/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-fpi/s2iff.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:47:14,906 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:47:14,909 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:47:14,929 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:47:14,929 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:47:14,931 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:47:14,933 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:47:14,946 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:47:14,948 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:47:14,950 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:47:14,951 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:47:14,953 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:47:14,954 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:47:14,956 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:47:14,958 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:47:14,960 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:47:14,962 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:47:14,963 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:47:14,966 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:47:14,969 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:47:14,970 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:47:14,971 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:47:14,972 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:47:14,973 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:47:14,975 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:47:14,983 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:47:14,983 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:47:14,984 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:47:14,985 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 [2020-07-20 11:47:14,999 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:47:14,999 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:47:15,000 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:47:15,000 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:47:15,001 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:47:15,001 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:47:15,001 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:47:15,001 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:47:15,001 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:47:15,002 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:47:15,002 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:47:15,002 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:47:15,002 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:47:15,002 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:47:15,003 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:47:15,003 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:47:15,003 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:47:15,003 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:47:15,003 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:47:15,004 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:47:15,004 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:47:15,004 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:47:15,004 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:47:15,004 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:47:15,004 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:47:15,005 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:47:15,005 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:15,005 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:47:15,005 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:47:15,005 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 11:47:15,296 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:47:15,316 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:47:15,319 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:47:15,320 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:47:15,321 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:47:15,322 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-fpi/s2iff.c [2020-07-20 11:47:15,390 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8e839d2d0/4adf787b1c9943368081668be4086690/FLAG13eb6d557 [2020-07-20 11:47:15,860 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:47:15,860 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-fpi/s2iff.c [2020-07-20 11:47:15,867 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8e839d2d0/4adf787b1c9943368081668be4086690/FLAG13eb6d557 [2020-07-20 11:47:16,288 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8e839d2d0/4adf787b1c9943368081668be4086690 [2020-07-20 11:47:16,296 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:47:16,298 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:47:16,299 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:47:16,299 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:47:16,302 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:47:16,303 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:47:16" (1/1) ... [2020-07-20 11:47:16,306 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ac620e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:16, skipping insertion in model container [2020-07-20 11:47:16,306 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:47:16" (1/1) ... [2020-07-20 11:47:16,313 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:47:16,332 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:47:16,510 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:47:16,518 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:47:16,540 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:47:16,556 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:47:16,557 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:16 WrapperNode [2020-07-20 11:47:16,557 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:47:16,558 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:47:16,558 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:47:16,558 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:47:16,660 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:16" (1/1) ... [2020-07-20 11:47:16,660 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:16" (1/1) ... [2020-07-20 11:47:16,676 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:16" (1/1) ... [2020-07-20 11:47:16,676 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:16" (1/1) ... [2020-07-20 11:47:16,685 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:16" (1/1) ... [2020-07-20 11:47:16,690 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:16" (1/1) ... [2020-07-20 11:47:16,692 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:16" (1/1) ... [2020-07-20 11:47:16,694 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:47:16,695 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:47:16,695 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:47:16,695 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:47:16,696 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:16" (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 [2020-07-20 11:47:16,761 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:47:16,761 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:47:16,762 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 11:47:16,762 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 11:47:16,762 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:47:16,762 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:47:16,762 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 11:47:16,762 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 11:47:16,763 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 11:47:16,763 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:47:16,763 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-20 11:47:16,763 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:47:16,764 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 11:47:16,764 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-20 11:47:16,764 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 11:47:16,765 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 11:47:16,765 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 