/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_7-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:43:40,214 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:43:40,217 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:43:40,231 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:43:40,231 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:43:40,233 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:43:40,234 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:43:40,237 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:43:40,239 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:43:40,240 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:43:40,241 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:43:40,243 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:43:40,243 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:43:40,245 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:43:40,246 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:43:40,248 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:43:40,250 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:43:40,251 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:43:40,254 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:43:40,257 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:43:40,259 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:43:40,261 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:43:40,263 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:43:40,265 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:43:40,269 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:43:40,281 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:43:40,283 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:43:40,284 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:43:40,285 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 19:43:40,307 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:43:40,307 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:43:40,309 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:43:40,310 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:43:40,310 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:43:40,310 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:43:40,310 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:43:40,311 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:43:40,311 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:43:40,311 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:43:40,311 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:43:40,311 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:43:40,312 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:43:40,312 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:43:40,312 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:43:40,312 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:43:40,312 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:43:40,313 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:43:40,313 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:43:40,313 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:43:40,313 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:43:40,313 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:43:40,314 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:43:40,314 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:43:40,314 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:43:40,314 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:43:40,315 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:40,315 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:43:40,315 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:43:40,315 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 19:43:40,780 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:43:40,813 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:43:40,820 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:43:40,824 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:43:40,824 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:43:40,826 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_7-2.c [2020-07-21 19:43:40,942 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8f0968a14/2ec0e54e642141b988f21c46bac04fd4/FLAG507aae4ea [2020-07-21 19:43:41,607 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:43:41,608 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_7-2.c [2020-07-21 19:43:41,618 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8f0968a14/2ec0e54e642141b988f21c46bac04fd4/FLAG507aae4ea [2020-07-21 19:43:41,931 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8f0968a14/2ec0e54e642141b988f21c46bac04fd4 [2020-07-21 19:43:41,944 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:43:41,948 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:43:41,952 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:43:41,953 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:43:41,962 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:43:41,964 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:43:41" (1/1) ... [2020-07-21 19:43:41,969 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b1ca9f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:41, skipping insertion in model container [2020-07-21 19:43:41,969 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:43:41" (1/1) ... [2020-07-21 19:43:41,982 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:43:42,012 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:43:42,260 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:43:42,268 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:43:42,291 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:43:42,314 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:43:42,315 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:42 WrapperNode [2020-07-21 19:43:42,315 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:43:42,317 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:43:42,318 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:43:42,318 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:43:42,342 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:42" (1/1) ... [2020-07-21 19:43:42,343 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:42" (1/1) ... [2020-07-21 19:43:42,351 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:42" (1/1) ... [2020-07-21 19:43:42,352 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:42" (1/1) ... [2020-07-21 19:43:42,358 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:42" (1/1) ... [2020-07-21 19:43:42,362 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:42" (1/1) ... [2020-07-21 19:43:42,364 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:42" (1/1) ... [2020-07-21 19:43:42,366 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:43:42,367 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:43:42,367 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:43:42,367 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:43:42,370 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:42" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:43:42,563 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:43:42,563 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:43:42,563 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 19:43:42,563 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:43:42,564 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:43:42,564 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:43:42,564 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 19:43:42,564 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:43:42,564 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:43:42,565 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:43:42,841 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:43:42,842 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 19:43:42,849 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:43:42 BoogieIcfgContainer [2020-07-21 19:43:42,850 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:43:42,852 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:43:42,852 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:43:42,857 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:43:42,858 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:43:41" (1/3) ... [2020-07-21 19:43:42,859 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f401cd9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:43:42, skipping insertion in model container [2020-07-21 19:43:42,860 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:42" (2/3) ... [2020-07-21 19:43:42,861 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f401cd9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:43:42, skipping insertion in model container [2020-07-21 19:43:42,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:43:42" (3/3) ... [2020-07-21 19:43:42,865 