./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b 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/loops-crafted-1/nested_delay_nd.c -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 39463d01f5c85d47bf5e231172595e96b8ff556c59c4a9ab8cf46a88a393b05c --- Real Ultimate output --- This is Ultimate 0.2.2-839c364b5d67a0f615c82cb70ab247790648d4a9-839c364 [2021-12-14 13:54:51,757 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-14 13:54:51,759 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-14 13:54:51,793 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-14 13:54:51,794 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-14 13:54:51,796 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-14 13:54:51,797 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-14 13:54:51,800 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-14 13:54:51,801 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-14 13:54:51,804 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-14 13:54:51,805 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-14 13:54:51,806 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-14 13:54:51,806 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-14 13:54:51,808 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-14 13:54:51,809 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-14 13:54:51,814 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-14 13:54:51,815 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-14 13:54:51,816 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-14 13:54:51,817 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-14 13:54:51,820 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-14 13:54:51,821 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-14 13:54:51,822 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-14 13:54:51,823 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-14 13:54:51,824 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-14 13:54:51,827 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-14 13:54:51,830 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-14 13:54:51,830 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-14 13:54:51,831 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-14 13:54:51,832 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-14 13:54:51,833 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-14 13:54:51,833 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-14 13:54:51,833 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-14 13:54:51,835 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-14 13:54:51,835 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-14 13:54:51,836 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-14 13:54:51,837 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-14 13:54:51,837 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-14 13:54:51,838 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-14 13:54:51,839 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-14 13:54:51,839 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-14 13:54:51,840 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-14 13:54:51,840 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-14 13:54:51,860 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-14 13:54:51,861 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-14 13:54:51,861 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-14 13:54:51,861 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-14 13:54:51,862 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-14 13:54:51,862 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-14 13:54:51,863 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-14 13:54:51,863 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-14 13:54:51,863 INFO L138 SettingsManager]: * Use SBE=true [2021-12-14 13:54:51,863 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-14 13:54:51,864 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-14 13:54:51,864 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-14 13:54:51,864 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-14 13:54:51,864 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-14 13:54:51,864 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-14 13:54:51,865 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-14 13:54:51,865 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-14 13:54:51,865 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-14 13:54:51,865 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-14 13:54:51,865 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-14 13:54:51,865 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-14 13:54:51,865 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-14 13:54:51,866 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-14 13:54:51,866 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-14 13:54:51,866 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-14 13:54:51,866 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-14 13:54:51,866 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-14 13:54:51,867 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-14 13:54:51,867 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-14 13:54:51,867 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-14 13:54:51,867 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-14 13:54:51,867 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-14 13:54:51,868 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-14 13:54:51,868 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-14 13:54:51,868 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 39463d01f5c85d47bf5e231172595e96b8ff556c59c4a9ab8cf46a88a393b05c [2021-12-14 13:54:52,147 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-14 13:54:52,172 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-14 13:54:52,174 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-14 13:54:52,179 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-14 13:54:52,179 INFO L275 PluginConnector]: CDTParser initialized [2021-12-14 13:54:52,181 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c [2021-12-14 13:54:52,239 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1393f43f8/6dbf82dc4bc94d3f85f9c09bd3217433/FLAG3009e6ea6 [2021-12-14 13:54:52,802 INFO L306 CDTParser]: Found 1 translation units. [2021-12-14 13:54:52,803 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops-crafted-1/nested_delay_nd.c [2021-12-14 13:54:52,835 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1393f43f8/6dbf82dc4bc94d3f85f9c09bd3217433/FLAG3009e6ea6 [2021-12-14 13:54:53,214 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1393f43f8/6dbf82dc4bc94d3f85f9c09bd3217433 [2021-12-14 13:54:53,217 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-14 13:54:53,218 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-14 13:54:53,220 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-14 13:54:53,221 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-14 13:54:53,225 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-14 13:54:53,226 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:54:53" (1/1) ... [2021-12-14 13:54:53,226 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a6e9f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:54:53, skipping insertion in model container [2021-12-14 13:54:53,227 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:54:53" (1/1) ... [2021-12-14 13:54:53,234 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-14 13:54:53,258 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-14 13:54:53,405 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/loops-crafted-1/nested_delay_nd.c[465,478] [2021-12-14 13:54:53,444 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-14 13:54:53,473 INFO L203 MainTranslator]: Completed pre-run [2021-12-14 13:54:53,485 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/loops-crafted-1/nested_delay_nd.c[465,478] [2021-12-14 13:54:53,490 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-14 13:54:53,519 INFO L208 MainTranslator]: Completed translation [2021-12-14 13:54:53,520 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:54:53 WrapperNode [2021-12-14 13:54:53,520 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-14 13:54:53,522 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-14 13:54:53,522 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-14 13:54:53,522 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-14 13:54:53,528 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:54:53" (1/1) ... [2021-12-14 13:54:53,546 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:54:53" (1/1) ... [2021-12-14 13:54:53,590 INFO L137 Inliner]: procedures = 14, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 62 [2021-12-14 13:54:53,591 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-14 13:54:53,591 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-14 13:54:53,591 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-14 13:54:53,592 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-14 13:54:53,596 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:54:53" (1/1) ... [2021-12-14 13:54:53,596 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:54:53" (1/1) ... [2021-12-14 13:54:53,598 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:54:53" (1/1) ... [2021-12-14 13:54:53,598 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:54:53" (1/1) ... [2021-12-14 13:54:53,604 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:54:53" (1/1) ... [2021-12-14 13:54:53,606 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:54:53" (1/1) ... [2021-12-14 13:54:53,607 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:54:53" (1/1) ... [2021-12-14 13:54:53,608 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-14 13:54:53,609 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-14 13:54:53,609 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-14 