/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_10x0-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:10:24,227 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:10:24,230 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:10:24,244 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:10:24,245 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:10:24,246 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:10:24,248 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:10:24,250 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:10:24,252 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:10:24,253 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:10:24,254 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:10:24,255 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:10:24,256 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:10:24,257 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:10:24,258 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:10:24,259 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:10:24,260 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:10:24,262 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:10:24,264 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:10:24,266 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:10:24,268 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:10:24,269 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:10:24,271 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:10:24,272 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:10:24,275 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:10:24,285 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:10:24,286 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:10:24,287 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:10:24,288 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 16:10:24,306 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:10:24,307 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:10:24,308 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:10:24,309 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:10:24,309 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:10:24,309 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:10:24,309 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:10:24,310 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:10:24,310 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:10:24,310 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:10:24,310 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:10:24,310 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:10:24,311 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:10:24,311 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:10:24,311 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:10:24,311 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:10:24,311 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:10:24,312 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:10:24,312 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:10:24,312 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:10:24,312 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:10:24,313 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:10:24,313 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:10:24,313 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:10:24,313 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:10:24,313 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:10:24,314 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:24,314 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:10:24,314 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:10:24,314 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:10:24,647 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:10:24,664 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:10:24,669 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:10:24,671 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:10:24,671 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:10:24,672 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_10x0-1.c [2020-07-21 16:10:24,774 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4e9b06320/8388818d02f449178a94f04d7349d7bb/FLAGb4751eb14 [2020-07-21 16:10:25,370 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:10:25,371 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_10x0-1.c [2020-07-21 16:10:25,383 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4e9b06320/8388818d02f449178a94f04d7349d7bb/FLAGb4751eb14 [2020-07-21 16:10:25,658 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4e9b06320/8388818d02f449178a94f04d7349d7bb [2020-07-21 16:10:25,674 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:10:25,679 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:10:25,681 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:10:25,681 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:10:25,688 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:10:25,691 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:10:25" (1/1) ... [2020-07-21 16:10:25,695 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@76573965 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:10:25, skipping insertion in model container [2020-07-21 16:10:25,696 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:10:25" (1/1) ... [2020-07-21 16:10:25,710 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:10:25,739 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:10:25,958 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:10:25,965 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:10:25,984 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:10:26,000 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:10:26,001 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:10:26 WrapperNode [2020-07-21 16:10:26,001 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:10:26,002 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:10:26,003 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:10:26,003 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:10:26,019 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:10:26" (1/1) ... [2020-07-21 16:10:26,020 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:10:26" (1/1) ... [2020-07-21 16:10:26,026 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:10:26" (1/1) ... [2020-07-21 16:10:26,027 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:10:26" (1/1) ... [2020-07-21 16:10:26,032 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:10:26" (1/1) ... [2020-07-21 16:10:26,034 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:10:26" (1/1) ... [2020-07-21 16:10:26,035 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:10:26" (1/1) ... [2020-07-21 16:10:26,037 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:10:26,037 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:10:26,038 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:10:26,038 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:10:26,039 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:10:26" (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 16:10:26,241 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:10:26,241 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:10:26,241 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-07-21 16:10:26,242 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:10:26,242 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:10:26,244 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-07-21 16:10:26,244 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:10:26,244 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:10:26,244 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:10:26,454 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:10:26,455 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 16:10:26,460 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:10:26 BoogieIcfgContainer [2020-07-21 16:10:26,460 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:10:26,462 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:10:26,463 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:10:26,467 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:10:26,467 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:10:25" (1/3) ... [2020-07-21 16:10:26,469 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bbb5b10 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:10:26, skipping insertion in model container [2020-07-21 16:10:26,469 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:10:26" (2/3) ... [2020-07-21 16:10:26,470 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bbb5b10 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:10:26, skipping insertion in model container [2020-07-21 16:10:26,470 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:10:26" (3/3) ... [2020-07-21 16:10:26,472 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_10x0-1.c [2020-07-21 16:10:26,488 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:10:26,500 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:10:26,520 