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_7-2.c [2020-07-21 19:43:42,884 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:43:42,896 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:43:42,938 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:43:43,000 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:43:43,000 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:43:43,001 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:43:43,001 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:43:43,001 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:43:43,001 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:43:43,001 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:43:43,002 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:43:43,043 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 19:43:43,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 19:43:43,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:43,085 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:43,086 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:43,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:43,107 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 19:43:43,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:43,123 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1654805641] [2020-07-21 19:43:43,137 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:43,251 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:43:43,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:43,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:43:43,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:43,385 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:43:43,386 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:43:43,387 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1654805641] [2020-07-21 19:43:43,389 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:43:43,389 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:43:43,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212988548] [2020-07-21 19:43:43,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:43:43,399 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:43,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:43:43,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:43:43,418 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 19:43:43,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:43,572 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 19:43:43,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:43:43,581 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 19:43:43,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:43,598 INFO L225 Difference]: With dead ends: 35 [2020-07-21 19:43:43,598 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 19:43:43,605 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 19:43:43,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 19:43:43,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 19:43:43,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 19:43:43,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 19:43:43,680 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 19:43:43,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:43,682 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 19:43:43,682 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:43:43,682 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 19:43:43,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 19:43:43,686 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:43,686 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:43,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:43,898 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:43,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:43,900 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 19:43:43,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:43,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [404619674] [2020-07-21 19:43:43,901 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:43,930 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:43:43,930 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:43,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:43:43,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:43,991 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:43:43,992 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:43:43,992 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [404619674] [2020-07-21 19:43:43,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:43:43,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:43:43,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800758157] [2020-07-21 19:43:44,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:43:44,002 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:44,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:43:44,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:43:44,004 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 19:43:44,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:44,120 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 19:43:44,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:43:44,121 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 19:43:44,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:44,123 INFO L225 Difference]: With dead ends: 27 [2020-07-21 19:43:44,124 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 19:43:44,126 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 19:43:44,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 19:43:44,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 19:43:44,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 19:43:44,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 19:43:44,138 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 19:43:44,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:44,139 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 19:43:44,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:43:44,139 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 19:43:44,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 19:43:44,141 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:44,142 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 19:43:44,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:44,358 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:44,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:44,360 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 19:43:44,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:44,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [123695277] [2020-07-21 19:43:44,361 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:44,411 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:43:44,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:44,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:43:44,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:44,482 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 19:43:44,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:44,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:44,815 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 19:43:44,815 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [123695277] [2020-07-21 19:43:44,816 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:44,816 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 19:43:44,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433157733] [2020-07-21 19:43:44,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:43:44,819 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:44,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:43:44,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:43:44,820 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 19:43:45,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:45,030 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 19:43:45,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:43:45,032 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 19:43:45,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:45,037 INFO L225 Difference]: With dead ends: 32 [2020-07-21 19:43:45,038 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 19:43:45,041 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 19:43:45,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 19:43:45,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 19:43:45,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 19:43:45,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 19:43:45,074 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 19:43:45,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:45,075 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 19:43:45,075 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:43:45,075 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 19:43:45,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:43:45,080 