/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 NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_i10_o10-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:02:20,123 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:02:20,127 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:02:20,144 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:02:20,144 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:02:20,146 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:02:20,148 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:02:20,150 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:02:20,153 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:02:20,154 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:02:20,155 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:02:20,157 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:02:20,157 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:02:20,159 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:02:20,160 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:02:20,162 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:02:20,164 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:02:20,165 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:02:20,167 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:02:20,170 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:02:20,172 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:02:20,174 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:02:20,176 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:02:20,180 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:02:20,187 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 11:02:20,213 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:02:20,214 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:02:20,215 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:02:20,216 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 11:02:20,252 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:02:20,253 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:02:20,257 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:02:20,257 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:02:20,257 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:02:20,258 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:02:20,258 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:02:20,258 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:02:20,258 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:02:20,258 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:02:20,260 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:02:20,261 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:02:20,261 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:02:20,262 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:02:20,262 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:02:20,262 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:02:20,262 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:02:20,263 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:02:20,263 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:02:20,263 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:02:20,264 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:02:20,264 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:02:20,265 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:02:20,265 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:02:20,265 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:02:20,265 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:02:20,265 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:02:20,266 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:02:20,266 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:02:20,266 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 -> NOT_INCREMENTALLY [2020-07-21 11:02:20,631 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:02:20,665 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:02:20,671 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:02:20,673 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:02:20,674 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:02:20,675 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i10_o10-2.c [2020-07-21 11:02:20,804 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7785bd1a6/c3116c793794472698f02d0340fb5a00/FLAGdebe15bbc [2020-07-21 11:02:21,486 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:02:21,487 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_i10_o10-2.c [2020-07-21 11:02:21,496 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7785bd1a6/c3116c793794472698f02d0340fb5a00/FLAGdebe15bbc [2020-07-21 11:02:21,827 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7785bd1a6/c3116c793794472698f02d0340fb5a00 [2020-07-21 11:02:21,839 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:02:21,842 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:02:21,843 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:02:21,844 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:02:21,847 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:02:21,848 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:02:21" (1/1) ... [2020-07-21 11:02:21,852 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e02ab94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:02:21, skipping insertion in model container [2020-07-21 11:02:21,852 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:02:21" (1/1) ... [2020-07-21 11:02:21,860 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:02:21,876 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:02:22,047 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:02:22,052 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:02:22,069 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:02:22,085 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:02:22,086 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:02:22 WrapperNode [2020-07-21 11:02:22,087 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:02:22,088 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:02:22,088 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:02:22,088 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:02:22,104 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:02:22" (1/1) ... [2020-07-21 11:02:22,104 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:02:22" (1/1) ... [2020-07-21 11:02:22,110 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:02:22" (1/1) ... [2020-07-21 11:02:22,111 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:02:22" (1/1) ... [2020-07-21 11:02:22,115 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:02:22" (1/1) ... [2020-07-21 11:02:22,117 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:02:22" (1/1) ... [2020-07-21 11:02:22,118 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:02:22" (1/1) ... [2020-07-21 11:02:22,119 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:02:22,120 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:02:22,120 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:02:22,120 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:02:22,121 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:02:22" (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 11:02:22,301 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:02:22,301 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:02:22,301 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 11:02:22,301 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:02:22,301 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 11:02:22,301 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:02:22,302 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 11:02:22,302 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:02:22,302 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:02:22,302 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:02:22,490 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:02:22,491 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 11:02:22,495 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:02:22 BoogieIcfgContainer [2020-07-21 11:02:22,495 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:02:22,497 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:02:22,497 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:02:22,501 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:02:22,501 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:02:21" (1/3) ... [2020-07-21 11:02:22,502 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@127f8cfb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:02:22, skipping insertion in model container [2020-07-21 11:02:22,503 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:02:22" (2/3) ... [2020-07-21 11:02:22,503 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@127f8cfb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:02:22, skipping insertion