./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loop-invgen/seq-3.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version ff03de63 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/loop-invgen/seq-3.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 6c770a3141edeab927df0da4e8c2152e1fb2e87b0c43a352500a7e3d3cff4533 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-ff03de6 [2021-12-21 12:19:24,890 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-21 12:19:24,893 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-21 12:19:24,964 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-21 12:19:24,964 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-21 12:19:24,967 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-21 12:19:24,968 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-21 12:19:24,970 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-21 12:19:24,971 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-21 12:19:24,975 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-21 12:19:24,975 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-21 12:19:24,976 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-21 12:19:24,977 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-21 12:19:24,978 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-21 12:19:24,979 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-21 12:19:24,981 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-21 12:19:24,983 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-21 12:19:24,983 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-21 12:19:24,985 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-21 12:19:24,989 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-21 12:19:24,990 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-21 12:19:24,991 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-21 12:19:24,992 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-21 12:19:24,993 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-21 12:19:25,004 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-21 12:19:25,004 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-21 12:19:25,004 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-21 12:19:25,005 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-21 12:19:25,005 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-21 12:19:25,005 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-21 12:19:25,006 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-21 12:19:25,006 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-21 12:19:25,006 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-21 12:19:25,007 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-21 12:19:25,007 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-21 12:19:25,007 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-21 12:19:25,008 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-21 12:19:25,008 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-21 12:19:25,008 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-21 12:19:25,008 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-21 12:19:25,009 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-21 12:19:25,010 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-21 12:19:25,025 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-21 12:19:25,027 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-21 12:19:25,028 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-21 12:19:25,028 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-21 12:19:25,028 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-21 12:19:25,028 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-21 12:19:25,029 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-21 12:19:25,029 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-21 12:19:25,029 INFO L138 SettingsManager]: * Use SBE=true [2021-12-21 12:19:25,029 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-21 12:19:25,030 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-21 12:19:25,030 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-21 12:19:25,030 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-21 12:19:25,030 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-21 12:19:25,031 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-21 12:19:25,031 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-21 12:19:25,031 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-21 12:19:25,031 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-21 12:19:25,031 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-21 12:19:25,031 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-21 12:19:25,031 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-21 12:19:25,032 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-21 12:19:25,032 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-21 12:19:25,032 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-21 12:19:25,032 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 12:19:25,032 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-21 12:19:25,032 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-21 12:19:25,033 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-21 12:19:25,033 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-21 12:19:25,034 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-21 12:19:25,034 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-21 12:19:25,034 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-21 12:19:25,034 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-21 12:19:25,034 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-21 12:19:25,034 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6c770a3141edeab927df0da4e8c2152e1fb2e87b0c43a352500a7e3d3cff4533 [2021-12-21 12:19:25,219 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-21 12:19:25,232 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-21 12:19:25,234 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-21 12:19:25,235 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-21 12:19:25,235 INFO L275 PluginConnector]: CDTParser initialized [2021-12-21 12:19:25,236 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-invgen/seq-3.i [2021-12-21 12:19:25,284 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6900a1126/a6a40c49ce6a40a6adc758749a159db0/FLAGd306cdd52 [2021-12-21 12:19:25,641 INFO L306 CDTParser]: Found 1 translation units. [2021-12-21 12:19:25,642 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-invgen/seq-3.i [2021-12-21 12:19:25,650 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6900a1126/a6a40c49ce6a40a6adc758749a159db0/FLAGd306cdd52 [2021-12-21 12:19:25,662 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6900a1126/a6a40c49ce6a40a6adc758749a159db0 [2021-12-21 12:19:25,664 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-21 12:19:25,666 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-21 12:19:25,668 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-21 12:19:25,669 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-21 12:19:25,671 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-21 12:19:25,672 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 12:19:25" (1/1) ... [2021-12-21 12:19:25,672 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19dca897 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:19:25, skipping insertion in model container [2021-12-21 12:19:25,673 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 12:19:25" (1/1) ... [2021-12-21 12:19:25,677 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-21 12:19:25,688 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-21 12:19:25,834 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/loop-invgen/seq-3.i[893,906] [2021-12-21 12:19:25,848 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 12:19:25,853 INFO L203 MainTranslator]: Completed pre-run [2021-12-21 12:19:25,863 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/loop-invgen/seq-3.i[893,906] [2021-12-21 12:19:25,869 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-21 12:19:25,882 INFO L208 MainTranslator]: Completed translation [2021-12-21 12:19:25,882 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:19:25 WrapperNode [2021-12-21 12:19:25,882 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-21 12:19:25,883 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-21 12:19:25,884 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-21 12:19:25,884 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-21 12:19:25,888 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:19:25" (1/1) ... [2021-12-21 12:19:25,893 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:19:25" (1/1) ... [2021-12-21 12:19:25,908 INFO L137 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 64 [2021-12-21 12:19:25,909 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-21 12:19:25,909 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-21 12:19:25,909 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-21 12:19:25,910 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-21 12:19:25,915 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:19:25" (1/1) ... [2021-12-21 12:19:25,915 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:19:25" (1/1) ... [2021-12-21 12:19:25,923 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:19:25" (1/1) ... [2021-12-21 12:19:25,923 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:19:25" (1/1) ... [2021-12-21 12:19:25,931 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:19:25" (1/1) ... [2021-12-21 12:19:25,935 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:19:25" (1/1) ... [2021-12-21 12:19:25,938 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:19:25" (1/1) ... [2021-12-21 12:19:25,940 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-21 12:19:25,942 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-21 12:19:25,942 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-21 12:19:25,942 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-21 12:19:25,944 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:19:25" (1/1) ... [2021-12-21 12:19:25,949 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-21 12:19:25,958 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:25,970 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-21 12:19:26,019 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-21 12:19:26,037 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-21 12:19:26,037 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-21 12:19:26,038 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-21 12:19:26,038 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-21 12:19:26,083 INFO L234 CfgBuilder]: Building ICFG [2021-12-21 12:19:26,084 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-21 12:19:26,178 INFO L275 CfgBuilder]: Performing block encoding [2021-12-21 12:19:26,182 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-21 12:19:26,182 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-12-21 12:19:26,183 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 12:19:26 BoogieIcfgContainer [2021-12-21 12:19:26,183 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-21 12:19:26,184 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-21 12:19:26,185 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-21 12:19:26,187 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-21 12:19:26,187 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 12:19:25" (1/3) ... [2021-12-21 12:19:26,188 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6135e8ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 12:19:26, skipping insertion in model container [2021-12-21 12:19:26,188 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 12:19:25" (2/3) ... [2021-12-21 12:19:26,188 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6135e8ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 12:19:26, skipping insertion in model container [2021-12-21 12:19:26,188 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 12:19:26" (3/3) ... [2021-12-21 12:19:26,189 INFO L111 eAbstractionObserver]: Analyzing ICFG seq-3.i [2021-12-21 12:19:26,193 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-21 12:19:26,193 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-21 12:19:26,222 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-21 12:19:26,228 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-21 12:19:26,229 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-21 12:19:26,240 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 15 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) [2021-12-21 12:19:26,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-12-21 12:19:26,248 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:26,249 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:26,250 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:26,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:26,257 INFO L85 PathProgramCache]: Analyzing trace with hash -163175075, now seen corresponding path program 1 times [2021-12-21 12:19:26,263 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:26,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396365497] [2021-12-21 12:19:26,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:26,266 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:26,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:26,511 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:26,511 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:26,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396365497] [2021-12-21 12:19:26,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [396365497] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:19:26,512 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-21 12:19:26,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-12-21 12:19:26,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549727597] [2021-12-21 12:19:26,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:19:26,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-21 12:19:26,517 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:26,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-21 12:19:26,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-12-21 12:19:26,550 INFO L87 Difference]: Start difference. First operand has 16 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 15 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) Second operand has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 7 states have internal predecessors, (11), 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) [2021-12-21 12:19:26,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:26,663 INFO L93 Difference]: Finished difference Result 48 states and 68 transitions. [2021-12-21 12:19:26,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-21 12:19:26,665 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 7 states have internal predecessors, (11), 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 11 [2021-12-21 12:19:26,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:26,670 INFO L225 Difference]: With dead ends: 48 [2021-12-21 12:19:26,671 INFO L226 Difference]: Without dead ends: 23 [2021-12-21 12:19:26,673 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-12-21 12:19:26,678 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 47 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:26,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 60 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:19:26,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-12-21 12:19:26,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 16. [2021-12-21 12:19:26,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 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) [2021-12-21 12:19:26,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-12-21 12:19:26,707 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 11 [2021-12-21 12:19:26,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:26,708 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-12-21 12:19:26,708 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 7 states have internal predecessors, (11), 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) [2021-12-21 12:19:26,709 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-12-21 12:19:26,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-12-21 12:19:26,710 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:26,710 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:26,711 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-21 12:19:26,711 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:26,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:26,713 INFO L85 PathProgramCache]: Analyzing trace with hash -712013865, now seen corresponding path program 1 times [2021-12-21 12:19:26,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:26,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [112831559] [2021-12-21 12:19:26,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:26,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:26,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:26,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:26,754 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:26,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [112831559] [2021-12-21 12:19:26,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [112831559] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:26,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1799385830] [2021-12-21 12:19:26,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:26,756 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:26,756 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:26,776 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:26,777 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-21 12:19:26,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:26,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-21 12:19:26,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:26,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:26,885 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-21 12:19:26,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1799385830] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-21 12:19:26,885 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-21 12:19:26,886 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 7 [2021-12-21 12:19:26,886 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972178172] [2021-12-21 12:19:26,886 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-21 12:19:26,887 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-21 12:19:26,887 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:26,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-21 12:19:26,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-12-21 12:19:26,888 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 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) [2021-12-21 12:19:26,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:26,915 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2021-12-21 12:19:26,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-21 12:19:26,916 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 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 [2021-12-21 12:19:26,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:26,917 INFO L225 Difference]: With dead ends: 26 [2021-12-21 12:19:26,917 INFO L226 Difference]: Without dead ends: 24 [2021-12-21 12:19:26,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-12-21 12:19:26,918 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 12 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:26,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 34 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:19:26,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-12-21 12:19:26,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 18. [2021-12-21 12:19:26,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 17 states have internal predecessors, (21), 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) [2021-12-21 12:19:26,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2021-12-21 12:19:26,932 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 12 [2021-12-21 12:19:26,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:26,932 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2021-12-21 12:19:26,932 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 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) [2021-12-21 12:19:26,933 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2021-12-21 12:19:26,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-12-21 12:19:26,933 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:26,933 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:26,957 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:27,150 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:27,150 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:27,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:27,151 INFO L85 PathProgramCache]: Analyzing trace with hash 1243265849, now seen corresponding path program 1 times [2021-12-21 12:19:27,151 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:27,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893581644] [2021-12-21 12:19:27,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:27,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:27,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:27,236 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:27,236 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:27,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893581644] [2021-12-21 12:19:27,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [893581644] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:27,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [963399356] [2021-12-21 12:19:27,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:27,237 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:27,237 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:27,238 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:27,239 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-21 12:19:27,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:27,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 12:19:27,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:27,373 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:27,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:27,424 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:27,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [963399356] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:27,425 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:27,425 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2021-12-21 12:19:27,425 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353009732] [2021-12-21 12:19:27,425 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:27,425 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-21 12:19:27,426 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:27,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-21 12:19:27,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2021-12-21 12:19:27,427 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 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) [2021-12-21 12:19:27,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:27,529 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2021-12-21 12:19:27,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-21 12:19:27,530 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 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 [2021-12-21 12:19:27,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:27,530 INFO L225 Difference]: With dead ends: 38 [2021-12-21 12:19:27,530 INFO L226 Difference]: Without dead ends: 28 [2021-12-21 12:19:27,531 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=126, Invalid=380, Unknown=0, NotChecked=0, Total=506 [2021-12-21 12:19:27,531 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 32 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:27,532 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 100 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:19:27,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-12-21 12:19:27,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 19. [2021-12-21 12:19:27,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 states have internal predecessors, (22), 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) [2021-12-21 12:19:27,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-12-21 12:19:27,535 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2021-12-21 12:19:27,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:27,535 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-12-21 12:19:27,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 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) [2021-12-21 12:19:27,536 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-12-21 12:19:27,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-12-21 12:19:27,536 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:27,536 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:27,553 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:27,753 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,SelfDestructingSolverStorable2 [2021-12-21 12:19:27,753 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:27,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:27,754 INFO L85 PathProgramCache]: Analyzing trace with hash -2084334856, now seen corresponding path program 1 times [2021-12-21 12:19:27,754 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:27,754 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070825803] [2021-12-21 12:19:27,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:27,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:27,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:27,808 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:27,808 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:27,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070825803] [2021-12-21 12:19:27,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1070825803] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:27,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [386056799] [2021-12-21 12:19:27,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:27,809 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:27,809 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:27,813 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:27,815 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-21 12:19:27,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:27,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-21 12:19:27,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:27,928 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:27,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:27,995 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:27,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [386056799] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:27,996 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:27,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2021-12-21 12:19:27,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951882747] [2021-12-21 12:19:27,997 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:27,997 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-21 12:19:27,997 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:27,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-21 12:19:27,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-12-21 12:19:27,998 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 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) [2021-12-21 12:19:28,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:28,119 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2021-12-21 12:19:28,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-21 12:19:28,119 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 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 [2021-12-21 12:19:28,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:28,120 INFO L225 Difference]: With dead ends: 50 [2021-12-21 12:19:28,120 INFO L226 Difference]: Without dead ends: 40 [2021-12-21 12:19:28,120 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=125, Invalid=381, Unknown=0, NotChecked=0, Total=506 [2021-12-21 12:19:28,121 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 69 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:28,121 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 60 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:19:28,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-12-21 12:19:28,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 21. [2021-12-21 12:19:28,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.25) internal successors, (25), 20 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) [2021-12-21 12:19:28,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-12-21 12:19:28,125 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 15 [2021-12-21 12:19:28,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:28,125 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-12-21 12:19:28,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 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) [2021-12-21 12:19:28,125 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-12-21 12:19:28,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-12-21 12:19:28,126 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:28,126 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:28,150 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:28,343 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:28,344 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:28,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:28,344 INFO L85 PathProgramCache]: Analyzing trace with hash -929410893, now seen corresponding path program 2 times [2021-12-21 12:19:28,344 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:28,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [333178592] [2021-12-21 12:19:28,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:28,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:28,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:28,408 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:28,408 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:28,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [333178592] [2021-12-21 12:19:28,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [333178592] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:28,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1311760303] [2021-12-21 12:19:28,409 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:19:28,409 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:28,409 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:28,421 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:28,422 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-21 12:19:28,446 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:19:28,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:28,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-21 12:19:28,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:28,481 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:28,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:28,531 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:28,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1311760303] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:28,531 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:28,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 8 [2021-12-21 12:19:28,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955959246] [2021-12-21 12:19:28,532 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:28,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-21 12:19:28,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:28,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-21 12:19:28,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-12-21 12:19:28,533 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 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) [2021-12-21 12:19:28,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:28,614 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2021-12-21 12:19:28,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-21 12:19:28,615 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 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) Word has length 16 [2021-12-21 12:19:28,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:28,616 INFO L225 Difference]: With dead ends: 32 [2021-12-21 12:19:28,617 INFO L226 Difference]: Without dead ends: 30 [2021-12-21 12:19:28,618 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2021-12-21 12:19:28,618 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 20 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:28,619 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 61 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:19:28,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-12-21 12:19:28,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2021-12-21 12:19:28,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 states have internal predecessors, (28), 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) [2021-12-21 12:19:28,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-12-21 12:19:28,630 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 16 [2021-12-21 12:19:28,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:28,630 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-12-21 12:19:28,630 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 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) [2021-12-21 12:19:28,631 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-12-21 12:19:28,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-12-21 12:19:28,638 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:28,639 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:28,656 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:28,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:28,856 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:28,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:28,856 INFO L85 PathProgramCache]: Analyzing trace with hash 1579087069, now seen corresponding path program 3 times [2021-12-21 12:19:28,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:28,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26771480] [2021-12-21 12:19:28,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:28,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:28,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:28,946 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:28,946 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:28,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26771480] [2021-12-21 12:19:28,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [26771480] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:28,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2120134443] [2021-12-21 12:19:28,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:19:28,947 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:28,947 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:28,950 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:28,951 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-21 12:19:28,989 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-21 12:19:28,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:28,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-21 12:19:28,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:29,178 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:29,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:29,272 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:29,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2120134443] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:29,272 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:29,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2021-12-21 12:19:29,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357014735] [2021-12-21 12:19:29,273 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:29,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-21 12:19:29,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:29,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-21 12:19:29,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2021-12-21 12:19:29,274 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 21 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 21 states have internal predecessors, (41), 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) [2021-12-21 12:19:29,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:29,414 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2021-12-21 12:19:29,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-21 12:19:29,414 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 21 states have internal predecessors, (41), 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 19 [2021-12-21 12:19:29,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:29,415 INFO L225 Difference]: With dead ends: 51 [2021-12-21 12:19:29,415 INFO L226 Difference]: Without dead ends: 38 [2021-12-21 12:19:29,415 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=187, Invalid=625, Unknown=0, NotChecked=0, Total=812 [2021-12-21 12:19:29,416 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 58 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:29,416 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 90 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:29,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-12-21 12:19:29,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 25. [2021-12-21 12:19:29,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 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) [2021-12-21 12:19:29,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2021-12-21 12:19:29,421 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 19 [2021-12-21 12:19:29,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:29,421 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2021-12-21 12:19:29,421 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 21 states have internal predecessors, (41), 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) [2021-12-21 12:19:29,421 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2021-12-21 12:19:29,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-12-21 12:19:29,422 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:29,422 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:29,442 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:29,636 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:29,636 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:29,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:29,637 INFO L85 PathProgramCache]: Analyzing trace with hash 1678234908, now seen corresponding path program 1 times [2021-12-21 12:19:29,637 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:29,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496544589] [2021-12-21 12:19:29,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:29,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:29,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:29,704 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:29,705 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:29,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496544589] [2021-12-21 12:19:29,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1496544589] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:29,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1137090864] [2021-12-21 12:19:29,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:29,705 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:29,706 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:29,707 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:29,715 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-21 12:19:29,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:29,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-21 12:19:29,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:29,881 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:29,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:29,943 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:29,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1137090864] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:29,943 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:29,943 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2021-12-21 12:19:29,943 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160603717] [2021-12-21 12:19:29,943 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:29,944 