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:10:26,555 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:10:26,556 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:10:26,556 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:10:26,556 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:10:26,556 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:10:26,557 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:10:26,557 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:10:26,557 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:10:26,627 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 16:10:26,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 16:10:26,653 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:26,656 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:10:26,660 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:26,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:26,683 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-07-21 16:10:26,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:26,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116563397] [2020-07-21 16:10:26,709 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:26,797 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:10:26,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:26,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:10:26,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:26,907 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 16:10:26,907 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:10:26,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116563397] [2020-07-21 16:10:26,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:10:26,911 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:10:26,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625336229] [2020-07-21 16:10:26,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:10:26,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:10:26,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:10:26,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:10:26,940 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 16:10:27,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:27,067 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-21 16:10:27,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:10:27,071 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 16:10:27,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:27,084 INFO L225 Difference]: With dead ends: 30 [2020-07-21 16:10:27,084 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 16:10:27,089 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 16:10:27,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 16:10:27,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 16:10:27,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 16:10:27,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 16:10:27,143 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 16:10:27,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:27,144 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 16:10:27,144 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:10:27,144 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 16:10:27,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 16:10:27,147 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:27,147 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 16:10:27,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:27,364 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:27,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:27,365 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-07-21 16:10:27,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:27,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1543249888] [2020-07-21 16:10:27,367 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:27,404 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:10:27,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:27,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:10:27,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:27,490 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 16:10:27,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:27,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:27,811 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 16:10:27,812 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1543249888] [2020-07-21 16:10:27,812 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:10:27,812 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 16:10:27,813 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396345667] [2020-07-21 16:10:27,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 16:10:27,815 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:10:27,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 16:10:27,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:10:27,817 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 9 states. [2020-07-21 16:10:27,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:27,926 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-21 16:10:27,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 16:10:27,928 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-07-21 16:10:27,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:27,929 INFO L225 Difference]: With dead ends: 25 [2020-07-21 16:10:27,929 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 16:10:27,932 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 16:10:27,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 16:10:27,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 16:10:27,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 16:10:27,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-21 16:10:27,940 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-21 16:10:27,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:27,941 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-21 16:10:27,941 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 16:10:27,941 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-21 16:10:27,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 16:10:27,943 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:27,943 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 16:10:28,157 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:28,158 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:28,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:28,159 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-07-21 16:10:28,160 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:28,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1755276865] [2020-07-21 16:10:28,160 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:28,203 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:10:28,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:28,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:10:28,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:28,287 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 16:10:28,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:28,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:28,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:28,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:28,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:28,710 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 16:10:28,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1755276865] [2020-07-21 16:10:28,711 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:10:28,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 16:10:28,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833534132] [2020-07-21 16:10:28,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 16:10:28,713 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:10:28,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 16:10:28,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:10:28,714 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2020-07-21 16:10:28,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:28,813 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-21 16:10:28,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:10:28,813 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 25 [2020-07-21 16:10:28,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:28,815 INFO L225 Difference]: With dead ends: 28 [2020-07-21 16:10:28,815 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 16:10:28,816 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 16:10:28,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 16:10:28,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 16:10:28,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 16:10:28,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-21 16:10:28,824 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-07-21 16:10:28,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:28,825 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-21 16:10:28,825 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 16:10:28,825 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-21 