in model container [2020-07-21 11:02:22,503 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:02:22" (3/3) ... [2020-07-21 11:02:22,505 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i10_o10-2.c [2020-07-21 11:02:22,515 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:02:22,523 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:02:22,536 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:02:22,559 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:02:22,560 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:02:22,560 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:02:22,560 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:02:22,560 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:02:22,560 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:02:22,561 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:02:22,561 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:02:22,582 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 11:02:22,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 11:02:22,590 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:02:22,592 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:02:22,592 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:02:22,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:02:22,599 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-21 11:02:22,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:02:22,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [911935458] [2020-07-21 11:02:22,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:02:22,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:02:22,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 11:02:22,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:02:22,848 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 11:02:22,849 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:02:22,850 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [911935458] [2020-07-21 11:02:22,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:02:22,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 11:02:22,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487687843] [2020-07-21 11:02:22,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 11:02:22,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:02:22,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 11:02:22,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 11:02:22,878 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 11:02:22,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:02:22,992 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-21 11:02:22,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 11:02:22,995 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 11:02:22,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:02:23,009 INFO L225 Difference]: With dead ends: 30 [2020-07-21 11:02:23,010 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 11:02:23,015 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 11:02:23,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 11:02:23,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 11:02:23,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 11:02:23,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 11:02:23,085 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 11:02:23,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:02:23,089 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 11:02:23,089 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 11:02:23,089 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 11:02:23,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 11:02:23,098 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:02:23,099 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:02:23,300 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:02:23,301 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:02:23,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:02:23,303 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-21 11:02:23,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:02:23,304 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1425714349] [2020-07-21 11:02:23,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:02:23,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:02:23,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 11:02:23,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:02:23,421 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 11:02:23,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:02:23,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:23,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:23,700 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:02:23,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1425714349] [2020-07-21 11:02:23,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:02:23,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 11:02:23,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315469289] [2020-07-21 11:02:23,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 11:02:23,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:02:23,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 11:02:23,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 11:02:23,707 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 9 states. [2020-07-21 11:02:23,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:02:23,812 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-21 11:02:23,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 11:02:23,813 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-07-21 11:02:23,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:02:23,815 INFO L225 Difference]: With dead ends: 25 [2020-07-21 11:02:23,816 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 11:02:23,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 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 11:02:23,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 11:02:23,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 11:02:23,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 11:02:23,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-21 11:02:23,829 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-21 11:02:23,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:02:23,830 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-21 11:02:23,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 11:02:23,830 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-21 11:02:23,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 11:02:23,832 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:02:23,832 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:02:24,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:02:24,046 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:02:24,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:02:24,048 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-07-21 11:02:24,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:02:24,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [831637928] [2020-07-21 11:02:24,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:02:24,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:02:24,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 11:02:24,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:02:24,157 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-21 11:02:24,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:02:24,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:24,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:24,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:24,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:24,638 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 11:02:24,639 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [831637928] [2020-07-21 11:02:24,639 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:02:24,640 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 11:02:24,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481552028] [2020-07-21 11:02:24,641 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 11:02:24,642 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:02:24,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 11:02:24,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 11:02:24,643 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2020-07-21 11:02:24,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:02:24,767 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-21 11:02:24,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 11:02:24,771 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 25 [2020-07-21 11:02:24,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:02:24,772 INFO L225 Difference]: With dead ends: 28 [2020-07-21 11:02:24,773 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 11:02:24,775 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 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 