11:47:16,765 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:47:16,765 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:47:17,100 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:47:17,100 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-20 11:47:17,104 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:47:17 BoogieIcfgContainer [2020-07-20 11:47:17,104 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:47:17,106 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:47:17,106 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:47:17,109 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:47:17,109 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:47:16" (1/3) ... [2020-07-20 11:47:17,110 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12c03405 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:47:17, skipping insertion in model container [2020-07-20 11:47:17,110 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:16" (2/3) ... [2020-07-20 11:47:17,110 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12c03405 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:47:17, skipping insertion in model container [2020-07-20 11:47:17,111 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:47:17" (3/3) ... [2020-07-20 11:47:17,112 INFO L109 eAbstractionObserver]: Analyzing ICFG s2iff.c [2020-07-20 11:47:17,123 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:47:17,129 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:47:17,143 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:47:17,167 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:47:17,167 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:47:17,167 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:47:17,168 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:47:17,168 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:47:17,168 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:47:17,168 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:47:17,168 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:47:17,185 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2020-07-20 11:47:17,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 11:47:17,190 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:47:17,191 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] [2020-07-20 11:47:17,192 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:47:17,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:47:17,197 INFO L82 PathProgramCache]: Analyzing trace with hash -432131487, now seen corresponding path program 1 times [2020-07-20 11:47:17,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:47:17,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1715634496] [2020-07-20 11:47:17,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:17,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:47:17,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 11:47:17,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:47:17,315 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:47:17,315 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:47:17,316 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1715634496] [2020-07-20 11:47:17,317 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:47:17,317 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 11:47:17,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73589333] [2020-07-20 11:47:17,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 11:47:17,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:47:17,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 11:47:17,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:47:17,347 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 2 states. [2020-07-20 11:47:17,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:47:17,372 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-07-20 11:47:17,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 11:47:17,373 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 21 [2020-07-20 11:47:17,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:47:17,382 INFO L225 Difference]: With dead ends: 54 [2020-07-20 11:47:17,383 INFO L226 Difference]: Without dead ends: 25 [2020-07-20 11:47:17,386 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 [2020-07-20 11:47:17,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-20 11:47:17,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-07-20 11:47:17,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-20 11:47:17,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-07-20 11:47:17,426 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 21 [2020-07-20 11:47:17,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:47:17,427 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-07-20 11:47:17,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 11:47:17,428 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-07-20 11:47:17,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 11:47:17,429 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:47:17,429 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] [2020-07-20 11:47:17,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:17,630 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:47:17,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:47:17,631 INFO L82 PathProgramCache]: Analyzing trace with hash -173966049, now seen corresponding path program 1 times [2020-07-20 11:47:17,632 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:47:17,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [974613494] [2020-07-20 11:47:17,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:17,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:47:17,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:47:17,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:47:17,747 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:47:17,747 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:47:17,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [974613494] [2020-07-20 11:47:17,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:47:17,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 11:47:17,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755206165] [2020-07-20 11:47:17,751 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 11:47:17,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:47:17,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 11:47:17,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 11:47:17,753 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 4 states. [2020-07-20 11:47:17,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:47:17,843 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-20 11:47:17,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 11:47:17,844 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 21 [2020-07-20 11:47:17,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:47:17,846 INFO L225 Difference]: With dead ends: 40 [2020-07-20 11:47:17,846 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 11:47:17,847 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 [2020-07-20 11:47:17,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 11:47:17,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2020-07-20 11:47:17,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 11:47:17,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-07-20 11:47:17,861 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 21 [2020-07-20 11:47:17,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:47:17,862 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-07-20 11:47:17,863 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 11:47:17,863 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-07-20 11:47:17,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 11:47:17,865 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:47:17,865 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] [2020-07-20 11:47:18,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:18,072 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:47:18,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:47:18,073 INFO L82 PathProgramCache]: Analyzing trace with hash -445719797, now seen corresponding path program 1 times [2020-07-20 