/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.2 --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 -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-15 00:09:28,079 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-15 00:09:28,082 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-15 00:09:28,110 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-15 00:09:28,110 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-15 00:09:28,118 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-15 00:09:28,119 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-15 00:09:28,123 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-15 00:09:28,125 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-15 00:09:28,128 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-15 00:09:28,129 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-15 00:09:28,130 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-15 00:09:28,130 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-15 00:09:28,133 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-15 00:09:28,136 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-15 00:09:28,138 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-15 00:09:28,139 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-15 00:09:28,141 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-15 00:09:28,142 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-15 00:09:28,150 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-15 00:09:28,152 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-15 00:09:28,153 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-15 00:09:28,153 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-15 00:09:28,154 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-15 00:09:28,166 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-15 00:09:28,166 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-15 00:09:28,166 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-15 00:09:28,167 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-15 00:09:28,167 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-15 00:09:28,171 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-15 00:09:28,172 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-15 00:09:28,172 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-15 00:09:28,173 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-15 00:09:28,177 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-15 00:09:28,178 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-15 00:09:28,178 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-15 00:09:28,178 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-15 00:09:28,179 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-15 00:09:28,179 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-15 00:09:28,183 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-15 00:09:28,184 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-15 00:09:28,184 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 [2020-10-15 00:09:28,224 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-15 00:09:28,224 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-15 00:09:28,227 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-15 00:09:28,227 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-15 00:09:28,227 INFO L138 SettingsManager]: * Use SBE=true [2020-10-15 00:09:28,227 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-15 00:09:28,228 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-15 00:09:28,228 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-15 00:09:28,228 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-15 00:09:28,228 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-15 00:09:28,229 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-15 00:09:28,229 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-15 00:09:28,230 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-15 00:09:28,230 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-15 00:09:28,230 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-15 00:09:28,230 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-15 00:09:28,230 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-15 00:09:28,231 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-15 00:09:28,231 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-15 00:09:28,231 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-15 00:09:28,231 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-15 00:09:28,231 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-15 00:09:28,232 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-15 00:09:28,232 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-15 00:09:28,232 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-15 00:09:28,232 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-15 00:09:28,232 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-15 00:09:28,233 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-15 00:09:28,233 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-15 00:09:28,233 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 -> 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=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true;unknown-allowed=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=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true;unknown-allowed=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=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true;unknown-allowed=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=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true;unknown-allowed=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=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true;unknown-allowed=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=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true;unknown-allowed=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=SMALLESTAMONGWIDE;tolerance=0.2;log-additional-information=true;unknown-allowed=true; [2020-10-15 00:09:28,511 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-15 00:09:28,522 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-15 00:09:28,526 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-15 00:09:28,527 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-15 00:09:28,527 INFO L275 PluginConnector]: CDTParser initialized [2020-10-15 00:09:28,528 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-10-15 00:09:28,587 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/978d01cb5/12dd49e4515241878d5e4cd0f86d601c/FLAG74eab12fe [2020-10-15 00:09:29,010 INFO L306 CDTParser]: Found 1 translation units. [2020-10-15 00:09:29,011 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-10-15 00:09:29,017 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/978d01cb5/12dd49e4515241878d5e4cd0f86d601c/FLAG74eab12fe [2020-10-15 00:09:29,441 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/978d01cb5/12dd49e4515241878d5e4cd0f86d601c [2020-10-15 00:09:29,451 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-15 00:09:29,454 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-15 00:09:29,458 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-15 00:09:29,458 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-15 00:09:29,462 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-15 00:09:29,463 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 12:09:29" (1/1) ... [2020-10-15 00:09:29,467 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ad9231a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:09:29, skipping insertion in model container [2020-10-15 00:09:29,468 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 12:09:29" (1/1) ... [2020-10-15 00:09:29,476 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-15 00:09:29,500 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-15 00:09:29,721 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-15 00:09:29,725 INFO L203 