11:02:24,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 11:02:24,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 11:02:24,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 11:02:24,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 11:02:24,800 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-07-21 11:02:24,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:02:24,803 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 11:02:24,803 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 11:02:24,804 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 11:02:24,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 11:02:24,806 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:02:24,807 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:02:25,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:02:25,023 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:02:25,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:02:25,024 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-07-21 11:02:25,025 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:02:25,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [49255644] [2020-07-21 11:02:25,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:02:25,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:02:25,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 11:02:25,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:02:25,184 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 11:02:25,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:02:25,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:25,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:25,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:25,831 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 11:02:25,832 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [49255644] [2020-07-21 11:02:25,832 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:02:25,832 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 11:02:25,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203107724] [2020-07-21 11:02:25,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 11:02:25,834 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:02:25,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 11:02:25,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 11:02:25,835 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 13 states. [2020-07-21 11:02:25,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:02:25,954 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-07-21 11:02:25,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 11:02:25,956 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2020-07-21 11:02:25,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:02:25,957 INFO L225 Difference]: With dead ends: 31 [2020-07-21 11:02:25,958 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 11:02:25,959 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 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 11:02:25,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 11:02:25,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 11:02:25,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 11:02:25,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-21 11:02:25,966 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-07-21 11:02:25,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:02:25,966 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-21 11:02:25,966 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 11:02:25,967 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-21 11:02:25,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 11:02:25,968 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:02:25,968 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:02:26,182 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:02:26,184 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:02:26,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:02:26,185 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-07-21 11:02:26,185 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:02:26,186 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [342562475] [2020-07-21 11:02:26,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:02:26,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:02:26,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 11:02:26,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:02:26,293 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 11:02:26,293 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:02:26,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:26,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:27,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:27,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:27,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:27,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:27,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:27,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:27,291 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-21 11:02:27,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [342562475] [2020-07-21 11:02:27,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:02:27,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 11:02:27,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921875103] [2020-07-21 11:02:27,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 11:02:27,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:02:27,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 11:02:27,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 11:02:27,294 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 15 states. [2020-07-21 11:02:27,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:02:27,408 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-07-21 11:02:27,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 11:02:27,409 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-21 11:02:27,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:02:27,411 INFO L225 Difference]: With dead ends: 34 [2020-07-21 11:02:27,411 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 11:02:27,413 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 50 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 11:02:27,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 11:02:27,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 11:02:27,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 11:02:27,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-07-21 11:02:27,419 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-07-21 11:02:27,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:02:27,420 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-07-21 11:02:27,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 11:02:27,420 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-07-21 11:02:27,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 11:02:27,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:02:27,422 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:02:27,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:02:27,624 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:02:27,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:02:27,625 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-07-21 11:02:27,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:02:27,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [62212168] [2020-07-21 11:02:27,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:02:27,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:02:27,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 11:02:27,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:02:27,736 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 11:02:27,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:02:28,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:28,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:28,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:28,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:28,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:29,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:29,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:29,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:29,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:29,169 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 11:02:29,170 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [62212168] [2020-07-21 11:02:29,170 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:02:29,170 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 11:02:29,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314354833] [2020-07-21 11:02:29,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 11:02:29,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:02:29,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 11:02:29,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 