11:47:18,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:47:18,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [15807631] [2020-07-20 11:47:18,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:18,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:47:18,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 11:47:18,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:47:18,205 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 [2020-07-20 11:47:18,205 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-20 11:47:18,225 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:47:18,226 INFO L544 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-20 11:47:18,226 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:19 [2020-07-20 11:47:18,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-07-20 11:47:18,259 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2020-07-20 11:47:18,260 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-20 11:47:18,274 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:47:18,274 INFO L544 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-20 11:47:18,275 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:34, output treesize:30 [2020-07-20 11:47:18,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-07-20 11:47:18,450 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:47:18,451 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 57 [2020-07-20 11:47:18,458 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-20 11:47:18,507 INFO L624 ElimStorePlain]: treesize reduction 30, result has 63.4 percent of original size [2020-07-20 11:47:18,516 INFO L544 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: 4 dim-0 vars, and 1 xjuncts. [2020-07-20 11:47:18,517 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:71, output treesize:52 [2020-07-20 11:47:18,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-07-20 11:47:18,597 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:47:18,597 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 31 [2020-07-20 11:47:18,599 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-20 11:47:18,625 INFO L624 ElimStorePlain]: treesize reduction 18, result has 52.6 percent of original size [2020-07-20 11:47:18,626 INFO L544 ElimStorePlain]: Start of recursive call 1: 6 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-20 11:47:18,627 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 7 variables, input treesize:59, output treesize:10 [2020-07-20 11:47:18,649 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 11:47:18,681 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:47:18,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:47:18,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:47:21,792 WARN L193 SmtUtils]: Spent 662.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 11:47:21,823 INFO L173 IndexEqualityManager]: detected equality via solver [2020-07-20 11:47:21,836 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:47:21,837 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 58 treesize of output 50 [2020-07-20 11:47:21,852 INFO L173 IndexEqualityManager]: detected equality via solver [2020-07-20 11:47:21,864 INFO L173 IndexEqualityManager]: detected equality via solver [2020-07-20 11:47:21,866 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 44 [2020-07-20 11:47:21,871 INFO L440 ElimStorePlain]: Different costs {0=[v_arrayElimCell_9], 1=[v_arrayElimCell_8]} [2020-07-20 11:47:21,875 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 4 [2020-07-20 11:47:21,876 INFO L544 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2020-07-20 11:47:21,882 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:47:21,895 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 79 treesize of output 67 [2020-07-20 11:47:21,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:47:21,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:47:21,900 INFO L544 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2020-07-20 11:47:21,915 INFO L624 ElimStorePlain]: treesize reduction 43, result has 10.4 percent of original size [2020-07-20 11:47:21,916 INFO L544 ElimStorePlain]: Start of recursive call 3: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-07-20 11:47:21,917 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:47:21,918 INFO L544 ElimStorePlain]: Start of recursive call 2: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-20 11:47:21,932 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:47:21,934 INFO L544 ElimStorePlain]: Start of recursive call 1: 6 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-20 11:47:21,934 INFO L244 ElimStorePlain]: Needed 5 recursive calls to eliminate 7 variables, input treesize:104, output treesize:9 [2020-07-20 11:47:21,954 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:47:21,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [15807631] [2020-07-20 11:47:21,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:47:21,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 19 [2020-07-20 11:47:21,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881070300] [2020-07-20 11:47:21,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:47:21,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:47:21,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:47:21,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=274, Unknown=2, NotChecked=0, Total=342 [2020-07-20 11:47:21,959 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 19 states. [2020-07-20 11:47:22,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:47:22,742 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2020-07-20 11:47:22,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:47:22,744 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-07-20 11:47:22,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:47:22,746 INFO L225 Difference]: With dead ends: 50 [2020-07-20 11:47:22,746 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 11:47:22,748 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 31 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=139, Invalid=561, Unknown=2, NotChecked=0, Total=702 [2020-07-20 11:47:22,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 11:47:22,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 33. [2020-07-20 11:47:22,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 11:47:22,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2020-07-20 11:47:22,759 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 26 [2020-07-20 11:47:22,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:47:22,760 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2020-07-20 11:47:22,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:47:22,760 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2020-07-20 11:47:22,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 11:47:22,761 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:47:22,761 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] [2020-07-20 11:47:22,962 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:22,963 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:47:22,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:47:22,963 INFO L82 PathProgramCache]: Analyzing trace with hash 531279049, now seen corresponding path program 2 times [2020-07-20 11:47:22,964 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:47:22,964 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1752539434] [2020-07-20 11:47:22,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:23,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:47:23,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:47:23,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:47:23,049 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:47:23,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:47:23,094 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:47:23,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1752539434] [2020-07-20 11:47:23,094 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:47:23,094 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-20 11:47:23,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065796056] [2020-07-20 11:47:23,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:47:23,097 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:47:23,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:47:23,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:47:23,097 