/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/array-fpi/brs3f.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 23:08:33,915 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 23:08:33,918 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 23:08:33,930 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 23:08:33,930 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 23:08:33,931 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 23:08:33,933 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 23:08:33,934 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 23:08:33,936 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 23:08:33,937 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 23:08:33,938 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 23:08:33,939 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 23:08:33,939 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 23:08:33,940 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 23:08:33,941 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 23:08:33,942 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 23:08:33,943 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 23:08:33,944 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 23:08:33,945 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 23:08:33,947 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 23:08:33,948 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 23:08:33,949 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 23:08:33,950 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 23:08:33,951 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 23:08:33,953 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 23:08:33,960 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 23:08:33,961 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 23:08:33,962 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 23:08:33,962 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 23:08:33,976 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 23:08:33,976 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 23:08:33,977 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 23:08:33,978 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 23:08:33,978 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 23:08:33,978 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 23:08:33,978 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 23:08:33,979 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 23:08:33,979 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 23:08:33,979 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 23:08:33,979 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 23:08:33,979 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 23:08:33,980 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 23:08:33,980 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 23:08:33,980 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 23:08:33,980 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 23:08:33,980 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 23:08:33,981 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 23:08:33,981 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 23:08:33,981 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 23:08:33,981 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 23:08:33,981 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:08:33,982 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 23:08:33,982 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 23:08:33,982 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 23:08:33,982 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 23:08:33,982 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:08:33,983 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 23:08:33,983 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 23:08:33,983 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 23:08:34,294 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 23:08:34,307 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 23:08:34,310 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 23:08:34,311 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 23:08:34,312 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 23:08:34,312 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-fpi/brs3f.c [2020-07-21 23:08:34,379 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9d5afb5c6/2310e2ef55ef4cdd889d47d0f73875e3/FLAG540bc2f1d [2020-07-21 23:08:34,818 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 23:08:34,819 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-fpi/brs3f.c [2020-07-21 23:08:34,826 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9d5afb5c6/2310e2ef55ef4cdd889d47d0f73875e3/FLAG540bc2f1d [2020-07-21 23:08:35,202 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9d5afb5c6/2310e2ef55ef4cdd889d47d0f73875e3 [2020-07-21 23:08:35,215 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 23:08:35,219 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 23:08:35,220 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 23:08:35,220 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 23:08:35,223 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 23:08:35,225 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:08:35" (1/1) ... [2020-07-21 23:08:35,228 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18c0d61b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:35, skipping insertion in model container [2020-07-21 23:08:35,228 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:08:35" (1/1) ... [2020-07-21 23:08:35,236 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 23:08:35,260 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 23:08:35,517 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:08:35,528 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 23:08:35,566 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:08:35,586 INFO L208 MainTranslator]: Completed translation [2020-07-21 23:08:35,587 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:35 WrapperNode [2020-07-21 23:08:35,587 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 23:08:35,588 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 23:08:35,588 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 23:08:35,588 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 23:08:35,678 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:35" (1/1) ... [2020-07-21 23:08:35,679 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:35" (1/1) ... [2020-07-21 23:08:35,686 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:35" (1/1) ... [2020-07-21 23:08:35,687 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:35" (1/1) ... [2020-07-21 23:08:35,694 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:35" (1/1) ... [2020-07-21 23:08:35,700 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:35" (1/1) ... [2020-07-21 23:08:35,702 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:35" (1/1) ... [2020-07-21 23:08:35,704 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 23:08:35,705 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 23:08:35,705 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 23:08:35,705 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 23:08:35,706 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:35" (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 23:08:35,775 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 23:08:35,775 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 23:08:35,775 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 23:08:35,775 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 