MainTranslator]: Completed pre-run [2020-10-15 00:09:29,748 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-15 00:09:29,768 INFO L208 MainTranslator]: Completed translation [2020-10-15 00:09:29,768 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:09:29 WrapperNode [2020-10-15 00:09:29,768 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-15 00:09:29,769 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-15 00:09:29,769 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-15 00:09:29,770 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-15 00:09:29,865 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:09:29" (1/1) ... [2020-10-15 00:09:29,865 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:09:29" (1/1) ... [2020-10-15 00:09:29,872 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:09:29" (1/1) ... [2020-10-15 00:09:29,873 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:09:29" (1/1) ... [2020-10-15 00:09:29,880 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:09:29" (1/1) ... [2020-10-15 00:09:29,886 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:09:29" (1/1) ... [2020-10-15 00:09:29,888 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:09:29" (1/1) ... [2020-10-15 00:09:29,890 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-15 00:09:29,891 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-15 00:09:29,891 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-15 00:09:29,891 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-15 00:09:29,892 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:09:29" (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 [2020-10-15 00:09:29,951 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-15 00:09:29,951 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-15 00:09:29,951 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-15 00:09:29,951 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-15 00:09:29,951 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-15 00:09:29,951 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-15 00:09:29,951 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-15 00:09:29,952 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-10-15 00:09:29,952 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-10-15 00:09:29,952 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-15 00:09:29,952 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-15 00:09:29,952 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-15 00:09:29,952 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-15 00:09:29,953 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-15 00:09:29,953 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-15 00:09:29,953 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-15 00:09:30,221 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-15 00:09:30,222 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-10-15 00:09:30,226 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 12:09:30 BoogieIcfgContainer [2020-10-15 00:09:30,227 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-15 00:09:30,228 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-15 00:09:30,228 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-15 00:09:30,231 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-15 00:09:30,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 12:09:29" (1/3) ... [2020-10-15 00:09:30,233 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3170baa5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 12:09:30, skipping insertion in model container [2020-10-15 00:09:30,233 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 12:09:29" (2/3) ... [2020-10-15 00:09:30,233 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3170baa5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 12:09:30, skipping insertion in model container [2020-10-15 00:09:30,233 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 12:09:30" (3/3) ... [2020-10-15 00:09:30,235 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-10-15 00:09:30,246 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-15 00:09:30,254 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-15 00:09:30,268 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-15 00:09:30,295 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-15 00:09:30,295 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-15 00:09:30,295 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-15 00:09:30,295 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-15 00:09:30,296 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-15 00:09:30,296 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-15 00:09:30,296 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-15 00:09:30,296 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-15 00:09:30,317 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-10-15 00:09:30,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-10-15 00:09:30,323 INFO L414 BasicCegarLoop]: Found error trace [2020-10-15 00:09:30,324 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-15 00:09:30,325 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-15 00:09:30,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-15 00:09:30,332 INFO L82 PathProgramCache]: Analyzing trace with hash -474003824, now seen corresponding path program 1 times [2020-10-15 00:09:30,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-15 00:09:30,339 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [619192077] [2020-10-15 00:09:30,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-15 00:09:30,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:30,482 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:30,529 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:30,626 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:31,217 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:31,218 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 25 [2020-10-15 00:09:31,218 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-15 00:09:31,219 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 752 [2020-10-15 00:09:31,222 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:31,223 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:31,224 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-15 00:09:31,224 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-10-15 00:09:31,224 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-15 00:09:31,225 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 5 [2020-10-15 00:09:31,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-15 00:09:31,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:31,366 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:31,373 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:31,373 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-15 00:09:31,373 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-15 00:09:31,374 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 7 [2020-10-15 00:09:31,375 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:31,375 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:31,375 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-15 00:09:31,376 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-15 00:09:31,376 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-15 00:09:31,376 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:31,385 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-15 00:09:31,388 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [619192077] [2020-10-15 00:09:31,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-15 00:09:31,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-15 00:09:31,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098711032] [2020-10-15 00:09:31,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-15 00:09:31,401 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-15 00:09:31,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-15 