Difference]: With dead ends: 42 [2020-07-21 13:23:45,280 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 13:23:45,281 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:23:45,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 13:23:45,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 13:23:45,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 13:23:45,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 13:23:45,296 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 13:23:45,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:45,297 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 13:23:45,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 13:23:45,297 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 13:23:45,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 13:23:45,300 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:45,300 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:45,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:45,504 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:45,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:45,506 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 13:23:45,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:45,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227133819] [2020-07-21 13:23:45,508 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 13:23:45,567 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:45,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:45,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:23:45,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:45,635 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 13:23:45,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:23:45,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:46,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:46,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:46,060 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 13:23:46,061 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227133819] [2020-07-21 13:23:46,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:23:46,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 13:23:46,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535815171] [2020-07-21 13:23:46,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 13:23:46,064 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:46,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 13:23:46,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:23:46,065 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 13:23:46,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:46,272 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 13:23:46,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:23:46,273 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 13:23:46,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:46,281 INFO L225 Difference]: With dead ends: 47 [2020-07-21 13:23:46,282 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 13:23:46,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:23:46,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 13:23:46,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 13:23:46,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 13:23:46,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 13:23:46,323 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 13:23:46,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:46,324 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 13:23:46,324 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 13:23:46,324 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 13:23:46,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 13:23:46,338 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:46,338 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:46,539 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:46,540 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:46,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:46,541 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 13:23:46,542 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:46,542 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [73616148] [2020-07-21 13:23:46,543 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 13:23:46,596 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:46,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:46,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:23:46,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:46,681 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 13:23:46,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:23:47,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:47,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:47,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:47,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:47,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:47,602 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 13:23:47,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [73616148] [2020-07-21 13:23:47,604 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:23:47,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 13:23:47,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068256833] [2020-07-21 13:23:47,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:23:47,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:47,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:23:47,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:23:47,607 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 13:23:47,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:47,875 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 13:23:47,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:23:47,876 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 13:23:47,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:47,880 INFO L225 Difference]: With dead ends: 52 [2020-07-21 13:23:47,880 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 13:23:47,882 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:23:47,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 13:23:47,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 13:23:47,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 13:23:47,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 13:23:47,909 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 13:23:47,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:47,910 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 13:23:47,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:23:47,911 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 13:23:47,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 13:23:47,914 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:47,914 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:48,127 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:48,128 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:48,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:48,129 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 13:23:48,129 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:48,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [709196404] [2020-07-21 13:23:48,130 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 13:23:48,196 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:48,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:48,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:23:48,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:48,294 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 13:23:48,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:23:48,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:48,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:49,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:49,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:49,155 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 13:23:49,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [709196404] [2020-07-21 13:23:49,157 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:23:49,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 12 [2020-07-21 13:23:49,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976819610] [2020-07-21 13:23:49,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 13:23:49,159 