/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SequenceOfStatements --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf language data_model -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-0f64333 [2020-10-27 20:34:48,469 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-27 20:34:48,473 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-27 20:34:48,530 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-27 20:34:48,531 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-27 20:34:48,537 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-27 20:34:48,540 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-27 20:34:48,545 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-27 20:34:48,549 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-27 20:34:48,555 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-27 20:34:48,557 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-27 20:34:48,558 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-27 20:34:48,559 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-27 20:34:48,562 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-27 20:34:48,564 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-27 20:34:48,566 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-27 20:34:48,568 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-27 20:34:48,577 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-27 20:34:48,580 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-27 20:34:48,582 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-27 20:34:48,584 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-27 20:34:48,588 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-27 20:34:48,590 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-27 20:34:48,591 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-27 20:34:48,594 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-27 20:34:48,595 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-27 20:34:48,595 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-27 20:34:48,596 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-27 20:34:48,597 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-27 20:34:48,598 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-27 20:34:48,598 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-27 20:34:48,599 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-27 20:34:48,600 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-27 20:34:48,601 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-27 20:34:48,602 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-27 20:34:48,603 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-27 20:34:48,604 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-27 20:34:48,604 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-27 20:34:48,604 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-27 20:34:48,605 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-27 20:34:48,606 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-27 20:34:48,607 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-27 20:34:48,633 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-27 20:34:48,633 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-27 20:34:48,635 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-27 20:34:48,635 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-27 20:34:48,635 INFO L138 SettingsManager]: * Use SBE=true [2020-10-27 20:34:48,636 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-27 20:34:48,636 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-27 20:34:48,636 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-27 20:34:48,636 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-27 20:34:48,637 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-27 20:34:48,637 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-27 20:34:48,637 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-27 20:34:48,637 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-27 20:34:48,638 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-27 20:34:48,638 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-27 20:34:48,638 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-27 20:34:48,638 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-27 20:34:48,639 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-27 20:34:48,639 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-27 20:34:48,640 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-27 20:34:48,641 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-27 20:34:48,641 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-27 20:34:48,641 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-27 20:34:48,641 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-27 20:34:48,642 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-27 20:34:48,642 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-27 20:34:48,642 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-27 20:34:48,642 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-27 20:34:48,642 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-27 20:34:48,643 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true;unknown-allowed=true; [2020-10-27 20:34:49,113 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-27 20:34:49,161 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-27 20:34:49,165 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-27 20:34:49,166 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-27 20:34:49,167 INFO L275 PluginConnector]: CDTParser initialized [2020-10-27 20:34:49,168 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-10-27 20:34:49,247 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/30117c669/2f61df5fe58944e292348fbd55e71237/FLAG6205261c8 [2020-10-27 20:34:49,946 INFO L306 CDTParser]: Found 1 translation units. [2020-10-27 20:34:49,947 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-10-27 20:34:49,955 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/30117c669/2f61df5fe58944e292348fbd55e71237/FLAG6205261c8 [2020-10-27 20:34:49,972 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/30117c669/2f61df5fe58944e292348fbd55e71237 [2020-10-27 20:34:49,976 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-27 20:34:49,983 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-27 20:34:49,985 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-27 20:34:49,985 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-27 20:34:49,989 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-27 20:34:49,990 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 08:34:49" (1/1) ... [2020-10-27 20:34:49,995 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@242517b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 08:34:49, skipping insertion in model container [2020-10-27 20:34:49,995 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 08:34:49" (1/1) ... [2020-10-27 20:34:50,004 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-27 20:34:50,024 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-27 20:34:50,208 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 20:34:50,218 INFO L203 MainTranslator]: Completed pre-run [2020-10-27 20:34:50,246 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-27 20:34:50,263 INFO L208 MainTranslator]: Completed translation [2020-10-27 20:34:50,264 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 08:34:50 WrapperNode [2020-10-27 20:34:50,264 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-27 20:34:50,265 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-27 20:34:50,266 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-27 20:34:50,266 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-27 20:34:50,280 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 08:34:50" (1/1) ... [2020-10-27 20:34:50,280 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 08:34:50" (1/1) ... [2020-10-27 20:34:50,290 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 08:34:50" (1/1) ... [2020-10-27 20:34:50,290 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 08:34:50" (1/1) ... [2020-10-27 20:34:50,299 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 08:34:50" (1/1) ... [2020-10-27 20:34:50,305 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 08:34:50" (1/1) ... [2020-10-27 20:34:50,306 