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-21 12:19:29,944 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:29,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-21 12:19:29,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=303, Unknown=0, NotChecked=0, Total=380 [2021-12-21 12:19:29,944 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 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) [2021-12-21 12:19:30,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:30,070 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2021-12-21 12:19:30,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-21 12:19:30,070 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 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 19 [2021-12-21 12:19:30,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:30,073 INFO L225 Difference]: With dead ends: 64 [2021-12-21 12:19:30,073 INFO L226 Difference]: Without dead ends: 51 [2021-12-21 12:19:30,073 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=190, Invalid=680, Unknown=0, NotChecked=0, Total=870 [2021-12-21 12:19:30,075 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 74 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:30,075 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 102 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:30,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-12-21 12:19:30,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 25. [2021-12-21 12:19:30,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 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) [2021-12-21 12:19:30,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2021-12-21 12:19:30,082 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 19 [2021-12-21 12:19:30,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:30,082 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2021-12-21 12:19:30,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 20 states have internal predecessors, (40), 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) [2021-12-21 12:19:30,082 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2021-12-21 12:19:30,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-12-21 12:19:30,083 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:30,083 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:30,117 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:30,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:30,284 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:30,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:30,284 INFO L85 PathProgramCache]: Analyzing trace with hash 1265791229, now seen corresponding path program 2 times [2021-12-21 12:19:30,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:30,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840627195] [2021-12-21 12:19:30,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:30,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:30,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:30,354 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:30,354 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:30,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840627195] [2021-12-21 12:19:30,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1840627195] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:30,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1989566276] [2021-12-21 12:19:30,355 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:19:30,355 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:30,355 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:30,372 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:30,373 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-21 12:19:30,397 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:19:30,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:30,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-21 12:19:30,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:30,507 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:30,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:30,560 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:30,560 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1989566276] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:30,560 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:30,561 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 19 [2021-12-21 12:19:30,561 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641338626] [2021-12-21 12:19:30,561 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:30,561 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-21 12:19:30,561 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:30,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-21 12:19:30,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2021-12-21 12:19:30,562 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 19 states have internal predecessors, (39), 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) [2021-12-21 12:19:30,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:30,722 INFO L93 Difference]: Finished difference Result 79 states and 88 transitions. [2021-12-21 12:19:30,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-21 12:19:30,722 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 19 states have internal predecessors, (39), 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 19 [2021-12-21 12:19:30,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:30,723 INFO L225 Difference]: With dead ends: 79 [2021-12-21 12:19:30,723 INFO L226 Difference]: Without dead ends: 66 [2021-12-21 12:19:30,723 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=185, Invalid=627, Unknown=0, NotChecked=0, Total=812 [2021-12-21 12:19:30,724 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 88 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:30,724 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 106 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:19:30,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-12-21 12:19:30,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 27. [2021-12-21 12:19:30,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 26 states have internal predecessors, (32), 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) [2021-12-21 12:19:30,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2021-12-21 12:19:30,728 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 19 [2021-12-21 12:19:30,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:30,728 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2021-12-21 12:19:30,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 19 states have internal predecessors, (39), 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) [2021-12-21 12:19:30,728 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2021-12-21 12:19:30,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-21 12:19:30,729 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:30,729 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:30,747 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:30,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:30,945 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:30,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:30,945 INFO L85 PathProgramCache]: Analyzing trace with hash -1081918121, now seen corresponding path program 4 times [2021-12-21 12:19:30,945 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:30,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1776568742] [2021-12-21 12:19:30,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:30,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:30,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:30,982 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:30,982 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:30,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1776568742] [2021-12-21 12:19:30,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1776568742] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:30,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1741483061] [2021-12-21 12:19:30,983 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:19:30,983 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:30,983 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:31,004 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:31,005 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-21 12:19:31,029 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:19:31,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:31,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-21 12:19:31,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:31,068 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:31,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:31,109 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:31,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1741483061] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:31,109 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:31,109 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2021-12-21 12:19:31,110 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593224636] [2021-12-21 12:19:31,110 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:31,110 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-21 12:19:31,110 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:31,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-21 12:19:31,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-12-21 12:19:31,111 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 9 states have internal predecessors, (28), 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) [2021-12-21 12:19:31,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:31,164 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2021-12-21 12:19:31,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-21 12:19:31,164 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 9 states have internal predecessors, (28), 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 20 [2021-12-21 12:19:31,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:31,165 INFO L225 Difference]: With dead ends: 38 [2021-12-21 12:19:31,165 INFO L226 Difference]: Without dead ends: 36 [2021-12-21 12:19:31,165 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2021-12-21 12:19:31,166 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 24 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:31,166 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 58 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:19:31,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-12-21 12:19:31,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2021-12-21 12:19:31,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.206896551724138) internal successors, (35), 29 states have internal predecessors, (35), 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) [2021-12-21 12:19:31,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2021-12-21 12:19:31,170 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 20 [2021-12-21 12:19:31,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:31,170 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2021-12-21 12:19:31,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 9 states have internal predecessors, (28), 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) [2021-12-21 12:19:31,171 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2021-12-21 12:19:31,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-12-21 12:19:31,171 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:31,171 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:31,205 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:31,405 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,SelfDestructingSolverStorable8 [2021-12-21 12:19:31,406 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:31,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:31,406 INFO L85 PathProgramCache]: Analyzing trace with hash -1983310407, now seen corresponding path program 5 times [2021-12-21 12:19:31,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:31,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209176734] [2021-12-21 12:19:31,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:31,407 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:31,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:31,479 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:31,479 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:31,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209176734] [2021-12-21 12:19:31,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1209176734] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:31,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999443968] [2021-12-21 12:19:31,479 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:19:31,480 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:31,480 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:31,481 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:31,493 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-21 12:19:31,519 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-12-21 12:19:31,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:31,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 12:19:31,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:31,708 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:31,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:31,774 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:31,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1999443968] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:31,774 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:31,774 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2021-12-21 12:19:31,774 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371354001] [2021-12-21 12:19:31,775 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:31,775 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-12-21 12:19:31,775 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:31,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-12-21 12:19:31,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2021-12-21 12:19:31,776 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand has 25 states, 25 states have (on average 1.96) internal successors, (49), 25 states have internal predecessors, (49), 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) [2021-12-21 12:19:31,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:31,908 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2021-12-21 12:19:31,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-21 12:19:31,909 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 25 states have internal predecessors, (49), 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 23 [2021-12-21 12:19:31,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:31,909 INFO L225 Difference]: With dead ends: 64 [2021-12-21 12:19:31,909 INFO L226 Difference]: Without dead ends: 48 [2021-12-21 12:19:31,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=260, Invalid=930, Unknown=0, NotChecked=0, Total=1190 [2021-12-21 12:19:31,910 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 43 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:31,911 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 121 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:19:31,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-12-21 12:19:31,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 31. [2021-12-21 12:19:31,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.2) internal successors, (36), 30 states have internal predecessors, (36), 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) [2021-12-21 12:19:31,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2021-12-21 12:19:31,915 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 23 [2021-12-21 12:19:31,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:31,915 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2021-12-21 12:19:31,915 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 25 states have internal predecessors, (49), 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) [2021-12-21 12:19:31,915 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2021-12-21 12:19:31,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-12-21 12:19:31,916 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:31,916 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:31,959 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-12-21 12:19:32,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-21 12:19:32,127 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:32,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:32,128 INFO L85 PathProgramCache]: Analyzing trace with hash -1279672712, now seen corresponding path program 2 times [2021-12-21 12:19:32,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:32,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352699965] [2021-12-21 12:19:32,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:32,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:32,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:32,214 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:32,214 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:32,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352699965] [2021-12-21 12:19:32,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352699965] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:32,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1239102611] [2021-12-21 12:19:32,214 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:19:32,214 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:32,215 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:32,215 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:32,244 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-21 12:19:32,268 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:19:32,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:32,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 12:19:32,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:32,419 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:32,419 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:32,478 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:32,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1239102611] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:32,478 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:32,478 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2021-12-21 12:19:32,478 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795322369] [2021-12-21 12:19:32,478 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:32,479 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-21 12:19:32,479 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:32,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-21 12:19:32,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2021-12-21 12:19:32,479 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 24 states, 24 states have (on average 2.0) internal successors, (48), 24 states have internal predecessors, (48), 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) [2021-12-21 12:19:32,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:32,643 INFO L93 Difference]: Finished difference Result 81 states and 89 transitions. [2021-12-21 12:19:32,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-21 12:19:32,643 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0) internal successors, (48), 24 states have internal predecessors, (48), 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 23 [2021-12-21 12:19:32,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:32,643 INFO L225 Difference]: With dead ends: 81 [2021-12-21 12:19:32,643 INFO L226 Difference]: Without dead ends: 65 [2021-12-21 12:19:32,644 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=274, Invalid=1058, Unknown=0, NotChecked=0, Total=1332 [2021-12-21 12:19:32,644 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 70 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:32,645 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 133 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:32,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-12-21 12:19:32,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 31. [2021-12-21 12:19:32,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.2) internal successors, (36), 30 states have internal predecessors, (36), 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) [2021-12-21 12:19:32,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2021-12-21 12:19:32,649 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 23 [2021-12-21 12:19:32,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:32,649 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2021-12-21 12:19:32,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.0) internal successors, (48), 24 states have internal predecessors, (48), 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) [2021-12-21 12:19:32,650 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2021-12-21 12:19:32,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-12-21 12:19:32,650 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:32,650 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:32,670 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:32,867 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-12-21 12:19:32,867 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:32,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:32,868 INFO L85 PathProgramCache]: Analyzing trace with hash 1791066585, now seen corresponding path program 3 times [2021-12-21 12:19:32,868 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:32,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1229573122] [2021-12-21 12:19:32,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:32,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:32,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:32,944 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:32,944 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:32,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1229573122] [2021-12-21 12:19:32,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1229573122] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:32,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396777280] [2021-12-21 12:19:32,944 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:19:32,945 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:32,945 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:32,946 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:32,947 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-21 12:19:32,973 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-21 12:19:32,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:32,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 12:19:32,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:33,153 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:33,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:33,222 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:33,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396777280] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:33,223 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:33,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 23 [2021-12-21 12:19:33,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034717662] [2021-12-21 12:19:33,223 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:33,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-21 12:19:33,223 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:33,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-21 12:19:33,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=407, Unknown=0, NotChecked=0, Total=506 [2021-12-21 12:19:33,224 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 23 states have internal predecessors, (47), 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) [2021-12-21 12:19:33,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:33,439 INFO L93 Difference]: Finished difference Result 97 states and 106 transitions. [2021-12-21 12:19:33,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-21 12:19:33,440 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 23 states have internal predecessors, (47), 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 23 [2021-12-21 12:19:33,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:33,440 INFO L225 Difference]: With dead ends: 97 [2021-12-21 12:19:33,440 INFO L226 Difference]: Without dead ends: 81 [2021-12-21 12:19:33,441 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=273, Invalid=1059, Unknown=0, NotChecked=0, Total=1332 [2021-12-21 12:19:33,442 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 97 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:33,442 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 152 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:33,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-12-21 12:19:33,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 31. [2021-12-21 12:19:33,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.2) internal successors, (36), 30 states have internal predecessors, (36), 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) [2021-12-21 12:19:33,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2021-12-21 12:19:33,447 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 23 [2021-12-21 12:19:33,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:33,447 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2021-12-21 12:19:33,448 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 23 states have internal predecessors, (47), 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) [2021-12-21 12:19:33,448 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2021-12-21 12:19:33,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-12-21 12:19:33,450 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:33,450 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:33,485 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:33,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-12-21 12:19:33,667 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:33,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:33,668 INFO L85 PathProgramCache]: Analyzing trace with hash -1712107944, now seen corresponding path program 3 times [2021-12-21 12:19:33,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:33,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341815581] [2021-12-21 12:19:33,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:33,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:33,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:33,744 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:33,744 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:33,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341815581] [2021-12-21 12:19:33,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [341815581] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:33,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1532724826] [2021-12-21 12:19:33,745 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:19:33,745 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:33,745 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:33,746 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:33,758 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-21 12:19:33,786 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-21 12:19:33,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:33,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-21 12:19:33,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:33,936 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:33,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:33,998 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:33,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1532724826] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:33,999 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:33,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 22 [2021-12-21 12:19:33,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555269888] [2021-12-21 12:19:33,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:33,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-21 12:19:33,999 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:34,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-21 12:19:34,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2021-12-21 12:19:34,000 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 22 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) [2021-12-21 12:19:34,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:34,173 INFO L93 Difference]: Finished difference Result 115 states and 126 transitions. [2021-12-21 12:19:34,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-21 12:19:34,173 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 22 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 23 [2021-12-21 12:19:34,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:34,174 INFO L225 Difference]: With dead ends: 115 [2021-12-21 12:19:34,174 INFO L226 Difference]: Without dead ends: 99 [2021-12-21 12:19:34,174 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=257, Invalid=933, Unknown=0, NotChecked=0, Total=1190 [2021-12-21 12:19:34,175 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 132 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:34,175 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 119 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:34,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-12-21 12:19:34,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 33. [2021-12-21 12:19:34,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 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) [2021-12-21 12:19:34,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2021-12-21 12:19:34,179 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 23 [2021-12-21 12:19:34,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:34,179 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2021-12-21 12:19:34,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 22 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) [2021-12-21 12:19:34,179 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2021-12-21 12:19:34,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-21 12:19:34,180 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:34,180 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:34,199 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:34,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-12-21 12:19:34,397 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:34,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:34,397 INFO L85 PathProgramCache]: Analyzing trace with hash -1769959117, now seen corresponding path program 6 times [2021-12-21 12:19:34,397 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:34,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1512118389] [2021-12-21 12:19:34,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:34,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:34,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:34,448 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:34,448 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:34,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1512118389] [2021-12-21 12:19:34,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1512118389] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:34,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [148253373] [2021-12-21 12:19:34,449 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:19:34,449 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:34,449 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:34,468 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:34,531 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-21 12:19:34,556 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-12-21 12:19:34,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:34,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-21 12:19:34,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:34,600 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:34,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:34,641 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:34,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [148253373] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:34,641 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:34,642 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 10 [2021-12-21 12:19:34,642 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130103993] [2021-12-21 12:19:34,642 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:34,642 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-12-21 12:19:34,642 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:34,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-12-21 12:19:34,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-12-21 12:19:34,643 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 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) [2021-12-21 12:19:34,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:34,715 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2021-12-21 12:19:34,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-21 12:19:34,715 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 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 [2021-12-21 12:19:34,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:34,716 INFO L225 Difference]: With dead ends: 44 [2021-12-21 12:19:34,716 INFO L226 Difference]: Without dead ends: 42 [2021-12-21 12:19:34,716 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=83, Invalid=157, Unknown=0, NotChecked=0, Total=240 [2021-12-21 12:19:34,717 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 27 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:34,717 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 84 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:19:34,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-12-21 12:19:34,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 36. [2021-12-21 12:19:34,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.2) internal successors, (42), 35 states have internal predecessors, (42), 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) [2021-12-21 12:19:34,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2021-12-21 12:19:34,738 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 24 [2021-12-21 12:19:34,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:34,738 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2021-12-21 12:19:34,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 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) [2021-12-21 12:19:34,739 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2021-12-21 12:19:34,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-21 12:19:34,739 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:34,739 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:34,756 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-12-21 12:19:34,944 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-12-21 12:19:34,944 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:34,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:34,945 INFO L85 PathProgramCache]: Analyzing trace with hash 466281565, now seen corresponding path program 7 times [2021-12-21 12:19:34,945 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:34,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406516325] [2021-12-21 12:19:34,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:34,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:34,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:35,081 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:35,081 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:35,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406516325] [2021-12-21 12:19:35,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [406516325] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:35,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018832020] [2021-12-21 12:19:35,082 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:19:35,082 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:35,082 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:35,083 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:35,083 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-21 12:19:35,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:35,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-21 12:19:35,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:35,344 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:35,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:35,412 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:35,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018832020] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:35,412 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:35,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2021-12-21 12:19:35,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467092850] [2021-12-21 12:19:35,413 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:35,413 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-12-21 12:19:35,413 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:35,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-12-21 12:19:35,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=651, Unknown=0, NotChecked=0, Total=812 [2021-12-21 12:19:35,414 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 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) [2021-12-21 12:19:35,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:35,590 INFO L93 Difference]: Finished difference Result 77 states and 85 transitions. [2021-12-21 12:19:35,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-21 12:19:35,590 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 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 27 [2021-12-21 12:19:35,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:35,591 INFO L225 Difference]: With dead ends: 77 [2021-12-21 12:19:35,591 INFO L226 Difference]: Without dead ends: 58 [2021-12-21 12:19:35,592 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=345, Invalid=1295, Unknown=0, NotChecked=0, Total=1640 [2021-12-21 12:19:35,592 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 47 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:35,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 147 Invalid, 193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:35,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-12-21 12:19:35,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 37. [2021-12-21 12:19:35,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 36 states have internal predecessors, (43), 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) [2021-12-21 12:19:35,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2021-12-21 12:19:35,597 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 27 [2021-12-21 12:19:35,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:35,597 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2021-12-21 12:19:35,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 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) [2021-12-21 12:19:35,597 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2021-12-21 12:19:35,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-21 12:19:35,598 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:35,598 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:35,617 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:35,815 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:35,815 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:35,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:35,816 INFO L85 PathProgramCache]: Analyzing trace with hash 397088156, now seen corresponding path program 4 times [2021-12-21 12:19:35,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:35,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404152766] [2021-12-21 12:19:35,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:35,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:35,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:35,930 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 16 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:35,930 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:35,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404152766] [2021-12-21 12:19:35,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404152766] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:35,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2128151738] [2021-12-21 12:19:35,931 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:19:35,931 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:35,931 