13:54:53,609 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-14 13:54:53,609 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:54:53" (1/1) ... [2021-12-14 13:54:53,614 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-14 13:54:53,626 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:54:53,636 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) [2021-12-14 13:54:53,650 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 [2021-12-14 13:54:53,687 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-14 13:54:53,688 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-14 13:54:53,691 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-14 13:54:53,692 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-14 13:54:53,736 INFO L236 CfgBuilder]: Building ICFG [2021-12-14 13:54:53,737 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-14 13:54:53,901 INFO L277 CfgBuilder]: Performing block encoding [2021-12-14 13:54:53,905 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-14 13:54:53,906 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-12-14 13:54:53,907 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:54:53 BoogieIcfgContainer [2021-12-14 13:54:53,907 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-14 13:54:53,909 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-14 13:54:53,914 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-14 13:54:53,922 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-14 13:54:53,923 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 01:54:53" (1/3) ... [2021-12-14 13:54:53,923 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@170f817c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:54:53, skipping insertion in model container [2021-12-14 13:54:53,923 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:54:53" (2/3) ... [2021-12-14 13:54:53,924 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@170f817c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:54:53, skipping insertion in model container [2021-12-14 13:54:53,924 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:54:53" (3/3) ... [2021-12-14 13:54:53,925 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_delay_nd.c [2021-12-14 13:54:53,928 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-14 13:54:53,929 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-14 13:54:53,983 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-14 13:54:54,004 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 [2021-12-14 13:54:54,005 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-14 13:54:54,016 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 19 states have (on average 1.631578947368421) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:54,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-12-14 13:54:54,029 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:54:54,030 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:54:54,031 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:54:54,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:54:54,038 INFO L85 PathProgramCache]: Analyzing trace with hash -493598204, now seen corresponding path program 1 times [2021-12-14 13:54:54,044 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:54:54,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428724501] [2021-12-14 13:54:54,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:54:54,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:54:54,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:54:54,189 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:54:54,190 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:54:54,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428724501] [2021-12-14 13:54:54,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428724501] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 13:54:54,191 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 13:54:54,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-14 13:54:54,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369032749] [2021-12-14 13:54:54,193 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 13:54:54,196 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-14 13:54:54,196 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:54:54,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-14 13:54:54,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-14 13:54:54,222 INFO L87 Difference]: Start difference. First operand has 21 states, 19 states have (on average 1.631578947368421) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:54,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:54:54,233 INFO L93 Difference]: Finished difference Result 35 states and 55 transitions. [2021-12-14 13:54:54,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-14 13:54:54,234 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-12-14 13:54:54,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:54:54,239 INFO L225 Difference]: With dead ends: 35 [2021-12-14 13:54:54,239 INFO L226 Difference]: Without dead ends: 17 [2021-12-14 13:54:54,242 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-14 13:54:54,246 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:54:54,247 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:54:54,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-12-14 13:54:54,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-12-14 13:54:54,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.4375) internal successors, (23), 16 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:54,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 23 transitions. [2021-12-14 13:54:54,272 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 23 transitions. Word has length 12 [2021-12-14 13:54:54,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:54:54,273 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 23 transitions. [2021-12-14 13:54:54,273 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:54,273 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 23 transitions. [2021-12-14 13:54:54,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-12-14 13:54:54,274 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:54:54,274 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:54:54,274 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-14 13:54:54,275 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:54:54,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:54:54,278 INFO L85 PathProgramCache]: Analyzing trace with hash -2059231113, now seen corresponding path program 1 times [2021-12-14 13:54:54,278 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:54:54,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180764562] [2021-12-14 13:54:54,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:54:54,279 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:54:54,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:54:54,375 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:54:54,375 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:54:54,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1180764562] [2021-12-14 13:54:54,376 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1180764562] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 13:54:54,376 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 13:54:54,376 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-14 13:54:54,376 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129604472] [2021-12-14 13:54:54,377 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 13:54:54,377 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-14 13:54:54,378 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:54:54,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-14 13:54:54,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-14 13:54:54,380 INFO L87 Difference]: Start difference. First operand 17 states and 23 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:54,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:54:54,426 INFO L93 Difference]: Finished difference Result 34 states and 48 transitions. [2021-12-14 13:54:54,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-14 13:54:54,427 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-12-14 13:54:54,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:54:54,428 INFO L225 Difference]: With dead ends: 34 [2021-12-14 13:54:54,428 INFO L226 Difference]: Without dead ends: 21 [2021-12-14 13:54:54,431 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-14 13:54:54,432 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 26 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:54:54,433 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 18 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:54:54,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-12-14 13:54:54,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2021-12-14 13:54:54,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:54,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 24 transitions. [2021-12-14 13:54:54,440 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 24 transitions. Word has length 12 [2021-12-14 13:54:54,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:54:54,441 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 24 transitions. [2021-12-14 13:54:54,441 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:54,441 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 24 transitions. [2021-12-14 13:54:54,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-12-14 13:54:54,442 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:54:54,443 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:54:54,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-14 13:54:54,446 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:54:54,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:54:54,446 INFO L85 PathProgramCache]: Analyzing trace with hash 573171571, now seen corresponding path