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:45,081 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 19:43:45,296 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:45,297 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:45,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:45,297 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 19:43:45,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:45,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1537836079] [2020-07-21 19:43:45,298 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:45,334 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:43:45,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:45,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:43:45,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:45,397 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 19:43:45,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:45,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:45,623 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 19:43:45,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1537836079] [2020-07-21 19:43:45,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:45,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 19:43:45,625 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611722288] [2020-07-21 19:43:45,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:43:45,626 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:45,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:43:45,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:43:45,627 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 19:43:45,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:45,763 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 19:43:45,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:43:45,764 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 19:43:45,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:45,767 INFO L225 Difference]: With dead ends: 37 [2020-07-21 19:43:45,767 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 19:43:45,768 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 19:43:45,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 19:43:45,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 19:43:45,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 19:43:45,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 19:43:45,782 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 19:43:45,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:45,782 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 19:43:45,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:43:45,783 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 19:43:45,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 19:43:45,785 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:45,785 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 19:43:45,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:45,999 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:46,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:46,000 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 19:43:46,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:46,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [71992858] [2020-07-21 19:43:46,002 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:46,058 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:46,059 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:46,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:43:46,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:46,120 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 19:43:46,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:46,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:46,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:46,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:46,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:46,560 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 19:43:46,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [71992858] [2020-07-21 19:43:46,561 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:46,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 19:43:46,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312287563] [2020-07-21 19:43:46,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:43:46,563 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:46,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:43:46,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:43:46,565 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 19:43:46,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:46,840 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 19:43:46,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:43:46,842 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 19:43:46,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:46,845 INFO L225 Difference]: With dead ends: 42 [2020-07-21 19:43:46,845 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 19:43:46,849 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 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 19:43:46,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 19:43:46,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 19:43:46,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:43:46,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 19:43:46,880 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 19:43:46,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:46,881 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 19:43:46,881 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:43:46,881 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 19:43:46,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 19:43:46,884 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:46,884 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 19:43:47,085 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:47,086 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:47,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:47,087 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 19:43:47,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:47,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [294779494] [2020-07-21 19:43:47,089 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:47,133 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:47,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:47,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:43:47,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:47,203 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 19:43:47,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:47,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:47,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:47,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:47,642 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 19:43:47,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [294779494] [2020-07-21 19:43:47,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:47,644 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 19:43:47,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903035918] [2020-07-21 19:43:47,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:43:47,645 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:47,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:43:47,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:43:47,646 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 19:43:47,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:47,842 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 19:43:47,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:43:47,843 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 19:43:47,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:47,849 INFO L225 Difference]: With dead ends: 47 [2020-07-21 19:43:47,854 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 19:43:47,855 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 19:43:47,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 19:43:47,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 19:43:47,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:43:47,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 19:43:47,888 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 19:43:47,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:47,890 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 19:43:47,890 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:43:47,890 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 19:43:47,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 19:43:47,900 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:47,900 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 19:43:48,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:48,119 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:48,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:48,120 