/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/ifeqn4f.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:46:17,901 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:46:17,911 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:46:17,930 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:46:17,930 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:46:17,932 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:46:17,934 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:46:17,937 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:46:17,938 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:46:17,939 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:46:17,940 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:46:17,942 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:46:17,942 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:46:17,943 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:46:17,945 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:46:17,946 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:46:17,947 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:46:17,948 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:46:17,950 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:46:17,952 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:46:17,954 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:46:17,955 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:46:17,957 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:46:17,958 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:46:17,961 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:46:17,970 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:46:17,971 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:46:17,971 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:46:17,972 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 11:46:17,997 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:46:17,998 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:46:17,999 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:46:17,999 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:46:18,001 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:46:18,002 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:46:18,002 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:46:18,002 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:46:18,002 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:46:18,002 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:46:18,003 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:46:18,003 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:46:18,003 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:46:18,003 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:46:18,003 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:46:18,004 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:46:18,004 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:46:18,004 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:46:18,004 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:46:18,004 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:46:18,005 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:46:18,005 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:46:18,005 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:46:18,007 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:46:18,007 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:46:18,007 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:46:18,007 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:46:18,008 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:46:18,008 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:46:18,008 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 11:46:18,297 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:46:18,312 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:46:18,316 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:46:18,318 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:46:18,318 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:46:18,319 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-fpi/ifeqn4f.c [2020-07-20 11:46:18,401 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/291242aee/542c1bc8420b4ad3a1cababb75b8b0e5/FLAG50208ec25 [2020-07-20 11:46:18,942 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:46:18,943 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-fpi/ifeqn4f.c [2020-07-20 11:46:18,952 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/291242aee/542c1bc8420b4ad3a1cababb75b8b0e5/FLAG50208ec25 [2020-07-20 11:46:19,269 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/291242aee/542c1bc8420b4ad3a1cababb75b8b0e5 [2020-07-20 11:46:19,278 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:46:19,281 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:46:19,282 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:46:19,282 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:46:19,286 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:46:19,287 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:46:19" (1/1) ... [2020-07-20 11:46:19,290 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@9db346e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:46:19, skipping insertion in model container [2020-07-20 11:46:19,290 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:46:19" (1/1) ... [2020-07-20 11:46:19,299 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:46:19,319 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:46:19,529 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:46:19,541 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:46:19,564 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:46:19,581 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:46:19,582 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:46:19 WrapperNode [2020-07-20 11:46:19,582 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:46:19,583 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:46:19,583 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:46:19,583 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:46:19,595 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:46:19" (1/1) ... [2020-07-20 11:46:19,596 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:46:19" (1/1) ... [2020-07-20 11:46:19,681 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:46:19" (1/1) ... [2020-07-20 11:46:19,681 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:46:19" (1/1) ... [2020-07-20 11:46:19,690 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:46:19" (1/1) ... [2020-07-20 11:46:19,696 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:46:19" (1/1) ... [2020-07-20 11:46:19,698 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:46:19" (1/1) ... [2020-07-20 11:46:19,700 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:46:19,701 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:46:19,701 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:46:19,701 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:46:19,704 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:46:19" (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 11:46:19,777 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:46:19,777 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:46:19,777 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 11:46:19,777 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 11:46:19,777 