11:02:29,173 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 17 states. [2020-07-21 11:02:29,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:02:29,368 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-07-21 11:02:29,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 11:02:29,369 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 43 [2020-07-21 11:02:29,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:02:29,371 INFO L225 Difference]: With dead ends: 37 [2020-07-21 11:02:29,375 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 11:02:29,376 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 58 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 11:02:29,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 11:02:29,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 11:02:29,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 11:02:29,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-07-21 11:02:29,402 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-07-21 11:02:29,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:02:29,403 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-07-21 11:02:29,404 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 11:02:29,404 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-07-21 11:02:29,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 11:02:29,409 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:02:29,410 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:02:29,611 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:02:29,612 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:02:29,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:02:29,613 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2020-07-21 11:02:29,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:02:29,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [912885535] [2020-07-21 11:02:29,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:02:29,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:02:29,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 11:02:29,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:02:29,793 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-21 11:02:29,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:02:31,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:31,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:31,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:31,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:31,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:31,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:31,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:31,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:31,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:31,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:31,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:31,986 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 11:02:31,987 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [912885535] [2020-07-21 11:02:31,987 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:02:31,988 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 11:02:31,988 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002607675] [2020-07-21 11:02:31,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 11:02:31,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:02:31,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 11:02:31,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 11:02:31,995 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 19 states. [2020-07-21 11:02:32,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:02:32,231 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-07-21 11:02:32,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 11:02:32,232 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 49 [2020-07-21 11:02:32,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:02:32,234 INFO L225 Difference]: With dead ends: 40 [2020-07-21 11:02:32,234 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 11:02:32,235 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 66 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 11:02:32,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 11:02:32,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 11:02:32,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 11:02:32,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 11:02:32,243 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-07-21 11:02:32,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:02:32,243 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 11:02:32,244 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 11:02:32,244 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 11:02:32,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 11:02:32,245 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:02:32,246 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:02:32,451 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:02:32,452 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:02:32,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:02:32,453 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2020-07-21 11:02:32,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:02:32,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1884134839] [2020-07-21 11:02:32,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:02:32,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:02:32,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 11:02:32,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:02:32,658 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-21 11:02:32,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:02:34,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:34,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:34,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:34,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:35,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:35,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:35,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:35,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:35,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:35,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:35,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:35,773 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 11:02:35,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1884134839] [2020-07-21 11:02:35,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:02:35,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 11:02:35,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507346797] [2020-07-21 11:02:35,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 11:02:35,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:02:35,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 11:02:35,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 11:02:35,776 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 21 states. [2020-07-21 11:02:36,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:02:36,024 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-07-21 11:02:36,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 11:02:36,026 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2020-07-21 11:02:36,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:02:36,027 INFO L225 Difference]: With dead ends: 43 [2020-07-21 11:02:36,027 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 11:02:36,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 74 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 11:02:36,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 11:02:36,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-21 11:02:36,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 11:02:36,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-21 11:02:36,037 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-07-21 11:02:36,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:02:36,038 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-21 11:02:36,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 11:02:36,038 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-21 11:02:36,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-21 11:02:36,040 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:02:36,040 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:02:36,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:02:36,246 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:02:36,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:02:36,247 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2020-07-21 11:02:36,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:02:36,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1765809996] [2020-07-21 11:02:36,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:02:36,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:02:36,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 