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:49,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 13:23:49,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:23:49,160 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 12 states. [2020-07-21 13:23:49,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:49,341 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 13:23:49,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:23:49,345 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 96 [2020-07-21 13:23:49,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:49,348 INFO L225 Difference]: With dead ends: 57 [2020-07-21 13:23:49,348 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 13:23:49,350 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 9 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2020-07-21 13:23:49,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 13:23:49,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 13:23:49,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 13:23:49,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 13:23:49,367 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 13:23:49,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:49,368 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 13:23:49,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 13:23:49,368 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 13:23:49,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 13:23:49,371 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:49,371 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:49,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:49,585 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:49,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:49,586 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 13:23:49,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:49,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [699881638] [2020-07-21 13:23:49,588 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 13:23:49,669 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:49,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:49,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:23:49,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:49,845 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 13:23:49,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:23:50,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:50,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:50,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:50,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:50,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:51,020 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 13:23:51,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [699881638] [2020-07-21 13:23:51,021 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:23:51,021 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 13:23:51,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045772847] [2020-07-21 13:23:51,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:23:51,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:51,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:23:51,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:23:51,024 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 14 states. [2020-07-21 13:23:51,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:51,328 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 13:23:51,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:23:51,328 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 117 [2020-07-21 13:23:51,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:51,332 INFO L225 Difference]: With dead ends: 62 [2020-07-21 13:23:51,333 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 13:23:51,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:23:51,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 13:23:51,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 13:23:51,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 13:23:51,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 13:23:51,350 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 13:23:51,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:51,351 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 13:23:51,351 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:23:51,352 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 13:23:51,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 13:23:51,355 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:51,356 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:51,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:51,572 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:51,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:51,573 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 13:23:51,573 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:51,574 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [139333165] [2020-07-21 13:23:51,575 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 13:23:51,679 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:51,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:51,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:23:51,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:51,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 221 proven. 407 refuted. 0 times theorem prover too weak. 1298 trivial. 0 not checked. [2020-07-21 13:23:51,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:23:52,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:52,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:52,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:52,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:52,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:52,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:52,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:53,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:53,104 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 223 proven. 427 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2020-07-21 13:23:53,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [139333165] [2020-07-21 13:23:53,106 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:23:53,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 13:23:53,106 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108337205] [2020-07-21 13:23:53,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:23:53,109 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:53,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:23:53,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:23:53,110 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 14 states. [2020-07-21 13:23:53,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:53,375 INFO L93 Difference]: Finished difference Result 88 states and 260 transitions. [2020-07-21 13:23:53,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:23:53,376 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 190 [2020-07-21 13:23:53,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:53,379 INFO L225 Difference]: With dead ends: 88 [2020-07-21 13:23:53,379 INFO L226 Difference]: Without dead ends: 49 [2020-07-21 13:23:53,383 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:23:53,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-21 13:23:53,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-07-21 13:23:53,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-21 13:23:53,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 70 transitions. [2020-07-21 13:23:53,396 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 70 transitions. Word has length 190 [2020-07-21 13:23:53,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:53,397 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 70 transitions. [2020-07-21 13:23:53,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:23:53,397 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 70 transitions. [2020-07-21 13:23:53,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-21 13:23:53,401 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:53,401 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 15, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:53,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:53,617 