/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 BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/nested6.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 01:47:54,043 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 01:47:54,048 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 01:47:54,068 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 01:47:54,068 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 01:47:54,071 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 01:47:54,073 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 01:47:54,084 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 01:47:54,090 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 01:47:54,093 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 01:47:54,095 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 01:47:54,096 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 01:47:54,097 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 01:47:54,100 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 01:47:54,102 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 01:47:54,104 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 01:47:54,105 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 01:47:54,106 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 01:47:54,108 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 01:47:54,113 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 01:47:54,119 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 01:47:54,123 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 01:47:54,124 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 01:47:54,125 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 01:47:54,128 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 01:47:54,139 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 01:47:54,139 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 01:47:54,141 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 01:47:54,142 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 01:47:54,168 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 01:47:54,169 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 01:47:54,170 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 01:47:54,170 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 01:47:54,174 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 01:47:54,175 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 01:47:54,175 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 01:47:54,175 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 01:47:54,175 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 01:47:54,175 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 01:47:54,176 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 01:47:54,176 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 01:47:54,176 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 01:47:54,176 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 01:47:54,176 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 01:47:54,177 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 01:47:54,177 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 01:47:54,177 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 01:47:54,177 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 01:47:54,177 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 01:47:54,178 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 01:47:54,178 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:47:54,178 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 01:47:54,178 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 01:47:54,178 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 01:47:54,179 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 01:47:54,179 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:54,179 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 01:47:54,179 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 01:47:54,179 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 -> BIGGEST_EQUIVALENCE_CLASS 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 -> 4 [2020-07-21 01:47:54,531 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 01:47:54,545 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 01:47:54,549 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 01:47:54,551 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 01:47:54,551 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 01:47:54,552 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/nested6.i [2020-07-21 01:47:54,622 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3b0c63bb/d055c44aaab940d68f09a03dfa65f1dc/FLAG4ed25ea94 [2020-07-21 01:47:55,091 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 01:47:55,093 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/nested6.i [2020-07-21 01:47:55,101 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3b0c63bb/d055c44aaab940d68f09a03dfa65f1dc/FLAG4ed25ea94 [2020-07-21 01:47:55,470 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c3b0c63bb/d055c44aaab940d68f09a03dfa65f1dc [2020-07-21 01:47:55,479 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 01:47:55,482 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 01:47:55,483 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 01:47:55,483 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 01:47:55,487 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 01:47:55,489 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,492 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@683975ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55, skipping insertion in model container [2020-07-21 01:47:55,492 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,501 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 01:47:55,519 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 01:47:55,701 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:47:55,706 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 01:47:55,725 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:47:55,739 INFO L208 MainTranslator]: Completed translation [2020-07-21 01:47:55,739 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55 WrapperNode [2020-07-21 01:47:55,739 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 01:47:55,740 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 01:47:55,740 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 01:47:55,740 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 01:47:55,751 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,752 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,757 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,758 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,762 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,769 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,770 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (1/1) ... [2020-07-21 01:47:55,865 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 01:47:55,869 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 01:47:55,869 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 01:47:55,869 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 