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:35,932 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:35,933 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-21 12:19:35,962 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:19:35,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:35,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-21 12:19:35,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:36,214 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:36,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:36,292 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:36,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2128151738] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:36,292 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:36,292 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2021-12-21 12:19:36,293 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142539242] [2021-12-21 12:19:36,293 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:36,293 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-12-21 12:19:36,293 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:36,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-12-21 12:19:36,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=611, Unknown=0, NotChecked=0, Total=756 [2021-12-21 12:19:36,294 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 28 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 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) [2021-12-21 12:19:36,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:36,568 INFO L93 Difference]: Finished difference Result 98 states and 107 transitions. [2021-12-21 12:19:36,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-21 12:19:36,568 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 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 27 [2021-12-21 12:19:36,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:36,569 INFO L225 Difference]: With dead ends: 98 [2021-12-21 12:19:36,569 INFO L226 Difference]: Without dead ends: 79 [2021-12-21 12:19:36,569 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=374, Invalid=1518, Unknown=0, NotChecked=0, Total=1892 [2021-12-21 12:19:36,570 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 85 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:36,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 104 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:36,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-12-21 12:19:36,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 37. [2021-12-21 12:19:36,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 36 states have internal predecessors, (43), 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) [2021-12-21 12:19:36,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2021-12-21 12:19:36,577 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 27 [2021-12-21 12:19:36,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:36,578 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2021-12-21 12:19:36,578 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 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) [2021-12-21 12:19:36,578 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2021-12-21 12:19:36,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-21 12:19:36,579 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:36,579 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:36,620 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:36,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-12-21 12:19:36,803 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:36,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:36,803 INFO L85 PathProgramCache]: Analyzing trace with hash -1267711875, now seen corresponding path program 5 times [2021-12-21 12:19:36,803 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:36,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821749504] [2021-12-21 12:19:36,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:36,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:36,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:36,915 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 16 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:36,915 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:36,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821749504] [2021-12-21 12:19:36,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1821749504] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:36,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106604653] [2021-12-21 12:19:36,916 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:19:36,916 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:36,916 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:36,917 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:36,918 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-21 12:19:36,948 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-12-21 12:19:36,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:36,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-21 12:19:36,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:37,185 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 26 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:37,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:37,275 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 26 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:37,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2106604653] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:37,275 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:37,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 27 [2021-12-21 12:19:37,276 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195598471] [2021-12-21 12:19:37,276 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:37,276 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-21 12:19:37,276 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:37,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-21 12:19:37,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=569, Unknown=0, NotChecked=0, Total=702 [2021-12-21 12:19:37,277 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 27 states have internal predecessors, (55), 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) [2021-12-21 12:19:37,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:37,551 INFO L93 Difference]: Finished difference Result 118 states and 128 transitions. [2021-12-21 12:19:37,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-21 12:19:37,551 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 27 states have internal predecessors, (55), 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 27 [2021-12-21 12:19:37,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:37,552 INFO L225 Difference]: With dead ends: 118 [2021-12-21 12:19:37,552 INFO L226 Difference]: Without dead ends: 99 [2021-12-21 12:19:37,552 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 555 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=386, Invalid=1594, Unknown=0, NotChecked=0, Total=1980 [2021-12-21 12:19:37,553 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 81 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:37,553 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 171 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:37,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-12-21 12:19:37,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 37. [2021-12-21 12:19:37,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 36 states have internal predecessors, (43), 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) [2021-12-21 12:19:37,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2021-12-21 12:19:37,560 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 27 [2021-12-21 12:19:37,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:37,561 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2021-12-21 12:19:37,561 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 27 states have internal predecessors, (55), 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) [2021-12-21 12:19:37,561 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2021-12-21 12:19:37,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-21 12:19:37,561 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:37,561 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:37,591 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:37,778 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-12-21 12:19:37,779 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:37,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:37,779 INFO L85 PathProgramCache]: Analyzing trace with hash 618247548, now seen corresponding path program 6 times [2021-12-21 12:19:37,779 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:37,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48515318] [2021-12-21 12:19:37,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:37,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:37,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:37,868 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 16 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:37,869 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:37,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48515318] [2021-12-21 12:19:37,869 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [48515318] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:37,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593781034] [2021-12-21 12:19:37,869 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:19:37,869 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:37,869 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:37,870 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:37,871 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-21 12:19:37,901 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-12-21 12:19:37,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:37,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-21 12:19:37,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:38,085 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:38,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:38,154 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:38,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1593781034] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:38,154 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:38,154 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 26 [2021-12-21 12:19:38,154 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813120980] [2021-12-21 12:19:38,154 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:38,154 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-12-21 12:19:38,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:38,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-12-21 12:19:38,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2021-12-21 12:19:38,155 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 26 states have internal predecessors, (54), 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) [2021-12-21 12:19:38,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:38,386 INFO L93 Difference]: Finished difference Result 137 states and 148 transitions. [2021-12-21 12:19:38,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-12-21 12:19:38,387 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 26 states have internal predecessors, (54), 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 27 [2021-12-21 12:19:38,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:38,387 INFO L225 Difference]: With dead ends: 137 [2021-12-21 12:19:38,387 INFO L226 Difference]: Without dead ends: 118 [2021-12-21 12:19:38,388 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=372, Invalid=1520, Unknown=0, NotChecked=0, Total=1892 [2021-12-21 12:19:38,388 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 142 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:38,388 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 133 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:38,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-12-21 12:19:38,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 37. [2021-12-21 12:19:38,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 36 states have internal predecessors, (43), 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) [2021-12-21 12:19:38,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2021-12-21 12:19:38,394 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 27 [2021-12-21 12:19:38,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:38,394 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2021-12-21 12:19:38,394 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 26 states have internal predecessors, (54), 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) [2021-12-21 12:19:38,394 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2021-12-21 12:19:38,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-21 12:19:38,394 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:38,394 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:38,413 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:38,608 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-12-21 12:19:38,609 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:38,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:38,609 INFO L85 PathProgramCache]: Analyzing trace with hash 956179613, now seen corresponding path program 4 times [2021-12-21 12:19:38,609 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:38,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2146695931] [2021-12-21 12:19:38,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:38,609 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:38,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:38,707 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:38,707 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:38,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2146695931] [2021-12-21 12:19:38,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2146695931] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:38,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1688982110] [2021-12-21 12:19:38,707 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:19:38,707 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:38,708 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:38,708 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:38,710 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-21 12:19:38,737 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:19:38,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:38,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-21 12:19:38,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:38,934 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:38,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:39,026 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:39,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1688982110] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:39,027 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:39,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 25 [2021-12-21 12:19:39,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413511842] [2021-12-21 12:19:39,027 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:39,028 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-12-21 12:19:39,028 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:39,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-12-21 12:19:39,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2021-12-21 12:19:39,029 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 25 states, 25 states have (on average 2.12) internal successors, (53), 25 states have internal predecessors, (53), 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) [2021-12-21 12:19:39,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:39,229 INFO L93 Difference]: Finished difference Result 158 states and 171 transitions. [2021-12-21 12:19:39,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-21 12:19:39,229 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.12) internal successors, (53), 25 states have internal predecessors, (53), 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 27 [2021-12-21 12:19:39,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:39,230 INFO L225 Difference]: With dead ends: 158 [2021-12-21 12:19:39,230 INFO L226 Difference]: Without dead ends: 139 [2021-12-21 12:19:39,230 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 413 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=341, Invalid=1299, Unknown=0, NotChecked=0, Total=1640 [2021-12-21 12:19:39,231 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 134 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:39,231 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 150 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:39,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-12-21 12:19:39,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 39. [2021-12-21 12:19:39,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.2105263157894737) internal successors, (46), 38 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) [2021-12-21 12:19:39,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 46 transitions. [2021-12-21 12:19:39,238 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 46 transitions. Word has length 27 [2021-12-21 12:19:39,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:39,238 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 46 transitions. [2021-12-21 12:19:39,238 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.12) internal successors, (53), 25 states have internal predecessors, (53), 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) [2021-12-21 12:19:39,238 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 46 transitions. [2021-12-21 12:19:39,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-21 12:19:39,239 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:39,239 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:39,256 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:39,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:39,457 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:39,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:39,457 INFO L85 PathProgramCache]: Analyzing trace with hash -1056697641, now seen corresponding path program 8 times [2021-12-21 12:19:39,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:39,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31386552] [2021-12-21 12:19:39,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:39,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:39,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:39,498 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:39,498 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:39,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31386552] [2021-12-21 12:19:39,498 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31386552] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:39,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1216917922] [2021-12-21 12:19:39,499 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:19:39,499 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:39,499 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:39,500 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:39,503 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-21 12:19:39,530 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:19:39,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:39,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 13 conjunts are in the unsatisfiable core [2021-12-21 12:19:39,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:39,568 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:39,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:39,608 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:39,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1216917922] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:39,608 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:39,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 11 [2021-12-21 12:19:39,608 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366495810] [2021-12-21 12:19:39,609 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:39,609 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-21 12:19:39,609 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:39,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-21 12:19:39,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-12-21 12:19:39,610 INFO L87 Difference]: Start difference. First operand 39 states and 46 transitions. Second operand has 11 states, 11 states have (on average 3.272727272727273) internal successors, (36), 11 states have internal predecessors, (36), 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) [2021-12-21 12:19:39,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:39,690 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2021-12-21 12:19:39,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-21 12:19:39,690 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.272727272727273) internal successors, (36), 11 states have internal predecessors, (36), 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 28 [2021-12-21 12:19:39,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:39,691 INFO L225 Difference]: With dead ends: 50 [2021-12-21 12:19:39,691 INFO L226 Difference]: Without dead ends: 48 [2021-12-21 12:19:39,691 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=106, Invalid=200, Unknown=0, NotChecked=0, Total=306 [2021-12-21 12:19:39,691 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 36 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:39,692 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 80 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:39,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-12-21 12:19:39,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 42. [2021-12-21 12:19:39,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 41 states have internal predecessors, (49), 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) [2021-12-21 12:19:39,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2021-12-21 12:19:39,699 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 28 [2021-12-21 12:19:39,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:39,699 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2021-12-21 12:19:39,699 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.272727272727273) internal successors, (36), 11 states have internal predecessors, (36), 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) [2021-12-21 12:19:39,699 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2021-12-21 12:19:39,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-21 12:19:39,700 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:39,700 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:39,717 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:39,917 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:39,917 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:39,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:39,918 INFO L85 PathProgramCache]: Analyzing trace with hash 2035699769, now seen corresponding path program 9 times [2021-12-21 12:19:39,918 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:39,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800213627] [2021-12-21 12:19:39,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:39,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:39,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:40,058 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:40,058 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:40,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800213627] [2021-12-21 12:19:40,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1800213627] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:40,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529990493] [2021-12-21 12:19:40,058 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:19:40,058 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:40,058 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:40,059 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:40,060 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-21 12:19:40,099 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-12-21 12:19:40,099 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:40,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-21 12:19:40,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:40,313 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:40,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:40,375 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:40,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529990493] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:40,375 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:40,375 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2021-12-21 12:19:40,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867967711] [2021-12-21 12:19:40,375 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:40,376 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-12-21 12:19:40,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:40,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-12-21 12:19:40,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=849, Unknown=0, NotChecked=0, Total=1056 [2021-12-21 12:19:40,377 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 33 states, 33 states have (on average 1.9696969696969697) internal successors, (65), 33 states have internal predecessors, (65), 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) [2021-12-21 12:19:40,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:40,561 INFO L93 Difference]: Finished difference Result 90 states and 99 transitions. [2021-12-21 12:19:40,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-21 12:19:40,561 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.9696969696969697) internal successors, (65), 33 states have internal predecessors, (65), 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 [2021-12-21 12:19:40,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:40,561 INFO L225 Difference]: With dead ends: 90 [2021-12-21 12:19:40,562 INFO L226 Difference]: Without dead ends: 68 [2021-12-21 12:19:40,564 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=442, Invalid=1720, Unknown=0, NotChecked=0, Total=2162 [2021-12-21 12:19:40,565 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 37 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:40,565 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 157 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:40,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-12-21 12:19:40,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 43. [2021-12-21 12:19:40,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 42 states have internal predecessors, (50), 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) [2021-12-21 12:19:40,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 50 transitions. [2021-12-21 12:19:40,575 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 50 transitions. Word has length 31 [2021-12-21 12:19:40,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:40,575 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 50 transitions. [2021-12-21 12:19:40,576 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.9696969696969697) internal successors, (65), 33 states have internal predecessors, (65), 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) [2021-12-21 12:19:40,576 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 50 transitions. [2021-12-21 12:19:40,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-21 12:19:40,576 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:40,576 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:40,594 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:40,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-12-21 12:19:40,794 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:40,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:40,795 INFO L85 PathProgramCache]: Analyzing trace with hash 992856568, now seen corresponding path program 7 times [2021-12-21 12:19:40,795 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:40,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82351587] [2021-12-21 12:19:40,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:40,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:40,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:40,917 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:40,917 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:40,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82351587] [2021-12-21 12:19:40,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [82351587] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:40,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [816162448] [2021-12-21 12:19:40,918 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:19:40,918 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:40,918 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:40,919 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:40,920 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-12-21 12:19:40,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:40,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-21 12:19:40,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:41,216 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 40 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:41,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:41,283 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 40 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:41,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [816162448] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:41,284 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:41,284 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2021-12-21 12:19:41,284 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772693723] [2021-12-21 12:19:41,284 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:41,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-12-21 12:19:41,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:41,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-12-21 12:19:41,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=804, Unknown=0, NotChecked=0, Total=992 [2021-12-21 12:19:41,285 INFO L87 Difference]: Start difference. First operand 43 states and 50 transitions. Second operand has 32 states, 32 states have (on average 2.0) internal successors, (64), 32 states have internal predecessors, (64), 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) [2021-12-21 12:19:41,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:41,557 INFO L93 Difference]: Finished difference Result 115 states and 125 transitions. [2021-12-21 12:19:41,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-21 12:19:41,558 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 32 states have internal predecessors, (64), 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 [2021-12-21 12:19:41,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:41,558 INFO L225 Difference]: With dead ends: 115 [2021-12-21 12:19:41,558 INFO L226 Difference]: Without dead ends: 93 [2021-12-21 12:19:41,559 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 751 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=490, Invalid=2060, Unknown=0, NotChecked=0, Total=2550 [2021-12-21 12:19:41,560 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 63 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 282 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:41,561 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 225 Invalid, 323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 282 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:41,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-12-21 12:19:41,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 43. [2021-12-21 12:19:41,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 42 states have internal predecessors, (50), 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) [2021-12-21 12:19:41,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 50 transitions. [2021-12-21 12:19:41,571 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 50 transitions. Word has length 31 [2021-12-21 12:19:41,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:41,572 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 50 transitions. [2021-12-21 12:19:41,572 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 32 states have internal predecessors, (64), 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) [2021-12-21 12:19:41,572 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 50 transitions. [2021-12-21 12:19:41,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-21 12:19:41,572 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:41,572 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:41,591 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:41,787 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-12-21 12:19:41,787 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:41,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:41,788 INFO L85 PathProgramCache]: Analyzing trace with hash 1236311129, now seen corresponding path program 8 times [2021-12-21 12:19:41,788 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:41,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892293558] [2021-12-21 12:19:41,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:41,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:41,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:41,895 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 27 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:41,896 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:41,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892293558] [2021-12-21 12:19:41,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [892293558] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:41,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [274355332] [2021-12-21 12:19:41,897 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:19:41,897 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:41,897 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:41,898 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:41,899 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-21 12:19:41,929 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:19:41,930 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:41,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-21 12:19:41,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:42,181 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:42,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:42,280 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:42,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [274355332] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:42,280 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:42,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 31 [2021-12-21 12:19:42,281 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847413341] [2021-12-21 12:19:42,281 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:42,281 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-12-21 12:19:42,281 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:42,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-12-21 12:19:42,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=757, Unknown=0, NotChecked=0, Total=930 [2021-12-21 12:19:42,282 INFO L87 Difference]: Start difference. First operand 43 states and 50 transitions. Second operand has 31 states, 31 states have (on average 2.032258064516129) internal successors, (63), 31 states have internal predecessors, (63), 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) [2021-12-21 12:19:42,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:42,569 INFO L93 Difference]: Finished difference Result 139 states and 150 transitions. [2021-12-21 12:19:42,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-21 12:19:42,569 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.032258064516129) internal successors, (63), 31 states have internal predecessors, (63), 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 [2021-12-21 12:19:42,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:42,570 INFO L225 Difference]: With dead ends: 139 [2021-12-21 12:19:42,570 INFO L226 Difference]: Without dead ends: 117 [2021-12-21 12:19:42,570 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 817 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=520, Invalid=2236, Unknown=0, NotChecked=0, Total=2756 [2021-12-21 12:19:42,571 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 109 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:42,571 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 173 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:42,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-12-21 12:19:42,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 43. [2021-12-21 12:19:42,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 42 states have internal predecessors, (50), 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) [2021-12-21 12:19:42,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 50 transitions. [2021-12-21 12:19:42,584 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 50 transitions. Word has length 31 [2021-12-21 12:19:42,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:42,584 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 50 transitions. [2021-12-21 12:19:42,584 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.032258064516129) internal successors, (63), 31 states have internal predecessors, (63), 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) [2021-12-21 12:19:42,585 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 50 transitions. [2021-12-21 12:19:42,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-21 12:19:42,585 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:42,586 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:42,610 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:42,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:42,803 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:42,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:42,804 INFO L85 PathProgramCache]: Analyzing trace with hash -834045480, now seen corresponding path program 9 times [2021-12-21 12:19:42,804 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:42,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164945816] [2021-12-21 12:19:42,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:42,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:42,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:42,913 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 27 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:42,913 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:42,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164945816] [2021-12-21 12:19:42,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1164945816] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:42,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [372129853] [2021-12-21 12:19:42,914 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:19:42,914 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:42,914 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:42,915 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:42,916 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-12-21 12:19:42,946 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-12-21 12:19:42,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:42,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-21 12:19:42,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:43,177 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:43,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:43,263 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:43,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [372129853] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:43,264 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:43,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 30 [2021-12-21 12:19:43,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608016054] [2021-12-21 12:19:43,264 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:43,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-12-21 12:19:43,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:43,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-12-21 12:19:43,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=708, Unknown=0, NotChecked=0, Total=870 [2021-12-21 12:19:43,265 INFO L87 Difference]: Start difference. First operand 43 states and 50 transitions. Second operand has 30 states, 30 states have (on average 2.066666666666667) internal successors, (62), 30 states have internal predecessors, (62), 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) [2021-12-21 12:19:43,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:43,527 INFO L93 Difference]: Finished difference Result 162 states and 174 transitions. [2021-12-21 12:19:43,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-12-21 12:19:43,528 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.066666666666667) internal successors, (62), 30 states have internal predecessors, (62), 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 [2021-12-21 12:19:43,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:43,528 INFO L225 Difference]: With dead ends: 162 [2021-12-21 12:19:43,528 INFO L226 Difference]: Without dead ends: 140 [2021-12-21 12:19:43,529 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 809 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=519, Invalid=2237, Unknown=0, NotChecked=0, Total=2756 [2021-12-21 12:19:43,530 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 132 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:43,530 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 171 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:43,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-12-21 12:19:43,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 43. [2021-12-21 12:19:43,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 42 states have internal predecessors, (50), 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) [2021-12-21 12:19:43,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 50 transitions. [2021-12-21 12:19:43,539 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 50 transitions. Word has length 31 [2021-12-21 12:19:43,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:43,539 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 50 transitions. [2021-12-21 12:19:43,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.066666666666667) internal successors, (62), 30 states have internal predecessors, (62), 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) [2021-12-21 12:19:43,540 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 50 transitions. [2021-12-21 12:19:43,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-21 12:19:43,540 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:43,540 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:43,559 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:43,757 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:43,757 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:43,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:43,758 INFO L85 PathProgramCache]: Analyzing trace with hash 1315926137, now seen corresponding path program 10 times [2021-12-21 12:19:43,758 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:43,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819563223] [2021-12-21 12:19:43,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:43,758 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:43,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:43,856 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:43,857 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:43,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819563223] [2021-12-21 12:19:43,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1819563223] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:43,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [515785682] [2021-12-21 12:19:43,857 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:19:43,857 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:43,857 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:43,858 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:43,859 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-12-21 12:19:43,912 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:19:43,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:43,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-21 12:19:43,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:44,116 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 40 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:44,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:44,192 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 40 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:44,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [515785682] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:44,192 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:44,192 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 29 [2021-12-21 12:19:44,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887972554] [2021-12-21 12:19:44,192 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:44,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-12-21 12:19:44,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:44,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-12-21 12:19:44,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=657, Unknown=0, NotChecked=0, Total=812 [2021-12-21 12:19:44,193 INFO L87 Difference]: Start difference. First operand 43 states and 50 transitions. Second operand has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 29 states have internal predecessors, (61), 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) [2021-12-21 12:19:44,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:44,502 INFO L93 Difference]: Finished difference Result 184 states and 197 transitions. [2021-12-21 12:19:44,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-12-21 12:19:44,507 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 29 states have internal predecessors, (61), 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 [2021-12-21 12:19:44,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:44,508 INFO L225 Difference]: With dead ends: 184 [2021-12-21 12:19:44,508 INFO L226 Difference]: Without dead ends: 162 [2021-12-21 12:19:44,509 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 714 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=487, Invalid=2063, Unknown=0, NotChecked=0, Total=2550 [2021-12-21 12:19:44,510 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 144 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:44,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [144 Valid, 165 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:44,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-12-21 12:19:44,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 43. [2021-12-21 12:19:44,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 42 states have internal predecessors, (50), 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) [2021-12-21 12:19:44,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 50 transitions. [2021-12-21 12:19:44,532 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 50 transitions. Word has length 31 [2021-12-21 12:19:44,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:44,532 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 50 transitions. [2021-12-21 12:19:44,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 29 states have internal predecessors, (61), 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) [2021-12-21 12:19:44,547 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 50 transitions. [2021-12-21 12:19:44,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-21 12:19:44,547 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:44,548 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:44,564 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:44,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-12-21 12:19:44,761 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:44,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:44,761 INFO L85 PathProgramCache]: Analyzing trace with hash 1246732728, now seen corresponding path program 5 times [2021-12-21 12:19:44,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:44,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2001775553] [2021-12-21 12:19:44,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:44,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:44,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:44,858 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:44,858 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:44,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2001775553] [2021-12-21 12:19:44,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2001775553] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:44,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [709906394] [2021-12-21 12:19:44,858 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:19:44,859 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:44,859 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:44,860 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:44,860 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-12-21 12:19:44,890 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-21 12:19:44,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:44,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-21 12:19:44,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:45,082 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:45,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:45,147 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:45,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [709906394] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:45,147 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:45,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 28 [2021-12-21 12:19:45,148 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972527109] [2021-12-21 12:19:45,148 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:45,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-12-21 12:19:45,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:45,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-12-21 12:19:45,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=604, Unknown=0, NotChecked=0, Total=756 [2021-12-21 12:19:45,149 INFO L87 Difference]: Start difference. First operand 43 states and 50 transitions. Second operand has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 28 states have internal predecessors, (60), 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) [2021-12-21 12:19:45,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:45,429 INFO L93 Difference]: Finished difference Result 208 states and 223 transitions. [2021-12-21 12:19:45,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-21 12:19:45,430 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 28 states have internal predecessors, (60), 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 [2021-12-21 12:19:45,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:45,430 INFO L225 Difference]: With dead ends: 208 [2021-12-21 12:19:45,430 INFO L226 Difference]: Without dead ends: 186 [2021-12-21 12:19:45,431 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 568 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=437, Invalid=1725, Unknown=0, NotChecked=0, Total=2162 [2021-12-21 12:19:45,431 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 228 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:45,432 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [228 Valid, 129 Invalid, 178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:45,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2021-12-21 12:19:45,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 45. [2021-12-21 12:19:45,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2045454545454546) internal successors, (53), 44 states have internal predecessors, (53), 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) [2021-12-21 12:19:45,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2021-12-21 12:19:45,445 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 31 [2021-12-21 12:19:45,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:45,445 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2021-12-21 12:19:45,446 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 28 states have internal predecessors, (60), 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) [2021-12-21 12:19:45,446 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2021-12-21 12:19:45,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-21 12:19:45,446 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:45,446 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:45,463 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:45,662 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-12-21 12:19:45,662 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:45,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:45,662 INFO L85 PathProgramCache]: Analyzing trace with hash 1761587635, now seen corresponding path program 10 times [2021-12-21 12:19:45,662 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:45,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210940488] [2021-12-21 12:19:45,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:45,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:45,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:45,721 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 15 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:45,721 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:45,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210940488] [2021-12-21 12:19:45,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [210940488] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:45,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284809383] [2021-12-21 12:19:45,722 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:19:45,722 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:45,722 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:45,723 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:45,764 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-12-21 12:19:45,770 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:19:45,771 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:45,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-21 12:19:45,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:45,832 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:45,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:45,895 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:45,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284809383] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:45,896 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:45,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 12 [2021-12-21 12:19:45,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952990169] [2021-12-21 12:19:45,896 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:45,896 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-21 12:19:45,896 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:45,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-21 12:19:45,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2021-12-21 12:19:45,897 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 12 states have internal predecessors, (40), 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) [2021-12-21 12:19:46,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:46,007 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2021-12-21 12:19:46,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-21 12:19:46,007 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 12 states have internal predecessors, (40), 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 32 [2021-12-21 12:19:46,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:46,008 INFO L225 Difference]: With dead ends: 56 [2021-12-21 12:19:46,008 INFO L226 Difference]: Without dead ends: 54 [2021-12-21 12:19:46,008 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=132, Invalid=248, Unknown=0, NotChecked=0, Total=380 [2021-12-21 12:19:46,008 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 44 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:46,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 100 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:46,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-12-21 12:19:46,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 48. [2021-12-21 12:19:46,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.1914893617021276) internal successors, (56), 47 states have internal predecessors, (56), 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) [2021-12-21 12:19:46,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2021-12-21 12:19:46,019 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 32 [2021-12-21 12:19:46,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:46,020 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2021-12-21 12:19:46,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 12 states have internal predecessors, (40), 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) [2021-12-21 12:19:46,020 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2021-12-21 12:19:46,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-21 12:19:46,020 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:46,020 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:46,037 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:46,236 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-12-21 12:19:46,237 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:46,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:46,237 INFO L85 PathProgramCache]: Analyzing trace with hash -743312419, now seen corresponding path program 11 times [2021-12-21 12:19:46,237 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:46,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1006009332] [2021-12-21 12:19:46,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:46,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:46,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:46,379 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 41 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:46,379 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:46,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1006009332] [2021-12-21 12:19:46,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1006009332] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:46,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678273338] [2021-12-21 12:19:46,379 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:19:46,379 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:46,379 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:46,380 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:46,382 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-12-21 12:19:46,414 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-12-21 12:19:46,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:46,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-21 12:19:46,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:46,748 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:46,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:46,846 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:46,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [678273338] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:46,847 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:46,847 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2021-12-21 12:19:46,847 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260720984] [2021-12-21 12:19:46,847 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:46,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-12-21 12:19:46,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:46,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-12-21 12:19:46,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=1073, Unknown=0, NotChecked=0, Total=1332 [2021-12-21 12:19:46,848 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 37 states have internal predecessors, (73), 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) [2021-12-21 12:19:47,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:47,085 INFO L93 Difference]: Finished difference Result 103 states and 113 transitions. [2021-12-21 12:19:47,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-21 12:19:47,085 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 37 states have internal predecessors, (73), 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 35 [2021-12-21 12:19:47,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:47,086 INFO L225 Difference]: With dead ends: 103 [2021-12-21 12:19:47,086 INFO L226 Difference]: Without dead ends: 78 [2021-12-21 12:19:47,086 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 834 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=551, Invalid=2205, Unknown=0, NotChecked=0, Total=2756 [2021-12-21 12:19:47,087 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 58 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:47,087 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 142 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 182 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:47,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-12-21 12:19:47,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 49. [2021-12-21 12:19:47,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1875) internal successors, (57), 48 states have internal predecessors, (57), 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) [2021-12-21 12:19:47,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2021-12-21 12:19:47,100 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 35 [2021-12-21 12:19:47,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:47,100 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2021-12-21 12:19:47,100 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 37 states have internal predecessors, (73), 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) [2021-12-21 12:19:47,100 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2021-12-21 12:19:47,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-21 12:19:47,100 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:47,100 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:47,119 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:47,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-12-21 12:19:47,309 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:47,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:47,309 INFO L85 PathProgramCache]: Analyzing trace with hash -2052557284, now seen corresponding path program 11 times [2021-12-21 12:19:47,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:47,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81093267] [2021-12-21 12:19:47,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:47,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:47,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:47,465 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 41 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:47,465 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:47,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81093267] [2021-12-21 12:19:47,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [81093267] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:47,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [80417070] [2021-12-21 12:19:47,466 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:19:47,466 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:47,466 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:47,468 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:47,469 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-12-21 12:19:47,499 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-12-21 12:19:47,500 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:47,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-21 12:19:47,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:47,819 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 57 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:47,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:47,911 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 57 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:47,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [80417070] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:47,912 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:47,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2021-12-21 12:19:47,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021494755] [2021-12-21 12:19:47,912 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:47,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-12-21 12:19:47,912 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:47,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-12-21 12:19:47,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=1023, Unknown=0, NotChecked=0, Total=1260 [2021-12-21 12:19:47,913 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand has 36 states, 36 states have (on average 2.0) internal successors, (72), 36 states have internal predecessors, (72), 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) [2021-12-21 12:19:48,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:48,273 INFO L93 Difference]: Finished difference Result 132 states and 143 transitions. [2021-12-21 12:19:48,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-12-21 12:19:48,273 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0) internal successors, (72), 36 states have internal predecessors, (72), 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 35 [2021-12-21 12:19:48,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:48,274 INFO L225 Difference]: With dead ends: 132 [2021-12-21 12:19:48,274 INFO L226 Difference]: Without dead ends: 107 [2021-12-21 12:19:48,275 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1009 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=622, Invalid=2684, Unknown=0, NotChecked=0, Total=3306 [2021-12-21 12:19:48,279 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 80 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:48,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 182 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:48,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-12-21 12:19:48,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 49. [2021-12-21 12:19:48,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1875) internal successors, (57), 48 states have internal predecessors, (57), 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) [2021-12-21 12:19:48,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2021-12-21 12:19:48,293 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 35 [2021-12-21 12:19:48,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:48,293 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2021-12-21 12:19:48,293 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.0) internal successors, (72), 36 states have internal predecessors, (72), 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) [2021-12-21 12:19:48,293 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2021-12-21 12:19:48,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-21 12:19:48,294 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:48,294 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:48,312 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:48,495 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-12-21 12:19:48,495 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:48,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:48,495 INFO L85 PathProgramCache]: Analyzing trace with hash 399060989, now seen corresponding path program 12 times [2021-12-21 12:19:48,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:48,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903841697] [2021-12-21 12:19:48,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:48,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:48,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:48,622 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 41 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:48,622 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:48,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903841697] [2021-12-21 12:19:48,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1903841697] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:48,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [532336706] [2021-12-21 12:19:48,622 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:19:48,622 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:48,623 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:48,626 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:48,626 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-12-21 12:19:48,658 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-12-21 12:19:48,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:48,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-21 12:19:48,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:48,950 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 57 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:48,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:49,031 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 57 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:49,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [532336706] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:49,031 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:49,031 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 35 [2021-12-21 12:19:49,031 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974857645] [2021-12-21 12:19:49,031 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:49,031 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-12-21 12:19:49,031 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:49,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-12-21 12:19:49,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=971, Unknown=0, NotChecked=0, Total=1190 [2021-12-21 12:19:49,032 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand has 35 states, 35 states have (on average 2.0285714285714285) internal successors, (71), 35 states have internal predecessors, (71), 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) [2021-12-21 12:19:49,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:49,389 INFO L93 Difference]: Finished difference Result 160 states and 172 transitions. [2021-12-21 12:19:49,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-12-21 12:19:49,389 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0285714285714285) internal successors, (71), 35 states have internal predecessors, (71), 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 35 [2021-12-21 12:19:49,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:49,390 INFO L225 Difference]: With dead ends: 160 [2021-12-21 12:19:49,390 INFO L226 Difference]: Without dead ends: 135 [2021-12-21 12:19:49,391 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1128 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=675, Invalid=2985, Unknown=0, NotChecked=0, Total=3660 [2021-12-21 12:19:49,392 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 93 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:49,392 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 167 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:49,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-12-21 12:19:49,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 49. [2021-12-21 12:19:49,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1875) internal successors, (57), 48 states have internal predecessors, (57), 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) [2021-12-21 12:19:49,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2021-12-21 12:19:49,418 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 35 [2021-12-21 12:19:49,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:49,418 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2021-12-21 12:19:49,418 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.0285714285714285) internal successors, (71), 35 states have internal predecessors, (71), 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) [2021-12-21 12:19:49,418 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2021-12-21 12:19:49,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-21 12:19:49,418 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:49,419 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:49,435 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:49,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:49,631 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:49,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:49,632 INFO L85 PathProgramCache]: Analyzing trace with hash -1045875204, now seen corresponding path program 13 times [2021-12-21 12:19:49,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:49,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2030799179] [2021-12-21 12:19:49,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:49,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:49,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:49,783 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 41 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:49,784 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:49,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2030799179] [2021-12-21 12:19:49,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2030799179] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:49,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [948188250] [2021-12-21 12:19:49,784 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:19:49,784 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:49,784 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:49,788 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:49,788 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-12-21 12:19:49,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:49,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-21 12:19:49,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:50,107 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 57 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:50,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:50,189 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 57 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:50,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [948188250] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:50,190 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:50,190 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 34 [2021-12-21 12:19:50,190 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274966532] [2021-12-21 12:19:50,190 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:50,190 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-12-21 12:19:50,190 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:50,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-12-21 12:19:50,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=917, Unknown=0, NotChecked=0, Total=1122 [2021-12-21 12:19:50,191 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 34 states have internal predecessors, (70), 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) [2021-12-21 12:19:50,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:50,580 INFO L93 Difference]: Finished difference Result 187 states and 200 transitions. [2021-12-21 12:19:50,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-12-21 12:19:50,580 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 34 states have internal predecessors, (70), 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 35 [2021-12-21 12:19:50,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:50,581 INFO L225 Difference]: With dead ends: 187 [2021-12-21 12:19:50,581 INFO L226 Difference]: Without dead ends: 162 [2021-12-21 12:19:50,582 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1163 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=693, Invalid=3089, Unknown=0, NotChecked=0, Total=3782 [2021-12-21 12:19:50,582 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 125 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:50,582 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 207 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:50,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-12-21 12:19:50,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 49. [2021-12-21 12:19:50,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1875) internal successors, (57), 48 states have internal predecessors, (57), 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) [2021-12-21 12:19:50,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2021-12-21 12:19:50,597 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 35 [2021-12-21 12:19:50,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:50,598 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2021-12-21 12:19:50,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 34 states have internal predecessors, (70), 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) [2021-12-21 12:19:50,598 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2021-12-21 12:19:50,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-21 12:19:50,598 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:50,598 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:50,615 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:50,801 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-12-21 12:19:50,802 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:50,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:50,802 INFO L85 PathProgramCache]: Analyzing trace with hash 985723933, now seen corresponding path program 14 times [2021-12-21 12:19:50,802 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:50,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975840571] [2021-12-21 12:19:50,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:50,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:50,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:50,905 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 41 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:50,905 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:50,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975840571] [2021-12-21 12:19:50,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1975840571] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:50,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1399887350] [2021-12-21 12:19:50,905 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:19:50,905 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:50,905 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:50,906 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:50,936 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-12-21 12:19:50,963 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:19:50,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:50,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-21 12:19:50,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:51,160 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 57 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:51,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:51,239 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 57 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:51,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1399887350] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:51,240 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:51,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 33 [2021-12-21 12:19:51,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134856971] [2021-12-21 12:19:51,240 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:51,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-12-21 12:19:51,240 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:51,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-12-21 12:19:51,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=861, Unknown=0, NotChecked=0, Total=1056 [2021-12-21 12:19:51,241 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand has 33 states, 33 states have (on average 2.090909090909091) internal successors, (69), 33 states have internal predecessors, (69), 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) [2021-12-21 12:19:51,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:51,623 INFO L93 Difference]: Finished difference Result 213 states and 227 transitions. [2021-12-21 12:19:51,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-12-21 12:19:51,623 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.090909090909091) internal