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:53,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:53,618 INFO L82 PathProgramCache]: Analyzing trace with hash -1040445716, now seen corresponding path program 5 times [2020-07-21 13:23:53,618 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:53,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [737645434] [2020-07-21 13:23:53,619 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 13:23:53,736 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:53,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:53,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:23:53,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:53,816 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 104 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2020-07-21 13:23:53,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:23:54,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:54,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:54,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:54,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:54,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:54,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:55,001 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 130 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2020-07-21 13:23:55,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [737645434] [2020-07-21 13:23:55,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:23:55,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 13:23:55,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413597374] [2020-07-21 13:23:55,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:23:55,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:55,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:23:55,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:23:55,005 INFO L87 Difference]: Start difference. First operand 49 states and 70 transitions. Second operand 14 states. [2020-07-21 13:23:55,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:55,241 INFO L93 Difference]: Finished difference Result 67 states and 91 transitions. [2020-07-21 13:23:55,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:23:55,243 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 136 [2020-07-21 13:23:55,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:55,246 INFO L225 Difference]: With dead ends: 67 [2020-07-21 13:23:55,247 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 13:23:55,249 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 248 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:23:55,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 13:23:55,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2020-07-21 13:23:55,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 13:23:55,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 77 transitions. [2020-07-21 13:23:55,263 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 77 transitions. Word has length 136 [2020-07-21 13:23:55,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:55,264 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 77 transitions. [2020-07-21 13:23:55,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:23:55,264 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 77 transitions. [2020-07-21 13:23:55,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 13:23:55,267 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:55,267 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:55,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:55,483 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:55,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:55,483 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 6 times [2020-07-21 13:23:55,484 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:55,485 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1700577296] [2020-07-21 13:23:55,485 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 13:23:55,594 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:55,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:55,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-21 13:23:55,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:55,794 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2020-07-21 13:23:55,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:23:56,862 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2020-07-21 13:23:56,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1700577296] [2020-07-21 13:23:56,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:23:56,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 20 [2020-07-21 13:23:56,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122700790] [2020-07-21 13:23:56,865 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 13:23:56,865 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:56,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 13:23:56,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=335, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:23:56,866 INFO L87 Difference]: Start difference. First operand 54 states and 77 transitions. Second operand 20 states. [2020-07-21 13:23:57,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:57,271 INFO L93 Difference]: Finished difference Result 112 states and 191 transitions. [2020-07-21 13:23:57,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 13:23:57,272 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 109 [2020-07-21 13:23:57,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:57,278 INFO L225 Difference]: With dead ends: 112 [2020-07-21 13:23:57,278 INFO L226 Difference]: Without dead ends: 105 [2020-07-21 13:23:57,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 195 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=409, Unknown=0, NotChecked=0, Total=462 [2020-07-21 13:23:57,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-07-21 13:23:57,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 81. [2020-07-21 13:23:57,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 13:23:57,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 145 transitions. [2020-07-21 13:23:57,376 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 145 transitions. Word has length 109 [2020-07-21 13:23:57,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:57,377 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 145 transitions. [2020-07-21 13:23:57,377 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 13:23:57,377 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 145 transitions. [2020-07-21 13:23:57,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 13:23:57,391 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:57,391 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:57,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:57,592 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:57,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:57,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1349477645, now seen corresponding path program 7 times [2020-07-21 13:23:57,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:57,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1856322420] [2020-07-21 13:23:57,594 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 13:23:57,705 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:57,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:57,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 13:23:57,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:57,811 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 233 proven. 55 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-21 13:23:57,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:23:58,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:58,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:58,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:58,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:23:58,771 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 230 proven. 