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 08:34:50" (1/1) ... [2020-10-27 20:34:50,309 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-27 20:34:50,310 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-27 20:34:50,310 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-27 20:34:50,310 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-27 20:34:50,311 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 08:34:50" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-10-27 20:34:50,399 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-27 20:34:50,399 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-27 20:34:50,399 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-27 20:34:50,400 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-27 20:34:50,400 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-27 20:34:50,400 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-27 20:34:50,400 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-27 20:34:50,400 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-27 20:34:50,400 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-27 20:34:50,401 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-27 20:34:50,401 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-10-27 20:34:50,401 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-10-27 20:34:50,401 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-27 20:34:50,401 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-27 20:34:50,401 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-27 20:34:50,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-27 20:34:50,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-27 20:34:50,402 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-27 20:34:50,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-27 20:34:50,771 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-27 20:34:50,771 INFO L298 CfgBuilder]: Removed 3 assume(true) statements. [2020-10-27 20:34:50,773 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 08:34:50 BoogieIcfgContainer [2020-10-27 20:34:50,774 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-27 20:34:50,777 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-27 20:34:50,777 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-27 20:34:50,781 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-27 20:34:50,781 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 08:34:49" (1/3) ... [2020-10-27 20:34:50,782 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@519c6c65 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 08:34:50, skipping insertion in model container [2020-10-27 20:34:50,783 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 08:34:50" (2/3) ... [2020-10-27 20:34:50,783 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@519c6c65 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 08:34:50, skipping insertion in model container [2020-10-27 20:34:50,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 08:34:50" (3/3) ... [2020-10-27 20:34:50,786 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-10-27 20:34:50,801 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-27 20:34:50,807 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-27 20:34:50,838 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-27 20:34:50,912 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-27 20:34:50,928 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-27 20:34:50,928 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-27 20:34:50,928 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-27 20:34:50,928 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-27 20:34:50,928 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-27 20:34:50,928 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-27 20:34:50,929 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-27 20:34:50,949 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-10-27 20:34:50,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-10-27 20:34:50,956 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 20:34:50,957 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 20:34:50,957 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 20:34:50,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 20:34:50,965 INFO L82 PathProgramCache]: Analyzing trace with hash -1650101419, now seen corresponding path program 1 times [2020-10-27 20:34:50,976 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 20:34:50,976 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [10084826] [2020-10-27 20:34:50,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 20:34:51,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:34:51,157 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:51,222 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:51,328 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:51,866 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:34:51,866 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 28 [2020-10-27 20:34:51,866 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-27 20:34:51,867 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 736 [2020-10-27 20:34:51,869 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:34:51,870 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 20:34:51,870 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 16 [2020-10-27 20:34:51,870 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 20:34:51,870 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-27 20:34:52,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 20:34:52,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:34:52,020 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:52,027 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:34:52,028 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 20:34:52,028 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 20:34:52,028 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 9 [2020-10-27 20:34:52,029 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:34:52,029 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 20:34:52,029 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 20:34:52,029 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 20:34:52,029 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 20:34:52,049 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 20:34:52,052 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [10084826] [2020-10-27 20:34:52,055 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 20:34:52,055 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-27 20:34:52,056 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109182273] [2020-10-27 20:34:52,064 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-27 20:34:52,064 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 20:34:52,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-27 20:34:52,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-27 20:34:52,091 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 3 states. [2020-10-27 20:34:52,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 20:34:52,230 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2020-10-27 20:34:52,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-27 20:34:52,232 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-10-27 20:34:52,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 20:34:52,241 INFO L225 Difference]: With dead ends: 56 [2020-10-27 20:34:52,241 INFO L226 Difference]: Without dead ends: 25 [2020-10-27 20:34:52,245 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-27 20:34:52,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-10-27 20:34:52,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-10-27 20:34:52,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-10-27 20:34:52,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-10-27 20:34:52,291 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 18 [2020-10-27 20:34:52,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 20:34:52,291 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-10-27 20:34:52,292 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-27 20:34:52,292 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-10-27 20:34:52,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-10-27 20:34:52,293 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 