16:10:28,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 16:10:28,827 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:28,827 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 16:10:29,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:29,043 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:29,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:29,044 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2020-07-21 16:10:29,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:29,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1054235309] [2020-07-21 16:10:29,045 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:29,109 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:10:29,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:29,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:10:29,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:29,178 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 16:10:29,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:29,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:29,575 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:29,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:29,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:29,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:29,813 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 16:10:29,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1054235309] [2020-07-21 16:10:29,814 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:10:29,814 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 16:10:29,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043216218] [2020-07-21 16:10:29,816 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 16:10:29,816 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:10:29,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 16:10:29,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:10:29,817 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 13 states. [2020-07-21 16:10:29,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:29,944 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-07-21 16:10:29,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:10:29,946 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2020-07-21 16:10:29,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:29,947 INFO L225 Difference]: With dead ends: 31 [2020-07-21 16:10:29,948 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 16:10:29,949 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 16:10:29,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 16:10:29,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 16:10:29,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 16:10:29,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-21 16:10:29,956 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-07-21 16:10:29,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:29,957 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-21 16:10:29,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 16:10:29,957 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-21 16:10:29,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 16:10:29,959 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:29,959 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 16:10:30,166 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:30,167 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:30,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:30,168 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2020-07-21 16:10:30,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:30,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [219001730] [2020-07-21 16:10:30,170 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:30,212 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:10:30,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:30,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:10:30,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:30,289 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 16:10:30,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:30,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:31,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:31,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:31,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:31,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:31,337 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 16:10:31,338 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [219001730] [2020-07-21 16:10:31,338 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:10:31,338 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 16:10:31,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036964028] [2020-07-21 16:10:31,339 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 16:10:31,340 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:10:31,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 16:10:31,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:10:31,341 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 15 states. [2020-07-21 16:10:31,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:31,473 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-07-21 16:10:31,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:10:31,476 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-21 16:10:31,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:31,478 INFO L225 Difference]: With dead ends: 34 [2020-07-21 16:10:31,479 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 16:10:31,483 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 16:10:31,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 16:10:31,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 16:10:31,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:10:31,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-07-21 16:10:31,500 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-07-21 16:10:31,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:31,504 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-07-21 16:10:31,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 16:10:31,505 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-07-21 16:10:31,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 16:10:31,506 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:31,506 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 16:10:31,707 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:31,708 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:31,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:31,709 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2020-07-21 16:10:31,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:31,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [18553290] [2020-07-21 16:10:31,711 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:31,773 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:10:31,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:31,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:10:31,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:31,886 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 16:10:31,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:32,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:32,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:32,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:33,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:33,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:33,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:33,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:33,307 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 16:10:33,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [18553290] [2020-07-21 16:10:33,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:10:33,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 16:10:33,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669560669] [2020-07-21 16:10:33,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:10:33,310 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:10:33,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:10:33,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:10:33,311 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 17 states. [2020-07-21 16:10:33,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:33,511 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-07-21 16:10:33,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:10:33,514 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 43 [2020-07-21 16:10:33,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:33,516 INFO L225 Difference]: With dead ends: 37 [2020-07-21 16:10:33,516 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 16:10:33,520 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 16:10:33,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 16:10:33,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 16:10:33,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 16:10:33,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-07-21 16:10:33,538 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-07-21 