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:46:19,778 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:46:19,778 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 11:46:19,778 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 11:46:19,778 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 11:46:19,778 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:46:19,778 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-20 11:46:19,779 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:46:19,779 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-20 11:46:19,779 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 11:46:19,779 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 11:46:19,779 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:46:19,780 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:46:19,780 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 11:46:20,132 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:46:20,133 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 11:46:20,137 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:46:20 BoogieIcfgContainer [2020-07-20 11:46:20,137 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:46:20,139 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:46:20,139 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:46:20,142 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:46:20,143 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:46:19" (1/3) ... [2020-07-20 11:46:20,144 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a22bef4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:46:20, skipping insertion in model container [2020-07-20 11:46:20,144 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:46:19" (2/3) ... [2020-07-20 11:46:20,145 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a22bef4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:46:20, skipping insertion in model container [2020-07-20 11:46:20,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:46:20" (3/3) ... [2020-07-20 11:46:20,147 INFO L109 eAbstractionObserver]: Analyzing ICFG ifeqn4f.c [2020-07-20 11:46:20,160 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:46:20,169 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:46:20,185 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:46:20,211 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:46:20,212 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:46:20,212 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:46:20,212 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:46:20,213 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:46:20,213 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:46:20,213 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:46:20,213 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:46:20,235 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states. [2020-07-20 11:46:20,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 11:46:20,243 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:46:20,244 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] [2020-07-20 11:46:20,245 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:46:20,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:46:20,253 INFO L82 PathProgramCache]: Analyzing trace with hash -294712258, now seen corresponding path program 1 times [2020-07-20 11:46:20,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:46:20,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [714177152] [2020-07-20 11:46:20,264 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 11:46:20,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:46:20,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 11:46:20,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:46:20,400 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 11:46:20,401 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:46:20,402 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [714177152] [2020-07-20 11:46:20,403 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:46:20,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 11:46:20,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125572079] [2020-07-20 11:46:20,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 11:46:20,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:46:20,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 11:46:20,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:46:20,431 INFO L87 Difference]: Start difference. First operand 36 states. Second operand 2 states. [2020-07-20 11:46:20,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:46:20,459 INFO L93 Difference]: Finished difference Result 62 states and 81 transitions. [2020-07-20 11:46:20,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 11:46:20,461 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2020-07-20 11:46:20,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:46:20,471 INFO L225 Difference]: With dead ends: 62 [2020-07-20 11:46:20,471 INFO L226 Difference]: Without dead ends: 31 [2020-07-20 11:46:20,475 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 21 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 11:46:20,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-20 11:46:20,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-20 11:46:20,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 11:46:20,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-07-20 11:46:20,523 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-07-20 11:46:20,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:46:20,524 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-07-20 11:46:20,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 11:46:20,524 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-07-20 11:46:20,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 11:46:20,525 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:46:20,526 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] [2020-07-20 11:46:20,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:46:20,740 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:46:20,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:46:20,742 INFO L82 PathProgramCache]: Analyzing trace with hash -2054124171, now seen corresponding path program 1 times [2020-07-20 11:46:20,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:46:20,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [940367489] [2020-07-20 11:46:20,743 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 11:46:20,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:46:20,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:46:20,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:46:20,863 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 11:46:20,864 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:46:20,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [940367489] [2020-07-20 11:46:20,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:46:20,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 11:46:20,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355047687] [2020-07-20 11:46:20,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 11:46:20,869 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:46:20,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 11:46:20,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 11:46:20,870 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 4 states. [2020-07-20 11:46:21,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:46:21,008 