./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/array-examples/relax-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version ff03de63 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/array-examples/relax-2.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d53812dd1177b266d0f37d9b3339dda1620cf3a3734db2ec7312de8297126685 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 09:43:15,702 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 09:43:15,703 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 09:43:15,761 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 09:43:15,763 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 09:43:15,767 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 09:43:15,769 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 09:43:15,772 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 09:43:15,773 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 09:43:15,778 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 09:43:15,779 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 09:43:15,780 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 09:43:15,780 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 09:43:15,782 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 09:43:15,783 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 09:43:15,785 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 09:43:15,786 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 09:43:15,786 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 09:43:15,790 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 09:43:15,796 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 09:43:15,797 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 09:43:15,798 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 09:43:15,799 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 09:43:15,799 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 09:43:15,801 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 09:43:15,801 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 09:43:15,802 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 09:43:15,803 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 09:43:15,803 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 09:43:15,804 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 09:43:15,804 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 09:43:15,805 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 09:43:15,806 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 09:43:15,807 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 09:43:15,808 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 09:43:15,808 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 09:43:15,809 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 09:43:15,809 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 09:43:15,809 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 09:43:15,810 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 09:43:15,810 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 09:43:15,811 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-21 09:43:15,837 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 09:43:15,837 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 09:43:15,838 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 09:43:15,838 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 09:43:15,839 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 09:43:15,839 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 09:43:15,839 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 09:43:15,839 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 09:43:15,840 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 09:43:15,840 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 09:43:15,840 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 09:43:15,841 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 09:43:15,841 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 09:43:15,841 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 09:43:15,841 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-21 09:43:15,841 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 09:43:15,841 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-21 09:43:15,841 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 09:43:15,842 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-21 09:43:15,842 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 09:43:15,842 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-21 09:43:15,842 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 09:43:15,842 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 09:43:15,842 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 09:43:15,843 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 09:43:15,843 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 09:43:15,843 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 09:43:15,843 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-21 09:43:15,843 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 09:43:15,843 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 09:43:15,844 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-21 09:43:15,844 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-21 09:43:15,844 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-21 09:43:15,844 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 09:43:15,844 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d53812dd1177b266d0f37d9b3339dda1620cf3a3734db2ec7312de8297126685 [2021-12-21 09:43:16,050 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 09:43:16,072 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 09:43:16,073 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 09:43:16,074 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 09:43:16,075 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 09:43:16,075 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/relax-2.i [2021-12-21 09:43:16,125 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/915fc8d81/dbf77610df6247b7879095e60f0d6b07/FLAGfeccc0c32 [2021-12-21 09:43:16,537 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 09:43:16,537 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/relax-2.i [2021-12-21 09:43:16,550 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/915fc8d81/dbf77610df6247b7879095e60f0d6b07/FLAGfeccc0c32 [2021-12-21 09:43:16,891 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/915fc8d81/dbf77610df6247b7879095e60f0d6b07 [2021-12-21 09:43:16,892 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 09:43:16,893 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 09:43:16,895 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 09:43:16,895 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 09:43:16,897 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 09:43:16,899 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:43:16" (1/1) ... [2021-12-21 09:43:16,900 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f565cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:16, skipping insertion in model container [2021-12-21 09:43:16,900 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:43:16" (1/1) ... [2021-12-21 09:43:16,904 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 09:43:16,926 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 09:43:17,043 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/relax-2.i[980,993] [2021-12-21 09:43:17,136 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 09:43:17,143 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 09:43:17,153 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/relax-2.i[980,993] [2021-12-21 09:43:17,199 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 09:43:17,217 INFO L208 MainTranslator]: Completed translation [2021-12-21 09:43:17,218 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:17 WrapperNode [2021-12-21 09:43:17,218 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 09:43:17,219 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 09:43:17,219 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 09:43:17,219 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 09:43:17,224 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:17" (1/1) ... [2021-12-21 09:43:17,247 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:17" (1/1) ... [2021-12-21 09:43:17,276 INFO L137 Inliner]: procedures = 120, calls = 26, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 135 [2021-12-21 09:43:17,277 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 09:43:17,277 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 09:43:17,277 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 09:43:17,278 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 09:43:17,283 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:17" (1/1) ... [2021-12-21 09:43:17,283 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:17" (1/1) ... [2021-12-21 09:43:17,295 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:17" (1/1) ... [2021-12-21 09:43:17,296 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:17" (1/1) ... [2021-12-21 09:43:17,303 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:17" (1/1) ... [2021-12-21 09:43:17,306 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:17" (1/1) ... [2021-12-21 09:43:17,307 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:17" (1/1) ... [2021-12-21 09:43:17,308 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 09:43:17,309 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 09:43:17,309 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 09:43:17,309 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 09:43:17,311 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:17" (1/1) ... [2021-12-21 09:43:17,331 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 09:43:17,337 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:17,346 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-21 09:43:17,359 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-21 09:43:17,376 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-21 09:43:17,376 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-21 09:43:17,376 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-21 09:43:17,376 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-21 09:43:17,377 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-12-21 09:43:17,377 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-12-21 09:43:17,377 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-21 09:43:17,377 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 09:43:17,377 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-21 09:43:17,377 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 09:43:17,377 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 09:43:17,474 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 09:43:17,475 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 09:43:17,677 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 09:43:17,682 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 09:43:17,684 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-12-21 09:43:17,686 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:43:17 BoogieIcfgContainer [2021-12-21 09:43:17,686 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 09:43:17,688 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 09:43:17,688 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 09:43:17,690 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 09:43:17,691 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:43:16" (1/3) ... [2021-12-21 09:43:17,692 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64863177 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:43:17, skipping insertion in model container [2021-12-21 09:43:17,692 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:43:17" (2/3) ... [2021-12-21 09:43:17,693 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@64863177 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:43:17, skipping insertion in model container [2021-12-21 09:43:17,693 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:43:17" (3/3) ... [2021-12-21 09:43:17,695 INFO L111 eAbstractionObserver]: Analyzing ICFG relax-2.i [2021-12-21 09:43:17,699 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 09:43:17,699 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-21 09:43:17,744 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 09:43:17,750 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-21 09:43:17,751 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-21 09:43:17,776 INFO L276 IsEmpty]: Start isEmpty. Operand has 51 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 44 states have internal predecessors, (67), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 09:43:17,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-21 09:43:17,780 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:17,780 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:17,781 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:17,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:17,786 INFO L85 PathProgramCache]: Analyzing trace with hash 229348008, now seen corresponding path program 1 times [2021-12-21 09:43:17,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:17,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1497592608] [2021-12-21 09:43:17,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:17,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:17,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:17,987 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 09:43:17,987 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:17,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1497592608] [2021-12-21 09:43:17,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1497592608] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 09:43:17,988 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 09:43:17,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-21 09:43:17,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895019351] [2021-12-21 09:43:17,990 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 09:43:17,992 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 09:43:17,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:18,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 09:43:18,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 09:43:18,016 INFO L87 Difference]: Start difference. First operand has 51 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 44 states have internal predecessors, (67), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:18,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:18,052 INFO L93 Difference]: Finished difference Result 110 states and 172 transitions. [2021-12-21 09:43:18,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 09:43:18,054 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-12-21 09:43:18,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:18,059 INFO L225 Difference]: With dead ends: 110 [2021-12-21 09:43:18,059 INFO L226 Difference]: Without dead ends: 55 [2021-12-21 09:43:18,061 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-21 09:43:18,064 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 13 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:18,064 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 200 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 09:43:18,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-12-21 09:43:18,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 49. [2021-12-21 09:43:18,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 41 states have (on average 1.3902439024390243) internal successors, (57), 42 states have internal predecessors, (57), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 09:43:18,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 66 transitions. [2021-12-21 09:43:18,089 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 66 transitions. Word has length 13 [2021-12-21 09:43:18,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:18,089 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 66 transitions. [2021-12-21 09:43:18,089 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:18,089 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 66 transitions. [2021-12-21 09:43:18,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-12-21 09:43:18,090 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:18,090 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:18,090 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-21 09:43:18,090 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:18,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:18,091 INFO L85 PathProgramCache]: Analyzing trace with hash -1753731807, now seen corresponding path program 1 times [2021-12-21 09:43:18,091 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:18,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942736049] [2021-12-21 09:43:18,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:18,092 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:18,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:18,154 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 09:43:18,155 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:18,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942736049] [2021-12-21 09:43:18,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [942736049] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 09:43:18,155 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 09:43:18,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-21 09:43:18,155 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287456973] [2021-12-21 09:43:18,156 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 09:43:18,156 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 09:43:18,157 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:18,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 09:43:18,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-21 09:43:18,157 INFO L87 Difference]: Start difference. First operand 49 states and 66 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:18,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:18,221 INFO L93 Difference]: Finished difference Result 105 states and 141 transitions. [2021-12-21 09:43:18,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-21 09:43:18,222 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-12-21 09:43:18,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:18,223 INFO L225 Difference]: With dead ends: 105 [2021-12-21 09:43:18,223 INFO L226 Difference]: Without dead ends: 69 [2021-12-21 09:43:18,223 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-12-21 09:43:18,224 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 50 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:18,225 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 265 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 09:43:18,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-12-21 09:43:18,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 65. [2021-12-21 09:43:18,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 57 states have (on average 1.4035087719298245) internal successors, (80), 58 states have internal predecessors, (80), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 09:43:18,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 89 transitions. [2021-12-21 09:43:18,231 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 89 transitions. Word has length 15 [2021-12-21 09:43:18,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:18,232 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 89 transitions. [2021-12-21 09:43:18,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:18,232 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 89 transitions. [2021-12-21 09:43:18,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-12-21 09:43:18,232 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:18,233 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:18,233 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-21 09:43:18,233 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:18,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:18,233 INFO L85 PathProgramCache]: Analyzing trace with hash 404200823, now seen corresponding path program 1 times [2021-12-21 09:43:18,234 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:18,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1188442788] [2021-12-21 09:43:18,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:18,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:18,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:18,322 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 09:43:18,322 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:18,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1188442788] [2021-12-21 09:43:18,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1188442788] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 09:43:18,324 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 09:43:18,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-21 09:43:18,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836258127] [2021-12-21 09:43:18,324 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 09:43:18,325 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 09:43:18,325 