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand 9 states. [2020-07-20 11:47:23,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:47:23,281 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2020-07-20 11:47:23,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:47:23,282 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-07-20 11:47:23,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:47:23,283 INFO L225 Difference]: With dead ends: 45 [2020-07-20 11:47:23,283 INFO L226 Difference]: Without dead ends: 39 [2020-07-20 11:47:23,284 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:47:23,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-20 11:47:23,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 35. [2020-07-20 11:47:23,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 11:47:23,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-20 11:47:23,291 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 28 [2020-07-20 11:47:23,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:47:23,292 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-20 11:47:23,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:47:23,292 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-20 11:47:23,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 11:47:23,293 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:47:23,293 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-07-20 11:47:23,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:23,500 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:47:23,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:47:23,501 INFO L82 PathProgramCache]: Analyzing trace with hash -1018004383, now seen corresponding path program 3 times [2020-07-20 11:47:23,501 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:47:23,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2010182829] [2020-07-20 11:47:23,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:23,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:47:23,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:47:23,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:47:23,575 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:47:23,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:47:23,629 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:47:23,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2010182829] [2020-07-20 11:47:23,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:47:23,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-20 11:47:23,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074101197] [2020-07-20 11:47:23,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:47:23,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:47:23,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:47:23,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:47:23,632 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 9 states. [2020-07-20 11:47:23,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:47:23,756 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2020-07-20 11:47:23,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:47:23,757 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2020-07-20 11:47:23,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:47:23,758 INFO L225 Difference]: With dead ends: 49 [2020-07-20 11:47:23,758 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 11:47:23,759 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:47:23,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 11:47:23,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-07-20 11:47:23,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-20 11:47:23,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-20 11:47:23,765 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 29 [2020-07-20 11:47:23,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:47:23,765 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-20 11:47:23,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:47:23,766 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-20 11:47:23,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 11:47:23,767 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:47:23,767 INFO L422 BasicCegarLoop]: trace histogram [2, 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] [2020-07-20 11:47:23,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:23,981 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:47:23,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:47:23,981 INFO L82 PathProgramCache]: Analyzing trace with hash 2056219107, now seen corresponding path program 4 times [2020-07-20 11:47:23,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:47:23,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1561936392] [2020-07-20 11:47:23,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:24,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:47:24,025 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:47:24,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:47:24,040 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:47:24,063 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 11:47:24,063 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 11:47:24,276 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:24,316 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 11:47:24 BoogieIcfgContainer [2020-07-20 11:47:24,316 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 11:47:24,318 INFO L168 Benchmark]: Toolchain (without parser) took 8020.61 ms. Allocated memory was 140.5 MB in the beginning and 244.3 MB in the end (delta: 103.8 MB). Free memory was 103.4 MB in the beginning and 104.3 MB in the end (delta: -826.5 kB). Peak memory consumption was 103.0 MB. Max. memory is 7.1 GB. [2020-07-20 11:47:24,318 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 140.5 MB. Free memory was 122.1 MB in the beginning and 121.9 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-20 11:47:24,319 INFO L168 Benchmark]: CACSL2BoogieTranslator took 258.40 ms. Allocated memory is still 140.5 MB. Free memory was 103.0 MB in the beginning and 92.7 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-07-20 11:47:24,320 INFO L168 Benchmark]: Boogie Preprocessor took 136.83 ms. Allocated memory was 140.5 MB in the beginning and 202.4 MB in the end (delta: 61.9 MB). Free memory was 92.5 MB in the beginning and 180.4 MB in the end (delta: -87.9 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. [2020-07-20 11:47:24,321 INFO L168 Benchmark]: RCFGBuilder took 409.76 ms. Allocated memory is still 202.4 MB. Free memory was 179.7 MB in the beginning and 162.7 MB in the end (delta: 17.0 MB). Peak memory consumption was 17.0 MB. Max. memory is 7.1 GB. [2020-07-20 11:47:24,321 INFO L168 Benchmark]: TraceAbstraction took 7210.44 ms. Allocated memory was 202.4 MB in the beginning and 244.3 MB in the end (delta: 41.9 MB). Free memory was 162.7 MB in the beginning and 104.3 MB in the end (delta: 58.4 MB). Peak memory consumption was 100.4 MB. Max. memory is 7.1 GB. [2020-07-20 11:47:24,325 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 140.5 MB. Free memory was 122.1 MB in the beginning and 121.9 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 258.40 ms. Allocated memory is still 140.5 MB. Free memory was 103.0 MB in the beginning and 92.7 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 136.83 ms. Allocated memory was 140.5 MB in the beginning and 202.4 MB in the end (delta: 61.9 MB). Free memory was 92.5 MB in the beginning and 180.4 MB in the end (delta: -87.9 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 409.76 ms. Allocated memory is still 202.4 MB. Free memory was 179.7 MB in the beginning and 162.7 MB in the end (delta: 17.0 MB). Peak memory consumption was 17.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7210.44 ms. Allocated memory was 202.4 MB in the beginning and 244.3 MB in the end (delta: 41.9 MB). Free memory was 162.7 MB in the beginning and 104.3 MB in the end (delta: 58.4 MB). Peak memory consumption was 100.4 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)=9, 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] sum[0] = 1 [L30] i=0 VAL [\old(N)=0, a={32286:0}, i=0, malloc(sizeof(int)*N)={32286:0}, N=2, sum={32288:0}] [L30] COND TRUE i