INFO L93 Difference]: Finished difference Result 56 states and 67 transitions. [2020-07-20 11:46:21,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 11:46:21,009 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2020-07-20 11:46:21,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:46:21,013 INFO L225 Difference]: With dead ends: 56 [2020-07-20 11:46:21,013 INFO L226 Difference]: Without dead ends: 41 [2020-07-20 11:46:21,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 19 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 11:46:21,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-07-20 11:46:21,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 33. [2020-07-20 11:46:21,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 11:46:21,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-07-20 11:46:21,028 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 22 [2020-07-20 11:46:21,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:46:21,029 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-07-20 11:46:21,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 11:46:21,029 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-07-20 11:46:21,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 11:46:21,030 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:46:21,030 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, 1] [2020-07-20 11:46:21,243 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:46:21,244 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:46:21,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:46:21,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1477618916, now seen corresponding path program 1 times [2020-07-20 11:46:21,246 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:46:21,246 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118626060] [2020-07-20 11:46:21,247 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 11:46:21,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:46:21,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:46:21,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:46:21,349 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 11:46:21,350 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-20 11:46:21,354 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:46:21,355 INFO L544 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-20 11:46:21,355 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:11, output treesize:7 [2020-07-20 11:46:21,404 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:46:21,405 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2020-07-20 11:46:21,406 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-07-20 11:46:21,426 INFO L624 ElimStorePlain]: treesize reduction 9, result has 43.8 percent of original size [2020-07-20 11:46:21,427 INFO L544 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-20 11:46:21,427 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:22, output treesize:7 [2020-07-20 11:46:21,462 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:46:21,463 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:46:21,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1118626060] [2020-07-20 11:46:21,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:46:21,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 11:46:21,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406590213] [2020-07-20 11:46:21,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 11:46:21,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:46:21,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 11:46:21,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-07-20 11:46:21,466 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 7 states. [2020-07-20 11:46:21,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:46:21,627 INFO L93 Difference]: Finished difference Result 52 states and 59 transitions. [2020-07-20 11:46:21,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:46:21,628 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2020-07-20 11:46:21,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:46:21,629 INFO L225 Difference]: With dead ends: 52 [2020-07-20 11:46:21,630 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 11:46:21,630 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:46:21,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 11:46:21,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 43. [2020-07-20 11:46:21,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-20 11:46:21,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2020-07-20 11:46:21,641 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 28 [2020-07-20 11:46:21,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:46:21,641 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2020-07-20 11:46:21,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 11:46:21,641 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2020-07-20 11:46:21,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 11:46:21,643 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:46:21,643 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, 1] [2020-07-20 11:46:21,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:46:21,854 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:46:21,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:46:21,855 INFO L82 PathProgramCache]: Analyzing trace with hash -797560546, now seen corresponding path program 1 times [2020-07-20 11:46:21,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:46:21,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1917650891] [2020-07-20 11:46:21,856 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 11:46:21,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:46:21,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:46:21,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:46:21,915 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:46:21,916 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:46:21,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1917650891] [2020-07-20 11:46:21,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:46:21,917 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:46:21,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774486638] [2020-07-20 11:46:21,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:46:21,918 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:46:21,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:46:21,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:46:21,918 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand 3 states. [2020-07-20 11:46:21,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:46:21,964 INFO L93 Difference]: Finished difference Result 74 states and 86 transitions. [2020-07-20 11:46:21,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:46:21,965 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-20 11:46:21,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:46:21,966 INFO L225 Difference]: With dead ends: 74 [2020-07-20 11:46:21,966 INFO L226 Difference]: Without dead ends: 45 [2020-07-20 11:46:21,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:46:21,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-20 11:46:21,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 41. [2020-07-20 11:46:21,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 11:46:21,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-07-20 11:46:21,975 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 28 [2020-07-20 