00:09:31,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-15 00:09:31,414 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 6 states. [2020-10-15 00:09:31,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-15 00:09:31,630 INFO L93 Difference]: Finished difference Result 65 states and 89 transitions. [2020-10-15 00:09:31,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-15 00:09:31,632 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2020-10-15 00:09:31,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-15 00:09:31,640 INFO L225 Difference]: With dead ends: 65 [2020-10-15 00:09:31,640 INFO L226 Difference]: Without dead ends: 30 [2020-10-15 00:09:31,644 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-10-15 00:09:31,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-10-15 00:09:31,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-10-15 00:09:31,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-10-15 00:09:31,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-10-15 00:09:31,686 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2020-10-15 00:09:31,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-15 00:09:31,686 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-10-15 00:09:31,687 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-15 00:09:31,687 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-10-15 00:09:31,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-10-15 00:09:31,688 INFO L414 BasicCegarLoop]: Found error trace [2020-10-15 00:09:31,688 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-15 00:09:31,688 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-15 00:09:31,688 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-15 00:09:31,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-15 00:09:31,689 INFO L82 PathProgramCache]: Analyzing trace with hash -714610672, now seen corresponding path program 1 times [2020-10-15 00:09:31,689 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-15 00:09:31,690 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1643508730] [2020-10-15 00:09:31,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-15 00:09:31,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:31,710 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:31,729 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:31,746 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:32,001 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:32,002 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 27 [2020-10-15 00:09:32,002 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-15 00:09:32,002 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 297 [2020-10-15 00:09:32,002 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:32,003 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:32,003 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-15 00:09:32,003 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-15 00:09:32,003 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-10-15 00:09:32,004 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:32,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-15 00:09:32,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:32,034 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:32,037 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:32,037 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-15 00:09:32,037 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-15 00:09:32,037 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-15 00:09:32,038 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:32,038 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:32,038 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-15 00:09:32,038 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-15 00:09:32,039 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-15 00:09:32,039 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:32,042 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-15 00:09:32,042 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1643508730] [2020-10-15 00:09:32,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-15 00:09:32,043 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-15 00:09:32,043 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417034136] [2020-10-15 00:09:32,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-15 00:09:32,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-15 00:09:32,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-15 00:09:32,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-15 00:09:32,047 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-10-15 00:09:32,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-15 00:09:32,140 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-10-15 00:09:32,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-15 00:09:32,140 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-10-15 00:09:32,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-15 00:09:32,141 INFO L225 Difference]: With dead ends: 37 [2020-10-15 00:09:32,142 INFO L226 Difference]: Without dead ends: 26 [2020-10-15 00:09:32,143 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-10-15 00:09:32,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-10-15 00:09:32,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-10-15 00:09:32,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-10-15 00:09:32,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-10-15 00:09:32,150 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-10-15 00:09:32,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-15 00:09:32,151 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-10-15 00:09:32,151 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-15 00:09:32,151 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-10-15 00:09:32,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-15 00:09:32,152 INFO L414 BasicCegarLoop]: Found error trace [2020-10-15 00:09:32,152 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-15 00:09:32,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-15 00:09:32,153 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-15 00:09:32,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-15 00:09:32,154 INFO L82 PathProgramCache]: Analyzing trace with hash 483863630, now seen corresponding path program 1 times [2020-10-15 00:09:32,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-15 00:09:32,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1958014344] [2020-10-15 00:09:32,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-15 00:09:32,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:32,183 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:32,262 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:32,861 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:32,862 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 29 [2020-10-15 00:09:32,862 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-15 00:09:32,862 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 688 [2020-10-15 00:09:32,862 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:32,863 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:32,863 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-10-15 00:09:32,863 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-10-15 00:09:32,863 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 15 [2020-10-15 00:09:32,863 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:33,242 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 37 [2020-10-15 00:09:33,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-15 00:09:33,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:33,307 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:33,309 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:33,310 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-15 00:09:33,310 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-15 00:09:33,310 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-15 