01:47:55,870 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (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 01:47:55,938 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 01:47:55,938 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 01:47:55,938 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 01:47:55,939 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 01:47:55,939 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 01:47:55,939 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 01:47:55,939 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 01:47:55,939 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 01:47:55,939 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 01:47:55,940 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 01:47:55,940 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 01:47:55,940 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 01:47:55,940 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 01:47:56,222 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 01:47:56,222 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 01:47:56,227 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:47:56 BoogieIcfgContainer [2020-07-21 01:47:56,228 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 01:47:56,229 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 01:47:56,229 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 01:47:56,233 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 01:47:56,233 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:47:55" (1/3) ... [2020-07-21 01:47:56,234 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ac79ee7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:47:56, skipping insertion in model container [2020-07-21 01:47:56,234 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:47:55" (2/3) ... [2020-07-21 01:47:56,235 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ac79ee7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:47:56, skipping insertion in model container [2020-07-21 01:47:56,235 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:47:56" (3/3) ... [2020-07-21 01:47:56,237 INFO L109 eAbstractionObserver]: Analyzing ICFG nested6.i [2020-07-21 01:47:56,261 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 01:47:56,276 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 01:47:56,311 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 01:47:56,350 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 01:47:56,350 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 01:47:56,351 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 01:47:56,351 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 01:47:56,351 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 01:47:56,351 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 01:47:56,351 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 01:47:56,351 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 01:47:56,370 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-07-21 01:47:56,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 01:47:56,377 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:56,379 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:56,379 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:56,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:56,386 INFO L82 PathProgramCache]: Analyzing trace with hash 404168940, now seen corresponding path program 1 times [2020-07-21 01:47:56,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:56,394 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1474786715] [2020-07-21 01:47:56,394 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:47:56,471 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:56,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:56,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 01:47:56,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:56,537 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:47:56,592 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 01:47:56,593 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:47:56,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1474786715] [2020-07-21 01:47:56,595 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:47:56,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 01:47:56,596 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616571762] [2020-07-21 01:47:56,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 01:47:56,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:56,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 01:47:56,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 01:47:56,617 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 5 states. [2020-07-21 01:47:56,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:56,753 INFO L93 Difference]: Finished difference Result 57 states and 80 transitions. [2020-07-21 01:47:56,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 01:47:56,756 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-07-21 01:47:56,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:56,767 INFO L225 Difference]: With dead ends: 57 [2020-07-21 01:47:56,768 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 01:47:56,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 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 01:47:56,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 01:47:56,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 01:47:56,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 01:47:56,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-07-21 01:47:56,828 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 15 [2020-07-21 01:47:56,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:56,829 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-07-21 01:47:56,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 01:47:56,829 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-07-21 01:47:56,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 01:47:56,831 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:56,832 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:57,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:57,047 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:57,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:57,048 INFO L82 PathProgramCache]: Analyzing trace with hash -849304486, now seen corresponding path program 1 times [2020-07-21 01:47:57,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:57,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118125879] [2020-07-21 01:47:57,049 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:47:57,081 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:57,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:57,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 01:47:57,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:57,115 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:47:57,140 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 01:47:57,141 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:47:57,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1118125879] [2020-07-21 