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:18,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 09:43:18,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-21 09:43:18,326 INFO L87 Difference]: Start difference. First operand 65 states and 89 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:18,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:18,392 INFO L93 Difference]: Finished difference Result 81 states and 106 transitions. [2021-12-21 09:43:18,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-21 09:43:18,394 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-12-21 09:43:18,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:18,398 INFO L225 Difference]: With dead ends: 81 [2021-12-21 09:43:18,398 INFO L226 Difference]: Without dead ends: 64 [2021-12-21 09:43:18,399 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-12-21 09:43:18,404 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 34 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:18,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 169 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 09:43:18,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-12-21 09:43:18,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2021-12-21 09:43:18,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 54 states have (on average 1.3333333333333333) internal successors, (72), 55 states have internal predecessors, (72), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 09:43:18,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 81 transitions. [2021-12-21 09:43:18,410 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 81 transitions. Word has length 16 [2021-12-21 09:43:18,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:18,410 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 81 transitions. [2021-12-21 09:43:18,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:18,410 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 81 transitions. [2021-12-21 09:43:18,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-21 09:43:18,411 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:18,411 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:18,411 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-21 09:43:18,411 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:18,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:18,411 INFO L85 PathProgramCache]: Analyzing trace with hash -1831341089, now seen corresponding path program 1 times [2021-12-21 09:43:18,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:18,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934754891] [2021-12-21 09:43:18,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:18,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:18,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:18,577 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 09:43:18,578 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:18,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934754891] [2021-12-21 09:43:18,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [934754891] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:18,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [226005965] [2021-12-21 09:43:18,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:18,579 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:18,579 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:18,580 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:18,581 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-21 09:43:18,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:18,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 09:43:18,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:18,847 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 09:43:18,847 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 09:43:18,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [226005965] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 09:43:18,847 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-21 09:43:18,847 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 12 [2021-12-21 09:43:18,848 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39180843] [2021-12-21 09:43:18,848 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 09:43:18,848 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 09:43:18,848 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:18,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 09:43:18,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-12-21 09:43:18,849 INFO L87 Difference]: Start difference. First operand 62 states and 81 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:18,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:18,932 INFO L93 Difference]: Finished difference Result 71 states and 89 transitions. [2021-12-21 09:43:18,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 09:43:18,933 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-12-21 09:43:18,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:18,936 INFO L225 Difference]: With dead ends: 71 [2021-12-21 09:43:18,936 INFO L226 Difference]: Without dead ends: 69 [2021-12-21 09:43:18,936 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-12-21 09:43:18,942 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 76 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:18,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 170 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 09:43:18,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-12-21 09:43:18,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2021-12-21 09:43:18,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 57 states have (on average 1.3157894736842106) internal successors, (75), 58 states have internal predecessors, (75), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 09:43:18,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 84 transitions. [2021-12-21 09:43:18,954 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 84 transitions. Word has length 17 [2021-12-21 09:43:18,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:18,954 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 84 transitions. [2021-12-21 09:43:18,954 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:18,954 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 84 transitions. [2021-12-21 09:43:18,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-21 09:43:18,955 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:18,955 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:18,972 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-21 09:43:19,167 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:19,168 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:19,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:19,169 INFO L85 PathProgramCache]: Analyzing trace with hash -251411362, now seen corresponding path program 1 times [2021-12-21 09:43:19,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:19,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703037926] [2021-12-21 09:43:19,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:19,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:19,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:19,237 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 09:43:19,238 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:19,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703037926] [2021-12-21 09:43:19,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1703037926] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 09:43:19,238 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 09:43:19,238 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-21 09:43:19,238 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699566129] [2021-12-21 09:43:19,238 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 09:43:19,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 09:43:19,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:19,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 09:43:19,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-21 09:43:19,239 INFO L87 Difference]: Start difference. First operand 66 states and 84 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:19,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:19,263 INFO L93 Difference]: Finished difference Result 78 states and 98 transitions. [2021-12-21 09:43:19,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 09:43:19,264 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-12-21 09:43:19,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:19,265 INFO L225 Difference]: With dead ends: 78 [2021-12-21 09:43:19,265 INFO L226 Difference]: Without dead ends: 54 [2021-12-21 09:43:19,265 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-21 09:43:19,266 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 16 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:19,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 160 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 09:43:19,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-12-21 09:43:19,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-12-21 09:43:19,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 45 states have (on average 1.3333333333333333) internal successors, (60), 46 states have internal predecessors, (60), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 09:43:19,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2021-12-21 09:43:19,271 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 18 [2021-12-21 09:43:19,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:19,271 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2021-12-21 09:43:19,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:19,272 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2021-12-21 09:43:19,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-21 09:43:19,272 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:19,272 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:19,272 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-12-21 09:43:19,273 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:19,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:19,273 INFO L85 PathProgramCache]: Analyzing trace with hash -2003533961, now seen corresponding path program 1 times [2021-12-21 09:43:19,273 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:19,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942188498] [2021-12-21 09:43:19,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:19,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:19,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:19,411 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 09:43:19,411 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:19,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942188498] [2021-12-21 09:43:19,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942188498] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:19,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364971761] [2021-12-21 09:43:19,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:19,412 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:19,412 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:19,413 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:19,414 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-21 09:43:19,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:19,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-21 09:43:19,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:19,533 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 09:43:19,533 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 09:43:19,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364971761] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 09:43:19,533 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-21 09:43:19,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [9] total 10 [2021-12-21 09:43:19,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188004553] [2021-12-21 09:43:19,534 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 09:43:19,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 09:43:19,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:19,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 09:43:19,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-12-21 09:43:19,535 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:19,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:19,582 INFO L93 Difference]: Finished difference Result 68 states and 85 transitions. [2021-12-21 09:43:19,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 09:43:19,583 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-12-21 09:43:19,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:19,583 INFO L225 Difference]: With dead ends: 68 [2021-12-21 09:43:19,583 INFO L226 Difference]: Without dead ends: 54 [2021-12-21 09:43:19,583 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-12-21 09:43:19,584 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 39 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:19,584 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 107 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 09:43:19,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-12-21 09:43:19,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-12-21 09:43:19,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 45 states have (on average 1.3111111111111111) internal successors, (59), 46 states have internal predecessors, (59), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 09:43:19,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 68 transitions. [2021-12-21 09:43:19,589 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 68 transitions. Word has length 18 [2021-12-21 09:43:19,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:19,589 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 68 transitions. [2021-12-21 09:43:19,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:19,590 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 68 transitions. [2021-12-21 09:43:19,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-21 09:43:19,590 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:19,590 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:19,607 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-21 09:43:19,806 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-12-21 09:43:19,807 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:19,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:19,807 INFO L85 PathProgramCache]: Analyzing trace with hash -1225946208, now seen corresponding path program 1 times [2021-12-21 09:43:19,807 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:19,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1520971126] [2021-12-21 09:43:19,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:19,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:19,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:19,845 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 09:43:19,845 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:19,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1520971126] [2021-12-21 09:43:19,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1520971126] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 09:43:19,845 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 09:43:19,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-21 09:43:19,846 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724466743] [2021-12-21 09:43:19,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 09:43:19,846 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-21 09:43:19,846 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:19,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-21 09:43:19,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 09:43:19,847 INFO L87 Difference]: Start difference. First operand 54 states and 68 transitions. Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:19,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:19,861 INFO L93 Difference]: Finished difference Result 90 states and 118 transitions. [2021-12-21 09:43:19,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-21 09:43:19,862 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-12-21 09:43:19,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:19,862 INFO L225 Difference]: With dead ends: 90 [2021-12-21 09:43:19,863 INFO L226 Difference]: Without dead ends: 76 [2021-12-21 09:43:19,863 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-21 09:43:19,864 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 22 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:19,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 120 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 09:43:19,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-12-21 09:43:19,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 59. [2021-12-21 09:43:19,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 50 states have (on average 1.32) internal successors, (66), 51 states have internal predecessors, (66), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 09:43:19,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 75 transitions. [2021-12-21 09:43:19,881 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 75 transitions. Word has length 20 [2021-12-21 09:43:19,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:19,882 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 75 transitions. [2021-12-21 09:43:19,882 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:19,882 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 75 transitions. [2021-12-21 09:43:19,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-21 09:43:19,883 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:19,884 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:19,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-12-21 09:43:19,884 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:19,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:19,886 INFO L85 PathProgramCache]: Analyzing trace with hash -1055739498, now seen corresponding path program 1 times [2021-12-21 09:43:19,886 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:19,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648157520] [2021-12-21 09:43:19,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:19,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:19,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:20,056 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 09:43:20,056 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:20,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648157520] [2021-12-21 09:43:20,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648157520] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:20,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1865236740] [2021-12-21 09:43:20,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:20,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:20,056 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:20,060 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:20,062 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-21 09:43:20,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:20,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 09:43:20,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:20,190 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 09:43:20,191 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 09:43:20,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1865236740] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 09:43:20,191 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-21 09:43:20,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 10 [2021-12-21 09:43:20,191 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979546042] [2021-12-21 09:43:20,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 09:43:20,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 09:43:20,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:20,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 09:43:20,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-12-21 09:43:20,194 INFO L87 Difference]: Start difference. First operand 59 states and 75 transitions. Second operand has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:20,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:20,265 INFO L93 Difference]: Finished difference Result 121 states and 155 transitions. [2021-12-21 09:43:20,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 09:43:20,266 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-12-21 09:43:20,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:20,267 INFO L225 Difference]: With dead ends: 121 [2021-12-21 09:43:20,267 INFO L226 Difference]: Without dead ends: 61 [2021-12-21 09:43:20,269 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-12-21 09:43:20,269 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 31 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:20,270 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 270 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 09:43:20,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-12-21 09:43:20,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2021-12-21 09:43:20,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 52 states have