/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/bitvector/interleave_bits.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-14 18:33:14,450 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-14 18:33:14,453 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-14 18:33:14,496 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-14 18:33:14,496 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-14 18:33:14,504 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-14 18:33:14,506 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-14 18:33:14,510 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-14 18:33:14,512 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-14 18:33:14,515 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-14 18:33:14,516 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-14 18:33:14,517 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-14 18:33:14,517 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-14 18:33:14,520 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-14 18:33:14,522 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-14 18:33:14,524 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-14 18:33:14,526 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-14 18:33:14,527 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-14 18:33:14,528 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-14 18:33:14,539 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-14 18:33:14,541 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-14 18:33:14,542 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-14 18:33:14,543 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-14 18:33:14,544 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-14 18:33:14,557 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-14 18:33:14,557 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-14 18:33:14,557 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-14 18:33:14,562 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-14 18:33:14,563 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-14 18:33:14,563 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-14 18:33:14,564 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-14 18:33:14,564 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-14 18:33:14,565 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-14 18:33:14,568 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-14 18:33:14,569 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-14 18:33:14,569 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-14 18:33:14,570 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-14 18:33:14,570 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-14 18:33:14,574 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-14 18:33:14,576 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-14 18:33:14,576 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-14 18:33:14,577 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 [2020-10-14 18:33:14,618 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-14 18:33:14,618 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-14 18:33:14,621 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-14 18:33:14,621 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-14 18:33:14,621 INFO L138 SettingsManager]: * Use SBE=true [2020-10-14 18:33:14,621 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-14 18:33:14,622 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-14 18:33:14,622 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-14 18:33:14,622 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-14 18:33:14,622 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-14 18:33:14,623 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-14 18:33:14,623 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-14 18:33:14,624 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-14 18:33:14,624 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-14 18:33:14,624 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-14 18:33:14,624 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-14 18:33:14,625 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-14 18:33:14,625 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-14 18:33:14,625 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-14 18:33:14,625 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-14 18:33:14,626 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-14 18:33:14,626 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-14 18:33:14,626 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-14 18:33:14,626 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-14 18:33:14,627 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-14 18:33:14,627 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-14 18:33:14,627 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-14 18:33:14,627 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-14 18:33:14,627 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-14 18:33:14,628 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; [2020-10-14 18:33:14,932 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-14 18:33:14,953 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-14 18:33:14,959 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-14 18:33:14,960 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-14 18:33:14,960 INFO L275 PluginConnector]: CDTParser initialized [2020-10-14 18:33:14,961 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector/interleave_bits.i [2020-10-14 18:33:15,040 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/915545d70/64c87a9fc20e49e3b0da87273ad6c732/FLAG233537aa3 [2020-10-14 18:33:15,557 INFO L306 CDTParser]: Found 1 translation units. [2020-10-14 18:33:15,558 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/bitvector/interleave_bits.i [2020-10-14 18:33:15,566 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/915545d70/64c87a9fc20e49e3b0da87273ad6c732/FLAG233537aa3 [2020-10-14 18:33:15,899 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/915545d70/64c87a9fc20e49e3b0da87273ad6c732 [2020-10-14 18:33:15,910 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-14 18:33:15,912 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-14 18:33:15,916 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-14 18:33:15,916 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-14 18:33:15,919 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-14 18:33:15,920 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 06:33:15" (1/1) ... [2020-10-14 18:33:15,925 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@582ac9d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 06:33:15, skipping insertion in model container [2020-10-14 18:33:15,925 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 06:33:15" (1/1) ... [2020-10-14 18:33:15,934 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-14 18:33:15,953 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-14 18:33:16,148 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-14 18:33:16,153 INFO L203 MainTranslator]: Completed pre-run [2020-10-14 18:33:16,176 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-14 18:33:16,192 INFO L208 MainTranslator]: Completed translation [2020-10-14 18:33:16,192 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 06:33:16 WrapperNode [2020-10-14 18:33:16,193 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-14 18:33:16,193 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-14 18:33:16,194 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-14 18:33:16,194 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-14 18:33:16,298 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 06:33:16" (1/1) ... [2020-10-14 18:33:16,298 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 06:33:16" (1/1) ... [2020-10-14 18:33:16,305 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 06:33:16" (1/1) ... [2020-10-14 18:33:16,305 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 06:33:16" (1/1) ... [2020-10-14 18:33:16,316 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 06:33:16" (1/1) ... [2020-10-14 18:33:16,321 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 06:33:16" (1/1) ... [2020-10-14 18:33:16,323 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 06:33:16" (1/1) ... [2020-10-14 18:33:16,325 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-14 18:33:16,325 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-14 18:33:16,325 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-14 18:33:16,325 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-14 18:33:16,326 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 06:33:16" (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 [2020-10-14 18:33:16,384 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-14 18:33:16,384 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-14 18:33:16,384 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-14 18:33:16,384 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-14 18:33:16,384 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-14 18:33:16,385 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_ushort [2020-10-14 18:33:16,385 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-14 18:33:16,385 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-14 18:33:16,385 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2020-10-14 18:33:16,385 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2020-10-14 18:33:16,385 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-14 18:33:16,386 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-14 18:33:16,386 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-14 18:33:16,566 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-14 18:33:16,566 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-14 18:33:16,570 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 06:33:16 BoogieIcfgContainer [2020-10-14 18:33:16,570 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-14 18:33:16,571 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-14 18:33:16,571 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-14 18:33:16,575 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-14 18:33:16,575 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 06:33:15" (1/3) ... [2020-10-14 18:33:16,576 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ccdadc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 06:33:16, skipping insertion in model container [2020-10-14 18:33:16,576 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 06:33:16" (2/3) ... [2020-10-14 18:33:16,576 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1ccdadc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 06:33:16, skipping insertion in model container [2020-10-14 18:33:16,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 06:33:16" (3/3) ... [2020-10-14 