program 1 times [2021-12-14 13:54:54,447 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:54:54,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2022502418] [2021-12-14 13:54:54,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:54:54,447 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:54:54,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:54:54,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-14 13:54:54,478 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:54:54,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2022502418] [2021-12-14 13:54:54,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2022502418] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 13:54:54,479 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 13:54:54,479 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-14 13:54:54,479 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980600518] [2021-12-14 13:54:54,479 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 13:54:54,480 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-14 13:54:54,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:54:54,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-14 13:54:54,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-14 13:54:54,481 INFO L87 Difference]: Start difference. First operand 18 states and 24 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:54,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:54:54,504 INFO L93 Difference]: Finished difference Result 41 states and 56 transitions. [2021-12-14 13:54:54,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-14 13:54:54,505 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-12-14 13:54:54,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:54:54,505 INFO L225 Difference]: With dead ends: 41 [2021-12-14 13:54:54,505 INFO L226 Difference]: Without dead ends: 27 [2021-12-14 13:54:54,506 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 [2021-12-14 13:54:54,506 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 10 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:54:54,507 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 34 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:54:54,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-12-14 13:54:54,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 19. [2021-12-14 13:54:54,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 18 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:54,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 25 transitions. [2021-12-14 13:54:54,510 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 25 transitions. Word has length 15 [2021-12-14 13:54:54,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:54:54,510 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 25 transitions. [2021-12-14 13:54:54,510 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:54,510 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 25 transitions. [2021-12-14 13:54:54,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-12-14 13:54:54,511 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:54:54,511 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:54:54,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-14 13:54:54,511 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:54:54,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:54:54,512 INFO L85 PathProgramCache]: Analyzing trace with hash 630429873, now seen corresponding path program 1 times [2021-12-14 13:54:54,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:54:54,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820384612] [2021-12-14 13:54:54,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:54:54,512 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:54:54,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:54:54,556 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-14 13:54:54,556 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:54:54,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820384612] [2021-12-14 13:54:54,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1820384612] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 13:54:54,556 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 13:54:54,557 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-14 13:54:54,557 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815817503] [2021-12-14 13:54:54,557 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 13:54:54,557 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-14 13:54:54,557 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:54:54,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-14 13:54:54,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-14 13:54:54,558 INFO L87 Difference]: Start difference. First operand 19 states and 25 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:54,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:54:54,576 INFO L93 Difference]: Finished difference Result 49 states and 67 transitions. [2021-12-14 13:54:54,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-14 13:54:54,576 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-12-14 13:54:54,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:54:54,578 INFO L225 Difference]: With dead ends: 49 [2021-12-14 13:54:54,578 INFO L226 Difference]: Without dead ends: 34 [2021-12-14 13:54:54,578 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-14 13:54:54,579 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 47 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:54:54,579 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 29 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:54:54,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-12-14 13:54:54,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2021-12-14 13:54:54,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.4193548387096775) internal successors, (44), 31 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:54,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 44 transitions. [2021-12-14 13:54:54,584 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 44 transitions. Word has length 15 [2021-12-14 13:54:54,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:54:54,584 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 44 transitions. [2021-12-14 13:54:54,584 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:54,584 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 44 transitions. [2021-12-14 13:54:54,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-12-14 13:54:54,585 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:54:54,585 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:54:54,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-14 13:54:54,585 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:54:54,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:54:54,586 INFO L85 PathProgramCache]: Analyzing trace with hash 630489455, now seen corresponding path program 1 times [2021-12-14 13:54:54,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:54:54,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549266469] [2021-12-14 13:54:54,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:54:54,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:54:54,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:54:54,618 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:54:54,622 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:54:54,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549266469] [2021-12-14 13:54:54,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549266469] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:54:54,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701947641] [2021-12-14 13:54:54,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:54:54,623 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:54:54,623 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:54:54,625 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) [2021-12-14 13:54:54,626 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-14 13:54:54,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:54:54,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-14 13:54:54,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:54:54,766 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:54:54,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:54:54,806 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:54:54,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [701947641] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:54:54,807 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:54:54,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2021-12-14 13:54:54,807 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564556600] [2021-12-14 13:54:54,807 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:54:54,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-14 13:54:54,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:54:54,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-14 13:54:54,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=51, Unknown=0, NotChecked=0, Total=90 [2021-12-14 13:54:54,809 INFO L87 Difference]: Start difference. First operand 32 states and 44 transitions. Second operand has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:54,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:54:54,859 INFO L93 Difference]: Finished difference Result 79 states and 115 transitions. [2021-12-14 13:54:54,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-14 13:54:54,859 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-12-14 13:54:54,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:54:54,860 INFO L225 Difference]: With dead ends: 79 [2021-12-14 13:54:54,860 INFO L226 Difference]: Without dead ends: 51 [2021-12-14 13:54:54,860 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-12-14 13:54:54,861 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 41 