23:08:35,775 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 23:08:35,776 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 23:08:35,776 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 23:08:35,776 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 23:08:35,776 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 23:08:35,776 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 23:08:35,776 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-21 23:08:35,777 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 23:08:35,777 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 23:08:35,777 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-21 23:08:35,777 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 23:08:35,777 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 23:08:35,777 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 23:08:35,778 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 23:08:35,778 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 23:08:36,095 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 23:08:36,095 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-21 23:08:36,100 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:08:36 BoogieIcfgContainer [2020-07-21 23:08:36,100 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 23:08:36,101 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 23:08:36,101 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 23:08:36,105 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 23:08:36,106 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:08:35" (1/3) ... [2020-07-21 23:08:36,107 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e015947 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:08:36, skipping insertion in model container [2020-07-21 23:08:36,107 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:08:35" (2/3) ... [2020-07-21 23:08:36,107 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e015947 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:08:36, skipping insertion in model container [2020-07-21 23:08:36,108 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:08:36" (3/3) ... [2020-07-21 23:08:36,110 INFO L109 eAbstractionObserver]: Analyzing ICFG brs3f.c [2020-07-21 23:08:36,121 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 23:08:36,131 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 23:08:36,153 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 23:08:36,184 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 23:08:36,184 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 23:08:36,184 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 23:08:36,184 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 23:08:36,185 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 23:08:36,185 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 23:08:36,185 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 23:08:36,185 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 23:08:36,207 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 23:08:36,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 23:08:36,212 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:08:36,212 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:08:36,213 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:08:36,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:08:36,218 INFO L82 PathProgramCache]: Analyzing trace with hash 1824292310, now seen corresponding path program 1 times [2020-07-21 23:08:36,224 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:08:36,225 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1530534079] [2020-07-21 23:08:36,225 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 23:08:36,324 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:08:36,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:08:36,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 23:08:36,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:08:36,353 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 23:08:36,353 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:08:36,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1530534079] [2020-07-21 23:08:36,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:08:36,355 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 23:08:36,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490180457] [2020-07-21 23:08:36,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 23:08:36,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:08:36,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 23:08:36,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 23:08:36,376 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 2 states. [2020-07-21 23:08:36,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:08:36,397 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2020-07-21 23:08:36,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 23:08:36,398 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 21 [2020-07-21 23:08:36,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:08:36,406 INFO L225 Difference]: With dead ends: 56 [2020-07-21 23:08:36,406 INFO L226 Difference]: Without dead ends: 26 [2020-07-21 23:08:36,410 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 23:08:36,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-21 23:08:36,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-07-21 23:08:36,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 23:08:36,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2020-07-21 23:08:36,450 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 21 [2020-07-21 23:08:36,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:08:36,450 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2020-07-21 23:08:36,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 23:08:36,451 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2020-07-21 23:08:36,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 23:08:36,452 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:08:36,452 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:08:36,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:08:36,654 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:08:36,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:08:36,655 INFO L82 PathProgramCache]: Analyzing trace with hash 1767537087, now seen corresponding path program 1 times [2020-07-21 23:08:36,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:08:36,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [453763038] [2020-07-21 23:08:36,657 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 23:08:36,718 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:08:36,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:08:36,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 23:08:36,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:08:36,783 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 23:08:36,783 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:08:36,784 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [453763038] [2020-07-21 23:08:36,784 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:08:36,785 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 23:08:36,785 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933755086] [2020-07-21 23:08:36,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 23:08:36,788 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:08:36,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 23:08:36,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:08:36,789 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 4 states. [2020-07-21 23:08:36,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:08:36,885 