00:09:33,310 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:33,310 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:33,311 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-15 00:09:33,313 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-15 00:09:33,313 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-15 00:09:33,313 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-15 00:09:33,319 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-15 00:09:33,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1958014344] [2020-10-15 00:09:33,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-15 00:09:33,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-15 00:09:33,322 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953802129] [2020-10-15 00:09:33,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-15 00:09:33,323 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-15 00:09:33,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-15 00:09:33,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-10-15 00:09:33,325 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 12 states. [2020-10-15 00:09:33,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-15 00:09:33,889 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2020-10-15 00:09:33,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-10-15 00:09:33,890 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2020-10-15 00:09:33,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-15 00:09:33,892 INFO L225 Difference]: With dead ends: 49 [2020-10-15 00:09:33,892 INFO L226 Difference]: Without dead ends: 47 [2020-10-15 00:09:33,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2020-10-15 00:09:33,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-10-15 00:09:33,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 39. [2020-10-15 00:09:33,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-10-15 00:09:33,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-10-15 00:09:33,911 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-10-15 00:09:33,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-15 00:09:33,911 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-10-15 00:09:33,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-15 00:09:33,912 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-10-15 00:09:33,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-10-15 00:09:33,915 INFO L414 BasicCegarLoop]: Found error trace [2020-10-15 00:09:33,915 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-15 00:09:33,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-15 00:09:33,915 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-15 00:09:33,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-15 00:09:33,916 INFO L82 PathProgramCache]: Analyzing trace with hash 714881356, now seen corresponding path program 2 times [2020-10-15 00:09:33,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-15 00:09:33,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [85525108] [2020-10-15 00:09:33,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-15 00:09:33,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:33,953 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:34,040 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:34,424 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:34,425 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 31 [2020-10-15 00:09:34,425 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-15 00:09:34,425 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 479 [2020-10-15 00:09:34,426 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:34,426 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:34,426 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-15 00:09:34,427 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-10-15 00:09:34,428 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 10 [2020-10-15 00:09:34,433 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 6 [2020-10-15 00:09:34,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-15 00:09:34,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:34,501 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:34,503 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:34,503 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-15 00:09:34,503 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-15 00:09:34,503 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-15 00:09:34,504 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:34,504 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:34,504 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-15 00:09:34,504 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-15 00:09:34,505 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-15 00:09:34,505 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:34,510 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-15 00:09:34,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [85525108] [2020-10-15 00:09:34,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-15 00:09:34,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-15 00:09:34,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180971298] [2020-10-15 00:09:34,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-15 00:09:34,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-15 00:09:34,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-15 00:09:34,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-10-15 00:09:34,517 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 7 states. [2020-10-15 00:09:34,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-15 00:09:34,724 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-10-15 00:09:34,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-15 00:09:34,725 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-10-15 00:09:34,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-15 00:09:34,726 INFO L225 Difference]: With dead ends: 59 [2020-10-15 00:09:34,726 INFO L226 Difference]: Without dead ends: 48 [2020-10-15 00:09:34,727 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-10-15 00:09:34,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-10-15 00:09:34,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-10-15 00:09:34,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-10-15 00:09:34,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-10-15 00:09:34,743 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2020-10-15 00:09:34,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-15 00:09:34,744 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-10-15 00:09:34,745 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-15 00:09:34,745 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-10-15 00:09:34,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-15 00:09:34,747 INFO L414 BasicCegarLoop]: Found error trace [2020-10-15 00:09:34,747 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-15 00:09:34,747 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-15 00:09:34,748 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-15 00:09:34,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-15 00:09:34,748 INFO L82 PathProgramCache]: Analyzing trace with hash -163832182, now seen corresponding path program 3 times [2020-10-15 00:09:34,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-15 00:09:34,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1065048998] [2020-10-15 00:09:34,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-15 00:09:34,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:34,782 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:34,865 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:35,668 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:35,669 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 33 [2020-10-15 00:09:35,669 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-15 00:09:35,670 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 894 [2020-10-15 00:09:35,670 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:35,670 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:35,671 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 12 [2020-10-15 00:09:35,671 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-10-15 00:09:35,671 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 19 [2020-10-15 00:09:35,672 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:36,305 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 37 [2020-10-15 00:09:36,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-15 00:09:36,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:36,567 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:36,569 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:36,569 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-15 00:09:36,570 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-15 00:09:36,570 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-15 00:09:36,570 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:36,571 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:36,571 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-15 00:09:36,571 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-15 00:09:36,572 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-15 00:09:36,572 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:36,581 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-15 00:09:36,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1065048998] [2020-10-15 00:09:36,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-15 00:09:36,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-10-15 00:09:36,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567996294] [2020-10-15 00:09:36,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-10-15 00:09:36,584 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-15 00:09:36,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-10-15 00:09:36,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2020-10-15 00:09:36,585 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 14 states. [2020-10-15 00:09:37,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-15 00:09:37,568 INFO L93 Difference]: Finished difference Result 82 states and 91 transitions. [2020-10-15 00:09:37,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-10-15 00:09:37,569 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 25 [2020-10-15 00:09:37,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-15 00:09:37,572 INFO L225 Difference]: With dead ends: 82 [2020-10-15 00:09:37,572 INFO L226 Difference]: Without dead ends: 80 [2020-10-15 00:09:37,573 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=143, Invalid=559, Unknown=0, NotChecked=0, Total=702 [2020-10-15 00:09:37,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-10-15 00:09:37,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 46. [2020-10-15 00:09:37,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-10-15 00:09:37,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-10-15 00:09:37,585 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2020-10-15 00:09:37,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-15 00:09:37,585 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-10-15 00:09:37,585 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-10-15 00:09:37,585 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-10-15 00:09:37,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-10-15 00:09:37,586 INFO L414 BasicCegarLoop]: Found error trace [2020-10-15 00:09:37,586 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-15 00:09:37,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-15 00:09:37,587 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-15 00:09:37,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-15 00:09:37,587 INFO L82 PathProgramCache]: Analyzing trace with hash 1352039560, now seen corresponding path program 4 times [2020-10-15 00:09:37,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-15 00:09:37,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1294370981] [2020-10-15 00:09:37,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-15 00:09:37,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:37,608 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:37,688 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:38,237 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:38,238 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 35 [2020-10-15 00:09:38,238 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-15 00:09:38,238 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 636 [2020-10-15 00:09:38,239 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:38,239 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:38,239 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-10-15 00:09:38,239 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-10-15 00:09:38,240 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 14 [2020-10-15 00:09:38,240 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:38,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-15 00:09:38,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:38,286 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:38,288 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:38,288 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-15 00:09:38,289 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-15 00:09:38,289 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-15 00:09:38,289 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:38,289 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:38,290 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-15 00:09:38,290 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-15 00:09:38,290 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-15 00:09:38,290 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:38,293 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-15 00:09:38,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1294370981] [2020-10-15 00:09:38,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-15 00:09:38,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-15 00:09:38,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548179252] [2020-10-15 00:09:38,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-15 00:09:38,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-15 00:09:38,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-15 00:09:38,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-15 00:09:38,296 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 7 states. [2020-10-15 00:09:38,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-15 00:09:38,477 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2020-10-15 00:09:38,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-15 00:09:38,477 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 27 [2020-10-15 00:09:38,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-15 00:09:38,479 INFO L225 Difference]: With dead ends: 74 [2020-10-15 00:09:38,479 INFO L226 Difference]: Without dead ends: 63 [2020-10-15 00:09:38,479 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-10-15 00:09:38,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-10-15 00:09:38,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2020-10-15 00:09:38,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-10-15 00:09:38,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-10-15 00:09:38,489 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2020-10-15 00:09:38,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-15 00:09:38,489 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-10-15 00:09:38,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-15 00:09:38,489 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-10-15 00:09:38,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-15 00:09:38,490 INFO L414 BasicCegarLoop]: Found error trace [2020-10-15 00:09:38,490 