internal predecessors, (67), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 09:43:20,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 76 transitions. [2021-12-21 09:43:20,275 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 76 transitions. Word has length 24 [2021-12-21 09:43:20,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:20,275 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 76 transitions. [2021-12-21 09:43:20,275 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:20,275 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 76 transitions. [2021-12-21 09:43:20,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-21 09:43:20,278 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:20,278 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:20,296 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-12-21 09:43:20,490 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:20,491 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:20,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:20,491 INFO L85 PathProgramCache]: Analyzing trace with hash -458147624, now seen corresponding path program 1 times [2021-12-21 09:43:20,491 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:20,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [321662303] [2021-12-21 09:43:20,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:20,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:20,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:20,538 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 09:43:20,538 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:20,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [321662303] [2021-12-21 09:43:20,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [321662303] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:20,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764062649] [2021-12-21 09:43:20,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:20,539 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:20,539 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:20,540 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:20,541 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-21 09:43:20,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:20,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-21 09:43:20,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:20,723 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 09:43:20,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:43:20,861 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 09:43:20,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1764062649] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:43:20,861 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:43:20,862 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 10] total 15 [2021-12-21 09:43:20,862 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528574826] [2021-12-21 09:43:20,862 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:43:20,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-21 09:43:20,862 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:20,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-21 09:43:20,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-12-21 09:43:20,863 INFO L87 Difference]: Start difference. First operand 60 states and 76 transitions. Second operand has 15 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:21,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:21,020 INFO L93 Difference]: Finished difference Result 145 states and 193 transitions. [2021-12-21 09:43:21,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-21 09:43:21,020 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-12-21 09:43:21,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:21,021 INFO L225 Difference]: With dead ends: 145 [2021-12-21 09:43:21,021 INFO L226 Difference]: Without dead ends: 122 [2021-12-21 09:43:21,022 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 40 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2021-12-21 09:43:21,022 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 236 mSDsluCounter, 509 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 568 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:21,023 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [239 Valid, 568 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 09:43:21,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-12-21 09:43:21,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 90. [2021-12-21 09:43:21,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 80 states have (on average 1.325) internal successors, (106), 81 states have internal predecessors, (106), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 09:43:21,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 117 transitions. [2021-12-21 09:43:21,031 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 117 transitions. Word has length 26 [2021-12-21 09:43:21,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:21,031 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 117 transitions. [2021-12-21 09:43:21,032 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:21,032 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 117 transitions. [2021-12-21 09:43:21,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-21 09:43:21,032 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:21,033 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:21,051 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-12-21 09:43:21,249 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:21,249 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:21,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:21,250 INFO L85 PathProgramCache]: Analyzing trace with hash -456300582, now seen corresponding path program 1 times [2021-12-21 09:43:21,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:21,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901217823] [2021-12-21 09:43:21,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:21,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:21,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:21,335 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 09:43:21,335 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:21,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901217823] [2021-12-21 09:43:21,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1901217823] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:21,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [498513582] [2021-12-21 09:43:21,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:21,337 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:21,337 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:21,339 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:21,351 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-21 09:43:21,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:21,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-21 09:43:21,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:21,446 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:43:21,446 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 09:43:21,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [498513582] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 09:43:21,446 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-21 09:43:21,447 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7] total 9 [2021-12-21 09:43:21,447 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100438800] [2021-12-21 09:43:21,447 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 09:43:21,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 09:43:21,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:21,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 09:43:21,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-12-21 09:43:21,448 INFO L87 Difference]: Start difference. First operand 90 states and 117 transitions. Second operand has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:21,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:21,499 INFO L93 Difference]: Finished difference Result 124 states and 161 transitions. [2021-12-21 09:43:21,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 09:43:21,499 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-12-21 09:43:21,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:21,500 INFO L225 Difference]: With dead ends: 124 [2021-12-21 09:43:21,500 INFO L226 Difference]: Without dead ends: 110 [2021-12-21 09:43:21,500 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-12-21 09:43:21,501 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 55 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:21,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 134 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 09:43:21,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-12-21 09:43:21,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 96. [2021-12-21 09:43:21,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 86 states have (on average 1.313953488372093) internal successors, (113), 87 states have internal predecessors, (113), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 09:43:21,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 124 transitions. [2021-12-21 09:43:21,508 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 124 transitions. Word has length 26 [2021-12-21 09:43:21,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:21,508 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 124 transitions. [2021-12-21 09:43:21,508 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:21,508 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 124 transitions. [2021-12-21 09:43:21,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-21 09:43:21,509 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:21,509 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:21,541 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-21 09:43:21,726 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-21 09:43:21,726 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:21,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:21,727 INFO L85 PathProgramCache]: Analyzing trace with hash -993450261, now seen corresponding path program 1 times [2021-12-21 09:43:21,727 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:21,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257106262] [2021-12-21 09:43:21,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:21,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:21,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:21,816 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:43:21,816 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:21,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257106262] [2021-12-21 09:43:21,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1257106262] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:21,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1392516084] [2021-12-21 09:43:21,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:21,816 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:21,816 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:21,817 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:21,818 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-21 09:43:21,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:21,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-21 09:43:21,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:21,962 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 09:43:21,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:43:22,052 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 09:43:22,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1392516084] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:43:22,053 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:43:22,053 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 8] total 18 [2021-12-21 09:43:22,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537721461] [2021-12-21 09:43:22,054 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:43:22,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-21 09:43:22,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:22,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-21 09:43:22,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-12-21 09:43:22,063 INFO L87 Difference]: Start difference. First operand 96 states and 124 transitions. Second operand has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:22,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:22,380 INFO L93 Difference]: Finished difference Result 266 states and 357 transitions. [2021-12-21 09:43:22,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-21 09:43:22,381 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-12-21 09:43:22,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:22,382 INFO L225 Difference]: With dead ends: 266 [2021-12-21 09:43:22,382 INFO L226 Difference]: Without dead ends: 189 [2021-12-21 09:43:22,382 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2021-12-21 09:43:22,383 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 374 mSDsluCounter, 536 mSDsCounter, 0 mSdLazyCounter, 334 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 378 SdHoareTripleChecker+Valid, 603 SdHoareTripleChecker+Invalid, 399 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:22,383 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [378 Valid, 603 Invalid, 399 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 334 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 09:43:22,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-12-21 09:43:22,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 119. [2021-12-21 09:43:22,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 109 states have (on average 1.3027522935779816) internal successors, (142), 110 states have internal predecessors, (142), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 09:43:22,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 153 transitions. [2021-12-21 09:43:22,394 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 153 transitions. Word has length 27 [2021-12-21 09:43:22,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:22,394 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 153 transitions. [2021-12-21 09:43:22,394 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:22,394 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 153 transitions. [2021-12-21 09:43:22,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-21 09:43:22,395 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:22,395 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:22,413 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-21 09:43:22,603 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:22,604 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:22,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:22,604 INFO L85 PathProgramCache]: Analyzing trace with hash 1669286615, now seen corresponding path program 1 times [2021-12-21 09:43:22,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:22,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714331894] [2021-12-21 09:43:22,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:22,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:22,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:22,665 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-12-21 09:43:22,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:22,669 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-21 09:43:22,669 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:22,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714331894] [2021-12-21 09:43:22,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1714331894] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 09:43:22,669 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 09:43:22,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-21 09:43:22,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858150059] [2021-12-21 09:43:22,669 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 09:43:22,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-21 09:43:22,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:22,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-21 09:43:22,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-21 09:43:22,670 INFO L87 Difference]: Start difference. First operand 119 states and 153 transitions. Second operand has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 09:43:22,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:22,698 INFO L93 Difference]: Finished difference Result 149 states and 191 transitions. [2021-12-21 09:43:22,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-21 09:43:22,698 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-12-21 09:43:22,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:22,699 INFO L225 Difference]: With dead ends: 149 [2021-12-21 09:43:22,699 INFO L226 Difference]: Without dead ends: 128 [2021-12-21 09:43:22,700 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-21 09:43:22,700 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 5 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:22,701 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 165 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 09:43:22,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-12-21 09:43:22,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 122. [2021-12-21 09:43:22,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 112 states have (on average 1.3035714285714286) internal successors, (146), 113 states have internal predecessors, (146), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 09:43:22,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 157 transitions. [2021-12-21 09:43:22,714 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 157 transitions. Word has length 31 [2021-12-21 09:43:22,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:22,715 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 157 transitions. [2021-12-21 09:43:22,715 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-21 09:43:22,715 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 157 transitions. [2021-12-21 09:43:22,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-21 09:43:22,717 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:22,717 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:22,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-12-21 09:43:22,717 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:22,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:22,718 INFO L85 PathProgramCache]: Analyzing trace with hash 1241240931, now seen corresponding path program 1 times [2021-12-21 09:43:22,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:22,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448968133] [2021-12-21 09:43:22,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:22,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:22,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:22,791 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-21 09:43:22,791 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:22,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448968133] [2021-12-21 09:43:22,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1448968133] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:22,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [339044337] [2021-12-21 09:43:22,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:22,792 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:22,792 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:22,793 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:22,794 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-21 09:43:22,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:22,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-21 09:43:22,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:23,066 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 09:43:23,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:43:23,169 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-21 09:43:23,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [339044337] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:43:23,169 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:43:23,170 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 12, 7] total 20 [2021-12-21 09:43:23,170 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283287502] [2021-12-21 09:43:23,170 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:43:23,171 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-21 09:43:23,171 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:23,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-21 09:43:23,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2021-12-21 09:43:23,172 INFO L87 Difference]: Start difference. First operand 122 states and 157 transitions. Second operand has 20 states, 17 states have (on average 3.6470588235294117) internal successors, (62), 18 states have internal predecessors, (62), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:24,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:24,051 INFO L93 Difference]: Finished difference Result 359 states and 499 transitions. [2021-12-21 