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:54:54,861 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 18 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:54:54,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-12-14 13:54:54,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2021-12-14 13:54:54,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.3877551020408163) internal successors, (68), 49 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:54,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 68 transitions. [2021-12-14 13:54:54,866 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 68 transitions. Word has length 15 [2021-12-14 13:54:54,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:54:54,867 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 68 transitions. [2021-12-14 13:54:54,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:54,867 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 68 transitions. [2021-12-14 13:54:54,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-14 13:54:54,868 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:54:54,868 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:54:54,886 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-14 13:54:55,083 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:54:55,084 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:54:55,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:54:55,084 INFO L85 PathProgramCache]: Analyzing trace with hash -901646477, now seen corresponding path program 2 times [2021-12-14 13:54:55,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:54:55,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [450750459] [2021-12-14 13:54:55,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:54:55,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:54:55,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:54:55,138 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:54:55,138 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:54:55,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [450750459] [2021-12-14 13:54:55,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [450750459] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:54:55,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [829003903] [2021-12-14 13:54:55,139 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 13:54:55,139 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:54:55,139 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:54:55,140 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) [2021-12-14 13:54:55,141 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-14 13:54:55,178 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 13:54:55,179 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:54:55,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-14 13:54:55,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:54:55,424 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-14 13:54:55,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:54:55,743 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-14 13:54:55,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [829003903] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:54:55,744 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:54:55,744 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 14 [2021-12-14 13:54:55,744 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784552190] [2021-12-14 13:54:55,744 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:54:55,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-14 13:54:55,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:54:55,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-14 13:54:55,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2021-12-14 13:54:55,745 INFO L87 Difference]: Start difference. First operand 50 states and 68 transitions. Second operand has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:56,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:54:56,290 INFO L93 Difference]: Finished difference Result 210 states and 294 transitions. [2021-12-14 13:54:56,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-14 13:54:56,291 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-12-14 13:54:56,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:54:56,292 INFO L225 Difference]: With dead ends: 210 [2021-12-14 13:54:56,292 INFO L226 Difference]: Without dead ends: 164 [2021-12-14 13:54:56,293 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=381, Invalid=951, Unknown=0, NotChecked=0, Total=1332 [2021-12-14 13:54:56,300 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 284 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-14 13:54:56,301 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [284 Valid, 70 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-14 13:54:56,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-12-14 13:54:56,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 142. [2021-12-14 13:54:56,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 141 states have (on average 1.2765957446808511) internal successors, (180), 141 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:56,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 180 transitions. [2021-12-14 13:54:56,331 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 180 transitions. Word has length 24 [2021-12-14 13:54:56,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:54:56,345 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 180 transitions. [2021-12-14 13:54:56,346 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.066666666666667) internal successors, (46), 14 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:56,346 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 180 transitions. [2021-12-14 13:54:56,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-14 13:54:56,347 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:54:56,347 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:54:56,371 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-12-14 13:54:56,563 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 [2021-12-14 13:54:56,564 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:54:56,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:54:56,564 INFO L85 PathProgramCache]: Analyzing trace with hash 1843449907, now seen corresponding path program 1 times [2021-12-14 13:54:56,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:54:56,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572620816] [2021-12-14 13:54:56,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:54:56,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:54:56,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:54:56,638 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-12-14 13:54:56,638 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:54:56,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572620816] [2021-12-14 13:54:56,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1572620816] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 13:54:56,638 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 13:54:56,638 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-14 13:54:56,638 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028129924] [2021-12-14 13:54:56,639 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 13:54:56,639 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-14 13:54:56,639 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:54:56,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-14 13:54:56,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-14 13:54:56,640 INFO L87 Difference]: Start difference. First operand 142 states and 180 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:56,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:54:56,665 INFO L93 Difference]: Finished difference Result 331 states and 425 transitions. [2021-12-14 13:54:56,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-14 13:54:56,665 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-12-14 13:54:56,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:54:56,667 INFO L225 Difference]: With dead ends: 331 [2021-12-14 13:54:56,669 INFO L226 Difference]: Without dead ends: 193 [2021-12-14 13:54:56,670 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 [2021-12-14 13:54:56,671 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 9 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:54:56,672 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 38 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:54:56,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-12-14 13:54:56,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 144. [2021-12-14 13:54:56,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.2657342657342658) internal successors, (181), 143 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:56,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 181 transitions. [2021-12-14 13:54:56,692 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 181 transitions. Word has length 30 [2021-12-14 13:54:56,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:54:56,692 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 181 transitions. [2021-12-14 13:54:56,693 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:56,693 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 181 transitions. [2021-12-14 13:54:56,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-14 13:54:56,696 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:54:56,696 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:54:56,696 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-12-14 13:54:56,696 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:54:56,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:54:56,697 INFO L85 PathProgramCache]: Analyzing trace with hash 397594855, now seen corresponding path program 1 times [2021-12-14 13:54:56,697 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:54:56,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [946005907] [2021-12-14 13:54:56,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:54:56,698 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:54:56,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:54:56,719 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-12-14 13:54:56,719 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:54:56,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [946005907] [2021-12-14 13:54:56,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [946005907] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 13:54:56,719 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 13:54:56,719 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-14 13:54:56,720 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578294106] [2021-12-14 13:54:56,720 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 13:54:56,720 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-14 13:54:56,720 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:54:56,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-14 13:54:56,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-14 13:54:56,721 INFO L87 Difference]: Start difference. First operand 144 states and 181 transitions. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:56,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:54:56,743 INFO L93 Difference]: Finished difference Result 231 states and 291 transitions. [2021-12-14 13:54:56,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-14 13:54:56,744 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-12-14 13:54:56,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:54:56,744 INFO L225 Difference]: With dead ends: 231 [2021-12-14 13:54:56,745 INFO L226 Difference]: Without dead ends: 160 [2021-12-14 13:54:56,745 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 [2021-12-14 13:54:56,745 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 11 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:54:56,746 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 35 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:54:56,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-12-14 13:54:56,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 148. [2021-12-14 13:54:56,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 147 states have (on average 1.2448979591836735) internal successors, (183), 147 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:56,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 183 transitions. [2021-12-14 13:54:56,771 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 183 transitions. Word has length 31 [2021-12-14 13:54:56,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:54:56,771 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 183 transitions. [2021-12-14 13:54:56,771 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:56,771 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 183 transitions. [2021-12-14 13:54:56,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-14 13:54:56,772 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:54:56,772 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:54:56,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-12-14 13:54:56,772 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:54:56,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:54:56,773 INFO L85 PathProgramCache]: Analyzing trace with hash 399501479, now seen corresponding path program 1 times [2021-12-14 13:54:56,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:54:56,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535120119] [2021-12-14 13:54:56,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:54:56,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:54:56,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:54:56,962 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:54:56,962 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:54:56,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535120119] [2021-12-14 13:54:56,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535120119] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:54:56,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1678998012] [2021-12-14 13:54:56,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:54:56,963 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:54:56,963 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:54:56,965 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) [2021-12-14 13:54:56,965 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-14 13:54:57,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:54:57,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-14 13:54:57,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:54:57,181 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:54:57,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:54:57,320 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:54:57,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1678998012] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:54:57,320 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:54:57,320 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 24 [2021-12-14 13:54:57,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844682399] [2021-12-14 13:54:57,321 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:54:57,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-12-14 13:54:57,321 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:54:57,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-12-14 13:54:57,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=341, Unknown=0, NotChecked=0, Total=600 [2021-12-14 13:54:57,322 INFO L87 Difference]: Start difference. First operand 148 states and 183 transitions. Second operand has 25 states, 25 states have (on average 3.0) internal successors, (75), 24 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:57,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:54:57,496 INFO L93 Difference]: Finished difference Result 437 states and 587 transitions. [2021-12-14 13:54:57,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-14 13:54:57,496 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.0) internal successors, (75), 24 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-12-14 13:54:57,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:54:57,497 INFO L225 Difference]: With dead ends: 437 [2021-12-14 13:54:57,498 INFO L226 Difference]: Without dead ends: 293 [2021-12-14 13:54:57,498 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=392, Invalid=600, Unknown=0, NotChecked=0, Total=992 [2021-12-14 13:54:57,499 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 177 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 13:54:57,499 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [177 Valid, 32 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-14 13:54:57,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2021-12-14 13:54:57,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 292. [2021-12-14 13:54:57,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 291 states have (on average 1.2336769759450172) internal successors, (359), 291 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:57,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 359 transitions. [2021-12-14 13:54:57,517 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 359 transitions. Word has length 31 [2021-12-14 13:54:57,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:54:57,518 INFO L470 AbstractCegarLoop]: Abstraction has 292 states and 359 transitions. [2021-12-14 13:54:57,518 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.0) internal successors, (75), 24 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:54:57,518 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 359 transitions. [2021-12-14 13:54:57,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-12-14 13:54:57,519 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:54:57,519 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:54:57,537 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-14 13:54:57,740 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:54:57,741 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:54:57,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:54:57,744 INFO L85 PathProgramCache]: Analyzing trace with hash -871125337, now seen corresponding path program 2 times [2021-12-14 13:54:57,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:54:57,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1321123100] [2021-12-14 13:54:57,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:54:57,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:54:57,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:54:58,041 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 0 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:54:58,042 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:54:58,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1321123100] [2021-12-14 13:54:58,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1321123100] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:54:58,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1349881723] [2021-12-14 13:54:58,042 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 13:54:58,042 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:54:58,042 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:54:58,044 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) [2021-12-14 13:54:58,078 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-14 13:54:58,096 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 13:54:58,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:54:58,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-14 13:54:58,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:54:58,618 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 0 