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 19:43:48,121 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:48,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1198208232] [2020-07-21 19:43:48,122 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:48,174 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:48,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:48,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:43:48,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:48,252 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 19:43:48,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:48,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:48,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:48,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:49,007 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:49,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:49,062 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 19:43:49,063 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1198208232] [2020-07-21 19:43:49,063 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:49,063 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 19:43:49,064 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080912831] [2020-07-21 19:43:49,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:43:49,070 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:49,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:43:49,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:43:49,072 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 19:43:49,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:49,342 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 19:43:49,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:43:49,343 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 19:43:49,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:49,347 INFO L225 Difference]: With dead ends: 52 [2020-07-21 19:43:49,347 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 19:43:49,348 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 19:43:49,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 19:43:49,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 19:43:49,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 19:43:49,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 19:43:49,364 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 19:43:49,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:49,365 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 19:43:49,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:43:49,366 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 19:43:49,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 19:43:49,369 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:49,369 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 19:43:49,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:49,586 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:49,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:49,587 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 19:43:49,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:49,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2103088506] [2020-07-21 19:43:49,589 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:49,655 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:49,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:49,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:43:49,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:49,759 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 19:43:49,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:50,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:50,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:50,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:50,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:50,460 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 19:43:50,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2103088506] [2020-07-21 19:43:50,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:50,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 19:43:50,461 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215497277] [2020-07-21 19:43:50,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:43:50,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:50,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:43:50,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:43:50,465 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 19:43:50,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:50,603 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 19:43:50,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:43:50,605 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 19:43:50,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:50,607 INFO L225 Difference]: With dead ends: 57 [2020-07-21 19:43:50,607 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 19:43:50,608 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 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 19:43:50,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 19:43:50,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 19:43:50,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 19:43:50,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 19:43:50,620 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 19:43:50,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:50,621 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 19:43:50,621 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:43:50,621 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 19:43:50,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 19:43:50,624 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:50,624 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 19:43:50,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:50,838 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:50,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:50,840 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 19:43:50,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:50,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [882704989] [2020-07-21 19:43:50,841 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:50,906 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:50,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:50,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:43:50,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:51,010 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 19:43:51,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:51,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:51,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:51,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:51,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:51,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:52,033 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 19:43:52,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [882704989] [2020-07-21 19:43:52,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:52,034 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 19:43:52,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501513414] [2020-07-21 19:43:52,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:43:52,035 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:52,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:43:52,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:43:52,036 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 19:43:52,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:52,382 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 19:43:52,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:43:52,382 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 19:43:52,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:52,385 INFO L225 Difference]: With dead ends: 62 [2020-07-21 19:43:52,385 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 19:43:52,386 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:43:52,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 19:43:52,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 19:43:52,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 19:43:52,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 19:43:52,399 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 19:43:52,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:52,400 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 19:43:52,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:43:52,400 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 19:43:52,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 19:43:52,402 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:52,403 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 19:43:52,615 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:52,615 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:52,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:52,616 