09:43:24,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-12-21 09:43:24,051 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 3.6470588235294117) internal successors, (62), 18 states have internal predecessors, (62), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-12-21 09:43:24,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:24,052 INFO L225 Difference]: With dead ends: 359 [2021-12-21 09:43:24,053 INFO L226 Difference]: Without dead ends: 329 [2021-12-21 09:43:24,053 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=322, Invalid=1658, Unknown=0, NotChecked=0, Total=1980 [2021-12-21 09:43:24,054 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 559 mSDsluCounter, 1096 mSDsCounter, 0 mSdLazyCounter, 618 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 559 SdHoareTripleChecker+Valid, 1215 SdHoareTripleChecker+Invalid, 766 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 618 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:24,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [559 Valid, 1215 Invalid, 766 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [148 Valid, 618 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-21 09:43:24,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2021-12-21 09:43:24,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 164. [2021-12-21 09:43:24,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 154 states have (on average 1.3506493506493507) internal successors, (208), 155 states have internal predecessors, (208), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 09:43:24,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 219 transitions. [2021-12-21 09:43:24,070 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 219 transitions. Word has length 31 [2021-12-21 09:43:24,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:24,070 INFO L470 AbstractCegarLoop]: Abstraction has 164 states and 219 transitions. [2021-12-21 09:43:24,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 3.6470588235294117) internal successors, (62), 18 states have internal predecessors, (62), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:24,070 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 219 transitions. [2021-12-21 09:43:24,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-21 09:43:24,070 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:24,071 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:24,089 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-21 09:43:24,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:24,284 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:24,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:24,284 INFO L85 PathProgramCache]: Analyzing trace with hash 431894305, now seen corresponding path program 1 times [2021-12-21 09:43:24,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:24,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [691763144] [2021-12-21 09:43:24,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:24,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:24,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:24,540 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-21 09:43:24,540 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:24,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [691763144] [2021-12-21 09:43:24,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [691763144] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:24,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859913266] [2021-12-21 09:43:24,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:24,541 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:24,541 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:24,542 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:24,543 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-21 09:43:24,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:24,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 56 conjunts are in the unsatisfiable core [2021-12-21 09:43:24,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:24,669 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-21 09:43:24,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 09:43:24,868 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 09:43:24,868 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 09:43:24,875 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-21 09:43:24,875 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 76 treesize of output 39 [2021-12-21 09:43:24,898 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 09:43:24,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:43:25,106 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-21 09:43:25,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [859913266] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:25,107 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-12-21 09:43:25,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [11, 13] total 27 [2021-12-21 09:43:25,107 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070714278] [2021-12-21 09:43:25,107 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 09:43:25,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-21 09:43:25,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:25,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-21 09:43:25,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2021-12-21 09:43:25,108 INFO L87 Difference]: Start difference. First operand 164 states and 219 transitions. Second operand has 12 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:25,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:25,462 INFO L93 Difference]: Finished difference Result 327 states and 448 transitions. [2021-12-21 09:43:25,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-21 09:43:25,463 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-12-21 09:43:25,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:25,464 INFO L225 Difference]: With dead ends: 327 [2021-12-21 09:43:25,464 INFO L226 Difference]: Without dead ends: 318 [2021-12-21 09:43:25,465 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=168, Invalid=954, Unknown=0, NotChecked=0, Total=1122 [2021-12-21 09:43:25,465 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 188 mSDsluCounter, 485 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 575 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:25,466 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [196 Valid, 575 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 262 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 09:43:25,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2021-12-21 09:43:25,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 207. [2021-12-21 09:43:25,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 197 states have (on average 1.3756345177664975) internal successors, (271), 198 states have internal predecessors, (271), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 09:43:25,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 282 transitions. [2021-12-21 09:43:25,508 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 282 transitions. Word has length 31 [2021-12-21 09:43:25,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:25,508 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 282 transitions. [2021-12-21 09:43:25,508 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:25,508 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 282 transitions. [2021-12-21 09:43:25,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-21 09:43:25,508 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:25,508 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:25,525 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-21 09:43:25,723 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-12-21 09:43:25,724 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:25,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:25,724 INFO L85 PathProgramCache]: Analyzing trace with hash 1856637752, now seen corresponding path program 1 times [2021-12-21 09:43:25,724 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:25,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1516567524] [2021-12-21 09:43:25,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:25,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:25,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:25,998 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 09:43:25,998 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:25,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1516567524] [2021-12-21 09:43:25,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1516567524] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:25,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [172222149] [2021-12-21 09:43:25,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:25,998 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:25,998 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:25,999 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:26,000 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-21 09:43:26,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:26,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-21 09:43:26,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:26,174 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-21 09:43:26,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:43:26,287 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-21 09:43:26,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [172222149] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:43:26,288 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:43:26,288 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8, 8] total 24 [2021-12-21 09:43:26,288 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370623668] [2021-12-21 09:43:26,288 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:43:26,288 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-21 09:43:26,288 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:26,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-21 09:43:26,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-12-21 09:43:26,289 INFO L87 Difference]: Start difference. First operand 207 states and 282 transitions. Second operand has 24 states, 24 states have (on average 2.6666666666666665) internal successors, (64), 24 states have internal predecessors, (64), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:28,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:28,938 INFO L93 Difference]: Finished difference Result 848 states and 1180 transitions. [2021-12-21 09:43:28,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-12-21 09:43:28,948 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.6666666666666665) internal successors, (64), 24 states have internal predecessors, (64), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-12-21 09:43:28,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:28,952 INFO L225 Difference]: With dead ends: 848 [2021-12-21 09:43:28,952 INFO L226 Difference]: Without dead ends: 767 [2021-12-21 09:43:28,955 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1003 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=545, Invalid=3487, Unknown=0, NotChecked=0, Total=4032 [2021-12-21 09:43:28,956 INFO L933 BasicCegarLoop]: 225 mSDtfsCounter, 1443 mSDsluCounter, 2484 mSDsCounter, 0 mSdLazyCounter, 1784 mSolverCounterSat, 388 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1443 SdHoareTripleChecker+Valid, 2709 SdHoareTripleChecker+Invalid, 2172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 388 IncrementalHoareTripleChecker+Valid, 1784 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:28,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1443 Valid, 2709 Invalid, 2172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [388 Valid, 1784 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-12-21 09:43:28,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 767 states. [2021-12-21 09:43:28,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 767 to 168. [2021-12-21 09:43:28,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 158 states have (on average 1.3354430379746836) internal successors, (211), 159 states have internal predecessors, (211), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 09:43:28,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 222 transitions. [2021-12-21 09:43:28,993 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 222 transitions. Word has length 32 [2021-12-21 09:43:28,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:28,993 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 222 transitions. [2021-12-21 09:43:28,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.6666666666666665) internal successors, (64), 24 states have internal predecessors, (64), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:28,994 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 222 transitions. [2021-12-21 09:43:28,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-21 09:43:28,994 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:28,994 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:29,013 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-21 09:43:29,208 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-12-21 09:43:29,208 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:29,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:29,208 INFO L85 PathProgramCache]: Analyzing trace with hash -337481851, now seen corresponding path program 1 times [2021-12-21 09:43:29,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:29,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1405862836] [2021-12-21 09:43:29,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:29,209 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:29,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:29,607 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 09:43:29,607 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:29,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1405862836] [2021-12-21 09:43:29,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1405862836] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:29,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534513679] [2021-12-21 09:43:29,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:29,608 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:29,608 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:29,609 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:29,635 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-21 09:43:29,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:29,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 52 conjunts are in the unsatisfiable core [2021-12-21 09:43:29,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:30,023 INFO L353 Elim1Store]: treesize reduction 3, result has 78.6 percent of original size [2021-12-21 09:43:30,023 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 22 [2021-12-21 09:43:30,041 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-21 09:43:30,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:43:30,243 INFO L353 Elim1Store]: treesize reduction 23, result has 78.3 percent of original size [2021-12-21 09:43:30,243 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 90 [2021-12-21 09:43:30,692 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-21 09:43:30,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1534513679] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:43:30,692 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:43:30,692 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 12] total 38 [2021-12-21 09:43:30,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187381966] [2021-12-21 09:43:30,693 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:43:30,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-12-21 09:43:30,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:30,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-12-21 09:43:30,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1225, Unknown=0, NotChecked=0, Total=1406 [2021-12-21 09:43:30,694 INFO L87 Difference]: Start difference. First operand 168 states and 222 transitions. Second operand has 38 states, 38 states have (on average 2.289473684210526) internal successors, (87), 38 states have internal predecessors, (87), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:31,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:31,769 INFO L93 Difference]: Finished difference Result 425 states and 573 transitions. [2021-12-21 09:43:31,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-21 09:43:31,770 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.289473684210526) internal successors, (87), 38 states have internal predecessors, (87), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-12-21 09:43:31,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:31,771 INFO L225 Difference]: With dead ends: 425 [2021-12-21 09:43:31,771 INFO L226 Difference]: Without dead ends: 331 [2021-12-21 09:43:31,772 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 750 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=348, Invalid=2102, Unknown=0, NotChecked=0, Total=2450 [2021-12-21 09:43:31,773 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 333 mSDsluCounter, 1360 mSDsCounter, 0 mSdLazyCounter, 1159 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 345 SdHoareTripleChecker+Valid, 1458 SdHoareTripleChecker+Invalid, 1217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 1159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:31,773 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [345 Valid, 1458 Invalid, 1217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 1159 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-21 09:43:31,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2021-12-21 09:43:31,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 180. [2021-12-21 09:43:31,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 170 states have (on average 1.3294117647058823) internal successors, (226), 171 states have internal predecessors, (226), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 09:43:31,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 237 transitions. [2021-12-21 09:43:31,806 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 237 transitions. Word has length 37 [2021-12-21 09:43:31,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:31,807 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 237 transitions. [2021-12-21 09:43:31,807 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.289473684210526) internal successors, (87), 38 states have internal predecessors, (87), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:31,807 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 237 transitions. [2021-12-21 09:43:31,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-21 09:43:31,808 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:31,808 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:31,827 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-21 09:43:32,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-12-21 09:43:32,025 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:32,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:32,026 INFO L85 PathProgramCache]: Analyzing trace with hash 363582727, now seen corresponding path program 1 times [2021-12-21 09:43:32,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:32,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731744046] [2021-12-21 09:43:32,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:32,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:32,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:32,420 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-21 09:43:32,421 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:32,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731744046] [2021-12-21 09:43:32,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731744046] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:32,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1613650180] [2021-12-21 09:43:32,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:32,421 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:32,421 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:32,422 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:32,422 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-21 09:43:32,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:32,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 50 conjunts are in the unsatisfiable core [2021-12-21 09:43:32,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:32,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 09:43:32,660 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 09:43:32,661 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 09:43:32,667 INFO L353 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-21 09:43:32,668 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 76 treesize of output 39 [2021-12-21 09:43:32,703 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-21 09:43:32,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:43:32,867 INFO L353 Elim1Store]: treesize reduction 20, result has 80.0 percent of original size [2021-12-21 09:43:32,867 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 87 [2021-12-21 09:43:33,054 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-21 09:43:33,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1613650180] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:43:33,055 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:43:33,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 11] total 24 [2021-12-21 09:43:33,055 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035693257] [2021-12-21 09:43:33,055 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:43:33,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-21 09:43:33,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:33,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-21 09:43:33,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=448, Unknown=0, NotChecked=0, Total=552 [2021-12-21 09:43:33,056 INFO L87 Difference]: Start difference. First operand 180 states and 237 transitions. Second operand has 24 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 23 states have internal predecessors, (67), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:33,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:33,429 INFO L93 Difference]: Finished difference Result 311 states and 416 transitions. [2021-12-21 09:43:33,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-21 09:43:33,429 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 23 states have internal predecessors, (67), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-12-21 09:43:33,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:33,430 INFO L225 Difference]: With dead ends: 311 [2021-12-21 09:43:33,430 INFO L226 Difference]: Without dead ends: 263 [2021-12-21 09:43:33,431 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 237 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=130, Invalid=520, Unknown=0, NotChecked=0, Total=650 [2021-12-21 09:43:33,431 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 276 mSDsluCounter, 663 mSDsCounter, 0 mSdLazyCounter, 374 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 745 SdHoareTripleChecker+Invalid, 430 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:33,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [288 Valid, 745 Invalid, 430 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 374 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 09:43:33,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2021-12-21 09:43:33,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 171. [2021-12-21 09:43:33,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 161 states have (on average 1.31055900621118) internal successors, (211), 162 states have internal predecessors, (211), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 09:43:33,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 222 transitions. [2021-12-21 09:43:33,461 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 222 transitions. Word has length 37 [2021-12-21 09:43:33,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:33,462 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 222 transitions. [2021-12-21 09:43:33,462 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 23 states have internal predecessors, (67), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:33,462 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 222 transitions. [2021-12-21 09:43:33,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-21 09:43:33,462 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:33,462 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:33,479 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-21 09:43:33,679 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-12-21 09:43:33,680 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:33,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:33,680 INFO L85 PathProgramCache]: Analyzing trace with hash 1398313997, now seen corresponding path program 1 times [2021-12-21 09:43:33,680 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:33,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290222739] [2021-12-21 09:43:33,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:33,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:33,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:33,766 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-12-21 09:43:33,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:33,769 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-21 09:43:33,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:33,771 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-21 09:43:33,771 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:33,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290222739] [2021-12-21 09:43:33,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [290222739] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:33,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840578100] [2021-12-21 09:43:33,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:33,772 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:33,772 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:33,772 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:33,773 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-21 09:43:33,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:33,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-21 09:43:33,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:33,923 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 09:43:33,923 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:43:34,028 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 09:43:34,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1840578100] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:43:34,028 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:43:34,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2021-12-21 09:43:34,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71333724] [2021-12-21 09:43:34,028 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:43:34,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-21 09:43:34,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:34,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-21 09:43:34,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-12-21 09:43:34,029 INFO L87 Difference]: Start difference. First operand 171 states and 222 transitions. Second operand has 16 states, 16 states have (on average 4.3125) internal successors, (69), 16 states have internal predecessors, (69), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 09:43:34,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:34,282 INFO L93 Difference]: Finished difference Result 220 states and 284 transitions. [2021-12-21 09:43:34,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-21 09:43:34,282 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.3125) internal successors, (69), 16 states have internal predecessors, (69), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 40 [2021-12-21 09:43:34,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:34,283 INFO L225 Difference]: With dead ends: 220 [2021-12-21 09:43:34,283 INFO L226 Difference]: Without dead ends: 170 [2021-12-21 09:43:34,283 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=118, Invalid=388, Unknown=0, NotChecked=0, Total=506 [2021-12-21 09:43:34,284 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 105 mSDsluCounter, 400 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 460 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:34,284 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 460 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 09:43:34,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-12-21 09:43:34,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 159. [2021-12-21 09:43:34,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 149 states have (on average 1.3154362416107384) internal successors, (196), 150 states have internal predecessors, (196), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 09:43:34,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 207 transitions. [2021-12-21 09:43:34,312 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 207 transitions. Word has length 40 [2021-12-21 09:43:34,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:34,312 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 207 transitions. [2021-12-21 09:43:34,312 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 4.3125) internal successors, (69), 16 states have internal predecessors, (69), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-21 09:43:34,312 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 207 transitions. [2021-12-21 09:43:34,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-21 09:43:34,313 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:34,313 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:34,329 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-21 09:43:34,514 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-12-21 09:43:34,515 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:34,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:34,515 INFO L85 PathProgramCache]: Analyzing trace with hash -1574291585, now seen corresponding path program 1 times [2021-12-21 09:43:34,515 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:34,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1516842869] [2021-12-21 09:43:34,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:34,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:34,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:34,633 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-21 09:43:34,633 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:34,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1516842869] [2021-12-21 09:43:34,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1516842869] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:34,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [106270] [2021-12-21 09:43:34,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:34,634 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:34,634 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:34,635 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:34,636 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-21 09:43:34,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:34,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 53 conjunts are in the unsatisfiable core [2021-12-21 09:43:34,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:34,722 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 09:43:34,942 INFO L353 Elim1Store]: treesize reduction 87, result has 36.0 percent of original size [2021-12-21 09:43:34,942 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 83 treesize of output 84 [2021-12-21 09:43:34,978 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-21 09:43:34,978 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:43:35,330 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-21 09:43:35,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [106270] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:43:35,330 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:43:35,330 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12, 14] total 29 [2021-12-21 09:43:35,330 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1410300470] [2021-12-21 09:43:35,330 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:43:35,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-12-21 09:43:35,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:35,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-12-21 09:43:35,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=727, Unknown=0, NotChecked=0, Total=812 [2021-12-21 09:43:35,331 INFO L87 Difference]: Start difference. First operand 159 states and 207 transitions. Second operand has 29 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 28 states have internal predecessors, (85), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:38,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:38,078 INFO L93 Difference]: Finished difference Result 894 states and 1238 transitions. [2021-12-21 09:43:38,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-12-21 09:43:38,079 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 28 states have internal predecessors, (85), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-12-21 09:43:38,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:38,081 INFO L225 Difference]: With dead ends: 894 [2021-12-21 09:43:38,081 INFO L226 Difference]: Without dead ends: 769 [2021-12-21 09:43:38,082 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 689 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=567, Invalid=3465, Unknown=0, NotChecked=0, Total=4032 [2021-12-21 09:43:38,083 INFO L933 BasicCegarLoop]: 202 mSDtfsCounter, 1337 mSDsluCounter, 2635 mSDsCounter, 0 mSdLazyCounter, 2267 mSolverCounterSat, 458 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1349 SdHoareTripleChecker+Valid, 2837 SdHoareTripleChecker+Invalid, 2725 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 458 IncrementalHoareTripleChecker+Valid, 2267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:38,083 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1349 Valid, 2837 Invalid, 2725 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [458 Valid, 2267 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-12-21 09:43:38,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 769 states. [2021-12-21 09:43:38,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 769 to 270. [2021-12-21 09:43:38,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 259 states have (on average 1.3281853281853282) internal successors, (344), 260 states have internal predecessors, (344), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 09:43:38,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 357 transitions. [2021-12-21 09:43:38,142 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 357 transitions. Word has length 39 [2021-12-21 09:43:38,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:38,142 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 357 transitions. [2021-12-21 09:43:38,143 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 28 states have internal predecessors, (85), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:38,143 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 357 transitions. [2021-12-21 09:43:38,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-21 09:43:38,143 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:38,143 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:38,160 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-21 09:43:38,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:38,353 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:38,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:38,353 INFO L85 PathProgramCache]: Analyzing trace with hash 916341538, now seen corresponding path program 1 times [2021-12-21 09:43:38,353 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:38,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861150071] [2021-12-21 09:43:38,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:38,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:38,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:38,492 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-21 09:43:38,492 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:38,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861150071] [2021-12-21 09:43:38,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [861150071] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:38,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [76424036] [2021-12-21 09:43:38,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:38,492 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:38,492 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:38,493 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:38,494 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-21 09:43:38,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:38,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 09:43:38,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:38,867 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-21 09:43:38,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:43:39,268 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-21 09:43:39,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [76424036] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:43:39,268 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:43:39,268 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 10] total 23 [2021-12-21 09:43:39,268 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426255704] [2021-12-21 09:43:39,268 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:43:39,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-21 09:43:39,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:39,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-21 09:43:39,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2021-12-21 09:43:39,269 INFO L87 Difference]: Start difference. First operand 270 states and 357 transitions. Second operand has 23 states, 23 states have (on average 2.6956521739130435) internal successors, (62), 23 states have internal predecessors, (62), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:40,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:40,654 INFO L93 Difference]: Finished difference Result 726 states and 974 transitions. [2021-12-21 09:43:40,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-21 09:43:40,654 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.6956521739130435) internal successors, (62), 23 states have internal predecessors, (62), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-12-21 09:43:40,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:40,656 INFO L225 Difference]: With dead ends: 726 [2021-12-21 09:43:40,656 INFO L226 Difference]: Without dead ends: 528 [2021-12-21 09:43:40,657 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 62 SyntacticMatches, 10 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=207, Invalid=983, Unknown=0, NotChecked=0, Total=1190 [2021-12-21 09:43:40,657 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 721 mSDsluCounter, 1160 mSDsCounter, 0 mSdLazyCounter, 599 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 721 SdHoareTripleChecker+Valid, 1289 SdHoareTripleChecker+Invalid, 785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 599 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 58 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:40,657 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [721 Valid, 1289 Invalid, 785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 599 Invalid, 0 Unknown, 58 Unchecked, 0.8s Time] [2021-12-21 09:43:40,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2021-12-21 09:43:40,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 302. [2021-12-21 09:43:40,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 291 states have (on average 1.3402061855670102) internal successors, (390), 292 states have internal predecessors, (390), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 09:43:40,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 403 transitions. [2021-12-21 09:43:40,733 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 403 transitions. Word has length 40 [2021-12-21 09:43:40,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:40,733 INFO L470 AbstractCegarLoop]: Abstraction has 302 states and 403 transitions. [2021-12-21 09:43:40,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.6956521739130435) internal successors, (62), 23 states have internal predecessors, (62), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:40,734 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 403 transitions. [2021-12-21 09:43:40,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-21 09:43:40,734 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:40,735 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:40,754 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-12-21 09:43:40,943 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:40,944 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:40,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:40,944 INFO L85 PathProgramCache]: Analyzing trace with hash 1152781740, now seen corresponding path program 1 times [2021-12-21 09:43:40,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:40,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [729885543] [2021-12-21 09:43:40,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:40,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:40,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:41,028 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-12-21 09:43:41,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:41,031 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-21 09:43:41,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:41,034 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 09:43:41,035 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:41,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [729885543] [2021-12-21 09:43:41,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [729885543] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:41,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844287139] [2021-12-21 