01:47:57,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:47:57,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 01:47:57,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870282807] [2020-07-21 01:47:57,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 01:47:57,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:57,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 01:47:57,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 01:47:57,146 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-07-21 01:47:57,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:57,329 INFO L93 Difference]: Finished difference Result 40 states and 47 transitions. [2020-07-21 01:47:57,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 01:47:57,330 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-07-21 01:47:57,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:57,331 INFO L225 Difference]: With dead ends: 40 [2020-07-21 01:47:57,331 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 01:47:57,333 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 01:47:57,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 01:47:57,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2020-07-21 01:47:57,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 01:47:57,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-21 01:47:57,344 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 16 [2020-07-21 01:47:57,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:57,345 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-21 01:47:57,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 01:47:57,345 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-21 01:47:57,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 01:47:57,346 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:57,346 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:57,559 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:57,560 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:57,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:57,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1573212483, now seen corresponding path program 1 times [2020-07-21 01:47:57,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:57,563 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [463191643] [2020-07-21 01:47:57,563 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:47:57,605 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:47:57,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:57,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 01:47:57,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:57,626 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:47:57,642 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:47:57,643 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:47:57,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [463191643] [2020-07-21 01:47:57,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:47:57,644 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 01:47:57,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952766724] [2020-07-21 01:47:57,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 01:47:57,645 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:57,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 01:47:57,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 01:47:57,646 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 5 states. [2020-07-21 01:47:57,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:47:57,713 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2020-07-21 01:47:57,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 01:47:57,713 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-07-21 01:47:57,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:47:57,715 INFO L225 Difference]: With dead ends: 45 [2020-07-21 01:47:57,715 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 01:47:57,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 16 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 01:47:57,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 01:47:57,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-07-21 01:47:57,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-21 01:47:57,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2020-07-21 01:47:57,728 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 20 [2020-07-21 01:47:57,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:47:57,729 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2020-07-21 01:47:57,729 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 01:47:57,729 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2020-07-21 01:47:57,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 01:47:57,731 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:47:57,731 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:47:57,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:57,946 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:47:57,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:47:57,947 INFO L82 PathProgramCache]: Analyzing trace with hash -1604756500, now seen corresponding path program 1 times [2020-07-21 01:47:57,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:47:57,949 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [339009753] [2020-07-21 01:47:57,949 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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) [2020-07-21 01:47:57,991 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:47:57,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:47:57,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 01:47:57,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:47:58,076 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 01:47:58,077 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:47:58,077 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [339009753] [2020-07-21 01:47:58,077 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:47:58,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 01:47:58,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402519355] [2020-07-21 01:47:58,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 01:47:58,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:47:58,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 01:47:58,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 01:47:58,080 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand 5 states. [2020-07-21 01:48:06,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:06,433 INFO L93 Difference]: Finished difference Result 106 states and 136 transitions. [2020-07-21 01:48:06,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 01:48:06,438 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-07-21 01:48:06,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:06,443 INFO L225 Difference]: With dead ends: 106 [2020-07-21 01:48:06,443 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 01:48:06,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-07-21 01:48:06,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 01:48:06,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 47. [2020-07-21 01:48:06,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-21 