11:02:36,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:02:36,507 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-21 11:02:36,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:02:38,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:39,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:40,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:40,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:40,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:40,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:40,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:40,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:40,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:40,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:40,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:41,061 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-21 11:02:41,063 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1765809996] [2020-07-21 11:02:41,063 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:02:41,063 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 11:02:41,064 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260615881] [2020-07-21 11:02:41,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 11:02:41,065 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:02:41,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 11:02:41,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 11:02:41,067 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 23 states. [2020-07-21 11:02:41,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:02:41,331 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-07-21 11:02:41,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 11:02:41,332 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 61 [2020-07-21 11:02:41,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:02:41,334 INFO L225 Difference]: With dead ends: 46 [2020-07-21 11:02:41,334 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 11:02:41,336 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 82 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 11:02:41,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 11:02:41,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-21 11:02:41,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 11:02:41,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-07-21 11:02:41,344 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-07-21 11:02:41,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:02:41,345 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-07-21 11:02:41,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 11:02:41,345 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-07-21 11:02:41,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 11:02:41,346 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:02:41,346 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:02:41,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:02:41,557 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:02:41,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:02:41,557 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2020-07-21 11:02:41,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:02:41,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1281218131] [2020-07-21 11:02:41,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:02:41,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:02:41,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 11:02:41,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:02:41,833 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-07-21 11:02:41,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:02:44,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:44,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:45,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:45,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:46,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:46,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:47,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:47,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:47,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:47,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:47,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:48,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:48,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:48,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:48,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:02:48,228 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-07-21 11:02:48,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1281218131] [2020-07-21 11:02:48,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:02:48,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-21 11:02:48,229 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776315972] [2020-07-21 11:02:48,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 11:02:48,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:02:48,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 11:02:48,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-21 11:02:48,232 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 24 states. [2020-07-21 11:02:48,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:02:48,493 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-07-21 11:02:48,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 11:02:48,494 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 67 [2020-07-21 11:02:48,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:02:48,495 INFO L225 Difference]: With dead ends: 49 [2020-07-21 11:02:48,496 INFO L226 Difference]: Without dead ends: 45 [2020-07-21 11:02:48,497 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 90 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 11:02:48,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-21 11:02:48,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-07-21 11:02:48,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 11:02:48,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-07-21 11:02:48,504 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-07-21 11:02:48,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:02:48,505 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-07-21 11:02:48,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 11:02:48,505 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-07-21 11:02:48,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-21 11:02:48,506 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:02:48,507 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:02:48,721 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:02:48,722 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:02:48,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:02:48,723 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2020-07-21 11:02:48,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:02:48,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964837634] [2020-07-21 11:02:48,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:02:48,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:02:48,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-21 11:02:48,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:02:49,340 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-07-21 11:02:49,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:02:50,537 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-07-21 11:02:50,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [964837634] [2020-07-21 11:02:50,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:02:50,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2020-07-21 11:02:50,539 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435822881] [2020-07-21 11:02:50,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 11:02:50,540 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:02:50,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 11:02:50,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-07-21 11:02:50,541 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 25 states. [2020-07-21 11:02:50,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:02:50,928 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-07-21 11:02:50,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 11:02:50,929 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 73 [2020-07-21 11:02:50,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:02:50,932 INFO L225 Difference]: With dead ends: 52 [2020-07-21 11:02:50,932 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 11:02:50,933 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-07-21 11:02:50,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 11:02:50,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-21 11:02:50,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 11:02:50,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-07-21 11:02:50,952 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-07-21 11:02:50,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:02:50,952 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-07-21 11:02:50,952 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 11:02:50,953 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-07-21 11:02:50,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-21 11:02:50,954 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:02:50,956 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:02:51,169 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:02:51,170 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:02:51,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:02:51,171 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2020-07-21 11:02:51,171 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:02:51,171 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119917881] [2020-07-21 11:02:51,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:02:51,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:02:51,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 11:02:51,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:02:51,574 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 187 proven. 