09:43:41,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:41,035 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:41,035 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:41,036 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:41,037 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-21 09:43:41,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:41,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-21 09:43:41,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:41,201 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-21 09:43:41,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:43:41,318 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 09:43:41,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1844287139] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:43:41,318 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:43:41,318 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 7] total 15 [2021-12-21 09:43:41,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802609887] [2021-12-21 09:43:41,319 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:43:41,319 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-21 09:43:41,319 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:41,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-21 09:43:41,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-12-21 09:43:41,320 INFO L87 Difference]: Start difference. First operand 302 states and 403 transitions. Second operand has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 09:43:41,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:41,619 INFO L93 Difference]: Finished difference Result 373 states and 491 transitions. [2021-12-21 09:43:41,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-21 09:43:41,619 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 43 [2021-12-21 09:43:41,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:41,621 INFO L225 Difference]: With dead ends: 373 [2021-12-21 09:43:41,621 INFO L226 Difference]: Without dead ends: 329 [2021-12-21 09:43:41,621 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 81 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-12-21 09:43:41,622 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 63 mSDsluCounter, 455 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 506 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:41,622 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 506 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 241 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 09:43:41,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2021-12-21 09:43:41,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 305. [2021-12-21 09:43:41,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 294 states have (on average 1.3299319727891157) internal successors, (391), 295 states have internal predecessors, (391), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 09:43:41,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 404 transitions. [2021-12-21 09:43:41,695 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 404 transitions. Word has length 43 [2021-12-21 09:43:41,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:41,695 INFO L470 AbstractCegarLoop]: Abstraction has 305 states and 404 transitions. [2021-12-21 09:43:41,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 09:43:41,695 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 404 transitions. [2021-12-21 09:43:41,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-12-21 09:43:41,696 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:41,696 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:41,712 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-12-21 09:43:41,896 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:41,896 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:41,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:41,897 INFO L85 PathProgramCache]: Analyzing trace with hash 1493374564, now seen corresponding path program 2 times [2021-12-21 09:43:41,897 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:41,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858086177] [2021-12-21 09:43:41,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:41,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:41,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:42,262 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 09:43:42,263 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:42,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858086177] [2021-12-21 09:43:42,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858086177] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:42,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885380865] [2021-12-21 09:43:42,263 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 09:43:42,263 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:42,263 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:42,264 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:42,264 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-21 09:43:42,334 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 09:43:42,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:43:42,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 09:43:42,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:42,505 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-12-21 09:43:42,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:43:42,687 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-12-21 09:43:42,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1885380865] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:43:42,687 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:43:42,688 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 10, 10] total 32 [2021-12-21 09:43:42,688 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815681931] [2021-12-21 09:43:42,688 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:43:42,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-12-21 09:43:42,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:42,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-12-21 09:43:42,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=898, Unknown=0, NotChecked=0, Total=992 [2021-12-21 09:43:42,689 INFO L87 Difference]: Start difference. First operand 305 states and 404 transitions. Second operand has 32 states, 32 states have (on average 2.625) internal successors, (84), 32 states have internal predecessors, (84), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:54,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:54,577 INFO L93 Difference]: Finished difference Result 2242 states and 3045 transitions. [2021-12-21 09:43:54,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-12-21 09:43:54,577 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.625) internal successors, (84), 32 states have internal predecessors, (84), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-12-21 09:43:54,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:54,583 INFO L225 Difference]: With dead ends: 2242 [2021-12-21 09:43:54,583 INFO L226 Difference]: Without dead ends: 2145 [2021-12-21 09:43:54,591 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6792 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=2308, Invalid=18572, Unknown=0, NotChecked=0, Total=20880 [2021-12-21 09:43:54,592 INFO L933 BasicCegarLoop]: 423 mSDtfsCounter, 3747 mSDsluCounter, 5145 mSDsCounter, 0 mSdLazyCounter, 4157 mSolverCounterSat, 1015 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3751 SdHoareTripleChecker+Valid, 5568 SdHoareTripleChecker+Invalid, 5172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1015 IncrementalHoareTripleChecker+Valid, 4157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:54,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3751 Valid, 5568 Invalid, 5172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1015 Valid, 4157 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2021-12-21 09:43:54,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2145 states. [2021-12-21 09:43:54,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2145 to 256. [2021-12-21 09:43:54,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 245 states have (on average 1.310204081632653) internal successors, (321), 246 states have internal predecessors, (321), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 09:43:54,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 334 transitions. [2021-12-21 09:43:54,689 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 334 transitions. Word has length 42 [2021-12-21 09:43:54,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:54,689 INFO L470 AbstractCegarLoop]: Abstraction has 256 states and 334 transitions. [2021-12-21 09:43:54,690 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.625) internal successors, (84), 32 states have internal predecessors, (84), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:54,690 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 334 transitions. [2021-12-21 09:43:54,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-21 09:43:54,690 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:54,690 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:54,708 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-12-21 09:43:54,896 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-12-21 09:43:54,897 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:54,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:54,897 INFO L85 PathProgramCache]: Analyzing trace with hash 841725603, now seen corresponding path program 2 times [2021-12-21 09:43:54,897 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:54,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528912577] [2021-12-21 09:43:54,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:54,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:54,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:54,993 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-21 09:43:54,993 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:54,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528912577] [2021-12-21 09:43:54,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [528912577] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:54,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2058343231] [2021-12-21 09:43:54,993 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 09:43:54,993 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:54,993 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:54,994 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:54,995 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-21 09:43:55,064 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 09:43:55,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:43:55,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-21 09:43:55,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:55,187 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 16 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-12-21 09:43:55,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:43:55,305 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-12-21 09:43:55,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2058343231] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:43:55,305 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:43:55,306 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 7] total 21 [2021-12-21 09:43:55,306 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550108347] [2021-12-21 09:43:55,306 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:43:55,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-21 09:43:55,306 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:55,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-21 09:43:55,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=373, Unknown=0, NotChecked=0, Total=420 [2021-12-21 09:43:55,306 INFO L87 Difference]: Start difference. First operand 256 states and 334 transitions. Second operand has 21 states, 20 states have (on average 3.9) internal successors, (78), 20 states have internal predecessors, (78), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:55,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:55,712 INFO L93 Difference]: Finished difference Result 327 states and 427 transitions. [2021-12-21 09:43:55,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-21 09:43:55,713 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 3.9) internal successors, (78), 20 states have internal predecessors, (78), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-12-21 09:43:55,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:55,714 INFO L225 Difference]: With dead ends: 327 [2021-12-21 09:43:55,714 INFO L226 Difference]: Without dead ends: 277 [2021-12-21 09:43:55,714 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=566, Unknown=0, NotChecked=0, Total=650 [2021-12-21 09:43:55,714 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 55 mSDsluCounter, 1149 mSDsCounter, 0 mSdLazyCounter, 567 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 1228 SdHoareTripleChecker+Invalid, 580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 567 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:55,715 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 1228 Invalid, 580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 567 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 09:43:55,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2021-12-21 09:43:55,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 266. [2021-12-21 09:43:55,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 255 states have (on average 1.3137254901960784) internal successors, (335), 256 states have internal predecessors, (335), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 09:43:55,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 348 transitions. [2021-12-21 09:43:55,802 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 348 transitions. Word has length 43 [2021-12-21 09:43:55,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:55,803 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 348 transitions. [2021-12-21 09:43:55,803 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 3.9) internal successors, (78), 20 states have internal predecessors, (78), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:43:55,803 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 348 transitions. [2021-12-21 09:43:55,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-21 09:43:55,803 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:55,804 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:55,823 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-12-21 09:43:56,004 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:56,005 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:56,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:56,005 INFO L85 PathProgramCache]: Analyzing trace with hash -2028075032, now seen corresponding path program 1 times [2021-12-21 09:43:56,005 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:56,005 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1167752464] [2021-12-21 09:43:56,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:56,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:56,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:56,193 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-21 09:43:56,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:56,196 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-12-21 09:43:56,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:56,203 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:43:56,203 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:56,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1167752464] [2021-12-21 09:43:56,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1167752464] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:56,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1431706779] [2021-12-21 09:43:56,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:56,203 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:56,203 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:56,204 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:56,205 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-21 09:43:56,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:56,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-21 09:43:56,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:56,407 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-21 09:43:56,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:43:56,532 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-21 09:43:56,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1431706779] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:56,532 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-12-21 09:43:56,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [12, 7] total 19 [2021-12-21 09:43:56,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798068087] [2021-12-21 09:43:56,532 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 09:43:56,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-21 09:43:56,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:56,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-21 09:43:56,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=273, Unknown=0, NotChecked=0, Total=342 [2021-12-21 09:43:56,533 INFO L87 Difference]: Start difference. First operand 266 states and 348 transitions. Second operand has 6 states, 6 states have (on average 5.833333333333333) internal successors, (35), 6 states have internal predecessors, (35), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 09:43:56,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:56,733 INFO L93 Difference]: Finished difference Result 330 states and 431 transitions. [2021-12-21 09:43:56,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 09:43:56,734 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.833333333333333) internal successors, (35), 6 states have internal predecessors, (35), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 45 [2021-12-21 09:43:56,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:56,734 INFO L225 Difference]: With dead ends: 330 [2021-12-21 09:43:56,734 INFO L226 Difference]: Without dead ends: 294 [2021-12-21 09:43:56,735 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2021-12-21 09:43:56,735 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 123 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:56,735 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 149 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 09:43:56,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2021-12-21 09:43:56,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 272. [2021-12-21 09:43:56,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 260 states have (on average 1.3038461538461539) internal successors, (339), 261 states have internal predecessors, (339), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-21 09:43:56,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 354 transitions. [2021-12-21 09:43:56,827 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 354 transitions. Word has length 45 [2021-12-21 09:43:56,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:56,827 INFO L470 AbstractCegarLoop]: Abstraction has 272 states and 354 transitions. [2021-12-21 09:43:56,827 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.833333333333333) internal successors, (35), 6 states have internal predecessors, (35), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-21 09:43:56,827 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 354 transitions. [2021-12-21 09:43:56,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 09:43:56,828 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:56,828 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:56,845 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-12-21 09:43:57,044 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:57,044 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:57,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:57,045 INFO L85 PathProgramCache]: Analyzing trace with hash 1386234216, now seen corresponding path program 2 times [2021-12-21 09:43:57,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:57,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [725875803] [2021-12-21 09:43:57,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:57,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:57,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:57,136 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-21 09:43:57,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:57,139 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-12-21 09:43:57,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:57,152 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-21 09:43:57,152 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:57,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [725875803] [2021-12-21 09:43:57,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [725875803] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:57,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1789245090] [2021-12-21 