18:33:16,578 INFO L109 eAbstractionObserver]: Analyzing ICFG interleave_bits.i [2020-10-14 18:33:16,589 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-14 18:33:16,596 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-14 18:33:16,610 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-14 18:33:16,634 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-14 18:33:16,634 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-14 18:33:16,634 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-14 18:33:16,635 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-14 18:33:16,635 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-14 18:33:16,635 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-14 18:33:16,635 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-14 18:33:16,635 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-14 18:33:16,653 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2020-10-14 18:33:16,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-10-14 18:33:16,658 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:16,659 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:16,659 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:16,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:16,664 INFO L82 PathProgramCache]: Analyzing trace with hash -480905734, now seen corresponding path program 1 times [2020-10-14 18:33:16,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:16,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [562657882] [2020-10-14 18:33:16,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:16,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:16,791 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:16,873 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:16,873 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 19 [2020-10-14 18:33:16,874 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:16,874 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 99 [2020-10-14 18:33:16,876 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:16,876 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:16,877 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-14 18:33:16,877 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-14 18:33:16,877 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-14 18:33:16,877 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-14 18:33:16,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 18:33:16,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:16,968 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:16,971 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:16,972 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 18:33:16,972 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:16,973 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-10-14 18:33:16,973 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:16,973 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:16,974 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 18:33:16,974 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 18:33:16,974 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 18:33:16,975 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:16,980 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 18:33:16,981 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [562657882] [2020-10-14 18:33:16,983 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-14 18:33:16,984 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-14 18:33:16,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678656863] [2020-10-14 18:33:16,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-14 18:33:16,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 18:33:17,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-14 18:33:17,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-14 18:33:17,024 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 3 states. [2020-10-14 18:33:17,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 18:33:17,064 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2020-10-14 18:33:17,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-14 18:33:17,067 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-10-14 18:33:17,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 18:33:17,075 INFO L225 Difference]: With dead ends: 31 [2020-10-14 18:33:17,076 INFO L226 Difference]: Without dead ends: 13 [2020-10-14 18:33:17,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-14 18:33:17,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-10-14 18:33:17,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-10-14 18:33:17,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-10-14 18:33:17,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-10-14 18:33:17,126 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-10-14 18:33:17,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 18:33:17,127 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-10-14 18:33:17,127 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-14 18:33:17,127 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-10-14 18:33:17,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-10-14 18:33:17,128 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:17,128 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:17,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-14 18:33:17,129 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:17,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:17,130 INFO L82 PathProgramCache]: Analyzing trace with hash -436122843, now seen corresponding path program 1 times [2020-10-14 18:33:17,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:17,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [309284394] [2020-10-14 18:33:17,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:17,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:17,185 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:17,254 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:17,254 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 20 [2020-10-14 18:33:17,254 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:17,255 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 92 [2020-10-14 18:33:17,255 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:17,255 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:17,255 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-14 18:33:17,256 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-14 18:33:17,256 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 3 [2020-10-14 18:33:17,256 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:17,317 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 18:33:17,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:17,320 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:17,322 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:17,323 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 18:33:17,323 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:17,323 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-14 18:33:17,323 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:17,324 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:17,324 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 18:33:17,324 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 18:33:17,325 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 18:33:17,325 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:17,328 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 18:33:17,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [309284394] [2020-10-14 18:33:17,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-14 18:33:17,330 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-10-14 18:33:17,330 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966413335] [2020-10-14 18:33:17,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-14 18:33:17,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 18:33:17,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-14 18:33:17,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-14 18:33:17,333 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 4 states. [2020-10-14 18:33:17,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 18:33:17,355 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-10-14 18:33:17,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-14 18:33:17,356 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-10-14 18:33:17,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 18:33:17,357 INFO L225 Difference]: With dead ends: 20 [2020-10-14 18:33:17,358 INFO L226 Difference]: Without dead ends: 14 [2020-10-14 18:33:17,359 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-14 18:33:17,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-10-14 18:33:17,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-10-14 18:33:17,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-10-14 18:33:17,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-10-14 18:33:17,364 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-10-14 18:33:17,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 18:33:17,365 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-10-14 18:33:17,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-14 18:33:17,365 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-10-14 18:33:17,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-10-14 18:33:17,366 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:17,366 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:17,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-14 18:33:17,367 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:17,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:17,367 INFO L82 PathProgramCache]: Analyzing trace with hash 952146778, now seen corresponding path program 2 times [2020-10-14 18:33:17,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:17,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [917965647] [2020-10-14 18:33:17,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:17,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:17,391 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:17,538 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:17,539 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 21 [2020-10-14 18:33:17,539 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:17,539 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 155 [2020-10-14 18:33:17,539 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:17,540 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:17,540 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-14 18:33:17,542 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-14 18:33:17,542 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 4 [2020-10-14 18:33:17,543 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-14 18:33:17,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 