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:54:58,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:54:59,302 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 0 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:54:59,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1349881723] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:54:59,303 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:54:59,303 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 48 [2021-12-14 13:54:59,303 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860730385] [2021-12-14 13:54:59,303 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:54:59,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-12-14 13:54:59,304 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:54:59,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-12-14 13:54:59,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1027, Invalid=1325, Unknown=0, NotChecked=0, Total=2352 [2021-12-14 13:54:59,305 INFO L87 Difference]: Start difference. First operand 292 states and 359 transitions. Second operand has 49 states, 49 states have (on average 3.0) internal successors, (147), 48 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:55:00,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:55:00,114 INFO L93 Difference]: Finished difference Result 869 states and 1163 transitions. [2021-12-14 13:55:00,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-12-14 13:55:00,115 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.0) internal successors, (147), 48 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-12-14 13:55:00,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:55:00,119 INFO L225 Difference]: With dead ends: 869 [2021-12-14 13:55:00,125 INFO L226 Difference]: Without dead ends: 581 [2021-12-14 13:55:00,128 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1377 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1552, Invalid=2480, Unknown=0, NotChecked=0, Total=4032 [2021-12-14 13:55:00,131 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 381 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 381 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-14 13:55:00,132 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [381 Valid, 27 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-14 13:55:00,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 581 states. [2021-12-14 13:55:00,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 581 to 580. [2021-12-14 13:55:00,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 580 states, 579 states have (on average 1.2279792746113989) internal successors, (711), 579 states have internal predecessors, (711), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:55:00,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 580 states to 580 states and 711 transitions. [2021-12-14 13:55:00,172 INFO L78 Accepts]: Start accepts. Automaton has 580 states and 711 transitions. Word has length 55 [2021-12-14 13:55:00,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:55:00,172 INFO L470 AbstractCegarLoop]: Abstraction has 580 states and 711 transitions. [2021-12-14 13:55:00,172 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 3.0) internal successors, (147), 48 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:55:00,172 INFO L276 IsEmpty]: Start isEmpty. Operand 580 states and 711 transitions. [2021-12-14 13:55:00,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-12-14 13:55:00,174 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:55:00,174 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:55:00,209 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-14 13:55:00,374 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:55:00,374 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:55:00,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:55:00,375 INFO L85 PathProgramCache]: Analyzing trace with hash 1917139623, now seen corresponding path program 3 times [2021-12-14 13:55:00,375 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:55:00,375 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1872657500] [2021-12-14 13:55:00,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:55:00,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:55:00,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:55:00,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 0 proven. 1335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:55:00,993 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:55:00,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1872657500] [2021-12-14 13:55:00,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1872657500] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:55:00,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [345349000] [2021-12-14 13:55:00,994 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 13:55:00,994 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:55:00,994 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:55:00,995 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) [2021-12-14 13:55:01,018 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-14 13:55:01,051 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-14 13:55:01,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:55:01,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-14 13:55:01,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:55:01,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2021-12-14 13:55:01,247 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-14 13:55:01,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [345349000] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 13:55:01,247 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-14 13:55:01,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [33] total 37 [2021-12-14 13:55:01,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187051921] [2021-12-14 13:55:01,247 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 13:55:01,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-14 13:55:01,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:55:01,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-14 13:55:01,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=794, Unknown=0, NotChecked=0, Total=1332 [2021-12-14 13:55:01,249 INFO L87 Difference]: Start difference. First operand 580 states and 711 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:55:01,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:55:01,315 INFO L93 Difference]: Finished difference Result 583 states and 713 transitions. [2021-12-14 13:55:01,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-14 13:55:01,315 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2021-12-14 13:55:01,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:55:01,316 INFO L225 Difference]: With dead ends: 583 [2021-12-14 13:55:01,316 INFO L226 Difference]: Without dead ends: 383 [2021-12-14 13:55:01,317 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=548, Invalid=934, Unknown=0, NotChecked=0, Total=1482 [2021-12-14 13:55:01,318 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 45 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:55:01,318 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 18 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:55:01,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2021-12-14 13:55:01,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 382. [2021-12-14 13:55:01,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 381 states have (on average 1.3280839895013123) internal successors, (506), 381 states have internal predecessors, (506), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:55:01,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 506 transitions. [2021-12-14 13:55:01,327 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 506 transitions. Word has length 103 [2021-12-14 13:55:01,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:55:01,327 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 506 transitions. [2021-12-14 13:55:01,328 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:55:01,328 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 506 transitions. [2021-12-14 13:55:01,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-12-14 13:55:01,328 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:55:01,329 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:55:01,345 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-12-14 13:55:01,545 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,SelfDestructingSolverStorable10 [2021-12-14 13:55:01,545 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:55:01,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:55:01,546 INFO L85 PathProgramCache]: Analyzing trace with hash 1743203367, now seen corresponding path program 1 times [2021-12-14 13:55:01,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:55:01,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1498605180] [2021-12-14 13:55:01,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:55:01,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:55:01,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:55:02,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 0 proven. 1335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:55:02,084 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:55:02,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1498605180] [2021-12-14 13:55:02,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1498605180] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:55:02,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699064847] [2021-12-14 13:55:02,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:55:02,085 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:55:02,085 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:55:02,085 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) [2021-12-14 13:55:02,086 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-14 13:55:02,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:55:02,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 33 conjunts are in the unsatisfiable core [2021-12-14 13:55:02,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:55:03,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 0 proven. 