successors, (69), 33 states have internal predecessors, (69), 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 35 [2021-12-21 12:19:51,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:51,624 INFO L225 Difference]: With dead ends: 213 [2021-12-21 12:19:51,624 INFO L226 Difference]: Without dead ends: 188 [2021-12-21 12:19:51,626 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1113 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=673, Invalid=2987, Unknown=0, NotChecked=0, Total=3660 [2021-12-21 12:19:51,626 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 161 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:51,626 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 163 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:51,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-12-21 12:19:51,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 49. [2021-12-21 12:19:51,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1875) internal successors, (57), 48 states have internal predecessors, (57), 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) [2021-12-21 12:19:51,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2021-12-21 12:19:51,647 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 35 [2021-12-21 12:19:51,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:51,647 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2021-12-21 12:19:51,647 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.090909090909091) internal successors, (69), 33 states have internal predecessors, (69), 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) [2021-12-21 12:19:51,648 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2021-12-21 12:19:51,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-21 12:19:51,648 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:51,648 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:51,664 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2021-12-21 12:19:51,863 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:51,864 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:51,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:51,864 INFO L85 PathProgramCache]: Analyzing trace with hash -57119268, now seen corresponding path program 15 times [2021-12-21 12:19:51,864 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:51,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649205340] [2021-12-21 12:19:51,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:51,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:51,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:51,987 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 41 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:51,987 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:51,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649205340] [2021-12-21 12:19:51,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649205340] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:51,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668864961] [2021-12-21 12:19:51,988 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:19:51,989 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:51,989 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:51,990 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:51,991 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-12-21 12:19:52,026 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-12-21 12:19:52,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:52,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-21 12:19:52,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:52,287 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 57 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:52,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:52,381 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 57 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:52,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [668864961] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:52,382 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:52,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 32 [2021-12-21 12:19:52,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351712450] [2021-12-21 12:19:52,382 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:52,382 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-12-21 12:19:52,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:52,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-12-21 12:19:52,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=803, Unknown=0, NotChecked=0, Total=992 [2021-12-21 12:19:52,383 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand has 32 states, 32 states have (on average 2.125) internal successors, (68), 32 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) [2021-12-21 12:19:52,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:52,735 INFO L93 Difference]: Finished difference Result 238 states and 253 transitions. [2021-12-21 12:19:52,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-12-21 12:19:52,735 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.125) internal successors, (68), 32 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) Word has length 35 [2021-12-21 12:19:52,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:52,736 INFO L225 Difference]: With dead ends: 238 [2021-12-21 12:19:52,736 INFO L226 Difference]: Without dead ends: 213 [2021-12-21 12:19:52,737 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 959 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=618, Invalid=2688, Unknown=0, NotChecked=0, Total=3306 [2021-12-21 12:19:52,737 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 170 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:52,737 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 184 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:52,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-12-21 12:19:52,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 49. [2021-12-21 12:19:52,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.1875) internal successors, (57), 48 states have internal predecessors, (57), 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) [2021-12-21 12:19:52,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2021-12-21 12:19:52,753 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 35 [2021-12-21 12:19:52,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:52,753 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2021-12-21 12:19:52,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.125) internal successors, (68), 32 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) [2021-12-21 12:19:52,754 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2021-12-21 12:19:52,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-21 12:19:52,754 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:52,754 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:52,772 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:52,965 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:52,966 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:52,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:52,966 INFO L85 PathProgramCache]: Analyzing trace with hash 186335293, now seen corresponding path program 6 times [2021-12-21 12:19:52,966 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:52,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518556894] [2021-12-21 12:19:52,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:52,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:52,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:53,096 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 41 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:53,096 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:53,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518556894] [2021-12-21 12:19:53,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1518556894] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:53,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [210459516] [2021-12-21 12:19:53,097 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:19:53,097 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:53,097 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:53,098 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:53,099 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-12-21 12:19:53,130 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-12-21 12:19:53,130 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:53,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-21 12:19:53,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:53,393 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:53,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:53,472 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:53,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [210459516] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:53,472 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:53,472 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 31 [2021-12-21 12:19:53,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698217591] [2021-12-21 12:19:53,473 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:53,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-12-21 12:19:53,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:53,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-12-21 12:19:53,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=743, Unknown=0, NotChecked=0, Total=930 [2021-12-21 12:19:53,473 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand has 31 states, 31 states have (on average 2.161290322580645) internal successors, (67), 31 states have internal predecessors, (67), 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) [2021-12-21 12:19:53,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:53,757 INFO L93 Difference]: Finished difference Result 265 states and 282 transitions. [2021-12-21 12:19:53,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-12-21 12:19:53,757 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.161290322580645) internal successors, (67), 31 states have internal predecessors, (67), 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 35 [2021-12-21 12:19:53,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:53,758 INFO L225 Difference]: With dead ends: 265 [2021-12-21 12:19:53,758 INFO L226 Difference]: Without dead ends: 240 [2021-12-21 12:19:53,758 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 747 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=545, Invalid=2211, Unknown=0, NotChecked=0, Total=2756 [2021-12-21 12:19:53,759 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 206 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:53,759 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [206 Valid, 184 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:53,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2021-12-21 12:19:53,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 51. [2021-12-21 12:19:53,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.2) internal successors, (60), 50 states have internal predecessors, (60), 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) [2021-12-21 12:19:53,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 60 transitions. [2021-12-21 12:19:53,777 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 60 transitions. Word has length 35 [2021-12-21 12:19:53,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:53,777 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 60 transitions. [2021-12-21 12:19:53,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.161290322580645) internal successors, (67), 31 states have internal predecessors, (67), 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) [2021-12-21 12:19:53,778 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 60 transitions. [2021-12-21 12:19:53,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-12-21 12:19:53,778 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:53,778 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:53,795 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:53,979 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-12-21 12:19:53,980 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:53,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:53,980 INFO L85 PathProgramCache]: Analyzing trace with hash 611977303, now seen corresponding path program 12 times [2021-12-21 12:19:53,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:53,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981972930] [2021-12-21 12:19:53,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:53,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:54,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:54,085 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 21 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:54,085 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:54,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981972930] [2021-12-21 12:19:54,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [981972930] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:54,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1739080999] [2021-12-21 12:19:54,085 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:19:54,085 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:54,085 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:54,100 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:54,101 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-12-21 12:19:54,133 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-12-21 12:19:54,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:54,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-21 12:19:54,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:54,174 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:54,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:54,212 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:54,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1739080999] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:54,212 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:54,212 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 13 [2021-12-21 12:19:54,213 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596771280] [2021-12-21 12:19:54,213 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:54,213 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-21 12:19:54,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:54,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-21 12:19:54,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2021-12-21 12:19:54,213 INFO L87 Difference]: Start difference. First operand 51 states and 60 transitions. Second operand has 13 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 13 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) [2021-12-21 12:19:54,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:54,301 INFO L93 Difference]: Finished difference Result 62 states and 71 transitions. [2021-12-21 12:19:54,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-21 12:19:54,302 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 13 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) Word has length 36 [2021-12-21 12:19:54,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:54,302 INFO L225 Difference]: With dead ends: 62 [2021-12-21 12:19:54,302 INFO L226 Difference]: Without dead ends: 60 [2021-12-21 12:19:54,302 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2021-12-21 12:19:54,303 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 47 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:54,303 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 123 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-21 12:19:54,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-12-21 12:19:54,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2021-12-21 12:19:54,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.1886792452830188) internal successors, (63), 53 states have internal predecessors, (63), 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) [2021-12-21 12:19:54,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2021-12-21 12:19:54,322 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 36 [2021-12-21 12:19:54,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:54,322 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2021-12-21 12:19:54,322 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 13 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) [2021-12-21 12:19:54,322 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2021-12-21 12:19:54,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-21 12:19:54,323 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:54,323 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:54,367 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-12-21 12:19:54,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-12-21 12:19:54,540 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:54,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:54,540 INFO L85 PathProgramCache]: Analyzing trace with hash -715494727, now seen corresponding path program 13 times [2021-12-21 12:19:54,540 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:54,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294985075] [2021-12-21 12:19:54,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:54,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:54,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:54,646 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:54,646 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:54,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294985075] [2021-12-21 12:19:54,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1294985075] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:54,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2060082045] [2021-12-21 12:19:54,647 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:19:54,647 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:54,647 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:54,648 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:54,649 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-12-21 12:19:54,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:54,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 12:19:54,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:55,018 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:55,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:55,087 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:55,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2060082045] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:55,088 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:55,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2021-12-21 12:19:55,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644222066] [2021-12-21 12:19:55,088 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:55,089 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-12-21 12:19:55,089 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:55,089 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-12-21 12:19:55,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=1323, Unknown=0, NotChecked=0, Total=1640 [2021-12-21 12:19:55,089 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 41 states, 41 states have (on average 1.975609756097561) internal successors, (81), 41 states have internal predecessors, (81), 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) [2021-12-21 12:19:55,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:55,298 INFO L93 Difference]: Finished difference Result 116 states and 127 transitions. [2021-12-21 12:19:55,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-21 12:19:55,298 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.975609756097561) internal successors, (81), 41 states have internal predecessors, (81), 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 39 [2021-12-21 12:19:55,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:55,300 INFO L225 Difference]: With dead ends: 116 [2021-12-21 12:19:55,300 INFO L226 Difference]: Without dead ends: 88 [2021-12-21 12:19:55,301 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1063 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=672, Invalid=2750, Unknown=0, NotChecked=0, Total=3422 [2021-12-21 12:19:55,302 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 33 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:55,302 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 177 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:55,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-12-21 12:19:55,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 55. [2021-12-21 12:19:55,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.1851851851851851) internal successors, (64), 54 states have internal predecessors, (64), 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) [2021-12-21 12:19:55,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2021-12-21 12:19:55,323 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 39 [2021-12-21 12:19:55,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:55,323 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2021-12-21 12:19:55,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.975609756097561) internal successors, (81), 41 states have internal predecessors, (81), 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) [2021-12-21 12:19:55,324 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2021-12-21 12:19:55,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-21 12:19:55,324 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:55,324 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:55,341 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:55,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-12-21 12:19:55,541 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:55,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:55,541 INFO L85 PathProgramCache]: Analyzing trace with hash -944261768, now seen corresponding path program 16 times [2021-12-21 12:19:55,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:55,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432294456] [2021-12-21 12:19:55,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:55,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:55,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:55,678 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 58 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:55,678 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:55,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432294456] [2021-12-21 12:19:55,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [432294456] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:55,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [194059449] [2021-12-21 12:19:55,679 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:19:55,679 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:55,679 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:55,680 INFO L229 MonitoredProcess]: Starting monitored process 37 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:55,681 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-12-21 12:19:55,729 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:19:55,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:55,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 12:19:55,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:55,998 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:55,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:56,087 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:56,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [194059449] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:56,087 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:56,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2021-12-21 12:19:56,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731255229] [2021-12-21 12:19:56,088 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:56,089 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-12-21 12:19:56,089 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:56,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-12-21 12:19:56,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=1268, Unknown=0, NotChecked=0, Total=1560 [2021-12-21 12:19:56,090 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 40 states, 40 states have (on average 2.0) internal successors, (80), 40 states have internal predecessors, (80), 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) [2021-12-21 12:19:56,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:56,462 INFO L93 Difference]: Finished difference Result 149 states and 161 transitions. [2021-12-21 12:19:56,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-12-21 12:19:56,462 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.0) internal successors, (80), 40 states have internal predecessors, (80), 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 39 [2021-12-21 12:19:56,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:56,463 INFO L225 Difference]: With dead ends: 149 [2021-12-21 12:19:56,463 INFO L226 Difference]: Without dead ends: 121 [2021-12-21 12:19:56,463 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1304 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=770, Invalid=3390, Unknown=0, NotChecked=0, Total=4160 [2021-12-21 12:19:56,464 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 67 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:56,464 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 179 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 232 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:56,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-12-21 12:19:56,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 55. [2021-12-21 12:19:56,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.1851851851851851) internal successors, (64), 54 states have internal predecessors, (64), 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) [2021-12-21 12:19:56,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2021-12-21 12:19:56,493 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 39 [2021-12-21 12:19:56,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:56,493 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2021-12-21 12:19:56,493 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.0) internal successors, (80), 40 states have internal predecessors, (80), 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) [2021-12-21 12:19:56,493 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2021-12-21 12:19:56,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-21 12:19:56,494 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:56,494 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:56,510 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:56,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:56,696 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:56,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:56,696 INFO L85 PathProgramCache]: Analyzing trace with hash -2060020007, now seen corresponding path program 17 times [2021-12-21 12:19:56,696 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:56,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596302077] [2021-12-21 12:19:56,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:56,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:56,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:56,842 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 58 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:56,843 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:56,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596302077] [2021-12-21 12:19:56,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [596302077] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:56,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1117616349] [2021-12-21 12:19:56,843 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:19:56,843 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:56,843 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:56,857 INFO L229 MonitoredProcess]: Starting monitored process 38 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:56,858 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-12-21 12:19:56,892 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-12-21 12:19:56,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:56,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 12:19:56,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:57,262 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:57,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:57,359 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:57,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1117616349] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:57,359 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:57,359 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 39 [2021-12-21 12:19:57,359 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185504554] [2021-12-21 12:19:57,359 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:57,360 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-12-21 12:19:57,360 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:57,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-12-21 12:19:57,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=1211, Unknown=0, NotChecked=0, Total=1482 [2021-12-21 12:19:57,361 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 39 states have internal predecessors, (79), 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) [2021-12-21 12:19:57,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:57,858 INFO L93 Difference]: Finished difference Result 181 states and 194 transitions. [2021-12-21 12:19:57,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-12-21 12:19:57,859 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 39 states have internal predecessors, (79), 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 39 [2021-12-21 12:19:57,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:57,859 INFO L225 Difference]: With dead ends: 181 [2021-12-21 12:19:57,859 INFO L226 Difference]: Without dead ends: 153 [2021-12-21 12:19:57,860 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1488 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=851, Invalid=3841, Unknown=0, NotChecked=0, Total=4692 [2021-12-21 12:19:57,860 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 77 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 353 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 275 SdHoareTripleChecker+Invalid, 406 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:57,861 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 275 Invalid, 406 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 353 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:57,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-12-21 12:19:57,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 55. [2021-12-21 12:19:57,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.1851851851851851) internal successors, (64), 54 states have internal predecessors, (64), 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) [2021-12-21 12:19:57,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2021-12-21 12:19:57,884 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 39 [2021-12-21 12:19:57,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:57,884 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2021-12-21 12:19:57,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 39 states have internal predecessors, (79), 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) [2021-12-21 12:19:57,885 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2021-12-21 12:19:57,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-21 12:19:57,885 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:57,885 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:57,902 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:58,101 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-12-21 12:19:58,102 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:58,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:58,102 INFO L85 PathProgramCache]: Analyzing trace with hash -1818917544, now seen corresponding path program 18 times [2021-12-21 12:19:58,102 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:58,102 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781023517] [2021-12-21 12:19:58,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:58,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:58,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:58,246 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 58 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:58,247 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:58,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [781023517] [2021-12-21 12:19:58,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [781023517] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:58,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1418016812] [2021-12-21 12:19:58,247 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:19:58,247 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:58,247 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:58,248 INFO L229 MonitoredProcess]: Starting monitored process 39 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:58,249 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-12-21 12:19:58,282 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-12-21 12:19:58,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:19:58,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 12:19:58,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:58,628 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 77 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:58,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:58,720 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 77 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:58,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1418016812] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:58,720 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:58,720 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 38 [2021-12-21 12:19:58,720 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473835086] [2021-12-21 12:19:58,720 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:58,721 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-12-21 12:19:58,721 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:58,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-12-21 12:19:58,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=1152, Unknown=0, NotChecked=0, Total=1406 [2021-12-21 12:19:58,721 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 38 states, 38 states have (on average 2.0526315789473686) internal successors, (78), 38 states have internal predecessors, (78), 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) [2021-12-21 12:19:59,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:19:59,247 INFO L93 Difference]: Finished difference Result 212 states and 226 transitions. [2021-12-21 12:19:59,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-12-21 12:19:59,248 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.0526315789473686) internal successors, (78), 38 states have internal predecessors, (78), 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 39 [2021-12-21 12:19:59,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:19:59,249 INFO L225 Difference]: With dead ends: 212 [2021-12-21 12:19:59,249 INFO L226 Difference]: Without dead ends: 184 [2021-12-21 12:19:59,249 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1580 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=894, Invalid=4076, Unknown=0, NotChecked=0, Total=4970 [2021-12-21 12:19:59,250 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 122 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:19:59,250 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 195 Invalid, 320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:19:59,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-12-21 12:19:59,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 55. [2021-12-21 12:19:59,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.1851851851851851) internal successors, (64), 54 states have internal predecessors, (64), 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) [2021-12-21 12:19:59,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2021-12-21 12:19:59,283 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 39 [2021-12-21 12:19:59,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:19:59,283 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2021-12-21 12:19:59,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.0526315789473686) internal successors, (78), 38 states have internal predecessors, (78), 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) [2021-12-21 12:19:59,283 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2021-12-21 12:19:59,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-21 12:19:59,284 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:19:59,284 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:19:59,300 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-12-21 12:19:59,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-12-21 12:19:59,500 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:19:59,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:19:59,500 INFO L85 PathProgramCache]: Analyzing trace with hash 544164601, now seen corresponding path program 19 times [2021-12-21 12:19:59,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:19:59,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566234507] [2021-12-21 12:19:59,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:19:59,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:19:59,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:59,649 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 58 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:59,649 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:19:59,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566234507] [2021-12-21 12:19:59,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566234507] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:19:59,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [424094469] [2021-12-21 12:19:59,649 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:19:59,649 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:19:59,650 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:19:59,650 INFO L229 MonitoredProcess]: Starting monitored process 40 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:19:59,651 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-12-21 12:19:59,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:19:59,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 12:19:59,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:19:59,894 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 77 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:59,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:19:59,952 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 77 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:19:59,953 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [424094469] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:19:59,953 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:19:59,953 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 37 [2021-12-21 12:19:59,953 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427895509] [2021-12-21 12:19:59,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:19:59,954 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-12-21 12:19:59,954 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:19:59,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-12-21 12:19:59,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=1091, Unknown=0, NotChecked=0, Total=1332 [2021-12-21 12:19:59,954 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 37 states, 37 states have (on average 2.081081081081081) internal successors, (77), 37 states have internal predecessors, (77), 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) [2021-12-21 12:20:00,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:00,346 INFO L93 Difference]: Finished difference Result 242 states and 257 transitions. [2021-12-21 12:20:00,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-12-21 12:20:00,346 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.081081081081081) internal successors, (77), 37 states have internal predecessors, (77), 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 39 [2021-12-21 