18:33:17,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:17,673 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:17,678 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:17,679 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 18:33:17,682 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:17,682 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-10-14 18:33:17,683 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:17,683 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:17,683 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 18:33:17,684 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 18:33:17,684 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 18:33:17,684 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:17,687 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 18:33:17,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [917965647] [2020-10-14 18:33:17,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-14 18:33:17,693 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-14 18:33:17,693 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591400445] [2020-10-14 18:33:17,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-14 18:33:17,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 18:33:17,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-14 18:33:17,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-14 18:33:17,695 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 5 states. [2020-10-14 18:33:17,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 18:33:17,741 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-10-14 18:33:17,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-14 18:33:17,743 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-10-14 18:33:17,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 18:33:17,744 INFO L225 Difference]: With dead ends: 21 [2020-10-14 18:33:17,744 INFO L226 Difference]: Without dead ends: 15 [2020-10-14 18:33:17,745 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-14 18:33:17,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-10-14 18:33:17,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-10-14 18:33:17,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-10-14 18:33:17,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-10-14 18:33:17,757 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-10-14 18:33:17,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 18:33:17,757 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-10-14 18:33:17,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-14 18:33:17,758 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-10-14 18:33:17,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-10-14 18:33:17,760 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:17,760 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:17,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-14 18:33:17,761 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:17,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:17,762 INFO L82 PathProgramCache]: Analyzing trace with hash 1038832069, now seen corresponding path program 3 times [2020-10-14 18:33:17,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:17,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1701690847] [2020-10-14 18:33:17,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:17,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:17,804 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:17,922 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:17,922 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 22 [2020-10-14 18:33:17,923 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:17,925 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 134 [2020-10-14 18:33:17,926 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:17,926 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:17,926 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-14 18:33:17,927 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-14 18:33:17,927 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-10-14 18:33:17,947 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 21 [2020-10-14 18:33:18,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 18:33:18,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:18,037 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:18,039 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:18,039 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 18:33:18,039 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:18,039 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-14 18:33:18,040 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:18,040 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:18,040 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 18:33:18,040 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 18:33:18,041 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 18:33:18,041 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:18,043 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 18:33:18,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1701690847] [2020-10-14 18:33:18,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-14 18:33:18,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-14 18:33:18,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763041192] [2020-10-14 18:33:18,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-14 18:33:18,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 18:33:18,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-14 18:33:18,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-14 18:33:18,046 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 6 states. [2020-10-14 18:33:18,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 18:33:18,074 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-10-14 18:33:18,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-14 18:33:18,075 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-10-14 18:33:18,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 18:33:18,076 INFO L225 Difference]: With dead ends: 22 [2020-10-14 18:33:18,076 INFO L226 Difference]: Without dead ends: 16 [2020-10-14 18:33:18,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-14 18:33:18,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-10-14 18:33:18,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-10-14 18:33:18,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-10-14 18:33:18,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-10-14 18:33:18,082 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-10-14 18:33:18,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 18:33:18,082 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-10-14 18:33:18,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-14 18:33:18,082 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-10-14 18:33:18,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-14 18:33:18,083 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:18,083 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:18,084 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-14 18:33:18,084 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:18,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:18,084 INFO L82 PathProgramCache]: Analyzing trace with hash -568891206, now seen corresponding path program 4 times [2020-10-14 18:33:18,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:18,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [133372633] [2020-10-14 18:33:18,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:18,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:18,098 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:18,199 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:18,199 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 23 [2020-10-14 18:33:18,199 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:18,199 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 105 [2020-10-14 18:33:18,200 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:18,200 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:18,200 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-14 18:33:18,200 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-14 18:33:18,201 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-14 18:33:18,201 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:18,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 18:33:18,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:18,302 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:18,303 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:18,303 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 18:33:18,303 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:18,304 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-14 18:33:18,304 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:18,304 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:18,304 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 18:33:18,305 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 18:33:18,305 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 18:33:18,305 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:18,309 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 18:33:18,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [133372633] [2020-10-14 18:33:18,310 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-14 18:33:18,310 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-14 18:33:18,310 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515317399] [2020-10-14 18:33:18,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-14 18:33:18,313 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 18:33:18,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-14 18:33:18,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-10-14 18:33:18,315 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2020-10-14 18:33:18,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 18:33:18,354 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-10-14 18:33:18,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-14 18:33:18,355 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2020-10-14 18:33:18,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 18:33:18,356 INFO L225 Difference]: With dead ends: 23 [2020-10-14 18:33:18,356 INFO L226 Difference]: Without dead ends: 17 [2020-10-14 18:33:18,356 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-10-14 18:33:18,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-10-14 18:33:18,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-10-14 18:33:18,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-10-14 18:33:18,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-10-14 18:33:18,362 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-10-14 18:33:18,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 18:33:18,362 