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-15 00:09:38,491 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-15 00:09:38,491 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-15 00:09:38,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-15 00:09:38,491 INFO L82 PathProgramCache]: Analyzing trace with hash -1474600187, now seen corresponding path program 1 times [2020-10-15 00:09:38,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-15 00:09:38,492 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267662067] [2020-10-15 00:09:38,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-15 00:09:38,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:38,508 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:38,525 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:38,897 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:38,898 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 39 [2020-10-15 00:09:38,898 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-15 00:09:38,898 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 395 [2020-10-15 00:09:38,898 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:38,899 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:38,899 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-15 00:09:38,899 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 17 [2020-10-15 00:09:38,899 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 16 [2020-10-15 00:09:38,899 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:38,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-15 00:09:38,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:38,938 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:38,940 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:38,941 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-15 00:09:38,941 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-15 00:09:38,941 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-15 00:09:38,942 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:38,942 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:38,942 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-15 00:09:38,942 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-15 00:09:38,943 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-15 00:09:38,943 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:38,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-10-15 00:09:38,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:38,947 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:38,951 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:38,951 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-15 00:09:38,951 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-15 00:09:38,951 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-10-15 00:09:38,952 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:38,952 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:38,952 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-15 00:09:38,952 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-15 00:09:38,953 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-15 00:09:38,953 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:38,957 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-15 00:09:38,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267662067] [2020-10-15 00:09:38,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-15 00:09:38,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-15 00:09:38,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72921817] [2020-10-15 00:09:38,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-15 00:09:38,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-15 00:09:38,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-15 00:09:38,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-15 00:09:38,960 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 7 states. [2020-10-15 00:09:39,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-15 00:09:39,079 INFO L93 Difference]: Finished difference Result 68 states and 75 transitions. [2020-10-15 00:09:39,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-15 00:09:39,080 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 29 [2020-10-15 00:09:39,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-15 00:09:39,081 INFO L225 Difference]: With dead ends: 68 [2020-10-15 00:09:39,081 INFO L226 Difference]: Without dead ends: 52 [2020-10-15 00:09:39,082 INFO L675 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 [2020-10-15 00:09:39,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-10-15 00:09:39,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 47. [2020-10-15 00:09:39,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-10-15 00:09:39,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 52 transitions. [2020-10-15 00:09:39,108 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 52 transitions. Word has length 29 [2020-10-15 00:09:39,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-15 00:09:39,109 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 52 transitions. [2020-10-15 00:09:39,109 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-15 00:09:39,109 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 52 transitions. [2020-10-15 00:09:39,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-15 00:09:39,110 INFO L414 BasicCegarLoop]: Found error trace [2020-10-15 00:09:39,110 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-15 00:09:39,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-15 00:09:39,111 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-15 00:09:39,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-15 00:09:39,111 INFO L82 PathProgramCache]: Analyzing trace with hash -2035121466, now seen corresponding path program 5 times [2020-10-15 00:09:39,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-15 00:09:39,112 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2005914384] [2020-10-15 00:09:39,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-15 00:09:39,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:39,132 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:39,209 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:40,413 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:40,413 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 37 [2020-10-15 00:09:40,414 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-15 00:09:40,414 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1289 [2020-10-15 00:09:40,414 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:40,414 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:40,414 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 14 [2020-10-15 00:09:40,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-10-15 00:09:40,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 23 [2020-10-15 00:09:40,415 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:40,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-15 00:09:40,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:40,928 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:40,930 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:40,930 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-15 00:09:40,931 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-15 00:09:40,931 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-15 00:09:40,932 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:40,932 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:40,932 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-15 00:09:40,933 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-15 00:09:40,933 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-15 00:09:40,933 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:40,941 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-15 00:09:40,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2005914384] [2020-10-15 00:09:40,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-15 00:09:40,942 