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 19:43:52,616 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:52,617 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [203276539] [2020-07-21 19:43:52,618 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:52,711 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:52,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:52,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:43:52,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:52,805 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 19:43:52,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:53,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:53,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:53,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:53,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:53,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:53,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:53,958 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 19:43:53,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [203276539] [2020-07-21 19:43:53,959 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:53,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 19:43:53,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906537302] [2020-07-21 19:43:53,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:43:53,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:53,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:43:53,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:43:53,961 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 19:43:54,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:54,130 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 19:43:54,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:43:54,131 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 19:43:54,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:54,134 INFO L225 Difference]: With dead ends: 67 [2020-07-21 19:43:54,134 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 19:43:54,136 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:43:54,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 19:43:54,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 19:43:54,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 19:43:54,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 19:43:54,148 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 19:43:54,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:54,148 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 19:43:54,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:43:54,149 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 19:43:54,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 19:43:54,153 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:54,153 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:54,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:54,368 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:54,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:54,369 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 19:43:54,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:54,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [973207915] [2020-07-21 19:43:54,370 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:54,497 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:54,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:54,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:43:54,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:54,620 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 19:43:54,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:55,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:56,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:56,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:56,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:56,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:56,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:56,587 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 19:43:56,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [973207915] [2020-07-21 19:43:56,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:56,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 19:43:56,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637215447] [2020-07-21 19:43:56,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:43:56,590 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:56,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:43:56,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:43:56,590 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 19:43:56,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:56,808 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 19:43:56,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:43:56,808 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 19:43:56,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:56,812 INFO L225 Difference]: With dead ends: 72 [2020-07-21 19:43:56,812 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 19:43:56,814 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:43:56,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 19:43:56,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 19:43:56,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 19:43:56,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 19:43:56,847 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 19:43:56,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:56,849 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 19:43:56,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:43:56,849 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 19:43:56,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 19:43:56,857 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:56,857 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:57,072 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:57,072 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:57,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:57,073 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-21 19:43:57,073 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:57,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1505211977] [2020-07-21 19:43:57,074 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:57,210 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:57,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:57,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 666 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:43:57,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:57,369 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-21 19:43:57,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:58,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:58,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:59,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:59,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:59,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:59,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:59,335 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-21 19:43:59,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1505211977] [2020-07-21 19:43:59,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:59,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 16 [2020-07-21 19:43:59,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588180005] [2020-07-21 19:43:59,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 19:43:59,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:59,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 19:43:59,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:43:59,338 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 16 states. [2020-07-21 19:43:59,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:59,549 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 19:43:59,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:43:59,549 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 299 [2020-07-21 19:43:59,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:59,557 INFO L225 Difference]: With dead ends: 77 [2020-07-21 19:43:59,557 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 19:43:59,558 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2020-07-21 19:43:59,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 19:43:59,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 19:43:59,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 19:43:59,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 19:43:59,583 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-21 19:43:59,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:59,584 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 19:43:59,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 19:43:59,585 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 