1335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:55:03,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:55:04,206 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 0 proven. 1335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:55:04,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699064847] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:55:04,206 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:55:04,207 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 96 [2021-12-14 13:55:04,207 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210137979] [2021-12-14 13:55:04,207 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:55:04,207 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-12-14 13:55:04,207 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:55:04,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-12-14 13:55:04,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4099, Invalid=5213, Unknown=0, NotChecked=0, Total=9312 [2021-12-14 13:55:04,210 INFO L87 Difference]: Start difference. First operand 382 states and 506 transitions. Second operand has 97 states, 97 states have (on average 3.0) internal successors, (291), 96 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:55:05,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:55:05,563 INFO L93 Difference]: Finished difference Result 1145 states and 1649 transitions. [2021-12-14 13:55:05,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-12-14 13:55:05,564 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 3.0) internal successors, (291), 96 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2021-12-14 13:55:05,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:55:05,566 INFO L225 Difference]: With dead ends: 1145 [2021-12-14 13:55:05,566 INFO L226 Difference]: Without dead ends: 767 [2021-12-14 13:55:05,569 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5825 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=6176, Invalid=10080, Unknown=0, NotChecked=0, Total=16256 [2021-12-14 13:55:05,569 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 624 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 415 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 624 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 415 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-14 13:55:05,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [624 Valid, 52 Invalid, 525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 415 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-14 13:55:05,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 767 states. [2021-12-14 13:55:05,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 767 to 766. [2021-12-14 13:55:05,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 766 states, 765 states have (on average 1.330718954248366) internal successors, (1018), 765 states have internal predecessors, (1018), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:55:05,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 766 states to 766 states and 1018 transitions. [2021-12-14 13:55:05,585 INFO L78 Accepts]: Start accepts. Automaton has 766 states and 1018 transitions. Word has length 103 [2021-12-14 13:55:05,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:55:05,586 INFO L470 AbstractCegarLoop]: Abstraction has 766 states and 1018 transitions. [2021-12-14 13:55:05,587 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 3.0) internal successors, (291), 96 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:55:05,587 INFO L276 IsEmpty]: Start isEmpty. Operand 766 states and 1018 transitions. [2021-12-14 13:55:05,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2021-12-14 13:55:05,588 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:55:05,588 INFO L514 BasicCegarLoop]: trace histogram [62, 62, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:55:05,627 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-12-14 13:55:05,828 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:55:05,828 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:55:05,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:55:05,829 INFO L85 PathProgramCache]: Analyzing trace with hash -1216304089, now seen corresponding path program 2 times [2021-12-14 13:55:05,829 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:55:05,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733937481] [2021-12-14 13:55:05,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:55:05,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:55:05,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:55:07,374 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 0 proven. 5735 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:55:07,374 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:55:07,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733937481] [2021-12-14 13:55:07,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733937481] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:55:07,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59615155] [2021-12-14 13:55:07,375 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 13:55:07,375 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:55:07,375 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:55:07,376 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) [2021-12-14 13:55:07,380 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-14 13:55:07,492 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 13:55:07,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:55:07,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-14 13:55:07,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:55:08,208 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 0 proven. 305 refuted. 0 times theorem prover too weak. 5430 trivial. 0 not checked. [2021-12-14 13:55:08,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:55:08,611 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 0 proven. 305 refuted. 0 times theorem prover too weak. 5430 trivial. 0 not checked. [2021-12-14 13:55:08,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [59615155] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:55:08,612 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:55:08,612 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 6, 6] total 74 [2021-12-14 13:55:08,612 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982262494] [2021-12-14 13:55:08,612 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:55:08,613 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2021-12-14 13:55:08,613 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:55:08,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-12-14 13:55:08,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2369, Invalid=3181, Unknown=0, NotChecked=0, Total=5550 [2021-12-14 13:55:08,615 INFO L87 Difference]: Start difference. First operand 766 states and 1018 transitions. Second operand has 75 states, 75 states have (on average 3.0) internal successors, (225), 74 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:55:16,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:55:16,409 INFO L93 Difference]: Finished difference Result 13975 states and 18691 transitions. [2021-12-14 13:55:16,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 203 states. [2021-12-14 13:55:16,410 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 3.0) internal successors, (225), 74 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 199 [2021-12-14 13:55:16,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:55:16,444 INFO L225 Difference]: With dead ends: 13975 [2021-12-14 13:55:16,444 INFO L226 Difference]: Without dead ends: 13213 [2021-12-14 13:55:16,456 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 388 SyntacticMatches, 0 SemanticMatches, 270 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20539 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=22797, Invalid=50915, Unknown=0, NotChecked=0, Total=73712 [2021-12-14 13:55:16,458 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 2364 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 431 mSolverCounterSat, 907 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2364 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 1338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 907 IncrementalHoareTripleChecker+Valid, 431 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-14 13:55:16,458 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2364 Valid, 55 Invalid, 1338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [907 Valid, 431 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-14 13:55:16,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13213 states. [2021-12-14 13:55:16,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13213 to 1244. [2021-12-14 13:55:16,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1244 states, 1243 states have (on average 1.3290426387771521) internal successors, (1652), 1243 states have internal predecessors, (1652), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:55:16,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1244 states to 1244 states and 1652 transitions. [2021-12-14 13:55:16,598 INFO L78 Accepts]: Start accepts. Automaton has 1244 states and 1652 transitions. Word has length 199 [2021-12-14 13:55:16,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:55:16,599 INFO L470 AbstractCegarLoop]: Abstraction has 1244 states and 1652 transitions. [2021-12-14 13:55:16,599 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 3.0) internal successors, (225), 74 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:55:16,599 INFO L276 IsEmpty]: Start isEmpty. Operand 1244 states and 1652 transitions. [2021-12-14 13:55:16,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2021-12-14 13:55:16,601 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:55:16,601 INFO L514 BasicCegarLoop]: trace histogram [65, 65, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:55:16,619 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-14 13:55:16,815 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 [2021-12-14 13:55:16,816 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:55:16,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:55:16,816 INFO L85 PathProgramCache]: Analyzing trace with hash 818921193, now seen corresponding path program 1 times [2021-12-14 13:55:16,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:55:16,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286437600] [2021-12-14 13:55:16,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:55:16,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:55:16,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:55:18,331 INFO L134 CoverageAnalysis]: Checked inductivity of 6305 backedges. 