16:10:33,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:33,541 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-07-21 16:10:33,541 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:10:33,542 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-07-21 16:10:33,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 16:10:33,544 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:33,544 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 16:10:33,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:33,762 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:33,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:33,762 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2020-07-21 16:10:33,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:33,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1440358212] [2020-07-21 16:10:33,764 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:33,830 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:10:33,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:33,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:10:33,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:33,930 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 16:10:33,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:35,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:35,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:35,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:35,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:35,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:35,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:36,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:36,137 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 16:10:36,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1440358212] [2020-07-21 16:10:36,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:10:36,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 16:10:36,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229768177] [2020-07-21 16:10:36,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:10:36,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:10:36,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:10:36,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:10:36,144 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 19 states. [2020-07-21 16:10:36,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:36,337 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-07-21 16:10:36,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:10:36,338 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 49 [2020-07-21 16:10:36,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:36,340 INFO L225 Difference]: With dead ends: 40 [2020-07-21 16:10:36,340 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 16:10:36,341 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 66 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:10:36,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 16:10:36,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 16:10:36,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 16:10:36,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-21 16:10:36,349 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-07-21 16:10:36,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:36,350 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-21 16:10:36,350 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:10:36,350 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-21 16:10:36,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 16:10:36,351 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:36,351 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 16:10:36,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:36,556 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:36,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:36,557 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2020-07-21 16:10:36,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:36,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1397752298] [2020-07-21 16:10:36,558 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:36,640 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:10:36,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:36,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:10:36,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:36,765 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 16:10:36,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:38,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:38,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:39,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:39,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:39,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:39,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:39,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:39,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:39,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:39,888 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 16:10:39,888 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1397752298] [2020-07-21 16:10:39,889 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:10:39,889 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 16:10:39,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651083165] [2020-07-21 16:10:39,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:10:39,890 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:10:39,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:10:39,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:10:39,891 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 21 states. [2020-07-21 16:10:40,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:40,144 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-07-21 16:10:40,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:10:40,148 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2020-07-21 16:10:40,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:40,150 INFO L225 Difference]: With dead ends: 43 [2020-07-21 16:10:40,150 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 16:10:40,151 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 16:10:40,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 16:10:40,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-21 16:10:40,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 16:10:40,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-21 16:10:40,161 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-07-21 16:10:40,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:40,162 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-21 16:10:40,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:10:40,162 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-21 16:10:40,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-21 16:10:40,164 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:40,164 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 16:10:40,365 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:40,366 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:40,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:40,367 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2020-07-21 16:10:40,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:40,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1381991833] [2020-07-21 16:10:40,369 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:40,482 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:10:40,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:40,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:10:40,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:40,664 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 16:10:40,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:42,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:42,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:43,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:44,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:44,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:44,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:44,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:44,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:44,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:44,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:44,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:45,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:45,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:45,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:45,198 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 16:10:45,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1381991833] [2020-07-21 16:10:45,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:10:45,200 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 16:10:45,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015903519] [2020-07-21 16:10:45,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:10:45,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:10:45,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:10:45,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:10:45,206 