19:43:59,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 19:43:59,598 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:59,598 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:59,812 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:59,813 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:59,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:59,813 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-21 19:43:59,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:59,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328353542] [2020-07-21 19:43:59,814 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:00,034 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:00,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:00,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 1133 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:44:00,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:00,324 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-21 19:44:00,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:02,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:02,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:03,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:03,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:03,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:03,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:03,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:03,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:03,821 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-21 19:44:03,822 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328353542] [2020-07-21 19:44:03,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:03,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 19:44:03,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478101003] [2020-07-21 19:44:03,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:44:03,823 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:03,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:44:03,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:44:03,824 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 18 states. [2020-07-21 19:44:04,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:04,301 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 19:44:04,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:04,301 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 507 [2020-07-21 19:44:04,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:04,306 INFO L225 Difference]: With dead ends: 82 [2020-07-21 19:44:04,306 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 19:44:04,308 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:44:04,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 19:44:04,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 19:44:04,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 19:44:04,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 19:44:04,320 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-21 19:44:04,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:04,321 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 19:44:04,322 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:44:04,322 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 19:44:04,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 19:44:04,325 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:04,325 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:04,539 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:04,540 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:04,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:04,541 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 19:44:04,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:04,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2118697317] [2020-07-21 19:44:04,542 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:04,744 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:04,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:04,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 1001 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:44:04,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:04,952 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 648 proven. 1709 refuted. 0 times theorem prover too weak. 9325 trivial. 0 not checked. [2020-07-21 19:44:04,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:06,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:06,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:07,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:07,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:07,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:07,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:07,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:07,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:07,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:08,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:08,191 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 652 proven. 1756 refuted. 0 times theorem prover too weak. 9274 trivial. 0 not checked. [2020-07-21 19:44:08,191 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2118697317] [2020-07-21 19:44:08,191 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:08,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 19:44:08,192 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823094592] [2020-07-21 19:44:08,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:44:08,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:08,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:44:08,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:44:08,194 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 18 states. [2020-07-21 19:44:08,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:08,519 INFO L93 Difference]: Finished difference Result 147 states and 749 transitions. [2020-07-21 19:44:08,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:08,519 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 450 [2020-07-21 19:44:08,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:08,523 INFO L225 Difference]: With dead ends: 147 [2020-07-21 19:44:08,523 INFO L226 Difference]: Without dead ends: 70 [2020-07-21 19:44:08,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:44:08,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-21 19:44:08,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-07-21 19:44:08,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 19:44:08,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 122 transitions. [2020-07-21 19:44:08,566 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 122 transitions. Word has length 450 [2020-07-21 19:44:08,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:08,568 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 122 transitions. [2020-07-21 19:44:08,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:44:08,568 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 122 transitions. [2020-07-21 19:44:08,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-21 19:44:08,572 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:08,572 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 38, 23, 23, 23, 23, 23, 23, 23, 15, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:08,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:08,787 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:08,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:08,788 INFO L82 PathProgramCache]: Analyzing trace with hash -530192014, now seen corresponding path program 7 times [2020-07-21 19:44:08,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:08,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423255372] [2020-07-21 19:44:08,789 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:09,076 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:09,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:09,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:44:09,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:09,305 INFO L134 CoverageAnalysis]: Checked inductivity of 6039 backedges. 1091 proven. 461 refuted. 0 times theorem prover too weak. 4487 trivial. 0 not checked. [2020-07-21 19:44:09,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:10,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:11,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:11,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:11,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:11,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:11,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:11,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:11,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:11,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:11,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:11,986 INFO L134 CoverageAnalysis]: Checked inductivity of 6039 backedges. 1091 proven. 518 refuted. 