12:20:00,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:00,347 INFO L225 Difference]: With dead ends: 242 [2021-12-21 12:20:00,347 INFO L226 Difference]: Without dead ends: 214 [2021-12-21 12:20:00,347 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1575 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=893, Invalid=4077, Unknown=0, NotChecked=0, Total=4970 [2021-12-21 12:20:00,348 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 160 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:00,348 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 184 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:00,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-12-21 12:20:00,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 55. [2021-12-21 12:20:00,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.1851851851851851) internal successors, (64), 54 states have internal predecessors, (64), 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) [2021-12-21 12:20:00,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2021-12-21 12:20:00,373 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 39 [2021-12-21 12:20:00,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:00,373 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2021-12-21 12:20:00,373 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.081081081081081) internal successors, (77), 37 states have internal predecessors, (77), 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) [2021-12-21 12:20:00,374 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2021-12-21 12:20:00,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-21 12:20:00,374 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:00,374 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:00,393 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:00,590 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-12-21 12:20:00,591 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:00,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:00,591 INFO L85 PathProgramCache]: Analyzing trace with hash -765080264, now seen corresponding path program 20 times [2021-12-21 12:20:00,591 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:00,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1767657787] [2021-12-21 12:20:00,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:00,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:00,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:00,733 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 58 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:00,734 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:00,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1767657787] [2021-12-21 12:20:00,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1767657787] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:00,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [770255205] [2021-12-21 12:20:00,734 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:20:00,734 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:00,735 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:00,735 INFO L229 MonitoredProcess]: Starting monitored process 41 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:00,736 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-12-21 12:20:00,769 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:20:00,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:00,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 12:20:00,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:01,086 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:01,086 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:01,180 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:01,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [770255205] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:01,181 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:01,181 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 36 [2021-12-21 12:20:01,181 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531946304] [2021-12-21 12:20:01,181 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:01,181 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-12-21 12:20:01,182 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:01,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-12-21 12:20:01,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=1028, Unknown=0, NotChecked=0, Total=1260 [2021-12-21 12:20:01,182 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 36 states have internal predecessors, (76), 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) [2021-12-21 12:20:01,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:01,756 INFO L93 Difference]: Finished difference Result 271 states and 287 transitions. [2021-12-21 12:20:01,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-12-21 12:20:01,757 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 36 states have internal predecessors, (76), 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 39 [2021-12-21 12:20:01,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:01,758 INFO L225 Difference]: With dead ends: 271 [2021-12-21 12:20:01,758 INFO L226 Difference]: Without dead ends: 243 [2021-12-21 12:20:01,758 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1467 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=848, Invalid=3844, Unknown=0, NotChecked=0, Total=4692 [2021-12-21 12:20:01,758 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 162 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 359 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:01,759 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [162 Valid, 237 Invalid, 359 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 287 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:01,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-12-21 12:20:01,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 55. [2021-12-21 12:20:01,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.1851851851851851) internal successors, (64), 54 states have internal predecessors, (64), 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) [2021-12-21 12:20:01,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2021-12-21 12:20:01,787 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 39 [2021-12-21 12:20:01,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:01,788 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2021-12-21 12:20:01,788 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 36 states have internal predecessors, (76), 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) [2021-12-21 12:20:01,788 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2021-12-21 12:20:01,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-21 12:20:01,788 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:01,788 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:01,822 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:02,007 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-12-21 12:20:02,008 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:02,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:02,008 INFO L85 PathProgramCache]: Analyzing trace with hash 1686538009, now seen corresponding path program 21 times [2021-12-21 12:20:02,008 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:02,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559192434] [2021-12-21 12:20:02,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:02,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:02,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:02,156 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 58 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:02,156 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:02,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559192434] [2021-12-21 12:20:02,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1559192434] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:02,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [722371053] [2021-12-21 12:20:02,156 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:20:02,157 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:02,157 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:02,164 INFO L229 MonitoredProcess]: Starting monitored process 42 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:02,165 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-12-21 12:20:02,200 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-12-21 12:20:02,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:02,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 12:20:02,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:02,505 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:02,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:02,600 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:02,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [722371053] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:02,601 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:02,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 35 [2021-12-21 12:20:02,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259970913] [2021-12-21 12:20:02,601 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:02,601 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-12-21 12:20:02,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:02,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-12-21 12:20:02,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=963, Unknown=0, NotChecked=0, Total=1190 [2021-12-21 12:20:02,602 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 35 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) [2021-12-21 12:20:03,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:03,161 INFO L93 Difference]: Finished difference Result 299 states and 316 transitions. [2021-12-21 12:20:03,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-12-21 12:20:03,161 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 35 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 39 [2021-12-21 12:20:03,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:03,162 INFO L225 Difference]: With dead ends: 299 [2021-12-21 12:20:03,162 INFO L226 Difference]: Without dead ends: 271 [2021-12-21 12:20:03,163 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1240 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=765, Invalid=3395, Unknown=0, NotChecked=0, Total=4160 [2021-12-21 12:20:03,163 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 214 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:03,164 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [214 Valid, 219 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:03,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-12-21 12:20:03,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 55. [2021-12-21 12:20:03,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.1851851851851851) internal successors, (64), 54 states have internal predecessors, (64), 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) [2021-12-21 12:20:03,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2021-12-21 12:20:03,192 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 39 [2021-12-21 12:20:03,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:03,193 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2021-12-21 12:20:03,193 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 35 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) [2021-12-21 12:20:03,193 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2021-12-21 12:20:03,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-21 12:20:03,193 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:03,193 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:03,210 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:03,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,42 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:03,410 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:03,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:03,411 INFO L85 PathProgramCache]: Analyzing trace with hash 241601816, now seen corresponding path program 7 times [2021-12-21 12:20:03,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:03,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192661737] [2021-12-21 12:20:03,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:03,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:03,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:03,556 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:03,556 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:03,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192661737] [2021-12-21 12:20:03,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [192661737] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:03,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1771788450] [2021-12-21 12:20:03,556 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:20:03,556 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:03,556 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:03,557 INFO L229 MonitoredProcess]: Starting monitored process 43 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:03,558 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-12-21 12:20:03,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:03,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-21 12:20:03,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:03,896 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:03,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:03,993 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:03,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1771788450] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:03,994 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:03,994 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 34 [2021-12-21 12:20:03,994 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011450712] [2021-12-21 12:20:03,994 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:03,994 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-12-21 12:20:03,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:03,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-12-21 12:20:03,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=896, Unknown=0, NotChecked=0, Total=1122 [2021-12-21 12:20:03,995 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 34 states, 34 states have (on average 2.176470588235294) internal successors, (74), 34 states have internal predecessors, (74), 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) [2021-12-21 12:20:04,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:04,512 INFO L93 Difference]: Finished difference Result 329 states and 348 transitions. [2021-12-21 12:20:04,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-12-21 12:20:04,512 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.176470588235294) internal successors, (74), 34 states have internal predecessors, (74), 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 39 [2021-12-21 12:20:04,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:04,515 INFO L225 Difference]: With dead ends: 329 [2021-12-21 12:20:04,515 INFO L226 Difference]: Without dead ends: 301 [2021-12-21 12:20:04,515 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=665, Invalid=2757, Unknown=0, NotChecked=0, Total=3422 [2021-12-21 12:20:04,520 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 296 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:04,520 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [296 Valid, 148 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:04,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2021-12-21 12:20:04,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 57. [2021-12-21 12:20:04,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.1964285714285714) internal successors, (67), 56 states have internal predecessors, (67), 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) [2021-12-21 12:20:04,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-12-21 12:20:04,593 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 39 [2021-12-21 12:20:04,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:04,594 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-12-21 12:20:04,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.176470588235294) internal successors, (74), 34 states have internal predecessors, (74), 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) [2021-12-21 12:20:04,595 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-12-21 12:20:04,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-21 12:20:04,610 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:04,610 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:04,632 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2021-12-21 12:20:04,810 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,43 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:04,810 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:04,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:04,811 INFO L85 PathProgramCache]: Analyzing trace with hash -1565543885, now seen corresponding path program 14 times [2021-12-21 12:20:04,811 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:04,811 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [331937618] [2021-12-21 12:20:04,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:04,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:04,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:04,883 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 28 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:04,883 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:04,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [331937618] [2021-12-21 12:20:04,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [331937618] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:04,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [889232659] [2021-12-21 12:20:04,884 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:20:04,884 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:04,884 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:04,885 INFO L229 MonitoredProcess]: Starting monitored process 44 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:04,897 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-12-21 12:20:04,940 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:20:04,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:04,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-21 12:20:04,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:05,032 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:05,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:05,114 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:05,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [889232659] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:05,115 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:05,115 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 14 [2021-12-21 12:20:05,115 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896332281] [2021-12-21 12:20:05,115 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:05,115 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-12-21 12:20:05,115 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:05,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-12-21 12:20:05,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2021-12-21 12:20:05,116 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 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) [2021-12-21 12:20:05,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:05,280 INFO L93 Difference]: Finished difference Result 68 states and 78 transitions. [2021-12-21 12:20:05,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-21 12:20:05,280 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 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 40 [2021-12-21 12:20:05,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:05,281 INFO L225 Difference]: With dead ends: 68 [2021-12-21 12:20:05,281 INFO L226 Difference]: Without dead ends: 66 [2021-12-21 12:20:05,281 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=193, Invalid=359, Unknown=0, NotChecked=0, Total=552 [2021-12-21 12:20:05,282 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 54 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:05,282 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 149 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:05,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-12-21 12:20:05,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 60. [2021-12-21 12:20:05,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.1864406779661016) internal successors, (70), 59 states have internal predecessors, (70), 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) [2021-12-21 12:20:05,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2021-12-21 12:20:05,314 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 40 [2021-12-21 12:20:05,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:05,315 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2021-12-21 12:20:05,315 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 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) [2021-12-21 12:20:05,315 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2021-12-21 12:20:05,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-21 12:20:05,315 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:05,315 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:05,332 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:05,532 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-12-21 12:20:05,532 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:05,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:05,532 INFO L85 PathProgramCache]: Analyzing trace with hash -63167651, now seen corresponding path program 15 times [2021-12-21 12:20:05,532 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:05,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672674657] [2021-12-21 12:20:05,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:05,533 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:05,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:05,700 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 78 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:05,700 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:05,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672674657] [2021-12-21 12:20:05,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [672674657] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:05,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146370440] [2021-12-21 12:20:05,701 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:20:05,701 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:05,701 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:05,716 INFO L229 MonitoredProcess]: Starting monitored process 45 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:05,717 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-12-21 12:20:05,753 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-12-21 12:20:05,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:05,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-21 12:20:05,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:06,225 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:06,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:06,330 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:06,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146370440] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:06,330 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:06,330 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2021-12-21 12:20:06,330 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611079584] [2021-12-21 12:20:06,330 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:06,331 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-12-21 12:20:06,331 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:06,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-12-21 12:20:06,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=381, Invalid=1599, Unknown=0, NotChecked=0, Total=1980 [2021-12-21 12:20:06,331 INFO L87 Difference]: Start difference. First operand 60 states and 70 transitions. Second operand has 45 states, 45 states have (on average 1.9777777777777779) internal successors, (89), 45 states have internal predecessors, (89), 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) [2021-12-21 12:20:06,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:06,708 INFO L93 Difference]: Finished difference Result 129 states and 141 transitions. [2021-12-21 12:20:06,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-21 12:20:06,709 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.9777777777777779) internal successors, (89), 45 states have internal predecessors, (89), 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 43 [2021-12-21 12:20:06,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:06,709 INFO L225 Difference]: With dead ends: 129 [2021-12-21 12:20:06,709 INFO L226 Difference]: Without dead ends: 98 [2021-12-21 12:20:06,710 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1319 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=805, Invalid=3355, Unknown=0, NotChecked=0, Total=4160 [2021-12-21 12:20:06,710 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 39 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:06,710 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 153 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:06,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-12-21 12:20:06,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2021-12-21 12:20:06,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.1833333333333333) internal successors, (71), 60 states have internal predecessors, (71), 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) [2021-12-21 12:20:06,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 71 transitions. [2021-12-21 12:20:06,745 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 71 transitions. Word has length 43 [2021-12-21 12:20:06,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:06,746 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 71 transitions. [2021-12-21 12:20:06,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.9777777777777779) internal successors, (89), 45 states have internal predecessors, (89), 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) [2021-12-21 12:20:06,746 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 71 transitions. [2021-12-21 12:20:06,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-21 12:20:06,746 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:06,746 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:06,779 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:06,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-12-21 12:20:06,964 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:06,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:06,964 INFO L85 PathProgramCache]: Analyzing trace with hash -1788348772, now seen corresponding path program 22 times [2021-12-21 12:20:06,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:06,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272101269] [2021-12-21 12:20:06,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:06,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:06,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:07,171 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:07,171 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:07,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272101269] [2021-12-21 12:20:07,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [272101269] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:07,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1609586646] [2021-12-21 12:20:07,172 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:20:07,172 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:07,172 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:07,180 INFO L229 MonitoredProcess]: Starting monitored process 46 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:07,202 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-12-21 12:20:07,224 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:20:07,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:07,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-21 12:20:07,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:07,595 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 100 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:07,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:07,657 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 100 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:07,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1609586646] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:07,657 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:07,658 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2021-12-21 12:20:07,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129393711] [2021-12-21 12:20:07,658 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:07,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-12-21 12:20:07,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:07,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-12-21 12:20:07,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=1539, Unknown=0, NotChecked=0, Total=1892 [2021-12-21 12:20:07,659 INFO L87 Difference]: Start difference. First operand 61 states and 71 transitions. Second operand has 44 states, 44 states have (on average 2.0) internal successors, (88), 44 states have internal predecessors, (88), 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) [2021-12-21 12:20:08,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:08,018 INFO L93 Difference]: Finished difference Result 166 states and 179 transitions. [2021-12-21 12:20:08,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-12-21 12:20:08,018 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.0) internal successors, (88), 44 states have internal predecessors, (88), 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 43 [2021-12-21 12:20:08,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:08,019 INFO L225 Difference]: With dead ends: 166 [2021-12-21 12:20:08,019 INFO L226 Difference]: Without dead ends: 135 [2021-12-21 12:20:08,019 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1636 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=934, Invalid=4178, Unknown=0, NotChecked=0, Total=5112 [2021-12-21 12:20:08,020 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 74 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:08,020 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 178 Invalid, 302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 246 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:08,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-12-21 12:20:08,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 61. [2021-12-21 12:20:08,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.1833333333333333) internal successors, (71), 60 states have internal predecessors, (71), 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) [2021-12-21 12:20:08,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 71 transitions. [2021-12-21 12:20:08,058 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 71 transitions. Word has length 43 [2021-12-21 12:20:08,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:08,058 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 71 transitions. [2021-12-21 12:20:08,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.0) internal successors, (88), 44 states have internal predecessors, (88), 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) [2021-12-21 12:20:08,058 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 71 transitions. [2021-12-21 12:20:08,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-21 12:20:08,059 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:08,059 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:08,076 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:08,276 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-12-21 12:20:08,276 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:08,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:08,277 INFO L85 PathProgramCache]: Analyzing trace with hash -874168451, now seen corresponding path program 23 times [2021-12-21 12:20:08,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:08,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [756087634] [2021-12-21 12:20:08,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:08,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:08,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:08,443 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 78 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:08,443 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:08,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [756087634] [2021-12-21 12:20:08,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [756087634] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:08,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1929139054] [2021-12-21 12:20:08,443 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:20:08,444 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:08,444 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:08,444 INFO L229 MonitoredProcess]: Starting monitored process 47 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:08,447 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-12-21 12:20:08,505 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2021-12-21 12:20:08,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:08,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-21 12:20:08,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:08,766 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 100 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:08,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:08,829 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 100 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:08,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1929139054] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:08,830 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:08,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 43 [2021-12-21 12:20:08,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972273233] [2021-12-21 12:20:08,830 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:08,830 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-12-21 12:20:08,830 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:08,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-12-21 12:20:08,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=1477, Unknown=0, NotChecked=0, Total=1806 [2021-12-21 12:20:08,831 INFO L87 Difference]: Start difference. First operand 61 states and 71 transitions. Second operand has 43 states, 43 states have (on average 2.0232558139534884) internal successors, (87), 43 states have internal predecessors, (87), 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) [2021-12-21 12:20:09,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:09,273 INFO L93 Difference]: Finished difference Result 202 states and 216 transitions. [2021-12-21 12:20:09,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-12-21 12:20:09,273 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.0232558139534884) internal successors, (87), 43 states have internal predecessors, (87), 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 43 [2021-12-21 12:20:09,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:09,274 INFO L225 Difference]: With dead ends: 202 [2021-12-21 12:20:09,274 INFO L226 Difference]: Without dead ends: 171 [2021-12-21 12:20:09,275 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1897 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1048, Invalid=4804, Unknown=0, NotChecked=0, Total=5852 [2021-12-21 12:20:09,275 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 88 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:09,275 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 230 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:09,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-12-21 12:20:09,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 61. [2021-12-21 12:20:09,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.1833333333333333) internal successors, (71), 60 states have internal predecessors, (71), 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) [2021-12-21 12:20:09,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 71 transitions. [2021-12-21 12:20:09,315 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 71 transitions. Word has length 43 [2021-12-21 12:20:09,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:09,315 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 71 transitions. [2021-12-21 12:20:09,315 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.0232558139534884) internal successors, (87), 43 states have internal predecessors, (87), 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) [2021-12-21 12:20:09,316 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 71 transitions. [2021-12-21 12:20:09,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-21 12:20:09,316 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:09,316 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:09,333 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:09,533 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,47 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:09,533 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:09,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:09,533 INFO L85 PathProgramCache]: Analyzing trace with hash -1675962756, now seen corresponding path program 24 times [2021-12-21 12:20:09,533 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:09,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205727015] [2021-12-21 12:20:09,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:09,534 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:09,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:09,681 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 78 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:09,681 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:09,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205727015] [2021-12-21 12:20:09,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205727015] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:09,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1674221135] [2021-12-21 12:20:09,681 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:20:09,682 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:09,682 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:09,682 INFO L229 MonitoredProcess]: Starting monitored process 48 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:09,683 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-12-21 12:20:09,719 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-12-21 12:20:09,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:09,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-21 12:20:09,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:10,125 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 100 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:10,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:10,229 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 100 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:10,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1674221135] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:10,230 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:10,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 42 [2021-12-21 12:20:10,230 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105157414] [2021-12-21 12:20:10,230 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:10,230 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-12-21 12:20:10,230 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:10,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-12-21 12:20:10,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=1413, Unknown=0, NotChecked=0, Total=1722 [2021-12-21 12:20:10,231 INFO L87 Difference]: Start difference. First operand 61 states and 71 transitions. Second operand has 42 states, 42 states have (on average 2.0476190476190474) internal successors, (86), 42 states have internal predecessors, (86), 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) [2021-12-21 12:20:10,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:10,878 INFO L93 Difference]: Finished difference Result 237 states and 252 transitions. [2021-12-21 12:20:10,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-12-21 12:20:10,878 