09:43:57,152 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 09:43:57,152 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:57,152 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:57,153 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:57,154 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-21 09:43:57,220 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 09:43:57,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:43:57,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-21 09:43:57,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:57,352 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-21 09:43:57,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:43:57,477 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-21 09:43:57,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1789245090] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:57,477 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-12-21 09:43:57,477 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [6, 8] total 14 [2021-12-21 09:43:57,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132378552] [2021-12-21 09:43:57,477 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 09:43:57,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-21 09:43:57,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:57,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-21 09:43:57,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-12-21 09:43:57,478 INFO L87 Difference]: Start difference. First operand 272 states and 354 transitions. Second operand has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 7 states have internal predecessors, (36), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-21 09:43:57,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:43:57,633 INFO L93 Difference]: Finished difference Result 308 states and 396 transitions. [2021-12-21 09:43:57,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 09:43:57,634 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 7 states have internal predecessors, (36), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 47 [2021-12-21 09:43:57,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:43:57,635 INFO L225 Difference]: With dead ends: 308 [2021-12-21 09:43:57,635 INFO L226 Difference]: Without dead ends: 268 [2021-12-21 09:43:57,635 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-12-21 09:43:57,635 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 139 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 09:43:57,635 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 122 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 09:43:57,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-12-21 09:43:57,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 266. [2021-12-21 09:43:57,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 255 states have (on average 1.3019607843137255) internal successors, (332), 256 states have internal predecessors, (332), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 09:43:57,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 345 transitions. [2021-12-21 09:43:57,739 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 345 transitions. Word has length 47 [2021-12-21 09:43:57,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:43:57,739 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 345 transitions. [2021-12-21 09:43:57,739 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 7 states have internal predecessors, (36), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-12-21 09:43:57,739 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 345 transitions. [2021-12-21 09:43:57,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-21 09:43:57,740 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:43:57,740 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:43:57,760 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-12-21 09:43:57,947 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:57,948 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:43:57,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:43:57,948 INFO L85 PathProgramCache]: Analyzing trace with hash 1011805829, now seen corresponding path program 1 times [2021-12-21 09:43:57,948 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:43:57,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1862006006] [2021-12-21 09:43:57,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:57,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:43:57,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:58,280 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-12-21 09:43:58,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:58,288 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-12-21 09:43:58,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:58,290 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-21 09:43:58,290 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:43:58,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1862006006] [2021-12-21 09:43:58,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1862006006] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:43:58,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700876900] [2021-12-21 09:43:58,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:43:58,291 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:43:58,291 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:43:58,291 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:43:58,292 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-21 09:43:58,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:43:58,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 23 conjunts are in the unsatisfiable core [2021-12-21 09:43:58,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:43:58,571 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-21 09:43:58,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:43:58,839 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-21 09:43:58,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700876900] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:43:58,839 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:43:58,839 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10, 9] total 27 [2021-12-21 09:43:58,839 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616055835] [2021-12-21 09:43:58,839 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:43:58,839 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-21 09:43:58,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:43:58,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-21 09:43:58,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2021-12-21 09:43:58,841 INFO L87 Difference]: Start difference. First operand 266 states and 345 transitions. Second operand has 27 states, 27 states have (on average 3.185185185185185) internal successors, (86), 27 states have internal predecessors, (86), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-21 09:44:01,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:44:01,212 INFO L93 Difference]: Finished difference Result 592 states and 777 transitions. [2021-12-21 09:44:01,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-12-21 09:44:01,212 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.185185185185185) internal successors, (86), 27 states have internal predecessors, (86), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 48 [2021-12-21 09:44:01,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:44:01,214 INFO L225 Difference]: With dead ends: 592 [2021-12-21 09:44:01,214 INFO L226 Difference]: Without dead ends: 520 [2021-12-21 09:44:01,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 608 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=421, Invalid=2335, Unknown=0, NotChecked=0, Total=2756 [2021-12-21 09:44:01,215 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 943 mSDsluCounter, 842 mSDsCounter, 0 mSdLazyCounter, 830 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 943 SdHoareTripleChecker+Valid, 931 SdHoareTripleChecker+Invalid, 991 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 830 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-21 09:44:01,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [943 Valid, 931 Invalid, 991 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 830 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-12-21 09:44:01,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2021-12-21 09:44:01,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 266. [2021-12-21 09:44:01,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 255 states have (on average 1.2784313725490195) internal successors, (326), 256 states have internal predecessors, (326), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 09:44:01,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 339 transitions. [2021-12-21 09:44:01,322 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 339 transitions. Word has length 48 [2021-12-21 09:44:01,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:44:01,322 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 339 transitions. [2021-12-21 09:44:01,322 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 3.185185185185185) internal successors, (86), 27 states have internal predecessors, (86), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-12-21 09:44:01,322 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 339 transitions. [2021-12-21 09:44:01,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 09:44:01,323 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:44:01,323 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:44:01,339 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-12-21 09:44:01,523 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-12-21 09:44:01,523 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:44:01,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:44:01,524 INFO L85 PathProgramCache]: Analyzing trace with hash -1719898279, now seen corresponding path program 3 times [2021-12-21 09:44:01,524 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:44:01,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1228271660] [2021-12-21 09:44:01,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:44:01,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:44:01,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:44:01,962 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-21 09:44:01,963 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:44:01,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1228271660] [2021-12-21 09:44:01,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1228271660] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:44:01,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [693637243] [2021-12-21 09:44:01,963 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 09:44:01,963 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:44:01,963 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:44:01,964 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:44:01,964 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-12-21 09:44:02,197 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-21 09:44:02,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:44:02,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 41 conjunts are in the unsatisfiable core [2021-12-21 09:44:02,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:44:02,428 INFO L353 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-21 09:44:02,429 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 10 [2021-12-21 09:44:02,451 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-12-21 09:44:02,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:44:02,589 INFO L353 Elim1Store]: treesize reduction 24, result has 76.0 percent of original size [2021-12-21 09:44:02,589 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 83 [2021-12-21 09:44:02,806 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-12-21 09:44:02,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [693637243] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:44:02,806 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:44:02,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 9, 8] total 29 [2021-12-21 09:44:02,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776301726] [2021-12-21 09:44:02,806 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:44:02,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-12-21 09:44:02,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:44:02,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-12-21 09:44:02,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=713, Unknown=0, NotChecked=0, Total=812 [2021-12-21 09:44:02,807 INFO L87 Difference]: Start difference. First operand 266 states and 339 transitions. Second operand has 29 states, 29 states have (on average 2.793103448275862) internal successors, (81), 29 states have internal predecessors, (81), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:44:04,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:44:04,262 INFO L93 Difference]: Finished difference Result 642 states and 850 transitions. [2021-12-21 09:44:04,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-12-21 09:44:04,263 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.793103448275862) internal successors, (81), 29 states have internal predecessors, (81), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-12-21 09:44:04,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:44:04,264 INFO L225 Difference]: With dead ends: 642 [2021-12-21 09:44:04,264 INFO L226 Difference]: Without dead ends: 534 [2021-12-21 09:44:04,265 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 553 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=407, Invalid=2349, Unknown=0, NotChecked=0, Total=2756 [2021-12-21 09:44:04,265 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 501 mSDsluCounter, 1381 mSDsCounter, 0 mSdLazyCounter, 1281 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 505 SdHoareTripleChecker+Valid, 1499 SdHoareTripleChecker+Invalid, 1433 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 1281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-21 09:44:04,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [505 Valid, 1499 Invalid, 1433 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 1281 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-12-21 09:44:04,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 534 states. [2021-12-21 09:44:04,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 534 to 270. [2021-12-21 09:44:04,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 259 states have (on average 1.2664092664092663) internal successors, (328), 260 states have internal predecessors, (328), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 09:44:04,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 341 transitions. [2021-12-21 09:44:04,375 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 341 transitions. Word has length 47 [2021-12-21 09:44:04,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:44:04,375 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 341 transitions. [2021-12-21 09:44:04,375 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.793103448275862) internal successors, (81), 29 states have internal predecessors, (81), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:44:04,376 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 341 transitions. [2021-12-21 09:44:04,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 09:44:04,376 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:44:04,376 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:44:04,381 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-12-21 09:44:04,579 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-12-21 09:44:04,579 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:44:04,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:44:04,580 INFO L85 PathProgramCache]: Analyzing trace with hash 862887189, now seen corresponding path program 4 times [2021-12-21 09:44:04,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:44:04,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554071587] [2021-12-21 09:44:04,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:44:04,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:44:04,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:44:05,000 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-21 09:44:05,000 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:44:05,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554071587] [2021-12-21 09:44:05,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554071587] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:44:05,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1281370321] [2021-12-21 09:44:05,000 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 09:44:05,000 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:44:05,000 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:44:05,001 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:44:05,002 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-21 09:44:05,078 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 09:44:05,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:44:05,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 62 conjunts are in the unsatisfiable core [2021-12-21 09:44:05,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:44:05,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 09:44:05,536 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 09:44:05,552 INFO L353 Elim1Store]: treesize reduction 27, result has 57.8 percent of original size [2021-12-21 09:44:05,552 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 78 treesize of output 72 [2021-12-21 09:44:05,585 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 28 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-21 09:44:05,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:44:05,997 INFO L353 Elim1Store]: treesize reduction 26, result has 76.8 percent of original size [2021-12-21 09:44:05,997 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 93 [2021-12-21 09:44:06,582 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:44:06,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1281370321] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:44:06,582 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:44:06,582 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 17] total 50 [2021-12-21 09:44:06,583 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197514569] [2021-12-21 09:44:06,583 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:44:06,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-12-21 09:44:06,583 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:44:06,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-12-21 09:44:06,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=2212, Unknown=0, NotChecked=0, Total=2450 [2021-12-21 09:44:06,584 INFO L87 Difference]: Start difference. First operand 270 states and 341 transitions. Second operand has 50 states, 50 states have (on average 2.3) internal successors, (115), 49 states have internal predecessors, (115), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:44:08,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:44:08,460 INFO L93 Difference]: Finished difference Result 472 states and 613 transitions. [2021-12-21 09:44:08,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-12-21 09:44:08,460 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.3) internal successors, (115), 49 states have internal predecessors, (115), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-12-21 09:44:08,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:44:08,462 INFO L225 Difference]: With dead ends: 472 [2021-12-21 09:44:08,462 INFO L226 Difference]: Without dead ends: 441 [2021-12-21 09:44:08,466 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1341 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=575, Invalid=4255, Unknown=0, NotChecked=0, Total=4830 [2021-12-21 09:44:08,467 INFO L933 BasicCegarLoop]: 113 mSDtfsCounter, 234 mSDsluCounter, 2246 mSDsCounter, 0 mSdLazyCounter, 1560 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 2359 SdHoareTripleChecker+Invalid, 1621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 1560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-21 09:44:08,467 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [242 Valid, 2359 Invalid, 1621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 1560 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-12-21 09:44:08,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2021-12-21 09:44:08,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 276. [2021-12-21 09:44:08,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 265 states have (on average 1.260377358490566) internal successors, (334), 266 states have internal predecessors, (334), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 09:44:08,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 347 transitions. [2021-12-21 09:44:08,586 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 347 transitions. Word has length 47 [2021-12-21 09:44:08,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:44:08,586 INFO L470 AbstractCegarLoop]: Abstraction