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-10-15 00:09:40,942 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994580457] [2020-10-15 00:09:40,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-10-15 00:09:40,943 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-15 00:09:40,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-10-15 00:09:40,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2020-10-15 00:09:40,944 INFO L87 Difference]: Start difference. First operand 47 states and 52 transitions. Second operand 16 states. [2020-10-15 00:09:42,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-15 00:09:42,204 INFO L93 Difference]: Finished difference Result 99 states and 111 transitions. [2020-10-15 00:09:42,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-10-15 00:09:42,204 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 29 [2020-10-15 00:09:42,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-15 00:09:42,206 INFO L225 Difference]: With dead ends: 99 [2020-10-15 00:09:42,206 INFO L226 Difference]: Without dead ends: 97 [2020-10-15 00:09:42,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=193, Invalid=799, Unknown=0, NotChecked=0, Total=992 [2020-10-15 00:09:42,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-10-15 00:09:42,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 52. [2020-10-15 00:09:42,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-10-15 00:09:42,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2020-10-15 00:09:42,230 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 29 [2020-10-15 00:09:42,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-15 00:09:42,231 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2020-10-15 00:09:42,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-10-15 00:09:42,231 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2020-10-15 00:09:42,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-10-15 00:09:42,233 INFO L414 BasicCegarLoop]: Found error trace [2020-10-15 00:09:42,233 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-15 00:09:42,233 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-10-15 00:09:42,233 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-15 00:09:42,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-15 00:09:42,234 INFO L82 PathProgramCache]: Analyzing trace with hash 2141778371, now seen corresponding path program 2 times [2020-10-15 00:09:42,234 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-15 00:09:42,238 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1074278435] [2020-10-15 00:09:42,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-15 00:09:42,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:42,259 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:42,276 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:42,725 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:42,726 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 41 [2020-10-15 00:09:42,726 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-15 00:09:42,726 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 473 [2020-10-15 00:09:42,726 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:42,727 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:42,727 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-15 00:09:42,727 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-10-15 00:09:42,727 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 22 [2020-10-15 00:09:42,727 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-15 00:09:42,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-15 00:09:42,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:42,774 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:42,775 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:42,776 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-15 00:09:42,776 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-15 00:09:42,776 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-15 00:09:42,776 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:42,776 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:42,777 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-15 00:09:42,777 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-15 00:09:42,778 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-15 00:09:42,778 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:42,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-10-15 00:09:42,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:42,785 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:42,788 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:42,788 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-15 00:09:42,788 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-15 00:09:42,788 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-10-15 00:09:42,789 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:42,789 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:42,789 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-15 00:09:42,789 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-15 00:09:42,790 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-15 00:09:42,790 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:42,792 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-15 00:09:42,793 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1074278435] [2020-10-15 00:09:42,794 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-15 00:09:42,794 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-15 00:09:42,794 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301458247] [2020-10-15 00:09:42,795 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-15 00:09:42,795 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-15 00:09:42,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-15 00:09:42,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-10-15 00:09:42,796 INFO L87 Difference]: Start difference. First operand 52 states and 58 transitions. Second operand 8 states. [2020-10-15 00:09:42,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-15 00:09:42,958 INFO L93 Difference]: Finished difference Result 84 states and 94 transitions. [2020-10-15 00:09:42,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-15 00:09:42,959 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-10-15 00:09:42,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-15 00:09:42,960 INFO L225 Difference]: With dead ends: 84 [2020-10-15 00:09:42,960 INFO L226 Difference]: Without dead ends: 62 [2020-10-15 00:09:42,961 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-10-15 00:09:42,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-10-15 00:09:42,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 52. [2020-10-15 00:09:42,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-10-15 00:09:42,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2020-10-15 00:09:42,974 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 31 [2020-10-15 00:09:42,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-15 00:09:42,974 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2020-10-15 00:09:42,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-15 00:09:42,974 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2020-10-15 00:09:42,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-10-15 00:09:42,980 INFO L414 BasicCegarLoop]: Found error trace [2020-10-15 00:09:42,980 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-15 00:09:42,981 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-10-15 00:09:42,981 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-15 00:09:42,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-15 00:09:42,981 INFO L82 PathProgramCache]: Analyzing trace with hash 1351725508, now seen corresponding path program 6 times [2020-10-15 00:09:42,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-15 00:09:42,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1872599101] [2020-10-15 