20:34:52,293 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-27 20:34:52,293 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-27 20:34:52,294 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 20:34:52,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 20:34:52,294 INFO L82 PathProgramCache]: Analyzing trace with hash 1036103897, now seen corresponding path program 1 times [2020-10-27 20:34:52,295 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 20:34:52,295 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [39736728] [2020-10-27 20:34:52,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 20:34:52,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:34:52,321 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:52,350 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:52,370 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:52,581 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:52,930 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:34:52,930 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 28 [2020-10-27 20:34:52,931 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 4 [2020-10-27 20:34:52,931 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 616 [2020-10-27 20:34:52,931 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:34:52,931 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 20:34:52,931 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-27 20:34:52,932 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 4 [2020-10-27 20:34:52,932 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 20:34:53,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 20:34:53,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:34:53,065 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:53,071 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:34:53,071 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 20:34:53,071 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 20:34:53,072 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 7 [2020-10-27 20:34:53,072 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:34:53,072 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 20:34:53,072 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 20:34:53,072 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 20:34:53,073 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 20:34:53,078 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 20:34:53,078 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [39736728] [2020-10-27 20:34:53,079 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 20:34:53,079 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-27 20:34:53,079 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689381346] [2020-10-27 20:34:53,081 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-27 20:34:53,081 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 20:34:53,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-27 20:34:53,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-10-27 20:34:53,083 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 6 states. [2020-10-27 20:34:53,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 20:34:53,296 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2020-10-27 20:34:53,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-27 20:34:53,297 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2020-10-27 20:34:53,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 20:34:53,298 INFO L225 Difference]: With dead ends: 40 [2020-10-27 20:34:53,298 INFO L226 Difference]: Without dead ends: 27 [2020-10-27 20:34:53,300 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-10-27 20:34:53,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-10-27 20:34:53,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2020-10-27 20:34:53,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-10-27 20:34:53,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-10-27 20:34:53,309 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 18 [2020-10-27 20:34:53,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 20:34:53,309 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-10-27 20:34:53,309 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-27 20:34:53,309 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-10-27 20:34:53,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-10-27 20:34:53,310 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 20:34:53,310 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] [2020-10-27 20:34:53,310 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-27 20:34:53,311 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 20:34:53,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 20:34:53,311 INFO L82 PathProgramCache]: Analyzing trace with hash -842751397, now seen corresponding path program 1 times [2020-10-27 20:34:53,311 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 20:34:53,312 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1566621150] [2020-10-27 20:34:53,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 20:34:53,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:34:53,330 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:53,352 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:53,603 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:53,619 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:54,143 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:34:54,144 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 30 [2020-10-27 20:34:54,144 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 4 [2020-10-27 20:34:54,144 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 818 [2020-10-27 20:34:54,144 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:34:54,145 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 9 [2020-10-27 20:34:54,145 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-27 20:34:54,145 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 11 [2020-10-27 20:34:54,145 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 20:34:54,352 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 21 [2020-10-27 20:34:54,694 WARN L193 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 26 [2020-10-27 20:34:54,843 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 27 [2020-10-27 20:34:55,123 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 25 [2020-10-27 20:34:55,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 20:34:55,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:34:55,282 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:55,293 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:34:55,293 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 20:34:55,293 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 20:34:55,294 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 15 [2020-10-27 20:34:55,294 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:34:55,294 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 20:34:55,294 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 20:34:55,294 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 20:34:55,295 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 20:34:55,306 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 20:34:55,308 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1566621150] [2020-10-27 20:34:55,308 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 20:34:55,308 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-10-27 20:34:55,309 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717470172] [2020-10-27 20:34:55,310 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-27 20:34:55,312 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 20:34:55,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-27 20:34:55,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2020-10-27 20:34:55,313 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 11 states. [2020-10-27 20:34:55,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 20:34:55,927 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2020-10-27 20:34:55,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-27 20:34:55,928 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2020-10-27 20:34:55,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 20:34:55,931 INFO L225 Difference]: With dead ends: 44 [2020-10-27 20:34:55,931 INFO L226 Difference]: Without dead ends: 41 [2020-10-27 20:34:55,932 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2020-10-27 20:34:55,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-10-27 20:34:55,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 35. [2020-10-27 20:34:55,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-10-27 20:34:55,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2020-10-27 20:34:55,946 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 20 [2020-10-27 20:34:55,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 20:34:55,947 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2020-10-27 20:34:55,947 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-27 20:34:55,947 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2020-10-27 20:34:55,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-27 20:34:55,948 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 20:34:55,948 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] [2020-10-27 20:34:55,949 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-27 20:34:55,949 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 20:34:55,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 20:34:55,949 INFO L82 PathProgramCache]: Analyzing trace with hash 1758542685, now seen corresponding path program 2 times [2020-10-27 20:34:55,950 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 20:34:55,950 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [113051007] [2020-10-27 20:34:55,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 20:34:55,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:34:55,970 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:55,989 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:56,037 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:56,054 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:56,462 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:57,212 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:34:57,212 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 32 [2020-10-27 20:34:57,212 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-27 20:34:57,213 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1247 [2020-10-27 20:34:57,213 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:34:57,213 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 11 [2020-10-27 20:34:57,213 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-27 20:34:57,215 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 13 [2020-10-27 20:34:57,216 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-27 20:34:57,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 20:34:57,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:34:57,498 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:57,507 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:34:57,507 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 20:34:57,508 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 20:34:57,508 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 10 [2020-10-27 20:34:57,509 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:34:57,509 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 20:34:57,509 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 20:34:57,509 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 20:34:57,509 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 20:34:57,521 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-27 20:34:57,521 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [113051007] [2020-10-27 20:34:57,522 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 20:34:57,522 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-27 20:34:57,522 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205017139] [2020-10-27 20:34:57,523 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-27 20:34:57,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 20:34:57,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-27 20:34:57,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-10-27 20:34:57,525 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand 12 states. [2020-10-27 20:34:58,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 20:34:58,154 INFO L93 Difference]: Finished difference Result 47 states and 51 transitions. [2020-10-27 20:34:58,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-27 20:34:58,156 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2020-10-27 20:34:58,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 20:34:58,158 INFO L225 Difference]: With dead ends: 47 [2020-10-27 20:34:58,159 INFO L226 Difference]: Without dead ends: 44 [2020-10-27 20:34:58,160 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2020-10-27 20:34:58,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-10-27 20:34:58,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 32. [2020-10-27 20:34:58,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-10-27 20:34:58,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-10-27 20:34:58,169 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 22 [2020-10-27 20:34:58,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 20:34:58,169 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-10-27 20:34:58,169 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-27 20:34:58,169 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-10-27 20:34:58,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-27 20:34:58,170 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 20:34:58,170 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] [2020-10-27 20:34:58,171 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-27 20:34:58,171 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 20:34:58,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 20:34:58,171 INFO L82 PathProgramCache]: Analyzing trace with hash 1880186433, now seen corresponding path program 1 times [2020-10-27 20:34:58,172 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 20:34:58,172 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [822875504] [2020-10-27 20:34:58,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 20:34:58,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:34:58,192 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:58,208 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:58,314 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:58,345 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:58,379 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:59,392 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:34:59,392 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-10-27 20:34:59,392 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-27 20:34:59,393 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1205 [2020-10-27 20:34:59,393 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:34:59,394 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-27 20:34:59,394 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-27 20:34:59,394 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 16 [2020-10-27 20:34:59,394 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 20:34:59,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 20:34:59,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:34:59,493 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:59,497 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:34:59,498 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 20:34:59,498 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 20:34:59,498 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 6 [2020-10-27 20:34:59,498 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:34:59,499 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 20:34:59,499 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 20:34:59,499 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 20:34:59,499 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 20:34:59,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-10-27 20:34:59,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:34:59,517 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:59,526 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:34:59,526 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-27 20:34:59,526 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 