0 times theorem prover too weak. 4430 trivial. 0 not checked. [2020-07-21 19:44:11,986 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423255372] [2020-07-21 19:44:11,986 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:11,986 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 19:44:11,987 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601502380] [2020-07-21 19:44:11,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:44:11,988 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:11,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:44:11,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:44:11,989 INFO L87 Difference]: Start difference. First operand 70 states and 122 transitions. Second operand 18 states. [2020-07-21 19:44:12,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:12,271 INFO L93 Difference]: Finished difference Result 120 states and 219 transitions. [2020-07-21 19:44:12,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:12,272 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 327 [2020-07-21 19:44:12,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:12,278 INFO L225 Difference]: With dead ends: 120 [2020-07-21 19:44:12,278 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 19:44:12,281 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 660 GetRequests, 622 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:44:12,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 19:44:12,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 90. [2020-07-21 19:44:12,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-21 19:44:12,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 167 transitions. [2020-07-21 19:44:12,297 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 167 transitions. Word has length 327 [2020-07-21 19:44:12,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:12,297 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 167 transitions. [2020-07-21 19:44:12,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:44:12,298 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 167 transitions. [2020-07-21 19:44:12,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-07-21 19:44:12,303 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:12,303 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 34, 20, 20, 20, 20, 20, 20, 20, 14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:12,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:12,518 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:12,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:12,519 INFO L82 PathProgramCache]: Analyzing trace with hash -301446619, now seen corresponding path program 8 times [2020-07-21 19:44:12,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:12,520 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1871827769] [2020-07-21 19:44:12,520 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:12,721 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:12,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:12,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:44:12,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:12,847 INFO L134 CoverageAnalysis]: Checked inductivity of 4601 backedges. 494 proven. 479 refuted. 0 times theorem prover too weak. 3628 trivial. 0 not checked. [2020-07-21 19:44:12,847 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:13,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:13,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:13,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:13,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:13,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,289 INFO L134 CoverageAnalysis]: Checked inductivity of 4601 backedges. 500 proven. 505 refuted. 0 times theorem prover too weak. 3596 trivial. 0 not checked. [2020-07-21 19:44:14,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1871827769] [2020-07-21 19:44:14,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:14,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 19:44:14,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844753876] [2020-07-21 19:44:14,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 19:44:14,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:14,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 19:44:14,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:44:14,292 INFO L87 Difference]: Start difference. First operand 90 states and 167 transitions. Second operand 14 states. [2020-07-21 19:44:14,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:14,468 INFO L93 Difference]: Finished difference Result 135 states and 267 transitions. [2020-07-21 19:44:14,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:44:14,469 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 287 [2020-07-21 19:44:14,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:14,472 INFO L225 Difference]: With dead ends: 135 [2020-07-21 19:44:14,472 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 19:44:14,475 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 550 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:44:14,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 19:44:14,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 93. [2020-07-21 19:44:14,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 19:44:14,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 181 transitions. [2020-07-21 19:44:14,489 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 181 transitions. Word has length 287 [2020-07-21 19:44:14,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:14,489 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 181 transitions. [2020-07-21 19:44:14,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 19:44:14,490 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 181 transitions. [2020-07-21 19:44:14,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 19:44:14,494 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:14,494 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:14,707 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:14,708 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:14,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:14,709 INFO L82 PathProgramCache]: Analyzing trace with hash 1320340794, now seen corresponding path program 9 times [2020-07-21 19:44:14,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:14,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1716197938] [2020-07-21 19:44:14,710 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:14,915 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:14,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:14,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 666 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:44:14,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:15,045 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 369 proven. 1023 refuted. 0 times theorem prover too weak. 3621 trivial. 0 not checked. [2020-07-21 19:44:15,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:16,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:16,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:16,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:16,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:17,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:17,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:17,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:17,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:17,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:17,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:17,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:17,504 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:17,604 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 375 proven. 