00:09:42,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-15 00:09:42,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:43,000 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:43,138 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:43,878 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:43,879 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 39 [2020-10-15 00:09:43,879 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-15 00:09:43,879 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 884 [2020-10-15 00:09:43,881 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:43,881 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:43,881 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-10-15 00:09:43,882 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-10-15 00:09:43,882 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 18 [2020-10-15 00:09:43,882 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:43,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-15 00:09:43,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-15 00:09:43,949 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-15 00:09:43,952 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-15 00:09:43,953 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-15 00:09:43,953 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-15 00:09:43,953 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-15 00:09:43,954 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-15 00:09:43,954 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-15 00:09:43,955 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-15 00:09:43,955 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-15 00:09:43,955 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-15 00:09:43,956 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-15 00:09:43,959 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-15 00:09:43,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1872599101] [2020-10-15 00:09:43,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-15 00:09:43,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-10-15 00:09:43,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638160103] [2020-10-15 00:09:43,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-15 00:09:43,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-15 00:09:43,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-15 00:09:43,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-10-15 00:09:43,963 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 9 states. [2020-10-15 00:09:44,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-15 00:09:44,241 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2020-10-15 00:09:44,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-10-15 00:09:44,241 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-10-15 00:09:44,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-15 00:09:44,242 INFO L225 Difference]: With dead ends: 88 [2020-10-15 00:09:44,242 INFO L226 Difference]: Without dead ends: 77 [2020-10-15 00:09:44,243 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-10-15 00:09:44,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-10-15 00:09:44,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 54. [2020-10-15 00:09:44,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-10-15 00:09:44,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2020-10-15 00:09:44,259 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 31 [2020-10-15 00:09:44,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-15 00:09:44,260 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2020-10-15 00:09:44,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-15 00:09:44,261 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2020-10-15 00:09:44,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-15 00:09:44,264 INFO L414 BasicCegarLoop]: Found error trace [2020-10-15 00:09:44,264 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] [2020-10-15 00:09:44,264 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-10-15 00:09:44,264 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-15 00:09:44,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-15 00:09:44,265 INFO L82 PathProgramCache]: Analyzing trace with hash 1316510017, now seen corresponding path program 3 times [2020-10-15 00:09:44,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-15 00:09:44,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1634043356] [2020-10-15 00:09:44,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-15 00:09:44,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-15 00:09:44,282 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-15 00:09:44,282 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-10-15 00:09:44,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-10-15 00:09:44,308 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 15.10 12:09:44 BoogieIcfgContainer [2020-10-15 00:09:44,308 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-15 00:09:44,311 INFO L168 Benchmark]: Toolchain (without parser) took 14857.16 ms. Allocated memory was 148.4 MB in the beginning and 378.5 MB in the end (delta: 230.2 MB). Free memory was 104.0 MB in the beginning and 211.0 MB in the end (delta: -107.0 MB). Peak memory consumption was 123.2 MB. Max. memory is 7.1 GB. [2020-10-15 00:09:44,313 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 148.4 MB. Free memory was 122.9 MB in the beginning and 122.5 MB in the end (delta: 419.6 kB). Peak memory consumption was 419.6 kB. Max. memory is 7.1 GB. [2020-10-15 00:09:44,316 INFO L168 Benchmark]: CACSL2BoogieTranslator took 311.17 ms. Allocated memory is still 148.4 MB. Free memory was 104.0 MB in the beginning and 93.5 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-10-15 00:09:44,319 INFO L168 Benchmark]: Boogie Preprocessor took 121.07 ms. Allocated memory was 148.4 MB in the beginning and 205.0 MB in the end (delta: 56.6 MB). Free memory was 93.5 MB in the beginning and 182.3 MB in the end (delta: -88.8 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-10-15 00:09:44,319 INFO L168 Benchmark]: RCFGBuilder took 336.07 ms. Allocated memory is still 205.0 MB. Free memory was 182.3 MB in the beginning and 165.9 MB in the end (delta: 16.4 MB). Peak memory consumption was 16.4 MB. Max. memory is 7.1 GB. [2020-10-15 00:09:44,320 INFO L168 Benchmark]: TraceAbstraction took 14080.57 ms. Allocated memory was 205.0 MB in the beginning and 378.5 MB in the end (delta: 173.5 MB). Free memory was 165.9 MB in the beginning and 211.0 MB in the end (delta: -45.1 MB). Peak memory consumption was 128.5 MB. Max. memory is 7.1 GB. [2020-10-15 00:09:44,328 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 148.4 MB. Free memory was 122.9 MB in the beginning and 122.5 MB in the end (delta: 419.6 kB). Peak memory consumption was 419.6 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 311.17 ms. Allocated memory is still 148.4 MB. Free memory was 104.0 MB in the beginning and 93.5 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 121.07 ms. Allocated memory was 148.4 MB in the beginning and 205.0 MB in the end (delta: 56.6 MB). Free memory was 93.5 MB in the beginning and 182.3 MB in the end (delta: -88.8 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 336.07 ms. Allocated memory is still 205.0 MB. Free memory was 182.3 MB in the beginning and 165.9 MB in the end (delta: 16.4 MB). Peak memory consumption was 16.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 14080.57 ms. Allocated memory was 205.0 MB in the beginning and 378.5 MB in the end (delta: 173.5 MB). Free memory was 165.9 MB in the beginning and 211.0 MB in the end (delta: -45.1 MB). Peak memory consumption was 128.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int MAX = __VERIFIER_nondet_uint(); [L15] COND FALSE !(!(MAX > 0)) [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND FALSE !(i >= 0) [L32] j = MAX-1 [L33] i=0 [L33] COND TRUE i