70 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 13:23:58,772 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1856322420] [2020-07-21 13:23:58,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:23:58,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-21 13:23:58,773 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254878022] [2020-07-21 13:23:58,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:23:58,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:23:58,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:23:58,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:23:58,776 INFO L87 Difference]: Start difference. First operand 81 states and 145 transitions. Second operand 14 states. [2020-07-21 13:23:59,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:23:59,028 INFO L93 Difference]: Finished difference Result 97 states and 160 transitions. [2020-07-21 13:23:59,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:23:59,029 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-21 13:23:59,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:23:59,034 INFO L225 Difference]: With dead ends: 97 [2020-07-21 13:23:59,035 INFO L226 Difference]: Without dead ends: 90 [2020-07-21 13:23:59,039 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:23:59,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-21 13:23:59,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 71. [2020-07-21 13:23:59,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 13:23:59,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 123 transitions. [2020-07-21 13:23:59,068 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 123 transitions. Word has length 121 [2020-07-21 13:23:59,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:23:59,073 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 123 transitions. [2020-07-21 13:23:59,073 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:23:59,074 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 123 transitions. [2020-07-21 13:23:59,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 13:23:59,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:23:59,079 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:23:59,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:23:59,294 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:23:59,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:23:59,295 INFO L82 PathProgramCache]: Analyzing trace with hash -280177283, now seen corresponding path program 8 times [2020-07-21 13:23:59,296 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:23:59,296 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [129311861] [2020-07-21 13:23:59,297 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 13:23:59,407 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:23:59,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:23:59,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 13:23:59,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:23:59,528 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 147 proven. 141 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-21 13:23:59,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:00,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:00,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:00,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:00,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:00,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:00,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:00,532 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 146 proven. 154 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 13:24:00,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [129311861] [2020-07-21 13:24:00,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:00,533 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-21 13:24:00,533 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801311726] [2020-07-21 13:24:00,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:24:00,535 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:00,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:24:00,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:24:00,535 INFO L87 Difference]: Start difference. First operand 71 states and 123 transitions. Second operand 14 states. [2020-07-21 13:24:00,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:00,770 INFO L93 Difference]: Finished difference Result 107 states and 179 transitions. [2020-07-21 13:24:00,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:24:00,771 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-21 13:24:00,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:00,774 INFO L225 Difference]: With dead ends: 107 [2020-07-21 13:24:00,775 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 13:24:00,779 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:24:00,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 13:24:00,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2020-07-21 13:24:00,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 13:24:00,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 95 transitions. [2020-07-21 13:24:00,804 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 95 transitions. Word has length 121 [2020-07-21 13:24:00,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:00,809 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 95 transitions. [2020-07-21 13:24:00,809 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:24:00,809 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 95 transitions. [2020-07-21 13:24:00,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-07-21 13:24:00,812 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:00,812 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 13, 7, 7, 7, 7, 7, 7, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:01,026 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:01,027 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:01,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:01,028 INFO L82 PathProgramCache]: Analyzing trace with hash -1402909364, now seen corresponding path program 9 times [2020-07-21 13:24:01,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:01,029 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [819442757] [2020-07-21 13:24:01,029 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 13:24:01,191 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:01,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:01,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:24:01,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:01,298 INFO L134 CoverageAnalysis]: Checked inductivity of 582 backedges. 78 proven. 198 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2020-07-21 13:24:01,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:02,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:02,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:02,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:02,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:02,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:02,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:02,654 INFO L134 CoverageAnalysis]: Checked inductivity of 582 backedges. 84 proven. 218 refuted. 0 times theorem prover too weak. 280 trivial. 0 not checked. [2020-07-21 13:24:02,655 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [819442757] [2020-07-21 13:24:02,656 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:02,656 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 13:24:02,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705013797] [2020-07-21 13:24:02,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:24:02,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:02,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:24:02,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:24:02,661 INFO L87 Difference]: Start difference. First operand 61 states and 95 transitions. Second operand 14 states. [2020-07-21 13:24:02,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:02,993 INFO L93 Difference]: Finished difference Result 109 states and 171 transitions. [2020-07-21 13:24:02,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:24:02,994 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 110 [2020-07-21 13:24:02,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:02,997 INFO L225 Difference]: With dead ends: 109 [2020-07-21 13:24:02,997 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 13:24:03,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 196 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:24:03,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 