01:48:06,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2020-07-21 01:48:06,474 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 24 [2020-07-21 01:48:06,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:06,475 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2020-07-21 01:48:06,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 01:48:06,475 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2020-07-21 01:48:06,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 01:48:06,478 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:06,479 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:06,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:06,680 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:06,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:06,681 INFO L82 PathProgramCache]: Analyzing trace with hash -1598241856, now seen corresponding path program 1 times [2020-07-21 01:48:06,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:06,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1665412735] [2020-07-21 01:48:06,683 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:48:06,715 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:48:06,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:06,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 01:48:06,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:06,756 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 01:48:06,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:06,802 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 01:48:06,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1665412735] [2020-07-21 01:48:06,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:06,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2020-07-21 01:48:06,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907856185] [2020-07-21 01:48:06,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 01:48:06,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:06,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 01:48:06,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 01:48:06,805 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand 6 states. [2020-07-21 01:48:06,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:06,934 INFO L93 Difference]: Finished difference Result 82 states and 97 transitions. [2020-07-21 01:48:06,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 01:48:06,935 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 31 [2020-07-21 01:48:06,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:06,937 INFO L225 Difference]: With dead ends: 82 [2020-07-21 01:48:06,937 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 01:48:06,938 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 54 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2020-07-21 01:48:06,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 01:48:06,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 53. [2020-07-21 01:48:06,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 01:48:06,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2020-07-21 01:48:06,972 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 31 [2020-07-21 01:48:06,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:06,973 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2020-07-21 01:48:06,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 01:48:06,973 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2020-07-21 01:48:06,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 01:48:06,980 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:06,980 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:07,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:07,181 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:07,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:07,182 INFO L82 PathProgramCache]: Analyzing trace with hash 2099424040, now seen corresponding path program 1 times [2020-07-21 01:48:07,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:07,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1773499974] [2020-07-21 01:48:07,182 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:48:07,239 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:48:07,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:07,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 01:48:07,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:07,351 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 01:48:07,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:48:07,456 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 01:48:07,457 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1773499974] [2020-07-21 01:48:07,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:48:07,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2020-07-21 01:48:07,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753652067] [2020-07-21 01:48:07,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 01:48:07,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:07,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 01:48:07,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-07-21 01:48:07,459 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand 13 states. [2020-07-21 01:48:07,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:07,836 INFO L93 Difference]: Finished difference Result 120 states and 156 transitions. [2020-07-21 01:48:07,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 01:48:07,837 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-07-21 01:48:07,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:07,838 INFO L225 Difference]: With dead ends: 120 [2020-07-21 01:48:07,839 INFO L226 Difference]: Without dead ends: 86 [2020-07-21 01:48:07,841 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=227, Unknown=0, NotChecked=0, Total=306 [2020-07-21 01:48:07,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-21 01:48:07,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 56. [2020-07-21 01:48:07,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 01:48:07,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 67 transitions. [2020-07-21 01:48:07,863 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 67 transitions. Word has length 34 [2020-07-21 01:48:07,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:07,864 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 67 transitions. [2020-07-21 01:48:07,864 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 01:48:07,864 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 67 transitions. [2020-07-21 01:48:07,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-21 01:48:07,866 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:07,866 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:08,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:08,078 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:08,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:08,078 INFO L82 PathProgramCache]: Analyzing trace with hash -1702845076, now seen corresponding path program 2 times [2020-07-21 01:48:08,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:08,080 