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-10-14 18:33:18,362 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-14 18:33:18,363 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-10-14 18:33:18,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-10-14 18:33:18,363 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:18,363 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:18,364 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-14 18:33:18,364 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:18,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:18,364 INFO L82 PathProgramCache]: Analyzing trace with hash 1131294821, now seen corresponding path program 5 times [2020-10-14 18:33:18,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:18,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [16141936] [2020-10-14 18:33:18,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:18,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:18,380 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:18,534 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:18,535 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 24 [2020-10-14 18:33:18,535 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:18,535 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 159 [2020-10-14 18:33:18,535 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:18,536 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:18,536 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-10-14 18:33:18,536 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-14 18:33:18,536 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-10-14 18:33:18,536 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:18,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 18:33:18,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:18,666 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:18,668 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:18,668 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 18:33:18,668 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:18,669 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-14 18:33:18,669 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:18,669 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:18,669 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 18:33:18,669 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 18:33:18,670 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 18:33:18,671 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-14 18:33:18,678 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 18:33:18,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [16141936] [2020-10-14 18:33:18,680 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-14 18:33:18,680 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-14 18:33:18,680 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723676974] [2020-10-14 18:33:18,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-14 18:33:18,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 18:33:18,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-14 18:33:18,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-10-14 18:33:18,684 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 8 states. [2020-10-14 18:33:18,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 18:33:18,747 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-10-14 18:33:18,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-14 18:33:18,749 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 16 [2020-10-14 18:33:18,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 18:33:18,750 INFO L225 Difference]: With dead ends: 24 [2020-10-14 18:33:18,750 INFO L226 Difference]: Without dead ends: 18 [2020-10-14 18:33:18,753 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-10-14 18:33:18,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-10-14 18:33:18,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-10-14 18:33:18,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-10-14 18:33:18,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-10-14 18:33:18,760 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-10-14 18:33:18,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 18:33:18,762 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-10-14 18:33:18,762 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-14 18:33:18,762 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-10-14 18:33:18,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-10-14 18:33:18,763 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:18,763 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:18,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-14 18:33:18,765 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:18,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:18,765 INFO L82 PathProgramCache]: Analyzing trace with hash -1997513190, now seen corresponding path program 6 times [2020-10-14 18:33:18,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:18,766 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1912222805] [2020-10-14 18:33:18,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:18,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:18,790 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:18,955 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:18,956 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 25 [2020-10-14 18:33:18,956 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:18,956 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 171 [2020-10-14 18:33:18,957 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:18,957 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:18,957 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-10-14 18:33:18,957 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-14 18:33:18,958 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-10-14 18:33:18,958 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:19,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 18:33:19,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:19,094 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:19,095 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:19,095 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 18:33:19,095 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:19,095 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-14 18:33:19,096 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:19,096 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:19,096 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 18:33:19,096 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 18:33:19,097 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 18:33:19,097 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:19,099 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 18:33:19,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1912222805] [2020-10-14 18:33:19,099 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-14 18:33:19,099 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-10-14 18:33:19,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203539223] [2020-10-14 18:33:19,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-14 18:33:19,100 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 18:33:19,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-14 18:33:19,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-10-14 18:33:19,101 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 9 states. [2020-10-14 18:33:19,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 18:33:19,147 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-10-14 18:33:19,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-14 18:33:19,148 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 17 [2020-10-14 18:33:19,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 18:33:19,149 INFO L225 Difference]: With dead ends: 25 [2020-10-14 18:33:19,149 INFO L226 Difference]: Without dead ends: 19 [2020-10-14 18:33:19,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-10-14 18:33:19,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-10-14 18:33:19,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-10-14 18:33:19,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-10-14 18:33:19,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-10-14 18:33:19,155 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-10-14 18:33:19,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 18:33:19,155 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-10-14 18:33:19,155 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-14 18:33:19,155 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-10-14 18:33:19,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-10-14 18:33:19,156 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:19,156 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:19,156 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-14 18:33:19,157 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:19,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:19,157 INFO L82 PathProgramCache]: Analyzing trace with hash -206313723, now seen corresponding path program 7 times [2020-10-14 18:33:19,157 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:19,158 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1560820470] [2020-10-14 18:33:19,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:19,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:19,171 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:19,282 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:19,282 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 26 [2020-10-14 18:33:19,282 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:19,282 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 115 [2020-10-14 18:33:19,283 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:19,283 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:19,283 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 9 [2020-10-14 18:33:19,283 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-14 18:33:19,284 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 9 [2020-10-14 18:33:19,284 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:19,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 18:33:19,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:19,401 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:19,402 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:19,402 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 18:33:19,402 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:19,402 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-14 18:33:19,403 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:19,403 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:19,403 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 18:33:19,403 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 