20:34:59,526 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 9 [2020-10-27 20:34:59,527 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:34:59,527 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-27 20:34:59,527 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 20:34:59,527 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-27 20:34:59,527 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 20:34:59,533 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-27 20:34:59,534 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [822875504] [2020-10-27 20:34:59,534 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 20:34:59,534 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-27 20:34:59,535 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911597570] [2020-10-27 20:34:59,536 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-27 20:34:59,536 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 20:34:59,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-27 20:34:59,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-10-27 20:34:59,538 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 8 states. [2020-10-27 20:34:59,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 20:34:59,726 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2020-10-27 20:34:59,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-27 20:34:59,727 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 28 [2020-10-27 20:34:59,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 20:34:59,728 INFO L225 Difference]: With dead ends: 52 [2020-10-27 20:34:59,728 INFO L226 Difference]: Without dead ends: 35 [2020-10-27 20:34:59,731 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2020-10-27 20:34:59,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-10-27 20:34:59,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2020-10-27 20:34:59,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-10-27 20:34:59,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-10-27 20:34:59,740 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 28 [2020-10-27 20:34:59,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 20:34:59,741 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-10-27 20:34:59,741 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-27 20:34:59,741 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-10-27 20:34:59,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-10-27 20:34:59,742 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 20:34:59,742 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] [2020-10-27 20:34:59,742 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-27 20:34:59,743 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 20:34:59,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 20:34:59,743 INFO L82 PathProgramCache]: Analyzing trace with hash 1308480835, now seen corresponding path program 2 times [2020-10-27 20:34:59,744 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 20:34:59,744 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1639892369] [2020-10-27 20:34:59,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 20:34:59,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:34:59,759 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:59,791 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:59,807 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:59,822 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:34:59,909 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:35:00,815 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:35:00,816 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 42 [2020-10-27 20:35:00,816 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-27 20:35:00,816 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1061 [2020-10-27 20:35:00,816 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:35:00,816 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-27 20:35:00,817 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-10-27 20:35:00,817 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 4 [2020-10-27 20:35:00,820 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-27 20:35:00,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 20:35:00,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:35:00,888 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:35:00,891 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:35:00,891 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 20:35:00,891 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 20:35:00,891 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-27 20:35:00,892 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:35:00,892 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 20:35:00,892 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 20:35:00,892 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 20:35:00,892 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 20:35:00,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-10-27 20:35:00,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:35:00,897 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:35:00,898 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:35:00,898 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-27 20:35:00,899 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 20:35:00,899 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-27 20:35:00,899 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:35:00,899 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 20:35:00,899 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 6 [2020-10-27 20:35:00,899 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 20:35:00,900 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 20:35:00,902 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-27 20:35:00,903 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1639892369] [2020-10-27 20:35:00,903 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-27 20:35:00,903 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-27 20:35:00,903 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103134999] [2020-10-27 20:35:00,904 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-27 20:35:00,904 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 20:35:00,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-27 20:35:00,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-27 20:35:00,905 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 6 states. [2020-10-27 20:35:01,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 20:35:01,065 INFO L93 Difference]: Finished difference Result 62 states and 66 transitions. [2020-10-27 20:35:01,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-27 20:35:01,066 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 30 [2020-10-27 20:35:01,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 20:35:01,067 INFO L225 Difference]: With dead ends: 62 [2020-10-27 20:35:01,067 INFO L226 Difference]: Without dead ends: 38 [2020-10-27 20:35:01,068 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-10-27 20:35:01,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-10-27 20:35:01,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 35. [2020-10-27 20:35:01,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-10-27 20:35:01,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2020-10-27 20:35:01,075 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 30 [2020-10-27 20:35:01,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 20:35:01,076 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2020-10-27 20:35:01,076 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-27 20:35:01,076 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2020-10-27 20:35:01,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-10-27 20:35:01,077 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 20:35:01,077 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, 1] [2020-10-27 20:35:01,077 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-27 20:35:01,078 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 20:35:01,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 20:35:01,078 INFO L82 PathProgramCache]: Analyzing trace with hash 1267731333, now seen corresponding path program 1 times [2020-10-27 20:35:01,079 