1074 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2020-07-21 19:44:17,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1716197938] [2020-07-21 19:44:17,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:17,605 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 18 [2020-07-21 19:44:17,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701300432] [2020-07-21 19:44:17,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:44:17,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:17,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:44:17,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=217, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:44:17,607 INFO L87 Difference]: Start difference. First operand 93 states and 181 transitions. Second operand 18 states. [2020-07-21 19:44:17,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:17,991 INFO L93 Difference]: Finished difference Result 183 states and 362 transitions. [2020-07-21 19:44:17,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:17,992 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 299 [2020-07-21 19:44:17,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:17,994 INFO L225 Difference]: With dead ends: 183 [2020-07-21 19:44:17,994 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 19:44:18,001 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 604 GetRequests, 566 SyntacticMatches, 15 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=392, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:44:18,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 19:44:18,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 87. [2020-07-21 19:44:18,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-07-21 19:44:18,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 126 transitions. [2020-07-21 19:44:18,017 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 126 transitions. Word has length 299 [2020-07-21 19:44:18,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:18,019 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 126 transitions. [2020-07-21 19:44:18,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:44:18,019 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 126 transitions. [2020-07-21 19:44:18,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 19:44:18,024 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:18,024 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 33, 20, 20, 20, 20, 20, 20, 20, 13, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:18,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:18,238 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:18,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:18,238 INFO L82 PathProgramCache]: Analyzing trace with hash -1425621089, now seen corresponding path program 10 times [2020-07-21 19:44:18,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:18,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [861381085] [2020-07-21 19:44:18,239 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:18,451 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:18,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 19:44:18,451 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 19:44:18,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 19:44:18,508 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 19:44:18,560 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 19:44:18,560 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 19:44:18,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:18,839 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 07:44:18 BoogieIcfgContainer [2020-07-21 19:44:18,839 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 19:44:18,846 INFO L168 Benchmark]: Toolchain (without parser) took 36895.66 ms. Allocated memory was 136.3 MB in the beginning and 681.6 MB in the end (delta: 545.3 MB). Free memory was 101.2 MB in the beginning and 526.4 MB in the end (delta: -425.2 MB). Peak memory consumption was 120.1 MB. Max. memory is 7.1 GB. [2020-07-21 19:44:18,846 INFO L168 Benchmark]: CDTParser took 1.04 ms. Allocated memory is still 136.3 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 19:44:18,847 INFO L168 Benchmark]: CACSL2BoogieTranslator took 363.98 ms. Allocated memory is still 136.3 MB. Free memory was 100.8 MB in the beginning and 91.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 19:44:18,849 INFO L168 Benchmark]: Boogie Preprocessor took 49.19 ms. Allocated memory is still 136.3 MB. Free memory was 91.6 MB in the beginning and 90.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 19:44:18,850 INFO L168 Benchmark]: RCFGBuilder took 483.08 ms. Allocated memory was 136.3 MB in the beginning and 200.3 MB in the end (delta: 64.0 MB). Free memory was 90.2 MB in the beginning and 167.9 MB in the end (delta: -77.7 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-07-21 19:44:18,851 INFO L168 Benchmark]: TraceAbstraction took 35987.88 ms. Allocated memory was 200.3 MB in the beginning and 681.6 MB in the end (delta: 481.3 MB). Free memory was 167.2 MB in the beginning and 526.4 MB in the end (delta: -359.2 MB). Peak memory consumption was 122.1 MB. Max. memory is 7.1 GB. [2020-07-21 19:44:18,857 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.04 ms. Allocated memory is still 136.3 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 363.98 ms. Allocated memory is still 136.3 MB. Free memory was 100.8 MB in the beginning and 91.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 49.19 ms. Allocated memory is still 136.3 MB. Free memory was 91.6 MB in the beginning and 90.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 483.08 ms. Allocated memory was 136.3 MB in the beginning and 200.3 MB in the end (delta: 64.0 MB). Free memory was 90.2 MB in the beginning and 167.9 MB in the end (delta: -77.7 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 35987.88 ms. Allocated memory was 200.3 MB in the beginning and 681.6 MB in the end (delta: 481.3 MB). Free memory was 167.2 MB in the beginning and 526.4 MB in the end (delta: -359.2 MB). Peak memory consumption was 122.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 27]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L24] int x = 7; VAL [x=7] [L25] CALL, EXPR fibo(x) VAL [\old(n)=7] [L6] COND FALSE !(n < 1) VAL [\old(n)=7, n=7] [L8] COND FALSE !(n == 1) VAL [\old(n)=7, n=7] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=6] [L6] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L8] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=5] [L6] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L8] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=4] [L6] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L8] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=5, fibo(n-1)=3, n=5] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=5, fibo(n-1)=3, fibo(n-2)=2, n=5] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=6, fibo(n-1)=5, n=6] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=4] [L6] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L8] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=6, fibo(n-1)=5, fibo(n-2)=3, n=6] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=7, fibo(n-1)=8, n=7] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=5] [L6] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L8] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=4] [L6] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L8] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=4, fibo(n-1)=2, n=4] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=4, fibo(n-1)=2, fibo(n-2)=1, n=4] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=5, fibo(n-1)=3, n=5] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=3] [L6] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L8] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=2] [L6] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L8] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L11] CALL, EXPR fibo(n-1) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-1) VAL [\old(n)=2, fibo(n-1)=1, n=2] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=0] [L6] COND TRUE n < 1 [L7] return 0; VAL [\old(n)=0, \result=0, n=0] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=2, fibo(n-1)=1, fibo(n-2)=0, n=2] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) VAL [\old(n)=3, fibo(n-1)=1, n=3] [L11] CALL, EXPR fibo(n-2) VAL [\old(n)=1] [L6] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L8] COND TRUE n == 1 [L9] return 1; VAL [\old(n)=1, \result=1, n=1] [L11] RET, EXPR fibo(n-2) VAL [\old(n)=3, fibo(n-1)=1, fibo(n-2)=1, n=3] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=5, fibo(n-1)=3, fibo(n-2)=2, n=5] [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) VAL [\old(n)=7, fibo(n-1)=8, fibo(n-2)=5, n=7] [L11] return fibo(n-1) + fibo(n-2); [L25] RET, EXPR fibo(x) VAL [fibo(x)=13, x=7] [L25] int result = fibo(x); [L26] COND TRUE result == 13 VAL [result=13, x=7] [L27] __VERIFIER_error() VAL [result=13, x=7] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 35.7s, OverallIterations: 18, TraceHistogramMax: 77, AutomataDifference: 4.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 334 SDtfs, 671 SDslu, 1316 SDs, 0 SdLazy, 1642 SolverSat, 1076 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 6208 GetRequests, 5790 SyntacticMatches, 152 SemanticMatches, 266 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1019 ImplicationChecksByTransitivity, 3.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=93occurred in iteration=16, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 17 MinimizatonAttempts, 228 StatesRemovedByMinimization, 15 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 1.0s SatisfiabilityAnalysisTime, 24.5s InterpolantComputationTime, 3369 NumberOfCodeBlocks, 3330 NumberOfCodeBlocksAsserted, 32 NumberOfCheckSat, 6107 ConstructedInterpolants, 0 QuantifiedInterpolants, 2719849 SizeOfPredicates, 92 NumberOfNonLiveVariables, 6824 ConjunctsInSsa, 184 ConjunctsInUnsatCore, 32 InterpolantComputations, 2 PerfectInterpolantSequences, 92979/111120 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 incorrect! Received shutdown request...