18:33:19,403 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 18:33:19,404 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:19,405 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 18:33:19,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1560820470] [2020-10-14 18:33:19,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-14 18:33:19,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-10-14 18:33:19,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951110521] [2020-10-14 18:33:19,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-14 18:33:19,407 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 18:33:19,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-14 18:33:19,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-10-14 18:33:19,408 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2020-10-14 18:33:19,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 18:33:19,469 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-10-14 18:33:19,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-14 18:33:19,469 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2020-10-14 18:33:19,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 18:33:19,470 INFO L225 Difference]: With dead ends: 26 [2020-10-14 18:33:19,470 INFO L226 Difference]: Without dead ends: 20 [2020-10-14 18:33:19,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-10-14 18:33:19,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-10-14 18:33:19,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-10-14 18:33:19,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-10-14 18:33:19,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-10-14 18:33:19,476 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-10-14 18:33:19,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 18:33:19,477 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-10-14 18:33:19,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-14 18:33:19,477 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-10-14 18:33:19,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-10-14 18:33:19,477 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:19,478 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:19,478 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-10-14 18:33:19,478 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:19,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:19,479 INFO L82 PathProgramCache]: Analyzing trace with hash -513705094, now seen corresponding path program 8 times [2020-10-14 18:33:19,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:19,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1065951313] [2020-10-14 18:33:19,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:19,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:19,493 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:19,596 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:19,596 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 27 [2020-10-14 18:33:19,597 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:19,597 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 108 [2020-10-14 18:33:19,597 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:19,598 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:19,598 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-10-14 18:33:19,598 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-14 18:33:19,598 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 10 [2020-10-14 18:33:19,598 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:19,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 18:33:19,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:19,751 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:19,752 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:19,752 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 18:33:19,753 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:19,753 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-14 18:33:19,753 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:19,753 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:19,754 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 18:33:19,754 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 18:33:19,754 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 18:33:19,754 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:19,756 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 18:33:19,756 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1065951313] [2020-10-14 18:33:19,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-14 18:33:19,757 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-10-14 18:33:19,757 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524991814] [2020-10-14 18:33:19,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-14 18:33:19,758 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 18:33:19,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-14 18:33:19,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-10-14 18:33:19,759 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 11 states. [2020-10-14 18:33:19,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 18:33:19,827 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-10-14 18:33:19,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-14 18:33:19,828 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 19 [2020-10-14 18:33:19,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 18:33:19,829 INFO L225 Difference]: With dead ends: 27 [2020-10-14 18:33:19,829 INFO L226 Difference]: Without dead ends: 21 [2020-10-14 18:33:19,830 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-10-14 18:33:19,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-10-14 18:33:19,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-10-14 18:33:19,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-10-14 18:33:19,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-10-14 18:33:19,834 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-10-14 18:33:19,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 18:33:19,835 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-10-14 18:33:19,835 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-14 18:33:19,835 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-10-14 18:33:19,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-10-14 18:33:19,836 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:19,836 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:19,836 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-10-14 18:33:19,836 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:19,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:19,837 INFO L82 PathProgramCache]: Analyzing trace with hash -1452903003, now seen corresponding path program 9 times [2020-10-14 18:33:19,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:19,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [808427890] [2020-10-14 18:33:19,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:19,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:19,851 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:19,981 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:19,982 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 28 [2020-10-14 18:33:19,982 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:19,982 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 135 [2020-10-14 18:33:19,982 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:19,982 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:19,983 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 11 [2020-10-14 18:33:19,983 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-14 18:33:19,983 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 11 [2020-10-14 18:33:19,983 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:20,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 18:33:20,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:20,126 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:20,127 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:20,127 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 18:33:20,127 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:20,128 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-14 18:33:20,128 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:20,128 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:20,128 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 18:33:20,129 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 18:33:20,129 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 18:33:20,129 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-14 18:33:20,131 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 18:33:20,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [808427890] [2020-10-14 18:33:20,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-14 18:33:20,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-14 18:33:20,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492354441] [2020-10-14 18:33:20,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-14 18:33:20,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 18:33:20,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-14 18:33:20,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-10-14 18:33:20,133 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 12 states. [2020-10-14 18:33:20,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 18:33:20,212 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-10-14 18:33:20,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-14 18:33:20,213 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 20 [2020-10-14 18:33:20,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 18:33:20,214 INFO L225 Difference]: With dead ends: 28 [2020-10-14 18:33:20,214 INFO L226 Difference]: Without dead ends: 22 [2020-10-14 18:33:20,214 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-10-14 18:33:20,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-10-14 18:33:20,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-10-14 18:33:20,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-10-14 18:33:20,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-10-14 18:33:20,219 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-10-14 18:33:20,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 18:33:20,220 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-10-14 18:33:20,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-14 18:33:20,220 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-10-14 18:33:20,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-14 18:33:20,221 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:20,221 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:20,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-10-14 18:33:20,221 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:20,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:20,222 