has 276 states and 347 transitions. [2021-12-21 09:44:08,586 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.3) internal successors, (115), 49 states have internal predecessors, (115), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:44:08,586 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 347 transitions. [2021-12-21 09:44:08,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 09:44:08,587 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:44:08,587 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:44:08,604 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-12-21 09:44:08,792 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-12-21 09:44:08,793 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:44:08,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:44:08,793 INFO L85 PathProgramCache]: Analyzing trace with hash -144056787, now seen corresponding path program 5 times [2021-12-21 09:44:08,793 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:44:08,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995898955] [2021-12-21 09:44:08,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:44:08,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:44:08,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:44:09,227 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-21 09:44:09,227 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:44:09,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995898955] [2021-12-21 09:44:09,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1995898955] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:44:09,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2102689194] [2021-12-21 09:44:09,228 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 09:44:09,228 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:44:09,228 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:44:09,229 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:44:09,230 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-12-21 09:44:10,054 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-12-21 09:44:10,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:44:10,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 75 conjunts are in the unsatisfiable core [2021-12-21 09:44:10,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:44:10,068 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-12-21 09:44:10,185 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-21 09:44:10,261 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 09:44:10,279 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 09:44:10,299 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-21 09:44:10,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-21 09:44:10,981 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-21 09:44:10,982 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 74 treesize of output 36 [2021-12-21 09:44:11,018 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 29 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 09:44:11,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:44:11,627 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 15 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:44:11,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2102689194] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:44:11,627 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:44:11,628 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 20, 17] total 52 [2021-12-21 09:44:11,628 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755459798] [2021-12-21 09:44:11,628 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:44:11,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-12-21 09:44:11,628 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:44:11,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-12-21 09:44:11,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=2353, Unknown=0, NotChecked=0, Total=2652 [2021-12-21 09:44:11,629 INFO L87 Difference]: Start difference. First operand 276 states and 347 transitions. Second operand has 52 states, 52 states have (on average 2.2115384615384617) internal successors, (115), 51 states have internal predecessors, (115), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:44:13,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:44:13,570 INFO L93 Difference]: Finished difference Result 544 states and 707 transitions. [2021-12-21 09:44:13,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-12-21 09:44:13,571 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.2115384615384617) internal successors, (115), 51 states have internal predecessors, (115), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-12-21 09:44:13,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:44:13,572 INFO L225 Difference]: With dead ends: 544 [2021-12-21 09:44:13,572 INFO L226 Difference]: Without dead ends: 442 [2021-12-21 09:44:13,574 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1201 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=570, Invalid=3852, Unknown=0, NotChecked=0, Total=4422 [2021-12-21 09:44:13,574 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 455 mSDsluCounter, 1729 mSDsCounter, 0 mSdLazyCounter, 2123 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 463 SdHoareTripleChecker+Valid, 1820 SdHoareTripleChecker+Invalid, 2212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 2123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-12-21 09:44:13,574 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [463 Valid, 1820 Invalid, 2212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 2123 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-12-21 09:44:13,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2021-12-21 09:44:13,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 288. [2021-12-21 09:44:13,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 277 states have (on average 1.259927797833935) internal successors, (349), 278 states have internal predecessors, (349), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-21 09:44:13,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 362 transitions. [2021-12-21 09:44:13,694 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 362 transitions. Word has length 47 [2021-12-21 09:44:13,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:44:13,694 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 362 transitions. [2021-12-21 09:44:13,694 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.2115384615384617) internal successors, (115), 51 states have internal predecessors, (115), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:44:13,694 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 362 transitions. [2021-12-21 09:44:13,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-21 09:44:13,695 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:44:13,695 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:44:13,702 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-12-21 09:44:13,900 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:44:13,900 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:44:13,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:44:13,901 INFO L85 PathProgramCache]: Analyzing trace with hash -1577867576, now seen corresponding path program 2 times [2021-12-21 09:44:13,901 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:44:13,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897375367] [2021-12-21 09:44:13,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:44:13,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:44:13,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:44:14,143 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-21 09:44:14,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:44:14,153 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-12-21 09:44:14,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:44:14,173 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-21 09:44:14,173 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:44:14,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897375367] [2021-12-21 09:44:14,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [897375367] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:44:14,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [808198608] [2021-12-21 09:44:14,174 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 09:44:14,174 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:44:14,174 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:44:14,175 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:44:14,176 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-12-21 09:44:14,252 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 09:44:14,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:44:14,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 41 conjunts are in the unsatisfiable core [2021-12-21 09:44:14,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:44:14,436 INFO L353 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-21 09:44:14,436 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 10 [2021-12-21 09:44:14,465 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-21 09:44:14,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:44:14,598 INFO L353 Elim1Store]: treesize reduction 24, result has 76.0 percent of original size [2021-12-21 09:44:14,598 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 83 [2021-12-21 09:44:14,760 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-21 09:44:14,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [808198608] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:44:14,761 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:44:14,761 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 10] total 22 [2021-12-21 09:44:14,761 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087062520] [2021-12-21 09:44:14,761 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:44:14,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-21 09:44:14,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:44:14,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-21 09:44:14,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=372, Unknown=0, NotChecked=0, Total=462 [2021-12-21 09:44:14,762 INFO L87 Difference]: Start difference. First operand 288 states and 362 transitions. Second operand has 22 states, 20 states have (on average 3.85) internal successors, (77), 22 states have internal predecessors, (77), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 09:44:15,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:44:15,262 INFO L93 Difference]: Finished difference Result 431 states and 553 transitions. [2021-12-21 09:44:15,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-21 09:44:15,262 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 3.85) internal successors, (77), 22 states have internal predecessors, (77), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 51 [2021-12-21 09:44:15,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:44:15,263 INFO L225 Difference]: With dead ends: 431 [2021-12-21 09:44:15,263 INFO L226 Difference]: Without dead ends: 406 [2021-12-21 09:44:15,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=162, Invalid=594, Unknown=0, NotChecked=0, Total=756 [2021-12-21 09:44:15,264 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 319 mSDsluCounter, 405 mSDsCounter, 0 mSdLazyCounter, 330 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 327 SdHoareTripleChecker+Valid, 461 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 09:44:15,264 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [327 Valid, 461 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 330 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 09:44:15,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2021-12-21 09:44:15,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 304. [2021-12-21 09:44:15,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 291 states have (on average 1.2508591065292096) internal successors, (364), 292 states have internal predecessors, (364), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-21 09:44:15,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 381 transitions. [2021-12-21 09:44:15,398 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 381 transitions. Word has length 51 [2021-12-21 09:44:15,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:44:15,398 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 381 transitions. [2021-12-21 09:44:15,398 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 20 states have (on average 3.85) internal successors, (77), 22 states have internal predecessors, (77), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-21 09:44:15,398 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 381 transitions. [2021-12-21 09:44:15,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-21 09:44:15,399 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:44:15,399 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:44:15,415 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-12-21 09:44:15,606 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:44:15,606 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:44:15,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:44:15,607 INFO L85 PathProgramCache]: Analyzing trace with hash 933712923, now seen corresponding path program 2 times [2021-12-21 09:44:15,607 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:44:15,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1339053309] [2021-12-21 09:44:15,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:44:15,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:44:15,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:44:15,714 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-21 09:44:15,714 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:44:15,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1339053309] [2021-12-21 09:44:15,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1339053309] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:44:15,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1617129709] [2021-12-21 09:44:15,714 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 09:44:15,714 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:44:15,714 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:44:15,716 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:44:15,717 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-12-21 09:44:15,958 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 09:44:15,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 09:44:15,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 55 conjunts are in the unsatisfiable core [2021-12-21 09:44:15,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 09:44:16,286 INFO L353 Elim1Store]: treesize reduction 7, result has 56.3 percent of original size [2021-12-21 09:44:16,286 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 20 [2021-12-21 09:44:16,309 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 5 proven. 35 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-21 09:44:16,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 09:44:16,545 INFO L353 Elim1Store]: treesize reduction 26, result has 76.8 percent of original size [2021-12-21 09:44:16,545 INFO L387 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 93 [2021-12-21 09:44:17,018 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 5 proven. 19 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-21 09:44:17,018 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1617129709] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 09:44:17,018 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 09:44:17,019 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16, 12] total 31 [2021-12-21 09:44:17,019 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097037113] [2021-12-21 09:44:17,019 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 09:44:17,019 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-12-21 09:44:17,019 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 09:44:17,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-12-21 09:44:17,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=847, Unknown=0, NotChecked=0, Total=930 [2021-12-21 09:44:17,020 INFO L87 Difference]: Start difference. First operand 304 states and 381 transitions. Second operand has 31 states, 31 states have (on average 3.129032258064516) internal successors, (97), 31 states have internal predecessors, (97), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:44:21,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 09:44:21,014 INFO L93 Difference]: Finished difference Result 1169 states and 1535 transitions. [2021-12-21 09:44:21,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-12-21 09:44:21,015 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.129032258064516) internal successors, (97), 31 states have internal predecessors, (97), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-12-21 09:44:21,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 09:44:21,017 INFO L225 Difference]: With dead ends: 1169 [2021-12-21 09:44:21,017 INFO L226 Difference]: Without dead ends: 1014 [2021-12-21 09:44:21,018 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1351 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=764, Invalid=5556, Unknown=0, NotChecked=0, Total=6320 [2021-12-21 09:44:21,018 INFO L933 BasicCegarLoop]: 150 mSDtfsCounter, 961 mSDsluCounter, 2243 mSDsCounter, 0 mSdLazyCounter, 2618 mSolverCounterSat, 343 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 969 SdHoareTripleChecker+Valid, 2393 SdHoareTripleChecker+Invalid, 2961 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 343 IncrementalHoareTripleChecker+Valid, 2618 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-12-21 09:44:21,018 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [969 Valid, 2393 Invalid, 2961 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [343 Valid, 2618 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-12-21 09:44:21,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1014 states. [2021-12-21 09:44:21,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1014 to 445. [2021-12-21 09:44:21,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 432 states have (on average 1.2662037037037037) internal successors, (547), 433 states have internal predecessors, (547), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-21 09:44:21,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 564 transitions. [2021-12-21 09:44:21,227 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 564 transitions. Word has length 49 [2021-12-21 09:44:21,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 09:44:21,227 INFO L470 AbstractCegarLoop]: Abstraction has 445 states and 564 transitions. [2021-12-21 09:44:21,227 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 3.129032258064516) internal successors, (97), 31 states have internal predecessors, (97), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-21 09:44:21,227 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 564 transitions. [2021-12-21 09:44:21,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-12-21 09:44:21,228 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 09:44:21,228 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 09:44:21,245 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-12-21 09:44:21,432 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-12-21 09:44:21,432 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 09:44:21,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 09:44:21,432 INFO L85 PathProgramCache]: Analyzing trace with hash 832365819, now seen corresponding path program 1 times [2021-12-21 09:44:21,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 09:44:21,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433531826] [2021-12-21 09:44:21,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:44:21,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 09:44:21,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:44:21,703 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-12-21 09:44:21,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:44:21,706 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-12-21 09:44:21,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:44:21,710 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-21 09:44:21,710 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 09:44:21,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433531826] [2021-12-21 09:44:21,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1433531826] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 09:44:21,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380078096] [2021-12-21 09:44:21,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 09:44:21,711 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 09:44:21,711 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 09:44:21,712 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 09:44:21,739 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-12-21 09:44:21,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 09:44:21,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 45 conjunts are in the unsatisfiable core [2021-12-21 09:44:21,789 INFO L286 TraceCheckSpWp]: Computing forward predicates...