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 23 states. [2020-07-21 16:10:45,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:45,462 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-07-21 16:10:45,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:10:45,463 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 61 [2020-07-21 16:10:45,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:45,465 INFO L225 Difference]: With dead ends: 46 [2020-07-21 16:10:45,465 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 16:10:45,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 82 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 16:10:45,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 16:10:45,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-21 16:10:45,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 16:10:45,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-07-21 16:10:45,474 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-07-21 16:10:45,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:45,475 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-07-21 16:10:45,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:10:45,475 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-07-21 16:10:45,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 16:10:45,476 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:45,476 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 16:10:45,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:45,685 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:45,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:45,686 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2020-07-21 16:10:45,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:45,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1661985160] [2020-07-21 16:10:45,688 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:45,880 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:10:45,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:45,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:10:45,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:46,011 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 16:10:46,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:49,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:49,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:50,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:50,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:51,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:51,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:52,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:52,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:52,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:52,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:52,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:52,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:52,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:52,436 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 16:10:52,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1661985160] [2020-07-21 16:10:52,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:10:52,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 24 [2020-07-21 16:10:52,438 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233704361] [2020-07-21 16:10:52,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 16:10:52,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:10:52,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 16:10:52,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:10:52,440 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 24 states. [2020-07-21 16:10:52,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:10:52,690 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-07-21 16:10:52,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:10:52,691 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 67 [2020-07-21 16:10:52,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:10:52,693 INFO L225 Difference]: With dead ends: 49 [2020-07-21 16:10:52,694 INFO L226 Difference]: Without dead ends: 45 [2020-07-21 16:10:52,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 90 SyntacticMatches, 21 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 16:10:52,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-21 16:10:52,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-07-21 16:10:52,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 16:10:52,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-07-21 16:10:52,703 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-07-21 16:10:52,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:10:52,704 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-07-21 16:10:52,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 16:10:52,704 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-07-21 16:10:52,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-21 16:10:52,706 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:10:52,706 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 16:10:52,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:52,921 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:10:52,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:10:52,922 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2020-07-21 16:10:52,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:10:52,923 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1308351287] [2020-07-21 16:10:52,923 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:10:53,134 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:10:53,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:10:53,139 WARN L261 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 115 conjunts are in the unsatisfiable core [2020-07-21 16:10:53,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:10:53,822 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 16:10:53,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:10:58,572 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-21 16:10:59,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 16:10:59,361 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:10:59,362 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:10:59,363 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:10:59,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:10:59,366 INFO L501 QuantifierPusher]: Distributing 5 disjuncts over 2 conjuncts [2020-07-21 16:10:59,367 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:10:59,368 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:10:59,370 INFO L501 QuantifierPusher]: Distributing 6 disjuncts over 2 conjuncts [2020-07-21 16:10:59,371 INFO L501 QuantifierPusher]: Distributing 5 disjuncts over 2 conjuncts [2020-07-21 16:10:59,372 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:10:59,373 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:10:59,374 INFO L501 QuantifierPusher]: Distributing 6 disjuncts over 2 conjuncts [2020-07-21 16:11:01,120 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 16:11:01,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 16:11:01,814 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:01,815 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:01,817 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:01,818 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:01,821 INFO L501 QuantifierPusher]: Distributing 7 disjuncts over 2 conjuncts [2020-07-21 16:11:01,822 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:01,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:01,825 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:01,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:01,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:01,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:01,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:01,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:03,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 16:11:03,657 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:03,658 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:03,659 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:03,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:03,660 INFO L501 QuantifierPusher]: Distributing 5 disjuncts over 2 conjuncts [2020-07-21 16:11:03,661 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:03,663 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:03,664 INFO L501 QuantifierPusher]: Distributing 6 disjuncts over 2 conjuncts [2020-07-21 16:11:03,666 INFO L501 QuantifierPusher]: Distributing 5 disjuncts over 2 conjuncts [2020-07-21 16:11:03,667 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:03,668 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:03,672 INFO L501 QuantifierPusher]: Distributing 6 disjuncts over 2 conjuncts [2020-07-21 16:11:05,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 16:11:05,111 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:05,112 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:05,113 