INFO L82 PathProgramCache]: Analyzing trace with hash -503267110, now seen corresponding path program 10 times [2020-10-14 18:33:20,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:20,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1764472103] [2020-10-14 18:33:20,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:20,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:20,237 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:20,428 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:20,428 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 29 [2020-10-14 18:33:20,428 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:20,428 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 195 [2020-10-14 18:33:20,429 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:20,429 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:20,429 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 12 [2020-10-14 18:33:20,429 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-14 18:33:20,429 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 12 [2020-10-14 18:33:20,429 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-14 18:33:20,635 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 18:33:20,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:20,637 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:20,637 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:20,638 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 18:33:20,638 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:20,638 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-14 18:33:20,639 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:20,639 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:20,639 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 18:33:20,640 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 18:33:20,640 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 18:33:20,640 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:20,642 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 18:33:20,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1764472103] [2020-10-14 18:33:20,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-14 18:33:20,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-10-14 18:33:20,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276751889] [2020-10-14 18:33:20,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-14 18:33:20,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 18:33:20,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-14 18:33:20,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-10-14 18:33:20,645 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 13 states. [2020-10-14 18:33:20,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 18:33:20,750 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-10-14 18:33:20,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-14 18:33:20,751 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2020-10-14 18:33:20,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 18:33:20,752 INFO L225 Difference]: With dead ends: 29 [2020-10-14 18:33:20,752 INFO L226 Difference]: Without dead ends: 23 [2020-10-14 18:33:20,753 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-10-14 18:33:20,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-10-14 18:33:20,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-10-14 18:33:20,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-10-14 18:33:20,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-10-14 18:33:20,757 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-10-14 18:33:20,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 18:33:20,758 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-10-14 18:33:20,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-14 18:33:20,758 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-10-14 18:33:20,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-14 18:33:20,759 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:20,759 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:20,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-10-14 18:33:20,759 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:20,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:20,760 INFO L82 PathProgramCache]: Analyzing trace with hash -1129325499, now seen corresponding path program 11 times [2020-10-14 18:33:20,760 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:20,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [113781468] [2020-10-14 18:33:20,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:20,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:20,775 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:20,968 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:20,968 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 30 [2020-10-14 18:33:20,969 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:20,969 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 198 [2020-10-14 18:33:20,969 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:20,969 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:20,970 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 13 [2020-10-14 18:33:20,970 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-14 18:33:20,970 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 13 [2020-10-14 18:33:20,970 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:21,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 18:33:21,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:21,187 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:21,188 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:21,188 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 18:33:21,189 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:21,189 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-14 18:33:21,189 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:21,189 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:21,190 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 18:33:21,190 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 18:33:21,190 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 18:33:21,190 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:21,193 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 18:33:21,193 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [113781468] [2020-10-14 18:33:21,193 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-14 18:33:21,193 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-10-14 18:33:21,194 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428875759] [2020-10-14 18:33:21,194 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-10-14 18:33:21,194 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 18:33:21,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-10-14 18:33:21,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-10-14 18:33:21,195 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 14 states. [2020-10-14 18:33:21,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 18:33:21,314 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-10-14 18:33:21,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-10-14 18:33:21,315 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 22 [2020-10-14 18:33:21,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 18:33:21,316 INFO L225 Difference]: With dead ends: 30 [2020-10-14 18:33:21,316 INFO L226 Difference]: Without dead ends: 24 [2020-10-14 18:33:21,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-10-14 18:33:21,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-10-14 18:33:21,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-10-14 18:33:21,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-10-14 18:33:21,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-10-14 18:33:21,321 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-10-14 18:33:21,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 18:33:21,322 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-10-14 18:33:21,322 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-10-14 18:33:21,322 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-10-14 18:33:21,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-10-14 18:33:21,323 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:21,323 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:21,323 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-10-14 18:33:21,323 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:21,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:21,324 INFO L82 PathProgramCache]: Analyzing trace with hash 937700922, now seen corresponding path program 12 times [2020-10-14 18:33:21,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:21,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257252018] [2020-10-14 18:33:21,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:21,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:21,341 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:21,592 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:21,592 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 31 [2020-10-14 18:33:21,592 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:21,593 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 258 [2020-10-14 18:33:21,593 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:21,593 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:21,593 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 14 [2020-10-14 18:33:21,593 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-14 18:33:21,594 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 14 [2020-10-14 18:33:21,594 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:21,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 18:33:21,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:21,833 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:21,834 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:21,834 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 18:33:21,835 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:21,835 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-14 18:33:21,835 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:21,835 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:21,835 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 18:33:21,836 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 18:33:21,836 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 18:33:21,836 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:21,838 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 18:33:21,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257252018] [2020-10-14 18:33:21,839 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-14 18:33:21,839 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-10-14 18:33:21,840 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476233023] [2020-10-14 