0 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-07-21 11:02:51,575 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:02:51,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119917881] [2020-07-21 11:02:51,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:02:51,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2020-07-21 11:02:51,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687317069] [2020-07-21 11:02:51,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 11:02:51,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:02:51,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 11:02:51,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-07-21 11:02:51,578 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2020-07-21 11:02:51,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:02:51,819 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2020-07-21 11:02:51,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 11:02:51,820 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2020-07-21 11:02:51,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:02:51,821 INFO L225 Difference]: With dead ends: 48 [2020-07-21 11:02:51,821 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 11:02:51,823 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=275, Invalid=481, Unknown=0, NotChecked=0, Total=756 [2020-07-21 11:02:51,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 11:02:51,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 11:02:51,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 11:02:51,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 11:02:51,824 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 79 [2020-07-21 11:02:51,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:02:51,824 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 11:02:51,824 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 11:02:51,824 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 11:02:51,824 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 11:02:52,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:02:52,029 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 11:02:52,121 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 11:02:52,122 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 11:02:52,122 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 11:02:52,122 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 11:02:52,122 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 11:02:52,122 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 11:02:52,125 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 13) no Hoare annotation was computed. [2020-07-21 11:02:52,125 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 9 15) the Hoare annotation is: true [2020-07-21 11:02:52,125 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 9 15) no Hoare annotation was computed. [2020-07-21 11:02:52,125 INFO L268 CegarLoopResult]: For program point L13(line 13) no Hoare annotation was computed. [2020-07-21 11:02:52,125 INFO L268 CegarLoopResult]: For program point L12(lines 12 14) no Hoare annotation was computed. [2020-07-21 11:02:52,126 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= 10 main_~input~0) (<= main_~input~0 10)) [2020-07-21 11:02:52,126 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-21 11:02:52,126 INFO L268 CegarLoopResult]: For program point L12-2(lines 9 15) no Hoare annotation was computed. [2020-07-21 11:02:52,126 INFO L268 CegarLoopResult]: For program point idFINAL(lines 4 7) no Hoare annotation was computed. [2020-07-21 11:02:52,127 INFO L268 CegarLoopResult]: For program point idEXIT(lines 4 7) no Hoare annotation was computed. [2020-07-21 11:02:52,127 INFO L271 CegarLoopResult]: At program point idENTRY(lines 4 7) the Hoare annotation is: true [2020-07-21 11:02:52,127 INFO L264 CegarLoopResult]: At program point L6(line 6) the Hoare annotation is: (and (<= |id_#in~x| id_~x) (<= id_~x |id_#in~x|)) [2020-07-21 11:02:52,127 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-07-21 11:02:52,127 INFO L268 CegarLoopResult]: For program point L6-1(line 6) no Hoare annotation was computed. [2020-07-21 11:02:52,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 11:02:52 BoogieIcfgContainer [2020-07-21 11:02:52,134 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 11:02:52,137 INFO L168 Benchmark]: Toolchain (without parser) took 30295.84 ms. Allocated memory was 136.8 MB in the beginning and 435.7 MB in the end (delta: 298.8 MB). Free memory was 101.8 MB in the beginning and 243.7 MB in the end (delta: -141.9 MB). Peak memory consumption was 156.9 MB. Max. memory is 7.1 GB. [2020-07-21 11:02:52,138 INFO L168 Benchmark]: CDTParser took 0.32 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 11:02:52,139 INFO L168 Benchmark]: CACSL2BoogieTranslator took 243.97 ms. Allocated memory is still 136.8 MB. Free memory was 101.4 MB in the beginning and 92.2 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-21 11:02:52,140 INFO L168 Benchmark]: Boogie Preprocessor took 31.70 ms. Allocated memory is still 136.8 MB. Free memory was 92.2 MB in the beginning and 90.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 11:02:52,140 INFO L168 Benchmark]: RCFGBuilder took 375.24 ms. Allocated memory was 136.8 MB in the beginning and 201.9 MB in the end (delta: 65.0 MB). Free memory was 90.8 MB in the beginning and 170.3 MB in the end (delta: -79.5 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-21 11:02:52,141 INFO L168 Benchmark]: TraceAbstraction took 29637.62 ms. Allocated memory was 201.9 MB in the beginning and 435.7 MB in the end (delta: 233.8 MB). Free memory was 170.3 MB in the beginning and 243.7 MB in the end (delta: -73.3 MB). Peak memory consumption was 160.5 MB. Max. memory is 7.1 GB. [2020-07-21 11:02:52,147 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 243.97 ms. Allocated memory is still 136.8 MB. Free memory was 101.4 MB in the beginning and 92.2 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 31.70 ms. Allocated memory is still 136.8 MB. Free memory was 92.2 MB in the beginning and 90.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 375.24 ms. Allocated memory was 136.8 MB in the beginning and 201.9 MB in the end (delta: 65.0 MB). Free memory was 90.8 MB in the beginning and 170.3 MB in the end (delta: -79.5 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 29637.62 ms. Allocated memory was 201.9 MB in the beginning and 435.7 MB in the end (delta: 233.8 MB). Free memory was 170.3 MB in the beginning and 243.7 MB in the end (delta: -73.3 MB). Peak memory consumption was 160.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 13]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 29.4s, OverallIterations: 12, TraceHistogramMax: 12, AutomataDifference: 2.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 200 SDtfs, 514 SDslu, 1542 SDs, 0 SdLazy, 830 SolverSat, 198 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1067 GetRequests, 717 SyntacticMatches, 109 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1124 ImplicationChecksByTransitivity, 3.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=48occurred in iteration=11, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 12 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 19 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 22.9s InterpolantComputationTime, 552 NumberOfCodeBlocks, 552 NumberOfCodeBlocksAsserted, 12 NumberOfCheckSat, 990 ConstructedInterpolants, 0 QuantifiedInterpolants, 142320 SizeOfPredicates, 78 NumberOfNonLiveVariables, 1296 ConjunctsInSsa, 203 ConjunctsInUnsatCore, 22 InterpolantComputations, 2 PerfectInterpolantSequences, 1299/2794 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...