0 proven. 6305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:55:18,331 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:55:18,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286437600] [2021-12-14 13:55:18,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1286437600] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:55:18,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758607232] [2021-12-14 13:55:18,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:55:18,332 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:55:18,332 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:55:18,333 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) [2021-12-14 13:55:18,338 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-14 13:55:18,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:55:18,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 68 conjunts are in the unsatisfiable core [2021-12-14 13:55:18,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:55:20,490 INFO L134 CoverageAnalysis]: Checked inductivity of 6305 backedges. 0 proven. 6305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:55:20,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:55:24,497 INFO L134 CoverageAnalysis]: Checked inductivity of 6305 backedges. 0 proven. 6305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:55:24,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [758607232] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:55:24,498 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:55:24,498 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 201 [2021-12-14 13:55:24,498 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69774084] [2021-12-14 13:55:24,498 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:55:24,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 202 states [2021-12-14 13:55:24,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:55:24,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 202 interpolants. [2021-12-14 13:55:24,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17959, Invalid=22643, Unknown=0, NotChecked=0, Total=40602 [2021-12-14 13:55:24,507 INFO L87 Difference]: Start difference. First operand 1244 states and 1652 transitions. Second operand has 202 states, 202 states have (on average 3.0) internal successors, (606), 201 states have internal predecessors, (606), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:55:34,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:55:34,166 INFO L93 Difference]: Finished difference Result 42301 states and 56655 transitions. [2021-12-14 13:55:34,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2021-12-14 13:55:34,167 INFO L78 Accepts]: Start accepts. Automaton has has 202 states, 202 states have (on average 3.0) internal successors, (606), 201 states have internal predecessors, (606), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 208 [2021-12-14 13:55:34,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:55:34,275 INFO L225 Difference]: With dead ends: 42301 [2021-12-14 13:55:34,275 INFO L226 Difference]: Without dead ends: 41061 [2021-12-14 13:55:34,288 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 282 SyntacticMatches, 0 SemanticMatches, 266 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26265 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=27001, Invalid=44555, Unknown=0, NotChecked=0, Total=71556 [2021-12-14 13:55:34,289 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 1235 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 775 mSolverCounterSat, 218 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1235 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 993 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 775 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-14 13:55:34,289 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1235 Valid, 52 Invalid, 993 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 775 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-14 13:55:34,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41061 states. [2021-12-14 13:55:35,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41061 to 2842. [2021-12-14 13:55:35,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2842 states, 2841 states have (on average 1.33051742344245) internal successors, (3780), 2841 states have internal predecessors, (3780), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:55:35,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2842 states to 2842 states and 3780 transitions. [2021-12-14 13:55:35,842 INFO L78 Accepts]: Start accepts. Automaton has 2842 states and 3780 transitions. Word has length 208 [2021-12-14 13:55:35,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:55:35,842 INFO L470 AbstractCegarLoop]: Abstraction has 2842 states and 3780 transitions. [2021-12-14 13:55:35,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 202 states, 202 states have (on average 3.0) internal successors, (606), 201 states have internal predecessors, (606), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-14 13:55:35,843 INFO L276 IsEmpty]: Start isEmpty. Operand 2842 states and 3780 transitions. [2021-12-14 13:55:35,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2021-12-14 13:55:35,851 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:55:35,852 INFO L514 BasicCegarLoop]: trace histogram [132, 132, 131, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:55:35,868 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-14 13:55:36,068 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 [2021-12-14 13:55:36,068 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:55:36,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:55:36,069 INFO L85 PathProgramCache]: Analyzing trace with hash 692841129, now seen corresponding path program 2 times [2021-12-14 13:55:36,069 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:55:36,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1305536344] [2021-12-14 13:55:36,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:55:36,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:55:36,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:55:40,869 INFO L134 CoverageAnalysis]: Checked inductivity of 26070 backedges. 0 proven. 26070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:55:40,870 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:55:40,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1305536344] [2021-12-14 13:55:40,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1305536344] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:55:40,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1348306967] [2021-12-14 13:55:40,870 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 13:55:40,870 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:55:40,871 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:55:40,871 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) [2021-12-14 13:55:40,872 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-14 13:55:40,987 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 13:55:40,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:55:40,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 856 conjuncts, 135 conjunts are in the unsatisfiable core [2021-12-14 13:55:40,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:55:47,676 INFO L134 CoverageAnalysis]: Checked inductivity of 26070 backedges. 0 proven. 26070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:55:47,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:56:02,222 INFO L134 CoverageAnalysis]: Checked inductivity of 26070 backedges. 0 proven. 26070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 13:56:02,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1348306967] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:56:02,223 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:56:02,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [135, 135, 135] total 402 [2021-12-14 13:56:02,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460628054] [2021-12-14 13:56:02,223 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:56:02,224 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 403 states [2021-12-14 13:56:02,224 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:56:02,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 403 interpolants. [2021-12-14 13:56:02,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71827, Invalid=90179, Unknown=0, NotChecked=0, Total=162006 [2021-12-14 13:56:02,241 INFO L87 Difference]: Start difference. First operand 2842 states and 3780 transitions. Second operand has 403 states, 403 states have (on average 3.0) internal successors, (1209), 402 states have internal predecessors, (1209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)