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-07-21 23:08:36,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 23:08:36,886 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 21 [2020-07-21 23:08:36,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:08:36,888 INFO L225 Difference]: With dead ends: 42 [2020-07-21 23:08:36,888 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 23:08:36,889 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 23:08:36,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 23:08:36,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 28. [2020-07-21 23:08:36,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 23:08:36,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-07-21 23:08:36,898 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 21 [2020-07-21 23:08:36,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:08:36,898 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-07-21 23:08:36,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 23:08:36,899 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-07-21 23:08:36,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 23:08:36,900 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:08:36,900 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 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 23:08:37,109 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:08:37,111 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:08:37,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:08:37,112 INFO L82 PathProgramCache]: Analyzing trace with hash -395878216, now seen corresponding path program 1 times [2020-07-21 23:08:37,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:08:37,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [195902116] [2020-07-21 23:08:37,114 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 23:08:37,180 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:08:37,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:08:37,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 23:08:37,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:08:37,265 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2020-07-21 23:08:37,267 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-21 23:08:37,282 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-21 23:08:37,282 INFO L544 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-21 23:08:37,283 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2020-07-21 23:08:37,310 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2020-07-21 23:08:37,311 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-21 23:08:37,316 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-21 23:08:37,317 INFO L544 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-21 23:08:37,317 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:18, output treesize:7 [2020-07-21 23:08:37,331 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:08:37,336 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 23:08:37,363 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 23:08:37,364 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:08:37,364 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [195902116] [2020-07-21 23:08:37,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:08:37,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-21 23:08:37,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023139675] [2020-07-21 23:08:37,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 23:08:37,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:08:37,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 23:08:37,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-21 23:08:37,367 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 7 states. [2020-07-21 23:08:37,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:08:37,500 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2020-07-21 23:08:37,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 23:08:37,501 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 27 [2020-07-21 23:08:37,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:08:37,502 INFO L225 Difference]: With dead ends: 37 [2020-07-21 23:08:37,503 INFO L226 Difference]: Without dead ends: 31 [2020-07-21 23:08:37,503 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-07-21 23:08:37,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-21 23:08:37,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2020-07-21 23:08:37,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 23:08:37,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-07-21 23:08:37,510 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 27 [2020-07-21 23:08:37,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:08:37,510 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-07-21 23:08:37,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 23:08:37,511 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-07-21 23:08:37,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 23:08:37,512 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:08:37,512 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 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 23:08:37,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:08:37,728 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:08:37,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:08:37,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1205224842, now seen corresponding path program 1 times [2020-07-21 23:08:37,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:08:37,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1915962174] [2020-07-21 23:08:37,730 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) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:08:37,783 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:08:37,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:08:37,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 23:08:37,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:08:37,798 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 23:08:37,799 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:08:37,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1915962174] [2020-07-21 23:08:37,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:08:37,800 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:08:37,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676200370] [2020-07-21 23:08:37,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:08:37,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:08:37,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:08:37,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:08:37,801 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 3 states. [2020-07-21 23:08:37,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:08:37,851 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-07-21 23:08:37,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:08:37,854 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 23:08:37,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:08:37,855 INFO L225 Difference]: With dead ends: 48 [2020-07-21 23:08:37,855 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 23:08:37,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:08:37,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 23:08:37,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2020-07-21 23:08:37,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 23:08:37,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-21 23:08:37,863 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 27 [2020-07-21 23:08:37,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:08:37,863 