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2124198862] [2020-07-21 01:48:08,080 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:48:08,120 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:48:08,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:08,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 01:48:08,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:08,145 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 01:48:08,167 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 01:48:08,167 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:48:08,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2124198862] [2020-07-21 01:48:08,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:48:08,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 01:48:08,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957475915] [2020-07-21 01:48:08,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 01:48:08,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:08,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 01:48:08,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-07-21 01:48:08,170 INFO L87 Difference]: Start difference. First operand 56 states and 67 transitions. Second operand 6 states. [2020-07-21 01:48:08,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:08,286 INFO L93 Difference]: Finished difference Result 71 states and 85 transitions. [2020-07-21 01:48:08,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 01:48:08,287 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 38 [2020-07-21 01:48:08,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:08,289 INFO L225 Difference]: With dead ends: 71 [2020-07-21 01:48:08,289 INFO L226 Difference]: Without dead ends: 69 [2020-07-21 01:48:08,289 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-21 01:48:08,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-07-21 01:48:08,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 58. [2020-07-21 01:48:08,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-21 01:48:08,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 69 transitions. [2020-07-21 01:48:08,302 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 69 transitions. Word has length 38 [2020-07-21 01:48:08,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:08,302 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 69 transitions. [2020-07-21 01:48:08,302 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 01:48:08,302 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 69 transitions. [2020-07-21 01:48:08,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 01:48:08,304 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:48:08,304 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:48:08,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:08,518 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:48:08,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:48:08,519 INFO L82 PathProgramCache]: Analyzing trace with hash -1550723981, now seen corresponding path program 1 times [2020-07-21 01:48:08,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:48:08,520 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [640141193] [2020-07-21 01:48:08,521 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 01:48:08,548 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:48:08,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:48:08,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:48:08,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:48:08,579 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-21 01:48:08,579 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:48:08,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [640141193] [2020-07-21 01:48:08,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:48:08,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 01:48:08,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276562975] [2020-07-21 01:48:08,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 01:48:08,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:48:08,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 01:48:08,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 01:48:08,583 INFO L87 Difference]: Start difference. First operand 58 states and 69 transitions. Second operand 4 states. [2020-07-21 01:48:08,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:48:08,656 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2020-07-21 01:48:08,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 01:48:08,658 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 40 [2020-07-21 01:48:08,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:48:08,659 INFO L225 Difference]: With dead ends: 86 [2020-07-21 01:48:08,659 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 01:48:08,665 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 01:48:08,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 01:48:08,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 01:48:08,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 01:48:08,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 01:48:08,666 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 40 [2020-07-21 01:48:08,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:48:08,667 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 01:48:08,667 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 01:48:08,667 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 01:48:08,667 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 01:48:08,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:48:08,882 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 01:48:09,472 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 01:48:09,472 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 01:48:09,473 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 01:48:09,473 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 01:48:09,473 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 01:48:09,473 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 01:48:09,473 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-07-21 01:48:09,473 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-07-21 01:48:09,473 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-07-21 01:48:09,473 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-07-21 01:48:09,473 INFO L268 CegarLoopResult]: For program point L31(lines 23 33) no Hoare annotation was computed. [2020-07-21 01:48:09,473 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 37) no Hoare annotation was computed. [2020-07-21 01:48:09,474 INFO L264 CegarLoopResult]: At program point L23-2(lines 23 33) the Hoare annotation is: (let ((.cse2 (* 2 main_~i~0))) (let ((.cse0 (<= main_~n~0 main_~k~0)) (.cse1 (<= .cse2 main_~j~0))) (or (and (<= main_~k~0 main_~n~0) .cse0 .cse1) (and (<= main_~i~0 0) (<= main_~k~0 (+ .cse2 1)) (<= main_~k~0 main_~j~0) .cse0 .cse1)))) [2020-07-21 01:48:09,474 INFO L268 CegarLoopResult]: For program point L24(lines 24 32) no Hoare annotation was computed. [2020-07-21 01:48:09,474 INFO L264 CegarLoopResult]: At program point L25-2(lines 25 27) the Hoare annotation is: (let ((.cse0 (* 2 main_~i~0))) (and (< main_~j~0 main_~n~0) (<= .cse0 