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:05,114 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:05,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:05,116 INFO L501 QuantifierPusher]: Distributing 7 disjuncts over 2 conjuncts [2020-07-21 16:11:05,117 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:05,118 INFO L501 QuantifierPusher]: Distributing 6 disjuncts over 2 conjuncts [2020-07-21 16:11:05,119 INFO L501 QuantifierPusher]: Distributing 7 disjuncts over 2 conjuncts [2020-07-21 16:11:05,121 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:05,121 INFO L501 QuantifierPusher]: Distributing 6 disjuncts over 2 conjuncts [2020-07-21 16:11:06,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 16:11:06,185 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:06,186 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:06,187 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:06,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:06,188 INFO L501 QuantifierPusher]: Distributing 5 disjuncts over 2 conjuncts [2020-07-21 16:11:06,189 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:06,190 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:06,191 INFO L501 QuantifierPusher]: Distributing 6 disjuncts over 2 conjuncts [2020-07-21 16:11:06,193 INFO L501 QuantifierPusher]: Distributing 5 disjuncts over 2 conjuncts [2020-07-21 16:11:06,194 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:06,194 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:06,196 INFO L501 QuantifierPusher]: Distributing 6 disjuncts over 2 conjuncts [2020-07-21 16:11:07,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 16:11:07,123 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:07,124 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:07,126 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:07,127 INFO L501 QuantifierPusher]: Distributing 5 disjuncts over 2 conjuncts [2020-07-21 16:11:07,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:07,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:07,130 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:07,131 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:07,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:07,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:07,134 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:07,135 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:07,136 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:07,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 16:11:07,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 16:11:07,815 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:07,816 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:07,817 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:07,818 INFO L501 QuantifierPusher]: Distributing 5 disjuncts over 2 conjuncts [2020-07-21 16:11:07,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:07,820 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:07,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:07,822 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:07,823 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:07,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:07,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:07,826 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:08,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 16:11:08,352 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:08,353 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:08,354 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:08,354 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:08,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:08,356 INFO L501 QuantifierPusher]: Distributing 7 disjuncts over 2 conjuncts [2020-07-21 16:11:08,356 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:08,357 INFO L501 QuantifierPusher]: Distributing 6 disjuncts over 2 conjuncts [2020-07-21 16:11:08,358 INFO L501 QuantifierPusher]: Distributing 7 disjuncts over 2 conjuncts [2020-07-21 16:11:08,359 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:08,359 INFO L501 QuantifierPusher]: Distributing 6 disjuncts over 2 conjuncts [2020-07-21 16:11:08,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 16:11:08,802 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:08,803 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:08,804 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:08,804 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:08,805 INFO L501 QuantifierPusher]: Distributing 7 disjuncts over 2 conjuncts [2020-07-21 16:11:08,805 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:08,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:08,807 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:08,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:08,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:08,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:08,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:08,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:09,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 16:11:09,153 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:09,154 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:09,155 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 3 conjuncts [2020-07-21 16:11:09,156 INFO L501 QuantifierPusher]: Distributing 5 disjuncts over 2 conjuncts [2020-07-21 16:11:09,157 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:09,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:09,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:09,160 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:09,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:09,163 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:09,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:09,165 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-21 16:11:09,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-07-21 16:11:09,411 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-07-21 16:11:09,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1308351287] [2020-07-21 16:11:09,412 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:11:09,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 37] total 61 [2020-07-21 16:11:09,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099845165] [2020-07-21 16:11:09,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-07-21 16:11:09,413 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:11:09,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-07-21 16:11:09,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=855, Invalid=2805, Unknown=0, NotChecked=0, Total=3660 [2020-07-21 16:11:09,416 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 61 states. [2020-07-21 16:11:10,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:11:10,786 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-07-21 16:11:10,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-21 16:11:10,788 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 73 [2020-07-21 16:11:10,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:11:10,790 INFO L225 Difference]: With dead ends: 52 [2020-07-21 16:11:10,791 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 16:11:10,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1647 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=1591, Invalid=5051, Unknown=0, NotChecked=0, Total=6642 [2020-07-21 16:11:10,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 16:11:10,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-21 16:11:10,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 16:11:10,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-07-21 16:11:10,801 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-07-21 16:11:10,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:11:10,802 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-07-21 16:11:10,802 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-07-21 16:11:10,802 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-07-21 16:11:10,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-21 16:11:10,803 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:11:10,803 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 16:11:11,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:11,014 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:11:11,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:11:11,015 INFO L82 PathProgramCache]: Analyzing trace with hash -2010530748, now seen corresponding path program 11 times [2020-07-21 16:11:11,016 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:11:11,016 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1064710724] [2020-07-21 16:11:11,016 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:11,305 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:11:11,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:11:11,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:11:11,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:11:11,531 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 187 proven. 21 refuted. 0 times theorem prover too weak. 166 trivial. 