13:24:03,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-07-21 13:24:03,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-21 13:24:03,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2020-07-21 13:24:03,024 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 110 [2020-07-21 13:24:03,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:03,024 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2020-07-21 13:24:03,024 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:24:03,025 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2020-07-21 13:24:03,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 13:24:03,028 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:03,029 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:03,243 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:03,244 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:03,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:03,245 INFO L82 PathProgramCache]: Analyzing trace with hash 1072341053, now seen corresponding path program 10 times [2020-07-21 13:24:03,245 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:03,246 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [329667522] [2020-07-21 13:24:03,246 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 13:24:03,356 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:03,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:03,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 13:24:03,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:03,469 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 113 proven. 175 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-21 13:24:03,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:04,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:04,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:04,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:04,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:04,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:04,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:04,583 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 114 proven. 186 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 13:24:04,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [329667522] [2020-07-21 13:24:04,596 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:04,596 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-21 13:24:04,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277739104] [2020-07-21 13:24:04,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:24:04,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:04,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:24:04,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:24:04,603 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand 14 states. [2020-07-21 13:24:04,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:04,804 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2020-07-21 13:24:04,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:24:04,805 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-21 13:24:04,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:04,806 INFO L225 Difference]: With dead ends: 75 [2020-07-21 13:24:04,807 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 13:24:04,809 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:24:04,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 13:24:04,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-07-21 13:24:04,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 13:24:04,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 61 transitions. [2020-07-21 13:24:04,817 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 61 transitions. Word has length 121 [2020-07-21 13:24:04,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:04,818 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 61 transitions. [2020-07-21 13:24:04,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:24:04,818 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 61 transitions. [2020-07-21 13:24:04,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 13:24:04,822 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:04,822 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:05,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:05,037 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:05,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:05,039 INFO L82 PathProgramCache]: Analyzing trace with hash -419017667, now seen corresponding path program 11 times [2020-07-21 13:24:05,039 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:05,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407456874] [2020-07-21 13:24:05,040 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 13:24:05,180 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:05,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:05,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 13:24:05,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:05,290 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 116 proven. 217 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2020-07-21 13:24:05,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:06,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:06,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:06,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:06,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:06,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:06,674 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:06,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:06,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:06,844 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 112 proven. 243 refuted. 0 times theorem prover too weak. 367 trivial. 0 not checked. [2020-07-21 13:24:06,845 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407456874] [2020-07-21 13:24:06,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:06,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 16 [2020-07-21 13:24:06,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357155808] [2020-07-21 13:24:06,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 13:24:06,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:06,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 13:24:06,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-21 13:24:06,849 INFO L87 Difference]: Start difference. First operand 53 states and 61 transitions. Second operand 16 states. [2020-07-21 13:24:07,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:07,085 INFO L93 Difference]: Finished difference Result 77 states and 90 transitions. [2020-07-21 13:24:07,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:24:07,087 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 121 [2020-07-21 13:24:07,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:07,088 INFO L225 Difference]: With dead ends: 77 [2020-07-21 13:24:07,088 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 13:24:07,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 216 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:24:07,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 13:24:07,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 13:24:07,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 13:24:07,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 13:24:07,093 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 121 [2020-07-21 13:24:07,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:07,093 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 13:24:07,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 13:24:07,093 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 13:24:07,093 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 13:24:07,303 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:07,308 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 13:24:07,823 WARN L193 SmtUtils]: Spent 453.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 34 [2020-07-21 13:24:08,241 WARN L193 SmtUtils]: Spent 415.