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 20:35:01,079 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [560899586] [2020-10-27 20:35:01,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 20:35:01,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:35:01,101 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:35:01,133 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:35:01,909 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:35:01,910 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 44 [2020-10-27 20:35:01,910 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-27 20:35:01,910 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 816 [2020-10-27 20:35:01,911 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:35:01,911 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-27 20:35:01,911 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-10-27 20:35:01,911 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-10-27 20:35:01,912 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-27 20:35:02,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-27 20:35:02,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:35:02,004 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:35:02,009 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:35:02,010 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-27 20:35:02,010 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 20:35:02,010 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-10-27 20:35:02,010 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:35:02,010 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 20:35:02,010 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-27 20:35:02,011 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 20:35:02,011 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 20:35:02,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-10-27 20:35:02,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-27 20:35:02,017 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-27 20:35:02,018 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-27 20:35:02,018 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-27 20:35:02,019 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-27 20:35:02,019 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-27 20:35:02,019 FATAL L256 erpolLogProxyWrapper]: Heuristic: DEEPEST [2020-10-27 20:35:02,019 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-27 20:35:02,019 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 6 [2020-10-27 20:35:02,020 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-27 20:35:02,020 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-27 20:35:02,023 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-27 20:35:02,023 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [560899586] [2020-10-27 20:35:02,024 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-27 20:35:02,024 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-27 20:35:02,024 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5110809] [2020-10-27 20:35:02,025 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-27 20:35:02,026 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-27 20:35:02,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-27 20:35:02,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-27 20:35:02,028 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 7 states. [2020-10-27 20:35:02,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-27 20:35:02,218 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2020-10-27 20:35:02,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-27 20:35:02,219 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 32 [2020-10-27 20:35:02,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-27 20:35:02,220 INFO L225 Difference]: With dead ends: 68 [2020-10-27 20:35:02,220 INFO L226 Difference]: Without dead ends: 44 [2020-10-27 20:35:02,222 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-10-27 20:35:02,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-10-27 20:35:02,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 37. [2020-10-27 20:35:02,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-10-27 20:35:02,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2020-10-27 20:35:02,238 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 32 [2020-10-27 20:35:02,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-27 20:35:02,240 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2020-10-27 20:35:02,240 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-27 20:35:02,241 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2020-10-27 20:35:02,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-10-27 20:35:02,244 INFO L414 BasicCegarLoop]: Found error trace [2020-10-27 20:35:02,245 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] [2020-10-27 20:35:02,245 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-27 20:35:02,245 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-27 20:35:02,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-27 20:35:02,246 INFO L82 PathProgramCache]: Analyzing trace with hash 762165575, now seen corresponding path program 2 times [2020-10-27 20:35:02,246 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-27 20:35:02,247 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1524129099] [2020-10-27 20:35:02,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-27 20:35:02,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-27 20:35:02,271 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-27 20:35:02,271 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-27 20:35:02,276 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-10-27 20:35:02,303 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 08:35:02 BoogieIcfgContainer [2020-10-27 20:35:02,303 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-27 20:35:02,310 INFO L168 Benchmark]: Toolchain (without parser) took 12326.75 ms. Allocated memory was 151.0 MB in the beginning and 262.1 MB in the end (delta: 111.1 MB). Free memory was 126.8 MB in the beginning and 172.3 MB in the end (delta: -45.5 MB). Peak memory consumption was 66.6 MB. Max. memory is 8.0 GB. [2020-10-27 20:35:02,312 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 151.0 MB. Free memory is still 121.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-27 20:35:02,313 INFO L168 Benchmark]: CACSL2BoogieTranslator took 280.08 ms. Allocated memory is still 151.0 MB. Free memory was 126.1 MB in the beginning and 116.4 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-27 20:35:02,314 INFO L168 Benchmark]: Boogie Preprocessor took 43.47 ms. Allocated memory is still 151.0 MB. Free memory was 116.4 MB in the beginning and 114.8 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-10-27 20:35:02,315 INFO L168 Benchmark]: RCFGBuilder took 464.06 ms. Allocated memory is still 151.0 MB. Free memory was 114.6 MB in the beginning and 99.0 MB in the end (delta: 15.5 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. [2020-10-27 20:35:02,315 INFO L168 Benchmark]: TraceAbstraction took 11526.61 ms. Allocated memory was 151.0 MB in the beginning and 262.1 MB in the end (delta: 111.1 MB). Free memory was 98.4 MB in the beginning and 172.3 MB in the end (delta: -73.9 MB). Peak memory consumption was 38.3 MB. Max. memory is 8.0 GB. [2020-10-27 20:35:02,327 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 151.0 MB. Free memory is still 121.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 280.08 ms. Allocated memory is still 151.0 MB. Free memory was 126.1 MB in the beginning and 116.4 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 43.47 ms. Allocated memory is still 151.0 MB. Free memory was 116.4 MB in the beginning and 114.8 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 464.06 ms. Allocated memory is still 151.0 MB. Free memory was 114.6 MB in the beginning and 99.0 MB in the end (delta: 15.5 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 11526.61 ms. Allocated memory was 151.0 MB in the beginning and 262.1 MB in the end (delta: 111.1 MB). Free memory was 98.4 MB in the beginning and 172.3 MB in the end (delta: -73.9 MB). Peak memory consumption was 38.3 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND FALSE !(i >= 0) [L34] j = MAX-1 [L35] i=0 [L35] COND TRUE i