18:33:21,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-10-14 18:33:21,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 18:33:21,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-10-14 18:33:21,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-10-14 18:33:21,841 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 15 states. [2020-10-14 18:33:21,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 18:33:21,998 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-10-14 18:33:21,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-10-14 18:33:21,999 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 23 [2020-10-14 18:33:21,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 18:33:21,999 INFO L225 Difference]: With dead ends: 31 [2020-10-14 18:33:21,999 INFO L226 Difference]: Without dead ends: 25 [2020-10-14 18:33:22,000 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-10-14 18:33:22,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-10-14 18:33:22,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-10-14 18:33:22,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-10-14 18:33:22,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-10-14 18:33:22,005 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-10-14 18:33:22,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 18:33:22,005 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-10-14 18:33:22,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-10-14 18:33:22,005 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-10-14 18:33:22,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-14 18:33:22,006 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:22,006 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:22,007 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-10-14 18:33:22,007 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:22,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:22,007 INFO L82 PathProgramCache]: Analyzing trace with hash 591010533, now seen corresponding path program 13 times [2020-10-14 18:33:22,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:22,008 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [986249143] [2020-10-14 18:33:22,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:22,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:22,024 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:22,306 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:22,307 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 32 [2020-10-14 18:33:22,307 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:22,307 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 289 [2020-10-14 18:33:22,307 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:22,308 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:22,308 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 15 [2020-10-14 18:33:22,308 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-14 18:33:22,308 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 15 [2020-10-14 18:33:22,308 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:22,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 18:33:22,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:22,537 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:22,537 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:22,538 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 18:33:22,538 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:22,538 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-14 18:33:22,538 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:22,539 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:22,539 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 18:33:22,539 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 18:33:22,539 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 18:33:22,539 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:22,542 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 18:33:22,542 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [986249143] [2020-10-14 18:33:22,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-14 18:33:22,542 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-10-14 18:33:22,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317120720] [2020-10-14 18:33:22,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-10-14 18:33:22,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 18:33:22,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-10-14 18:33:22,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-10-14 18:33:22,544 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 16 states. [2020-10-14 18:33:22,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 18:33:22,680 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-10-14 18:33:22,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-10-14 18:33:22,680 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 24 [2020-10-14 18:33:22,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 18:33:22,681 INFO L225 Difference]: With dead ends: 32 [2020-10-14 18:33:22,682 INFO L226 Difference]: Without dead ends: 26 [2020-10-14 18:33:22,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-10-14 18:33:22,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-10-14 18:33:22,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-10-14 18:33:22,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-10-14 18:33:22,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-10-14 18:33:22,687 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-10-14 18:33:22,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 18:33:22,688 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-10-14 18:33:22,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-10-14 18:33:22,688 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-10-14 18:33:22,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-14 18:33:22,689 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:22,689 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:22,689 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-10-14 18:33:22,689 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:22,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:22,690 INFO L82 PathProgramCache]: Analyzing trace with hash -1566456934, now seen corresponding path program 14 times [2020-10-14 18:33:22,690 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:22,690 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [457659342] [2020-10-14 18:33:22,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:22,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:22,713 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:23,040 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:23,040 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 33 [2020-10-14 18:33:23,041 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:23,041 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 334 [2020-10-14 18:33:23,041 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:23,042 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:23,042 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 16 [2020-10-14 18:33:23,042 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-14 18:33:23,042 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 16 [2020-10-14 18:33:23,043 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:23,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 18:33:23,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:23,300 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:23,301 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:23,301 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 18:33:23,301 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:23,302 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-14 18:33:23,302 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:23,302 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:23,302 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 18:33:23,303 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 18:33:23,303 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 18:33:23,303 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:23,306 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 18:33:23,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [457659342] [2020-10-14 18:33:23,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-14 18:33:23,307 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-10-14 18:33:23,307 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471873861] [2020-10-14 18:33:23,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-10-14 18:33:23,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 18:33:23,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-10-14 18:33:23,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-10-14 18:33:23,310 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 17 states. [2020-10-14 18:33:23,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 18:33:23,481 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-10-14 18:33:23,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-10-14 18:33:23,483 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 25 [2020-10-14 18:33:23,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 18:33:23,483 INFO L225 Difference]: With dead ends: 33 [2020-10-14 18:33:23,484 INFO L226 Difference]: Without dead ends: 27 [2020-10-14 18:33:23,486 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-10-14 18:33:23,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-10-14 18:33:23,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-10-14 18:33:23,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-10-14 18:33:23,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-10-14 18:33:23,492 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-10-14 18:33:23,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 18:33:23,492 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-10-14 18:33:23,492 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-10-14 18:33:23,492 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-10-14 18:33:23,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-10-14 18:33:23,494 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:23,494 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:23,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-10-14 18:33:23,494 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:23,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:23,495 INFO L82 PathProgramCache]: Analyzing trace with hash 271528325, now seen corresponding path program 15 times [2020-10-14 18:33:23,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:23,495 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2051756497] [2020-10-14 18:33:23,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:23,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:23,514 