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 67 [2020-07-21 13:24:08,434 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 42 [2020-07-21 13:24:08,615 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 52 [2020-07-21 13:24:08,787 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 56 [2020-07-21 13:24:09,021 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 110 DAG size of output: 41 [2020-07-21 13:24:09,433 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 52 [2020-07-21 13:24:09,603 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 52 [2020-07-21 13:24:09,777 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 56 [2020-07-21 13:24:09,897 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 34 [2020-07-21 13:24:10,013 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 52 [2020-07-21 13:24:10,138 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 110 DAG size of output: 41 [2020-07-21 13:24:10,258 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 34 [2020-07-21 13:24:10,391 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 52 [2020-07-21 13:24:10,513 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 34 [2020-07-21 13:24:10,731 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 52 [2020-07-21 13:24:11,184 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 52 [2020-07-21 13:24:11,302 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 56 [2020-07-21 13:24:12,375 WARN L193 SmtUtils]: Spent 1000.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 31 [2020-07-21 13:24:12,404 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 13:24:12,405 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:24:12,405 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:24:12,405 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 13:24:12,405 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 13:24:12,405 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 13:24:12,406 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 27) no Hoare annotation was computed. [2020-07-21 13:24:12,406 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 23 30) the Hoare annotation is: true [2020-07-21 13:24:12,406 INFO L268 CegarLoopResult]: For program point L27(line 27) no Hoare annotation was computed. [2020-07-21 13:24:12,406 INFO L268 CegarLoopResult]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-07-21 13:24:12,406 INFO L264 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: (and (<= main_~x~0 5) (<= 5 main_~x~0)) [2020-07-21 13:24:12,407 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 23 30) no Hoare annotation was computed. [2020-07-21 13:24:12,407 INFO L268 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-07-21 13:24:12,407 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 28) no Hoare annotation was computed. [2020-07-21 13:24:12,407 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 23 30) no Hoare annotation was computed. [2020-07-21 13:24:12,407 INFO L268 CegarLoopResult]: For program point fiboEXIT(lines 5 13) no Hoare annotation was computed. [2020-07-21 13:24:12,407 INFO L268 CegarLoopResult]: For program point fiboFINAL(lines 5 13) no Hoare annotation was computed. [2020-07-21 13:24:12,407 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= fibo_~n |fibo_#in~n|) (<= |fibo_#in~n| fibo_~n) (<= 2 |fibo_#in~n|)) [2020-07-21 13:24:12,408 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-21 13:24:12,408 INFO L264 CegarLoopResult]: At program point L11-2(line 11) the Hoare annotation is: (let ((.cse0 (and (= |fibo_#t~ret0| 2) (<= |fibo_#in~n| 4))) (.cse1 (<= |fibo_#in~n| 3))) (and (or .cse0 (and (<= 3 |fibo_#in~n|) .cse1) (<= 5 |fibo_#in~n|) (and (<= |fibo_#in~n| 2) (<= 2 |fibo_#in~n|))) (or .cse0 (<= 6 |fibo_#in~n|) (= |fibo_#t~ret0| 3) .cse1) (let ((.cse2 (<= fibo_~n |fibo_#in~n|)) (.cse3 (<= |fibo_#in~n| fibo_~n))) (or (and (<= 4 |fibo_#in~n|) .cse2 .cse3) (and (= |fibo_#t~ret0| 1) .cse2 .cse3))))) [2020-07-21 13:24:12,408 INFO L268 CegarLoopResult]: For program point L8(lines 8 12) no Hoare annotation was computed. [2020-07-21 13:24:12,408 INFO L268 CegarLoopResult]: For program point L11-3(line 11) no Hoare annotation was computed. [2020-07-21 13:24:12,408 INFO L268 CegarLoopResult]: For program point L6(lines 6 12) no Hoare annotation was computed. [2020-07-21 13:24:12,408 INFO L271 CegarLoopResult]: At program point fiboENTRY(lines 5 13) the Hoare annotation is: true [2020-07-21 13:24:12,418 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:24:12 BoogieIcfgContainer [2020-07-21 13:24:12,419 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 13:24:12,422 INFO L168 Benchmark]: Toolchain (without parser) took 32664.47 ms. Allocated memory was 144.2 MB in the beginning and 459.3 MB in the end (delta: 315.1 MB). Free memory was 101.0 MB in the beginning and 362.5 MB in the end (delta: -261.5 MB). Peak memory consumption was 303.0 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:12,423 INFO L168 Benchmark]: CDTParser took 1.18 ms. Allocated memory is still 144.2 MB. Free memory was 119.1 MB in the beginning and 118.9 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-21 13:24:12,424 INFO L168 Benchmark]: CACSL2BoogieTranslator took 471.76 ms. Allocated memory is still 144.2 MB. Free memory was 100.5 MB in the beginning and 91.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:12,425 INFO L168 Benchmark]: Boogie Preprocessor took 62.47 ms. Allocated memory is still 144.2 MB. Free memory was 91.3 MB in the beginning and 89.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:12,425 INFO L168 Benchmark]: RCFGBuilder took 533.03 ms. Allocated memory was 144.2 MB in the beginning and 202.9 MB in the end (delta: 58.7 MB). Free memory was 89.9 MB in the beginning and 170.7 MB in the end (delta: -80.8 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:12,426 INFO L168 Benchmark]: TraceAbstraction took 31587.52 ms. Allocated memory was 202.9 MB in the beginning and 459.3 MB in the end (delta: 256.4 MB). Free memory was 170.7 MB in the beginning and 362.5 MB in the end (delta: -191.8 MB). Peak memory consumption was 314.1 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:12,429 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.18 ms. Allocated memory is still 144.2 MB. Free memory was 119.1 MB in the beginning and 118.9 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 471.76 ms. Allocated memory is still 144.2 MB. Free memory was 100.5 MB in the beginning and 91.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 62.47 ms. Allocated memory is still 144.2 MB. Free memory was 91.3 MB in the beginning and 89.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 533.03 ms. Allocated memory was 144.2 MB in the beginning and 202.9 MB in the end (delta: 58.7 MB). Free memory was 89.9 MB in the beginning and 170.7 MB in the end (delta: -80.8 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 31587.52 ms. Allocated memory was 202.9 MB in the beginning and 459.3 MB in the end (delta: 256.4 MB). Free memory was 170.7 MB in the beginning and 362.5 MB in the end (delta: -191.8 MB). Peak memory consumption was 314.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 27]: 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 - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 26.3s, OverallIterations: 17, TraceHistogramMax: 27, AutomataDifference: 4.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 5.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 377 SDtfs, 425 SDslu, 1645 SDs, 0 SdLazy, 1627 SolverSat, 428 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2958 GetRequests, 2601 SyntacticMatches, 123 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 704 ImplicationChecksByTransitivity, 3.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=81occurred in iteration=12, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 17 MinimizatonAttempts, 135 StatesRemovedByMinimization, 12 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 95 PreInvPairs, 1452 NumberOfFragments, 86 HoareAnnotationTreeSize, 95 FomulaSimplifications, 595296 FormulaSimplificationTreeSizeReduction, 4.0s HoareSimplificationTime, 8 FomulaSimplificationsInter, 5107 FormulaSimplificationTreeSizeReductionInter, 1.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 16.0s InterpolantComputationTime, 1467 NumberOfCodeBlocks, 1467 NumberOfCodeBlocksAsserted, 34 NumberOfCheckSat, 2875 ConstructedInterpolants, 0 QuantifiedInterpolants, 609941 SizeOfPredicates, 73 NumberOfNonLiveVariables, 3278 ConjunctsInSsa, 213 ConjunctsInUnsatCore, 32 InterpolantComputations, 2 PerfectInterpolantSequences, 12357/16608 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...