0 not checked. [2020-07-21 16:11:11,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:11:12,874 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 16:11:16,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:17,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:19,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:20,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:20,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:20,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:20,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:21,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:21,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:21,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:21,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:21,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:21,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:21,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:21,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:11:21,992 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 187 proven. 121 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 16:11:21,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1064710724] [2020-07-21 16:11:21,994 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:11:21,994 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 26 [2020-07-21 16:11:21,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492638678] [2020-07-21 16:11:21,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 16:11:21,995 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:11:21,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 16:11:21,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=469, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:11:21,996 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 26 states. [2020-07-21 16:11:22,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:11:22,312 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2020-07-21 16:11:22,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 16:11:22,314 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 79 [2020-07-21 16:11:22,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:11:22,315 INFO L225 Difference]: With dead ends: 48 [2020-07-21 16:11:22,315 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 16:11:22,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 121 SyntacticMatches, 23 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=456, Invalid=876, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:11:22,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 16:11:22,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 16:11:22,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 16:11:22,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 16:11:22,319 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 79 [2020-07-21 16:11:22,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:11:22,319 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 16:11:22,319 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 16:11:22,319 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 16:11:22,319 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 16:11:22,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:11:22,524 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 16:11:22,687 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 16:11:22,688 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:11:22,688 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:11:22,688 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 16:11:22,688 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 16:11:22,688 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 16:11:22,689 INFO L268 CegarLoopResult]: For program point sumEXIT(lines 3 9) no Hoare annotation was computed. [2020-07-21 16:11:22,689 INFO L264 CegarLoopResult]: At program point L7(line 7) the Hoare annotation is: (and (= sum_~m |sum_#in~m|) (<= sum_~n |sum_#in~n|) (<= 1 |sum_#in~n|) (<= |sum_#in~n| sum_~n)) [2020-07-21 16:11:22,691 INFO L268 CegarLoopResult]: For program point L7-1(line 7) no Hoare annotation was computed. [2020-07-21 16:11:22,691 INFO L268 CegarLoopResult]: For program point L4(lines 4 8) no Hoare annotation was computed. [2020-07-21 16:11:22,691 INFO L268 CegarLoopResult]: For program point sumFINAL(lines 3 9) no Hoare annotation was computed. [2020-07-21 16:11:22,691 INFO L271 CegarLoopResult]: At program point sumENTRY(lines 3 9) the Hoare annotation is: true [2020-07-21 16:11:22,692 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 16) no Hoare annotation was computed. [2020-07-21 16:11:22,692 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 11 18) the Hoare annotation is: true [2020-07-21 16:11:22,692 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 11 18) no Hoare annotation was computed. [2020-07-21 16:11:22,692 INFO L268 CegarLoopResult]: For program point L16(line 16) no Hoare annotation was computed. [2020-07-21 16:11:22,693 INFO L268 CegarLoopResult]: For program point L15(lines 15 17) no Hoare annotation was computed. [2020-07-21 16:11:22,693 INFO L264 CegarLoopResult]: At program point L14(line 14) the Hoare annotation is: (and (<= main_~a~0 10) (<= 10 main_~a~0)) [2020-07-21 16:11:22,693 INFO L268 CegarLoopResult]: For program point L14-1(line 14) no Hoare annotation was computed. [2020-07-21 16:11:22,693 INFO L268 CegarLoopResult]: For program point L15-2(lines 11 18) no Hoare annotation was computed. [2020-07-21 16:11:22,707 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:11:22 BoogieIcfgContainer [2020-07-21 16:11:22,707 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:11:22,717 INFO L168 Benchmark]: Toolchain (without parser) took 57033.49 ms. Allocated memory was 143.7 MB in the beginning and 510.7 MB in the end (delta: 367.0 MB). Free memory was 100.0 MB in the beginning and 125.6 MB in the end (delta: -25.6 MB). Peak memory consumption was 341.4 MB. Max. memory is 7.1 GB. [2020-07-21 16:11:22,718 INFO L168 Benchmark]: CDTParser took 0.30 ms. Allocated memory is still 143.7 MB. Free memory was 118.6 MB in the beginning and 118.4 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 16:11:22,721 INFO L168 Benchmark]: CACSL2BoogieTranslator took 321.32 ms. Allocated memory is still 143.7 MB. Free memory was 99.6 MB in the beginning and 90.4 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-21 16:11:22,728 INFO L168 Benchmark]: Boogie Preprocessor took 34.31 ms. Allocated memory is still 143.7 MB. Free memory was 90.4 MB in the beginning and 89.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 16:11:22,729 INFO L168 Benchmark]: RCFGBuilder took 423.00 ms. Allocated memory was 143.7 MB in the beginning and 201.9 MB in the end (delta: 58.2 MB). Free memory was 89.0 MB in the beginning and 169.9 MB in the end (delta: -80.9 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-21 16:11:22,738 INFO L168 Benchmark]: TraceAbstraction took 56245.20 ms. Allocated memory was 201.9 MB in the beginning and 510.7 MB in the end (delta: 308.8 MB). Free memory was 169.9 MB in the beginning and 125.6 MB in the end (delta: 44.4 MB). Peak memory consumption was 353.2 MB. Max. memory is 7.1 GB. [2020-07-21 16:11:22,745 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30 ms. Allocated memory is still 143.7 MB. Free memory was 118.6 MB in the beginning and 118.4 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 321.32 ms. Allocated memory is still 143.7 MB. Free memory was 99.6 MB in the beginning and 90.4 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 34.31 ms. Allocated memory is still 143.7 MB. Free memory was 90.4 MB in the beginning and 89.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 423.00 ms. Allocated memory was 143.7 MB in the beginning and 201.9 MB in the end (delta: 58.2 MB). Free memory was 89.0 MB in the beginning and 169.9 MB in the end (delta: -80.9 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 56245.20 ms. Allocated memory was 201.9 MB in the beginning and 510.7 MB in the end (delta: 308.8 MB). Free memory was 169.9 MB in the beginning and 125.6 MB in the end (delta: 44.4 MB). Peak memory consumption was 353.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 16]: 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: 55.9s, OverallIterations: 12, TraceHistogramMax: 12, AutomataDifference: 3.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 164 SDtfs, 602 SDslu, 1014 SDs, 0 SdLazy, 776 SolverSat, 314 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1177 GetRequests, 737 SyntacticMatches, 133 SemanticMatches, 307 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3036 ImplicationChecksByTransitivity, 8.5s 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, 25 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 48.1s InterpolantComputationTime, 552 NumberOfCodeBlocks, 357 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 1068 ConstructedInterpolants, 0 QuantifiedInterpolants, 274896 SizeOfPredicates, 103 NumberOfNonLiveVariables, 1290 ConjunctsInSsa, 269 ConjunctsInUnsatCore, 23 InterpolantComputations, 1 PerfectInterpolantSequences, 1431/3168 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...