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.0476190476190474) internal successors, (86), 42 states have internal predecessors, (86), 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 43 [2021-12-21 12:20:10,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:10,879 INFO L225 Difference]: With dead ends: 237 [2021-12-21 12:20:10,879 INFO L226 Difference]: Without dead ends: 206 [2021-12-21 12:20:10,880 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2060 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1122, Invalid=5198, Unknown=0, NotChecked=0, Total=6320 [2021-12-21 12:20:10,880 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 130 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:10,881 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 202 Invalid, 339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:10,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-12-21 12:20:10,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 61. [2021-12-21 12:20:10,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.1833333333333333) internal successors, (71), 60 states have internal predecessors, (71), 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) [2021-12-21 12:20:10,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 71 transitions. [2021-12-21 12:20:10,924 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 71 transitions. Word has length 43 [2021-12-21 12:20:10,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:10,924 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 71 transitions. [2021-12-21 12:20:10,924 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.0476190476190474) internal successors, (86), 42 states have internal predecessors, (86), 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) [2021-12-21 12:20:10,924 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 71 transitions. [2021-12-21 12:20:10,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-21 12:20:10,925 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:10,925 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:10,941 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2021-12-21 12:20:11,130 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-12-21 12:20:11,130 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:11,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:11,130 INFO L85 PathProgramCache]: Analyzing trace with hash -177806435, now seen corresponding path program 25 times [2021-12-21 12:20:11,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:11,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1887186883] [2021-12-21 12:20:11,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:11,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:11,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:11,306 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 78 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:11,307 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:11,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1887186883] [2021-12-21 12:20:11,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1887186883] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:11,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267116888] [2021-12-21 12:20:11,307 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:20:11,307 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:11,308 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:11,308 INFO L229 MonitoredProcess]: Starting monitored process 49 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:11,342 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-12-21 12:20:11,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:11,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-21 12:20:11,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:11,731 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 100 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:11,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:11,827 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 100 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:11,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1267116888] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:11,827 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:11,828 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 41 [2021-12-21 12:20:11,828 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677012943] [2021-12-21 12:20:11,828 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:11,828 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-12-21 12:20:11,828 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:11,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-12-21 12:20:11,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=1347, Unknown=0, NotChecked=0, Total=1640 [2021-12-21 12:20:11,829 INFO L87 Difference]: Start difference. First operand 61 states and 71 transitions. Second operand has 41 states, 41 states have (on average 2.073170731707317) internal successors, (85), 41 states have internal predecessors, (85), 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) [2021-12-21 12:20:12,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:12,480 INFO L93 Difference]: Finished difference Result 271 states and 287 transitions. [2021-12-21 12:20:12,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-12-21 12:20:12,480 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.073170731707317) internal successors, (85), 41 states have internal predecessors, (85), 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 43 [2021-12-21 12:20:12,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:12,481 INFO L225 Difference]: With dead ends: 271 [2021-12-21 12:20:12,481 INFO L226 Difference]: Without dead ends: 240 [2021-12-21 12:20:12,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2115 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1147, Invalid=5333, Unknown=0, NotChecked=0, Total=6480 [2021-12-21 12:20:12,482 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 155 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:12,482 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 195 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:12,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2021-12-21 12:20:12,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 61. [2021-12-21 12:20:12,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.1833333333333333) internal successors, (71), 60 states have internal predecessors, (71), 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) [2021-12-21 12:20:12,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 71 transitions. [2021-12-21 12:20:12,531 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 71 transitions. Word has length 43 [2021-12-21 12:20:12,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:12,531 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 71 transitions. [2021-12-21 12:20:12,531 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.073170731707317) internal successors, (85), 41 states have internal predecessors, (85), 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) [2021-12-21 12:20:12,531 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 71 transitions. [2021-12-21 12:20:12,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-21 12:20:12,531 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:12,532 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:12,548 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2021-12-21 12:20:12,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-12-21 12:20:12,736 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:12,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:12,736 INFO L85 PathProgramCache]: Analyzing trace with hash -406573476, now seen corresponding path program 26 times [2021-12-21 12:20:12,736 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:12,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723837092] [2021-12-21 12:20:12,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:12,737 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:12,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:12,904 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 78 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:12,904 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:12,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723837092] [2021-12-21 12:20:12,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723837092] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:12,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [80542824] [2021-12-21 12:20:12,905 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:20:12,905 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:12,905 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:12,906 INFO L229 MonitoredProcess]: Starting monitored process 50 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:12,907 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-12-21 12:20:12,944 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:20:12,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:12,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-21 12:20:12,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:13,261 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 100 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:13,261 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:13,353 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 100 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:13,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [80542824] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:13,354 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:13,354 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 40 [2021-12-21 12:20:13,354 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197831552] [2021-12-21 12:20:13,354 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:13,354 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-12-21 12:20:13,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:13,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-12-21 12:20:13,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=1279, Unknown=0, NotChecked=0, Total=1560 [2021-12-21 12:20:13,355 INFO L87 Difference]: Start difference. First operand 61 states and 71 transitions. Second operand has 40 states, 40 states have (on average 2.1) internal successors, (84), 40 states have internal predecessors, (84), 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) [2021-12-21 12:20:14,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:14,043 INFO L93 Difference]: Finished difference Result 304 states and 321 transitions. [2021-12-21 12:20:14,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-12-21 12:20:14,043 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.1) internal successors, (84), 40 states have internal predecessors, (84), 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 43 [2021-12-21 12:20:14,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:14,044 INFO L225 Difference]: With dead ends: 304 [2021-12-21 12:20:14,044 INFO L226 Difference]: Without dead ends: 273 [2021-12-21 12:20:14,044 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2053 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1120, Invalid=5200, Unknown=0, NotChecked=0, Total=6320 [2021-12-21 12:20:14,044 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 218 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 389 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:14,045 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 227 Invalid, 389 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 286 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-21 12:20:14,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2021-12-21 12:20:14,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 61. [2021-12-21 12:20:14,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.1833333333333333) internal successors, (71), 60 states have internal predecessors, (71), 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) [2021-12-21 12:20:14,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 71 transitions. [2021-12-21 12:20:14,088 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 71 transitions. Word has length 43 [2021-12-21 12:20:14,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:14,088 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 71 transitions. [2021-12-21 12:20:14,088 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.1) internal successors, (84), 40 states have internal predecessors, (84), 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) [2021-12-21 12:20:14,088 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 71 transitions. [2021-12-21 12:20:14,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-21 12:20:14,088 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:14,089 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:14,105 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:14,299 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-12-21 12:20:14,300 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:14,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:14,300 INFO L85 PathProgramCache]: Analyzing trace with hash -1522331715, now seen corresponding path program 27 times [2021-12-21 12:20:14,300 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:14,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [873424565] [2021-12-21 12:20:14,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:14,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:14,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:14,476 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 78 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:14,476 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:14,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [873424565] [2021-12-21 12:20:14,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [873424565] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:14,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [981180087] [2021-12-21 12:20:14,477 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:20:14,477 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:14,477 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:14,478 INFO L229 MonitoredProcess]: Starting monitored process 51 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:14,479 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-12-21 12:20:14,515 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-12-21 12:20:14,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:14,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-21 12:20:14,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:14,891 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 100 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:14,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:14,964 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 100 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:14,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [981180087] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:14,964 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:14,964 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 39 [2021-12-21 12:20:14,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533325262] [2021-12-21 12:20:14,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:14,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-12-21 12:20:14,965 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:14,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-12-21 12:20:14,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=1209, Unknown=0, NotChecked=0, Total=1482 [2021-12-21 12:20:14,966 INFO L87 Difference]: Start difference. First operand 61 states and 71 transitions. Second operand has 39 states, 39 states have (on average 2.128205128205128) internal successors, (83), 39 states have internal predecessors, (83), 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) [2021-12-21 12:20:15,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:15,603 INFO L93 Difference]: Finished difference Result 336 states and 354 transitions. [2021-12-21 12:20:15,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-12-21 12:20:15,604 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.128205128205128) internal successors, (83), 39 states have internal predecessors, (83), 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 43 [2021-12-21 12:20:15,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:15,605 INFO L225 Difference]: With dead ends: 336 [2021-12-21 12:20:15,605 INFO L226 Difference]: Without dead ends: 305 [2021-12-21 12:20:15,606 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1871 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1044, Invalid=4808, Unknown=0, NotChecked=0, Total=5852 [2021-12-21 12:20:15,606 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 229 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:15,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [229 Valid, 206 Invalid, 344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:15,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2021-12-21 12:20:15,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 61. [2021-12-21 12:20:15,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.1833333333333333) internal successors, (71), 60 states have internal predecessors, (71), 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) [2021-12-21 12:20:15,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 71 transitions. [2021-12-21 12:20:15,653 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 71 transitions. Word has length 43 [2021-12-21 12:20:15,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:15,654 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 71 transitions. [2021-12-21 12:20:15,654 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.128205128205128) internal successors, (83), 39 states have internal predecessors, (83), 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) [2021-12-21 12:20:15,654 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 71 transitions. [2021-12-21 12:20:15,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-21 12:20:15,655 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:15,655 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:15,672 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:15,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2021-12-21 12:20:15,872 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:15,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:15,872 INFO L85 PathProgramCache]: Analyzing trace with hash -1281229252, now seen corresponding path program 28 times [2021-12-21 12:20:15,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:15,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991052665] [2021-12-21 12:20:15,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:15,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:15,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:16,019 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:16,019 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:16,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991052665] [2021-12-21 12:20:16,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1991052665] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:16,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [797455728] [2021-12-21 12:20:16,020 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:20:16,020 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:16,020 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:16,021 INFO L229 MonitoredProcess]: Starting monitored process 52 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:16,022 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-12-21 12:20:16,056 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:20:16,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:16,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-21 12:20:16,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:16,269 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 100 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:16,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:16,378 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 100 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:16,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [797455728] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:16,379 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:16,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 38 [2021-12-21 12:20:16,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695996896] [2021-12-21 12:20:16,379 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:16,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-12-21 12:20:16,380 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:16,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-12-21 12:20:16,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=1137, Unknown=0, NotChecked=0, Total=1406 [2021-12-21 12:20:16,381 INFO L87 Difference]: Start difference. First operand 61 states and 71 transitions. Second operand has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 38 states have internal predecessors, (82), 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) [2021-12-21 12:20:17,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:17,080 INFO L93 Difference]: Finished difference Result 367 states and 386 transitions. [2021-12-21 12:20:17,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-12-21 12:20:17,081 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 38 states have internal predecessors, (82), 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 43 [2021-12-21 12:20:17,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:17,081 INFO L225 Difference]: With dead ends: 367 [2021-12-21 12:20:17,082 INFO L226 Difference]: Without dead ends: 336 [2021-12-21 12:20:17,082 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1557 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=928, Invalid=4184, Unknown=0, NotChecked=0, Total=5112 [2021-12-21 12:20:17,082 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 206 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:17,082 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [206 Valid, 254 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 288 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:17,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2021-12-21 12:20:17,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 61. [2021-12-21 12:20:17,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.1833333333333333) internal successors, (71), 60 states have internal predecessors, (71), 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) [2021-12-21 12:20:17,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 71 transitions. [2021-12-21 12:20:17,130 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 71 transitions. Word has length 43 [2021-12-21 12:20:17,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:17,130 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 71 transitions. [2021-12-21 12:20:17,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.1578947368421053) internal successors, (82), 38 states have internal predecessors, (82), 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) [2021-12-21 12:20:17,131 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 71 transitions. [2021-12-21 12:20:17,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-21 12:20:17,131 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:17,131 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:17,148 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:17,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,52 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:17,348 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:17,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:17,348 INFO L85 PathProgramCache]: Analyzing trace with hash 1081852893, now seen corresponding path program 8 times [2021-12-21 12:20:17,348 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:17,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021554799] [2021-12-21 12:20:17,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:17,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:17,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:17,510 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 78 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:17,510 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:17,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021554799] [2021-12-21 12:20:17,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021554799] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:17,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1611375991] [2021-12-21 12:20:17,510 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:20:17,510 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:17,510 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:17,512 INFO L229 MonitoredProcess]: Starting monitored process 53 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:17,513 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-12-21 12:20:17,549 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:20:17,549 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:17,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-21 12:20:17,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:17,902 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:17,902 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:18,011 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:18,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1611375991] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:18,011 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:18,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 37 [2021-12-21 12:20:18,011 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114927454] [2021-12-21 12:20:18,011 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:18,011 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-12-21 12:20:18,011 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:18,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-12-21 12:20:18,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=1063, Unknown=0, NotChecked=0, Total=1332 [2021-12-21 12:20:18,012 INFO L87 Difference]: Start difference. First operand 61 states and 71 transitions. Second operand has 37 states, 37 states have (on average 2.189189189189189) internal successors, (81), 37 states have internal predecessors, (81), 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) [2021-12-21 12:20:18,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:18,661 INFO L93 Difference]: Finished difference Result 400 states and 421 transitions. [2021-12-21 12:20:18,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-12-21 12:20:18,662 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.189189189189189) internal successors, (81), 37 states have internal predecessors, (81), 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 43 [2021-12-21 12:20:18,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:18,670 INFO L225 Difference]: With dead ends: 400 [2021-12-21 12:20:18,670 INFO L226 Difference]: Without dead ends: 369 [2021-12-21 12:20:18,671 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1177 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=797, Invalid=3363, Unknown=0, NotChecked=0, Total=4160 [2021-12-21 12:20:18,671 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 301 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 301 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:18,673 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [301 Valid, 180 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:18,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2021-12-21 12:20:18,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 63. [2021-12-21 12:20:18,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.1935483870967742) internal successors, (74), 62 states have internal predecessors, (74), 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) [2021-12-21 12:20:18,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2021-12-21 12:20:18,777 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 43 [2021-12-21 12:20:18,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:18,777 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2021-12-21 12:20:18,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.189189189189189) internal successors, (81), 37 states have internal predecessors, (81), 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) [2021-12-21 12:20:18,777 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2021-12-21 12:20:18,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-12-21 12:20:18,778 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:18,778 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:18,795 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:18,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-12-21 12:20:18,986 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:18,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:18,987 INFO L85 PathProgramCache]: Analyzing trace with hash 105717207, now seen corresponding path program 16 times [2021-12-21 12:20:18,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:18,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419301961] [2021-12-21 12:20:18,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:18,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:18,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:19,056 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 36 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:19,057 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:19,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419301961] [2021-12-21 12:20:19,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [419301961] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:19,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108532742] [2021-12-21 12:20:19,057 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:20:19,057 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:19,058 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:19,058 INFO L229 MonitoredProcess]: Starting monitored process 54 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:19,059 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-12-21 12:20:19,093 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:20:19,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:19,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-21 12:20:19,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:19,179 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 45 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:19,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:19,257 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 45 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:19,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108532742] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:19,257 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:19,257 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 15 [2021-12-21 12:20:19,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835373537] [2021-12-21 12:20:19,257 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:19,258 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-21 12:20:19,258 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:19,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-21 12:20:19,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2021-12-21 12:20:19,258 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 15 states have internal predecessors, (52), 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) [2021-12-21 12:20:19,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:19,409 INFO L93 Difference]: Finished difference Result 74 states and 85 transitions. [2021-12-21 12:20:19,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-21 12:20:19,409 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 15 states have internal predecessors, (52), 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 44 [2021-12-21 12:20:19,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:19,409 INFO L225 Difference]: With dead ends: 74 [2021-12-21 12:20:19,410 INFO L226 Difference]: Without dead ends: 72 [2021-12-21 12:20:19,410 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 92 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=228, Invalid=422, Unknown=0, NotChecked=0, Total=650 [2021-12-21 12:20:19,410 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 47 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:19,410 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 154 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:19,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-12-21 12:20:19,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 66. [2021-12-21 12:20:19,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.1846153846153846) internal successors, (77), 65 states have internal predecessors, (77), 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) [2021-12-21 12:20:19,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 77 transitions. [2021-12-21 12:20:19,460 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 77 transitions. Word has length 44 [2021-12-21 12:20:19,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:19,460 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 77 transitions. [2021-12-21 12:20:19,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 15 states have internal predecessors, (52), 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) [2021-12-21 12:20:19,461 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 77 transitions. [2021-12-21 12:20:19,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 12:20:19,461 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:19,461 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:19,478 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:19,677 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,54 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:19,678 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:19,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:19,678 INFO L85 PathProgramCache]: Analyzing trace with hash 1215128889, now seen corresponding path program 17 times [2021-12-21 12:20:19,678 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:19,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815399543] [2021-12-21 12:20:19,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:19,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:19,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:19,821 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 101 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:19,821 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:19,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815399543] [2021-12-21 12:20:19,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815399543] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:19,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [169949040] [2021-12-21 12:20:19,822 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:20:19,822 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:19,822 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:19,823 INFO L229 MonitoredProcess]: Starting monitored process 55 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:19,824 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-12-21 12:20:19,861 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-12-21 12:20:19,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:19,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 12:20:19,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:20,276 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:20,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:20,348 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:20,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [169949040] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:20,349 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:20,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2021-12-21 12:20:20,349 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286528012] [2021-12-21 12:20:20,349 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:20,350 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-12-21 12:20:20,350 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:20,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-12-21 12:20:20,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=1901, Unknown=0, NotChecked=0, Total=2352 [2021-12-21 12:20:20,350 INFO L87 Difference]: Start difference. First operand 66 states and 77 transitions. Second operand has 49 states, 49 states have (on average 1.9795918367346939) internal successors, (97), 49 states have internal predecessors, (97), 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) [2021-12-21 12:20:20,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:20,720 INFO L93 Difference]: Finished difference Result 142 states and 155 transitions. [2021-12-21 12:20:20,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-12-21 12:20:20,720 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.9795918367346939) internal successors, (97), 49 states have internal predecessors, (97), 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 47 [2021-12-21 12:20:20,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:20,721 INFO L225 Difference]: With dead ends: 142 [2021-12-21 12:20:20,721 INFO L226 Difference]: Without dead ends: 108 [2021-12-21 12:20:20,721 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1602 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=950, Invalid=4020, Unknown=0, NotChecked=0, Total=4970 [2021-12-21 12:20:20,721 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 53 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:20,722 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 165 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:20,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-12-21 12:20:20,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 67. [2021-12-21 12:20:20,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.1818181818181819) internal successors, (78), 66 states have internal predecessors, (78), 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) [2021-12-21 12:20:20,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 78 transitions. [2021-12-21 12:20:20,780 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 78 transitions. Word has length 47 [2021-12-21 12:20:20,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:20,781 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 78 transitions. [2021-12-21 12:20:20,781 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.9795918367346939) internal successors, (97), 49 states have internal predecessors, (97), 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) [2021-12-21 12:20:20,781 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 78 transitions. [2021-12-21 12:20:20,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 12:20:20,781 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:20,781 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:20,799 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:20,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,55 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:20,999 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:20,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:20,999 INFO L85 PathProgramCache]: Analyzing trace with hash -185630472, now seen corresponding path program 29 times [2021-12-21 12:20:20,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:20,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [87512920] [2021-12-21 12:20:20,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:21,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:21,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:21,165 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 101 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:21,166 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:21,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [87512920] [2021-12-21 12:20:21,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [87512920] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:21,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146300874] [2021-12-21 12:20:21,166 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:20:21,166 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:21,167 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:21,167 INFO L229 MonitoredProcess]: Starting monitored process 56 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:21,169 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-12-21 12:20:21,207 