main_~k~0) (<= main_~k~0 main_~n~0) (<= .cse0 main_~j~0))) [2020-07-21 01:48:09,474 INFO L268 CegarLoopResult]: For program point L17(line 17) no Hoare annotation was computed. [2020-07-21 01:48:09,474 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 37) no Hoare annotation was computed. [2020-07-21 01:48:09,474 INFO L264 CegarLoopResult]: At program point L30(line 30) the Hoare annotation is: (and (< main_~j~0 main_~n~0) (<= main_~k~0 main_~n~0) (<= main_~n~0 main_~k~0) (<= (* 2 main_~i~0) main_~j~0)) [2020-07-21 01:48:09,474 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 37) the Hoare annotation is: true [2020-07-21 01:48:09,475 INFO L264 CegarLoopResult]: At program point L30-1(line 30) the Hoare annotation is: (and (< main_~j~0 main_~n~0) (<= main_~k~0 main_~n~0) (<= main_~n~0 main_~k~0) (<= (* 2 main_~i~0) main_~j~0)) [2020-07-21 01:48:09,475 INFO L264 CegarLoopResult]: At program point L26(line 26) the Hoare annotation is: (let ((.cse0 (* 2 main_~i~0))) (and (< main_~j~0 main_~n~0) (<= (+ main_~k~0 1) main_~n~0) (<= .cse0 main_~k~0) (<= .cse0 main_~j~0))) [2020-07-21 01:48:09,475 INFO L268 CegarLoopResult]: For program point L26-1(lines 25 27) no Hoare annotation was computed. [2020-07-21 01:48:09,475 INFO L268 CegarLoopResult]: For program point L22-2(lines 22 34) no Hoare annotation was computed. [2020-07-21 01:48:09,475 INFO L264 CegarLoopResult]: At program point L22-3(lines 22 34) the Hoare annotation is: (let ((.cse0 (<= main_~k~0 main_~n~0)) (.cse1 (<= main_~n~0 main_~k~0)) (.cse3 (<= main_~n~0 main_~j~0))) (or (and (<= main_~i~0 0) .cse0 .cse1) (let ((.cse2 (div (+ (* main_~n~0 (- 1)) 1) (- 2)))) (and (<= .cse2 0) (< main_~k~0 (+ main_~i~0 1)) (<= (+ .cse2 1) main_~i~0) .cse1 .cse3)) (and .cse0 .cse1 .cse3))) [2020-07-21 01:48:09,476 INFO L268 CegarLoopResult]: For program point L18(lines 18 21) no Hoare annotation was computed. [2020-07-21 01:48:09,476 INFO L268 CegarLoopResult]: For program point L18-1(lines 18 21) no Hoare annotation was computed. [2020-07-21 01:48:09,476 INFO L271 CegarLoopResult]: At program point L35(lines 13 37) the Hoare annotation is: true [2020-07-21 01:48:09,476 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-07-21 01:48:09,476 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-07-21 01:48:09,476 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-07-21 01:48:09,476 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-07-21 01:48:09,477 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-07-21 01:48:09,477 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-07-21 01:48:09,496 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:48:09 BoogieIcfgContainer [2020-07-21 01:48:09,496 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 01:48:09,499 INFO L168 Benchmark]: Toolchain (without parser) took 14017.16 ms. Allocated memory was 142.1 MB in the beginning and 243.3 MB in the end (delta: 101.2 MB). Free memory was 104.2 MB in the beginning and 128.2 MB in the end (delta: -24.0 MB). Peak memory consumption was 77.2 MB. Max. memory is 7.1 GB. [2020-07-21 01:48:09,500 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 142.1 MB. Free memory was 122.7 MB in the beginning and 122.5 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 01:48:09,501 INFO L168 Benchmark]: CACSL2BoogieTranslator took 256.78 ms. Allocated memory is still 142.1 MB. Free memory was 103.8 MB in the beginning and 94.2 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-21 01:48:09,502 INFO L168 Benchmark]: Boogie Preprocessor took 128.35 ms. Allocated memory was 142.1 MB in the beginning and 204.5 MB in the end (delta: 62.4 MB). Free memory was 94.2 MB in the beginning and 183.6 MB in the end (delta: -89.4 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. [2020-07-21 01:48:09,503 INFO L168 Benchmark]: RCFGBuilder took 358.90 ms. Allocated memory is still 204.5 MB. Free memory was 183.6 MB in the beginning and 168.5 MB in the end (delta: 15.0 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. [2020-07-21 01:48:09,504 INFO L168 Benchmark]: TraceAbstraction took 13267.27 ms. Allocated memory was 204.5 MB in the beginning and 243.3 MB in the end (delta: 38.8 MB). Free memory was 167.9 MB in the beginning and 128.2 MB in the end (delta: 39.7 MB). Peak memory consumption was 78.5 MB. Max. memory is 7.1 GB. [2020-07-21 01:48:09,508 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 142.1 MB. Free memory was 122.7 MB in the beginning and 122.5 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 256.78 ms. Allocated memory is still 142.1 MB. Free memory was 103.8 MB in the beginning and 94.2 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 128.35 ms. Allocated memory was 142.1 MB in the beginning and 204.5 MB in the end (delta: 62.4 MB). Free memory was 94.2 MB in the beginning and 183.6 MB in the end (delta: -89.4 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 358.90 ms. Allocated memory is still 204.5 MB. Free memory was 183.6 MB in the beginning and 168.5 MB in the end (delta: 15.0 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 13267.27 ms. Allocated memory was 204.5 MB in the beginning and 243.3 MB in the end (delta: 38.8 MB). Free memory was 167.9 MB in the beginning and 128.2 MB in the end (delta: 39.7 MB). Peak memory consumption was 78.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: ((j < n && 2 * i <= k) && k <= n) && 2 * i <= j - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 22]: Loop Invariant Derived loop invariant: (((i <= 0 && k <= n) && n <= k) || (((((n * -1 + 1) / -2 <= 0 && k < i + 1) && (n * -1 + 1) / -2 + 1 <= i) && n <= k) && n <= j)) || ((k <= n && n <= k) && n <= j) - InvariantResult [Line: 23]: Loop Invariant Derived loop invariant: ((k <= n && n <= k) && 2 * i <= j) || ((((i <= 0 && k <= 2 * i + 1) && k <= j) && n <= k) && 2 * i <= j) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 12.5s, OverallIterations: 8, TraceHistogramMax: 4, AutomataDifference: 9.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.5s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 217 SDtfs, 120 SDslu, 558 SDs, 0 SdLazy, 425 SolverSat, 67 SolverUnsat, 4 SolverUnknown, 0 SolverNotchecked, 8.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 290 GetRequests, 237 SyntacticMatches, 4 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=58occurred in iteration=7, 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, 8 MinimizatonAttempts, 76 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 12 LocationsWithAnnotation, 37 PreInvPairs, 56 NumberOfFragments, 160 HoareAnnotationTreeSize, 37 FomulaSimplifications, 3079 FormulaSimplificationTreeSizeReduction, 0.2s HoareSimplificationTime, 12 FomulaSimplificationsInter, 298 FormulaSimplificationTreeSizeReductionInter, 0.3s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.6s InterpolantComputationTime, 218 NumberOfCodeBlocks, 182 NumberOfCodeBlocksAsserted, 27 NumberOfCheckSat, 273 ConstructedInterpolants, 1 QuantifiedInterpolants, 16841 SizeOfPredicates, 25 NumberOfNonLiveVariables, 437 ConjunctsInSsa, 38 ConjunctsInUnsatCore, 10 InterpolantComputations, 6 PerfectInterpolantSequences, 104/112 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...