11:46:21,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:46:21,976 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-07-20 11:46:21,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:46:21,976 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-07-20 11:46:21,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-07-20 11:46:21,977 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:46:21,978 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, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:46:22,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:46:22,190 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:46:22,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:46:22,190 INFO L82 PathProgramCache]: Analyzing trace with hash -622618382, now seen corresponding path program 1 times [2020-07-20 11:46:22,191 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:46:22,191 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1307804689] [2020-07-20 11:46:22,191 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 11:46:22,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:46:22,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:46:22,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:46:22,305 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:46:22,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:46:22,372 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:46:22,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1307804689] [2020-07-20 11:46:22,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:46:22,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-20 11:46:22,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947392017] [2020-07-20 11:46:22,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:46:22,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:46:22,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:46:22,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:46:22,379 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 9 states. [2020-07-20 11:46:22,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:46:22,578 INFO L93 Difference]: Finished difference Result 91 states and 103 transitions. [2020-07-20 11:46:22,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:46:22,578 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-07-20 11:46:22,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:46:22,580 INFO L225 Difference]: With dead ends: 91 [2020-07-20 11:46:22,580 INFO L226 Difference]: Without dead ends: 55 [2020-07-20 11:46:22,581 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 61 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:46:22,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-07-20 11:46:22,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 45. [2020-07-20 11:46:22,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 11:46:22,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-07-20 11:46:22,590 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-07-20 11:46:22,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:46:22,590 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-07-20 11:46:22,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:46:22,590 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-07-20 11:46:22,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-20 11:46:22,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:46:22,592 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 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, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:46:22,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:46:22,793 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:46:22,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:46:22,794 INFO L82 PathProgramCache]: Analyzing trace with hash 60389999, now seen corresponding path program 1 times [2020-07-20 11:46:22,795 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:46:22,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [488508434] [2020-07-20 11:46:22,796 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 11:46:22,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:46:22,849 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:46:22,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:46:22,873 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:46:22,904 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 11:46:22,904 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 11:46:23,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:46:23,215 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 11:46:23 BoogieIcfgContainer [2020-07-20 11:46:23,216 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 11:46:23,218 INFO L168 Benchmark]: Toolchain (without parser) took 3938.02 ms. Allocated memory was 138.9 MB in the beginning and 236.5 MB in the end (delta: 97.5 MB). Free memory was 103.7 MB in the beginning and 113.0 MB in the end (delta: -9.2 MB). Peak memory consumption was 88.3 MB. Max. memory is 7.1 GB. [2020-07-20 11:46:23,222 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 138.9 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 11:46:23,223 INFO L168 Benchmark]: CACSL2BoogieTranslator took 300.27 ms. Allocated memory is still 138.9 MB. Free memory was 103.3 MB in the beginning and 92.6 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. [2020-07-20 11:46:23,224 INFO L168 Benchmark]: Boogie Preprocessor took 117.88 ms. Allocated memory was 138.9 MB in the beginning and 202.9 MB in the end (delta: 64.0 MB). Free memory was 92.6 MB in the beginning and 181.0 MB in the end (delta: -88.4 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. [2020-07-20 11:46:23,225 INFO L168 Benchmark]: RCFGBuilder took 436.43 ms. Allocated memory is still 202.9 MB. Free memory was 181.0 MB in the beginning and 163.6 MB in the end (delta: 17.4 MB). Peak memory consumption was 17.4 MB. Max. memory is 7.1 GB. [2020-07-20 11:46:23,226 INFO L168 Benchmark]: TraceAbstraction took 3076.99 ms. Allocated memory was 202.9 MB in the beginning and 236.5 MB in the end (delta: 33.6 MB). Free memory was 163.0 MB in the beginning and 113.0 MB in the end (delta: 50.0 MB). Peak memory consumption was 83.5 MB. Max. memory is 7.1 GB. [2020-07-20 11:46:23,235 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 138.9 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 300.27 ms. Allocated memory is still 138.9 MB. Free memory was 103.3 MB in the beginning and 92.6 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 117.88 ms. Allocated memory was 138.9 MB in the beginning and 202.9 MB in the end (delta: 64.0 MB). Free memory was 92.6 MB in the beginning and 181.0 MB in the end (delta: -88.4 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 436.43 ms. Allocated memory is still 202.9 MB. Free memory was 181.0 MB in the beginning and 163.6 MB in the end (delta: 17.4 MB). Peak memory consumption was 17.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3076.99 ms. Allocated memory was 202.9 MB in the beginning and 236.5 MB in the end (delta: 33.6 MB). Free memory was 163.0 MB in the beginning and 113.0 MB in the end (delta: 50.0 MB). Peak memory consumption was 83.5 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)=6, 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 *a = malloc(sizeof(long long)*N); [L27] long long *b = malloc(sizeof(long long)*N); [L29] i=0 VAL [\old(N)=0, a={-1:0}, b={-2:0}, i=0, malloc(sizeof(long long)*N)={-2:0}, malloc(sizeof(long long)*N)={-1:0}, N=2] [L29] COND TRUE i