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-21 23:08:37,863 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:08:37,863 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-21 23:08:37,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-21 23:08:37,864 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:08:37,865 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, 1, 1, 1, 1, 1, 1] [2020-07-21 23:08:38,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:08:38,080 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:08:38,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:08:38,081 INFO L82 PathProgramCache]: Analyzing trace with hash 1239476407, now seen corresponding path program 1 times [2020-07-21 23:08:38,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:08:38,082 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182265928] [2020-07-21 23:08:38,083 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 23:08:38,130 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:08:38,130 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:08:38,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 23:08:38,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:08:38,188 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:08:38,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:08:38,242 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:08:38,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182265928] [2020-07-21 23:08:38,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:08:38,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 23:08:38,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361484155] [2020-07-21 23:08:38,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 23:08:38,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:08:38,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 23:08:38,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 23:08:38,246 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 9 states. [2020-07-21 23:08:38,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:08:38,389 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2020-07-21 23:08:38,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 23:08:38,389 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 30 [2020-07-21 23:08:38,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:08:38,390 INFO L225 Difference]: With dead ends: 54 [2020-07-21 23:08:38,390 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 23:08:38,391 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 49 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-07-21 23:08:38,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 23:08:38,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 35. [2020-07-21 23:08:38,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 23:08:38,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-21 23:08:38,398 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 30 [2020-07-21 23:08:38,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:08:38,399 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-21 23:08:38,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 23:08:38,399 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-21 23:08:38,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-21 23:08:38,400 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:08:38,400 INFO L422 BasicCegarLoop]: trace histogram [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, 1, 1] [2020-07-21 23:08:38,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:08:38,614 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:08:38,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:08:38,616 INFO L82 PathProgramCache]: Analyzing trace with hash 1492634651, now seen corresponding path program 1 times [2020-07-21 23:08:38,616 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:08:38,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1224920429] [2020-07-21 23:08:38,616 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 23:08:38,666 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:08:38,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 23:08:38,666 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 23:08:38,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 23:08:38,684 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 23:08:38,709 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 23:08:38,710 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 23:08:38,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:08:38,983 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 11:08:38 BoogieIcfgContainer [2020-07-21 23:08:38,983 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 23:08:38,991 INFO L168 Benchmark]: Toolchain (without parser) took 3772.50 ms. Allocated memory was 136.3 MB in the beginning and 227.5 MB in the end (delta: 91.2 MB). Free memory was 101.4 MB in the beginning and 119.9 MB in the end (delta: -18.5 MB). Peak memory consumption was 72.7 MB. Max. memory is 7.1 GB. [2020-07-21 23:08:38,992 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 136.3 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 23:08:38,993 INFO L168 Benchmark]: CACSL2BoogieTranslator took 367.71 ms. Allocated memory is still 136.3 MB. Free memory was 101.0 MB in the beginning and 90.7 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-07-21 23:08:38,994 INFO L168 Benchmark]: Boogie Preprocessor took 116.63 ms. Allocated memory was 136.3 MB in the beginning and 197.7 MB in the end (delta: 61.3 MB). Free memory was 90.7 MB in the beginning and 175.4 MB in the end (delta: -84.7 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-21 23:08:38,995 INFO L168 Benchmark]: RCFGBuilder took 395.27 ms. Allocated memory is still 197.7 MB. Free memory was 175.4 MB in the beginning and 158.6 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 7.1 GB. [2020-07-21 23:08:38,997 INFO L168 Benchmark]: TraceAbstraction took 2881.90 ms. Allocated memory was 197.7 MB in the beginning and 227.5 MB in the end (delta: 29.9 MB). Free memory was 157.9 MB in the beginning and 119.9 MB in the end (delta: 38.0 MB). Peak memory consumption was 67.9 MB. Max. memory is 7.1 GB. [2020-07-21 23:08:39,002 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 136.3 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 367.71 ms. Allocated memory is still 136.3 MB. Free memory was 101.0 MB in the beginning and 90.7 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 116.63 ms. Allocated memory was 136.3 MB in the beginning and 197.7 MB in the end (delta: 61.3 MB). Free memory was 90.7 MB in the beginning and 175.4 MB in the end (delta: -84.7 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 395.27 ms. Allocated memory is still 197.7 MB. Free memory was 175.4 MB in the beginning and 158.6 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2881.90 ms. Allocated memory was 197.7 MB in the beginning and 227.5 MB in the end (delta: 29.9 MB). Free memory was 157.9 MB in the beginning and 119.9 MB in the end (delta: 38.0 MB). Peak memory consumption was 67.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L17] int N; VAL [\old(N)=7, N=0] [L21] N = __VERIFIER_nondet_int() [L22] COND FALSE !(N <= 0) VAL [\old(N)=0, N=2] [L23] CALL assume_abort_if_not(N <= 2147483647/sizeof(int)) VAL [\old(cond)=1, \old(N)=0, N=2] [L11] COND FALSE !(!cond) VAL [\old(cond)=1, \old(N)=0, cond=1, N=2] [L23] RET assume_abort_if_not(N <= 2147483647/sizeof(int)) VAL [\old(N)=0, N=2] [L25] int i; [L26] long long sum[1]; [L27] int *a = malloc(sizeof(int)*N); [L29] i=0 VAL [\old(N)=0, a={-1:0}, i=0, malloc(sizeof(int)*N)={-1:0}, N=2, sum={2:0}] [L29] COND TRUE i