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:23,855 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:23,856 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 34 [2020-10-14 18:33:23,856 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:23,856 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 348 [2020-10-14 18:33:23,857 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:23,857 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:23,857 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 17 [2020-10-14 18:33:23,858 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-14 18:33:23,858 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 17 [2020-10-14 18:33:23,858 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-14 18:33:24,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-14 18:33:24,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-14 18:33:24,153 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-14 18:33:24,154 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-14 18:33:24,154 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-14 18:33:24,154 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-14 18:33:24,154 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-14 18:33:24,155 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-10-14 18:33:24,155 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.2 [2020-10-14 18:33:24,155 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-14 18:33:24,155 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-14 18:33:24,155 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-14 18:33:24,156 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-14 18:33:24,158 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-14 18:33:24,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2051756497] [2020-10-14 18:33:24,160 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-14 18:33:24,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-10-14 18:33:24,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734905034] [2020-10-14 18:33:24,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-10-14 18:33:24,161 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-14 18:33:24,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-10-14 18:33:24,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-10-14 18:33:24,162 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 18 states. [2020-10-14 18:33:24,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-14 18:33:24,336 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-10-14 18:33:24,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-10-14 18:33:24,338 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 26 [2020-10-14 18:33:24,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-14 18:33:24,339 INFO L225 Difference]: With dead ends: 34 [2020-10-14 18:33:24,339 INFO L226 Difference]: Without dead ends: 28 [2020-10-14 18:33:24,340 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-10-14 18:33:24,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-10-14 18:33:24,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-10-14 18:33:24,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-10-14 18:33:24,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-10-14 18:33:24,344 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-10-14 18:33:24,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-14 18:33:24,345 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-10-14 18:33:24,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-10-14 18:33:24,345 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-10-14 18:33:24,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-10-14 18:33:24,345 INFO L414 BasicCegarLoop]: Found error trace [2020-10-14 18:33:24,346 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-14 18:33:24,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-10-14 18:33:24,346 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-14 18:33:24,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-14 18:33:24,346 INFO L82 PathProgramCache]: Analyzing trace with hash 1414496506, now seen corresponding path program 16 times [2020-10-14 18:33:24,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-14 18:33:24,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1196299199] [2020-10-14 18:33:24,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-14 18:33:24,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-14 18:33:24,357 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-14 18:33:24,357 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-10-14 18:33:24,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-10-14 18:33:24,380 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 14.10 06:33:24 BoogieIcfgContainer [2020-10-14 18:33:24,380 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-14 18:33:24,383 INFO L168 Benchmark]: Toolchain (without parser) took 8470.65 ms. Allocated memory was 147.8 MB in the beginning and 316.7 MB in the end (delta: 168.8 MB). Free memory was 103.0 MB in the beginning and 149.8 MB in the end (delta: -46.8 MB). Peak memory consumption was 122.0 MB. Max. memory is 7.1 GB. [2020-10-14 18:33:24,384 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 147.8 MB. Free memory was 121.1 MB in the beginning and 120.7 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. [2020-10-14 18:33:24,385 INFO L168 Benchmark]: CACSL2BoogieTranslator took 277.48 ms. Allocated memory is still 147.8 MB. Free memory was 102.6 MB in the beginning and 92.1 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-10-14 18:33:24,386 INFO L168 Benchmark]: Boogie Preprocessor took 131.49 ms. Allocated memory was 147.8 MB in the beginning and 204.5 MB in the end (delta: 56.6 MB). Free memory was 92.1 MB in the beginning and 182.1 MB in the end (delta: -89.9 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-10-14 18:33:24,386 INFO L168 Benchmark]: RCFGBuilder took 244.92 ms. Allocated memory is still 204.5 MB. Free memory was 182.1 MB in the beginning and 169.9 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2020-10-14 18:33:24,387 INFO L168 Benchmark]: TraceAbstraction took 7809.07 ms. Allocated memory was 204.5 MB in the beginning and 316.7 MB in the end (delta: 112.2 MB). Free memory was 169.9 MB in the beginning and 149.8 MB in the end (delta: 20.1 MB). Peak memory consumption was 132.3 MB. Max. memory is 7.1 GB. [2020-10-14 18:33:24,390 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 147.8 MB. Free memory was 121.1 MB in the beginning and 120.7 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 277.48 ms. Allocated memory is still 147.8 MB. Free memory was 102.6 MB in the beginning and 92.1 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 131.49 ms. Allocated memory was 147.8 MB in the beginning and 204.5 MB in the end (delta: 56.6 MB). Free memory was 92.1 MB in the beginning and 182.1 MB in the end (delta: -89.9 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 244.92 ms. Allocated memory is still 204.5 MB. Free memory was 182.1 MB in the beginning and 169.9 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7809.07 ms. Allocated memory was 204.5 MB in the beginning and 316.7 MB in the end (delta: 112.2 MB). Free memory was 169.9 MB in the beginning and 149.8 MB in the end (delta: 20.1 MB). Peak memory consumption was 132.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 6]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of bitwiseOr at line 45, overapproximation of bitwiseAnd at line 36. Possible FailurePath: [L23] unsigned short x = __VERIFIER_nondet_ushort(); [L24] unsigned short y = __VERIFIER_nondet_ushort(); [L25] unsigned int xx; [L26] unsigned int yy; [L27] unsigned int zz; [L28] unsigned int z = 0; [L29] unsigned int i = 0; [L30] COND TRUE i < sizeof(x) * 8 [L31] z |= ((x & (1U << i)) << i) | ((y & (1U << i)) << (i + 1)) [L32] i += 1U [L30] COND TRUE i < sizeof(x) * 8 [L31] z |= ((x & (1U << i)) << i) | ((y & (1U << i)) << (i + 1)) [L32] i += 1U [L30] COND TRUE i < sizeof(x) * 8 [L31] z |= ((x & (1U << i)) << i) | ((y & (1U << i)) << (i + 1)) [L32] i += 1U [L30] COND TRUE i < sizeof(x) * 8 [L31] z |= ((x & (1U << i)) << i) | ((y & (1U << i)) << (i + 1)) [L32] i += 1U [L30] COND TRUE i < sizeof(x) * 8 [L31] z |= ((x & (1U << i)) << i) | ((y & (1U << i)) << (i + 1)) [L32] i += 1U [L30] COND TRUE i < sizeof(x) * 8 [L31] z |= ((x & (1U << i)) << i) | ((y & (1U << i)) << (i + 1)) [L32] i += 1U [L30] COND TRUE i < sizeof(x) * 8 [L31] z |= ((x & (1U << i)) << i) | ((y & (1U << i)) << (i + 1)) [L32] i += 1U [L30] COND TRUE i < sizeof(x) * 8 [L31] z |= ((x & (1U << i)) << i) | ((y & (1U << i)) << (i + 1)) [L32] i += 1U [L30] COND TRUE i < sizeof(x) * 8 [L31] z |= ((x & (1U << i)) << i) | ((y & (1U << i)) << (i + 1)) [L32] i += 1U [L30] COND TRUE i < sizeof(x) * 8 [L31] z |= ((x & (1U << i)) << i) | ((y & (1U << i)) << (i + 1)) [L32] i += 1U [L30] COND TRUE i < sizeof(x) * 8 [L31] z |= ((x & (1U << i)) << i) | ((y & (1U << i)) << (i + 1)) [L32] i += 1U [L30] COND TRUE i < sizeof(x) * 8 [L31] z |= ((x & (1U << i)) << i) | ((y & (1U << i)) << (i + 1)) [L32] i += 1U [L30] COND TRUE i < sizeof(x) * 8 [L31] z |= ((x & (1U << i)) << i) | ((y & (1U << i)) << (i + 1)) [L32] i += 1U [L30] COND TRUE i < sizeof(x) * 8 [L31] z |= ((x & (1U << i)) << i) | ((y & (1U << i)) << (i + 1)) [L32] i += 1U [L30] COND TRUE i < sizeof(x) * 8 [L31] z |= ((x & (1U << i)) << i) | ((y & (1U << i)) << (i + 1)) [L32] i += 1U [L30] COND TRUE i < sizeof(x) * 8 [L31] z |= ((x & (1U << i)) << i) | ((y & (1U << i)) << (i + 1)) [L32] i += 1U [L30] COND FALSE !(i < sizeof(x) * 8) [L34] xx = x [L35] yy = y [L36] xx = (xx | (xx << 8u)) & 16711935U [L37] xx = (xx | (xx << 4u)) & 252645135U [L38] xx = (xx | (xx << 2u)) & 858993459U [L39] xx = (xx | (xx << 1u)) & 1431655765U [L40] yy = (yy | (yy << 8u)) & 16711935U [L41] yy = (yy | (yy << 4u)) & 252645135U [L42] yy = (yy | (yy << 2u)) & 858993459U [L43] yy = (yy | (yy << 1u)) & 1431655765U [L45] zz = xx | (yy << 1U) [L47] CALL __VERIFIER_assert(z == zz) [L5] COND TRUE !(cond) [L6] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 18 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 7.7s, OverallIterations: 17, TraceHistogramMax: 16, AutomataDifference: 1.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 182 SDtfs, 0 SDslu, 798 SDs, 0 SdLazy, 1465 SolverSat, 120 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 200 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=28occurred in iteration=16, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 16 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 5.6s InterpolantComputationTime, 323 NumberOfCodeBlocks, 323 NumberOfCodeBlocksAsserted, 17 NumberOfCheckSat, 280 ConstructedInterpolants, 0 QuantifiedInterpolants, 22680 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 16 InterpolantComputations, 1 PerfectInterpolantSequences, 0/680 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...