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-12-21 12:20:21,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:21,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 12:20:21,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:21,681 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 126 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:21,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:21,776 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 126 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:21,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146300874] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:21,777 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:21,777 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2021-12-21 12:20:21,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044695249] [2021-12-21 12:20:21,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:21,778 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-12-21 12:20:21,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:21,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-12-21 12:20:21,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=420, Invalid=1836, Unknown=0, NotChecked=0, Total=2256 [2021-12-21 12:20:21,791 INFO L87 Difference]: Start difference. First operand 67 states and 78 transitions. Second operand has 48 states, 48 states have (on average 2.0) internal successors, (96), 48 states have internal predecessors, (96), 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) [2021-12-21 12:20:22,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:22,319 INFO L93 Difference]: Finished difference Result 183 states and 197 transitions. [2021-12-21 12:20:22,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-12-21 12:20:22,320 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.0) internal successors, (96), 48 states have internal predecessors, (96), 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 47 [2021-12-21 12:20:22,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:22,320 INFO L225 Difference]: With dead ends: 183 [2021-12-21 12:20:22,320 INFO L226 Difference]: Without dead ends: 149 [2021-12-21 12:20:22,321 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2005 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1114, Invalid=5048, Unknown=0, NotChecked=0, Total=6162 [2021-12-21 12:20:22,321 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 68 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:22,321 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 215 Invalid, 361 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 306 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:22,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-12-21 12:20:22,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 67. [2021-12-21 12:20:22,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.1818181818181819) internal successors, (78), 66 states have internal predecessors, (78), 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) [2021-12-21 12:20:22,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 78 transitions. [2021-12-21 12:20:22,400 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 78 transitions. Word has length 47 [2021-12-21 12:20:22,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:22,400 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 78 transitions. [2021-12-21 12:20:22,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.0) internal successors, (96), 48 states have internal predecessors, (96), 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) [2021-12-21 12:20:22,400 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 78 transitions. [2021-12-21 12:20:22,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 12:20:22,400 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:22,401 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:22,418 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:22,617 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,56 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:22,618 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:22,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:22,618 INFO L85 PathProgramCache]: Analyzing trace with hash -1477742247, now seen corresponding path program 30 times [2021-12-21 12:20:22,618 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:22,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044310915] [2021-12-21 12:20:22,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:22,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:22,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:22,806 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 101 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:22,806 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:22,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044310915] [2021-12-21 12:20:22,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044310915] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:22,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [544739793] [2021-12-21 12:20:22,806 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:20:22,807 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:22,807 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:22,808 INFO L229 MonitoredProcess]: Starting monitored process 57 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:22,809 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-12-21 12:20:22,847 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-12-21 12:20:22,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:22,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 12:20:22,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:23,266 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 126 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:23,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:23,332 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 126 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:23,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [544739793] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:23,333 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:23,333 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 47 [2021-12-21 12:20:23,333 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419533179] [2021-12-21 12:20:23,333 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:23,334 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-12-21 12:20:23,334 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:23,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-12-21 12:20:23,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=393, Invalid=1769, Unknown=0, NotChecked=0, Total=2162 [2021-12-21 12:20:23,335 INFO L87 Difference]: Start difference. First operand 67 states and 78 transitions. Second operand has 47 states, 47 states have (on average 2.021276595744681) internal successors, (95), 47 states have internal predecessors, (95), 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) [2021-12-21 12:20:23,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:23,910 INFO L93 Difference]: Finished difference Result 223 states and 238 transitions. [2021-12-21 12:20:23,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-12-21 12:20:23,910 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.021276595744681) internal successors, (95), 47 states have internal predecessors, (95), 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 47 [2021-12-21 12:20:23,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:23,911 INFO L225 Difference]: With dead ends: 223 [2021-12-21 12:20:23,911 INFO L226 Difference]: Without dead ends: 189 [2021-12-21 12:20:23,912 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2355 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1266, Invalid=5874, Unknown=0, NotChecked=0, Total=7140 [2021-12-21 12:20:23,912 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 76 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 381 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:23,912 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 232 Invalid, 381 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:23,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-12-21 12:20:23,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 67. [2021-12-21 12:20:23,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.1818181818181819) internal successors, (78), 66 states have internal predecessors, (78), 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) [2021-12-21 12:20:23,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 78 transitions. [2021-12-21 12:20:23,976 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 78 transitions. Word has length 47 [2021-12-21 12:20:23,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:23,976 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 78 transitions. [2021-12-21 12:20:23,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.021276595744681) internal successors, (95), 47 states have internal predecessors, (95), 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) [2021-12-21 12:20:23,977 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 78 transitions. [2021-12-21 12:20:23,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 12:20:23,977 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:23,977 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:23,995 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:24,184 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,57 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:24,184 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:24,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:24,185 INFO L85 PathProgramCache]: Analyzing trace with hash -1519423272, now seen corresponding path program 31 times [2021-12-21 12:20:24,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:24,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239243832] [2021-12-21 12:20:24,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:24,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:24,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:24,417 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 101 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:24,417 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:24,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239243832] [2021-12-21 12:20:24,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [239243832] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:24,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737788333] [2021-12-21 12:20:24,417 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:20:24,417 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:24,418 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:24,418 INFO L229 MonitoredProcess]: Starting monitored process 58 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:24,419 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-12-21 12:20:24,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:24,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 12:20:24,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:24,739 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 126 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:24,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:24,834 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 126 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:24,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737788333] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:24,835 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:24,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 46 [2021-12-21 12:20:24,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636295106] [2021-12-21 12:20:24,835 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:24,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-12-21 12:20:24,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:24,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-12-21 12:20:24,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=1700, Unknown=0, NotChecked=0, Total=2070 [2021-12-21 12:20:24,836 INFO L87 Difference]: Start difference. First operand 67 states and 78 transitions. Second operand has 46 states, 46 states have (on average 2.0434782608695654) internal successors, (94), 46 states have internal predecessors, (94), 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) [2021-12-21 12:20:25,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:25,618 INFO L93 Difference]: Finished difference Result 262 states and 278 transitions. [2021-12-21 12:20:25,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-12-21 12:20:25,619 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.0434782608695654) internal successors, (94), 46 states have internal predecessors, (94), 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 47 [2021-12-21 12:20:25,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:25,619 INFO L225 Difference]: With dead ends: 262 [2021-12-21 12:20:25,620 INFO L226 Difference]: Without dead ends: 228 [2021-12-21 12:20:25,620 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2603 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1377, Invalid=6455, Unknown=0, NotChecked=0, Total=7832 [2021-12-21 12:20:25,620 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 105 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 418 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:25,621 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 257 Invalid, 418 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:25,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-12-21 12:20:25,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 67. [2021-12-21 12:20:25,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.1818181818181819) internal successors, (78), 66 states have internal predecessors, (78), 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) [2021-12-21 12:20:25,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 78 transitions. [2021-12-21 12:20:25,686 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 78 transitions. Word has length 47 [2021-12-21 12:20:25,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:25,686 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 78 transitions. [2021-12-21 12:20:25,686 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.0434782608695654) internal successors, (94), 46 states have internal predecessors, (94), 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) [2021-12-21 12:20:25,687 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 78 transitions. [2021-12-21 12:20:25,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 12:20:25,687 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:25,687 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:25,704 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:25,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-12-21 12:20:25,889 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:25,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:25,890 INFO L85 PathProgramCache]: Analyzing trace with hash 834536825, now seen corresponding path program 32 times [2021-12-21 12:20:25,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:25,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708213768] [2021-12-21 12:20:25,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:25,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:25,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:26,096 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 101 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:26,096 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:26,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1708213768] [2021-12-21 12:20:26,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1708213768] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:26,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [533519775] [2021-12-21 12:20:26,096 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:20:26,096 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:26,096 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:26,097 INFO L229 MonitoredProcess]: Starting monitored process 59 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:26,098 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-12-21 12:20:26,132 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:20:26,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:26,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 12:20:26,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:26,605 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 126 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:26,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:26,728 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 126 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:26,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [533519775] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:26,728 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:26,728 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 45 [2021-12-21 12:20:26,728 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526370024] [2021-12-21 12:20:26,729 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:26,729 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-12-21 12:20:26,729 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:26,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-12-21 12:20:26,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=1629, Unknown=0, NotChecked=0, Total=1980 [2021-12-21 12:20:26,730 INFO L87 Difference]: Start difference. First operand 67 states and 78 transitions. Second operand has 45 states, 45 states have (on average 2.066666666666667) internal successors, (93), 45 states have internal predecessors, (93), 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) [2021-12-21 12:20:27,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:27,514 INFO L93 Difference]: Finished difference Result 300 states and 317 transitions. [2021-12-21 12:20:27,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-12-21 12:20:27,514 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.066666666666667) internal successors, (93), 45 states have internal predecessors, (93), 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 47 [2021-12-21 12:20:27,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:27,515 INFO L225 Difference]: With dead ends: 300 [2021-12-21 12:20:27,515 INFO L226 Difference]: Without dead ends: 266 [2021-12-21 12:20:27,516 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2734 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1435, Invalid=6755, Unknown=0, NotChecked=0, Total=8190 [2021-12-21 12:20:27,516 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 158 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 326 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 430 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 326 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:27,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 256 Invalid, 430 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 326 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:27,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-12-21 12:20:27,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 67. [2021-12-21 12:20:27,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.1818181818181819) internal successors, (78), 66 states have internal predecessors, (78), 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) [2021-12-21 12:20:27,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 78 transitions. [2021-12-21 12:20:27,592 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 78 transitions. Word has length 47 [2021-12-21 12:20:27,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:27,592 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 78 transitions. [2021-12-21 12:20:27,592 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.066666666666667) internal successors, (93), 45 states have internal predecessors, (93), 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) [2021-12-21 12:20:27,592 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 78 transitions. [2021-12-21 12:20:27,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 12:20:27,593 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:27,593 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:27,609 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2021-12-21 12:20:27,800 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-12-21 12:20:27,801 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:27,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:27,801 INFO L85 PathProgramCache]: Analyzing trace with hash -890644296, now seen corresponding path program 33 times [2021-12-21 12:20:27,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:27,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198297665] [2021-12-21 12:20:27,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:27,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:27,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:27,946 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 101 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:27,946 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:27,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198297665] [2021-12-21 12:20:27,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198297665] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:27,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1710686887] [2021-12-21 12:20:27,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:20:27,947 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:27,947 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:27,948 INFO L229 MonitoredProcess]: Starting monitored process 60 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:27,949 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-12-21 12:20:27,986 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-12-21 12:20:27,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:27,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 12:20:27,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:28,247 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 126 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:28,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:28,312 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 126 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:28,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1710686887] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:28,312 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:28,312 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 44 [2021-12-21 12:20:28,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475614603] [2021-12-21 12:20:28,313 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:28,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-12-21 12:20:28,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:28,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-12-21 12:20:28,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=336, Invalid=1556, Unknown=0, NotChecked=0, Total=1892 [2021-12-21 12:20:28,314 INFO L87 Difference]: Start difference. First operand 67 states and 78 transitions. Second operand has 44 states, 44 states have (on average 2.090909090909091) internal successors, (92), 44 states have internal predecessors, (92), 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) [2021-12-21 12:20:29,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:29,111 INFO L93 Difference]: Finished difference Result 337 states and 355 transitions. [2021-12-21 12:20:29,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-12-21 12:20:29,111 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.090909090909091) internal successors, (92), 44 states have internal predecessors, (92), 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 47 [2021-12-21 12:20:29,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:29,112 INFO L225 Difference]: With dead ends: 337 [2021-12-21 12:20:29,112 INFO L226 Difference]: Without dead ends: 303 [2021-12-21 12:20:29,113 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2734 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1434, Invalid=6756, Unknown=0, NotChecked=0, Total=8190 [2021-12-21 12:20:29,113 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 177 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:29,113 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [177 Valid, 236 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:29,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2021-12-21 12:20:29,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 67. [2021-12-21 12:20:29,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.1818181818181819) internal successors, (78), 66 states have internal predecessors, (78), 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) [2021-12-21 12:20:29,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 78 transitions. [2021-12-21 12:20:29,181 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 78 transitions. Word has length 47 [2021-12-21 12:20:29,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:29,182 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 78 transitions. [2021-12-21 12:20:29,182 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.090909090909091) internal successors, (92), 44 states have internal predecessors, (92), 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) [2021-12-21 12:20:29,182 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 78 transitions. [2021-12-21 12:20:29,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 12:20:29,182 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:29,182 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:29,199 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:29,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-12-21 12:20:29,399 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:29,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:29,400 INFO L85 PathProgramCache]: Analyzing trace with hash 23536025, now seen corresponding path program 34 times [2021-12-21 12:20:29,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:29,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1014510324] [2021-12-21 12:20:29,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:29,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:29,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:29,594 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 101 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:29,595 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:29,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1014510324] [2021-12-21 12:20:29,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1014510324] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:29,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [650867194] [2021-12-21 12:20:29,595 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-21 12:20:29,595 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:29,595 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:29,596 INFO L229 MonitoredProcess]: Starting monitored process 61 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:29,598 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-12-21 12:20:29,636 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-21 12:20:29,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:29,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 12:20:29,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:30,074 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 126 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:30,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:30,149 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 126 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:30,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [650867194] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:30,150 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:30,150 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 43 [2021-12-21 12:20:30,150 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912332179] [2021-12-21 12:20:30,150 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:30,150 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-12-21 12:20:30,150 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:30,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-12-21 12:20:30,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=1481, Unknown=0, NotChecked=0, Total=1806 [2021-12-21 12:20:30,159 INFO L87 Difference]: Start difference. First operand 67 states and 78 transitions. Second operand has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 43 states have internal predecessors, (91), 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) [2021-12-21 12:20:30,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:31,000 INFO L93 Difference]: Finished difference Result 373 states and 392 transitions. [2021-12-21 12:20:31,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-12-21 12:20:31,000 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 43 states have internal predecessors, (91), 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 47 [2021-12-21 12:20:31,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:31,001 INFO L225 Difference]: With dead ends: 373 [2021-12-21 12:20:31,001 INFO L226 Difference]: Without dead ends: 339 [2021-12-21 12:20:31,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2597 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1374, Invalid=6458, Unknown=0, NotChecked=0, Total=7832 [2021-12-21 12:20:31,025 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 190 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 301 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 404 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 301 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:31,025 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [190 Valid, 247 Invalid, 404 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 301 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:31,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2021-12-21 12:20:31,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 67. [2021-12-21 12:20:31,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.1818181818181819) internal successors, (78), 66 states have internal predecessors, (78), 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) [2021-12-21 12:20:31,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 78 transitions. [2021-12-21 12:20:31,111 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 78 transitions. Word has length 47 [2021-12-21 12:20:31,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:31,111 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 78 transitions. [2021-12-21 12:20:31,111 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 43 states have internal predecessors, (91), 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) [2021-12-21 12:20:31,111 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 78 transitions. [2021-12-21 12:20:31,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 12:20:31,112 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:31,112 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:31,128 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Ended with exit code 0 [2021-12-21 12:20:31,325 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,61 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:31,326 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:31,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:31,326 INFO L85 PathProgramCache]: Analyzing trace with hash -778258280, now seen corresponding path program 35 times [2021-12-21 12:20:31,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:31,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444842455] [2021-12-21 12:20:31,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:31,327 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:31,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:31,521 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 101 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:31,521 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:31,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444842455] [2021-12-21 12:20:31,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444842455] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:31,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [899219119] [2021-12-21 12:20:31,521 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-21 12:20:31,521 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:31,521 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:31,522 INFO L229 MonitoredProcess]: Starting monitored process 62 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:31,523 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-12-21 12:20:31,560 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-12-21 12:20:31,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:31,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 12:20:31,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:31,911 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 126 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:31,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:32,006 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 126 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:32,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [899219119] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:32,006 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:32,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 42 [2021-12-21 12:20:32,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642804685] [2021-12-21 12:20:32,006 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:32,007 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-12-21 12:20:32,007 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:32,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-12-21 12:20:32,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=1404, Unknown=0, NotChecked=0, Total=1722 [2021-12-21 12:20:32,007 INFO L87 Difference]: Start difference. First operand 67 states and 78 transitions. Second operand has 42 states, 42 states have (on average 2.142857142857143) internal successors, (90), 42 states have internal predecessors, (90), 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) [2021-12-21 12:20:32,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:32,912 INFO L93 Difference]: Finished difference Result 408 states and 428 transitions. [2021-12-21 12:20:32,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-12-21 12:20:32,913 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.142857142857143) internal successors, (90), 42 states have internal predecessors, (90), 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 47 [2021-12-21 12:20:32,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:32,914 INFO L225 Difference]: With dead ends: 408 [2021-12-21 12:20:32,914 INFO L226 Difference]: Without dead ends: 374 [2021-12-21 12:20:32,915 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2325 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1261, Invalid=5879, Unknown=0, NotChecked=0, Total=7140 [2021-12-21 12:20:32,915 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 221 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:32,915 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [221 Valid, 265 Invalid, 398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 312 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:32,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-12-21 12:20:32,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 67. [2021-12-21 12:20:32,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.1818181818181819) internal successors, (78), 66 states have internal predecessors, (78), 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) [2021-12-21 12:20:32,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 78 transitions. [2021-12-21 12:20:32,985 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 78 transitions. Word has length 47 [2021-12-21 12:20:32,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:32,985 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 78 transitions. [2021-12-21 12:20:32,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.142857142857143) internal successors, (90), 42 states have internal predecessors, (90), 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) [2021-12-21 12:20:32,985 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 78 transitions. [2021-12-21 12:20:32,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 12:20:32,986 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:32,986 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:33,002 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:33,191 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,62 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:33,192 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:33,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:33,192 INFO L85 PathProgramCache]: Analyzing trace with hash 719898041, now seen corresponding path program 36 times [2021-12-21 12:20:33,192 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:33,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [265247584] [2021-12-21 12:20:33,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:33,192 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:33,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:33,374 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 101 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:33,374 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:33,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [265247584] [2021-12-21 12:20:33,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [265247584] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:33,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [352798773] [2021-12-21 12:20:33,375 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:20:33,375 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:33,375 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:33,376 INFO L229 MonitoredProcess]: Starting monitored process 63 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:33,377 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-12-21 12:20:33,414 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-12-21 12:20:33,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:33,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 12:20:33,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:33,737 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 126 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:33,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:33,802 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 126 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:33,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [352798773] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:33,803 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:33,803 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 41 [2021-12-21 12:20:33,803 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003712732] [2021-12-21 12:20:33,803 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:33,803 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-12-21 12:20:33,804 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:33,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-12-21 12:20:33,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=315, Invalid=1325, Unknown=0, NotChecked=0, Total=1640 [2021-12-21 12:20:33,804 INFO L87 Difference]: Start difference. First operand 67 states and 78 transitions. Second operand has 41 states, 41 states have (on average 2.1707317073170733) internal successors, (89), 41 states have internal predecessors, (89), 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) [2021-12-21 12:20:34,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:34,659 INFO L93 Difference]: Finished difference Result 442 states and 463 transitions. [2021-12-21 12:20:34,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-12-21 12:20:34,659 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.1707317073170733) internal successors, (89), 41 states have internal predecessors, (89), 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 47 [2021-12-21 12:20:34,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:34,660 INFO L225 Difference]: With dead ends: 442 [2021-12-21 12:20:34,660 INFO L226 Difference]: Without dead ends: 408 [2021-12-21 12:20:34,661 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1910 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1107, Invalid=5055, Unknown=0, NotChecked=0, Total=6162 [2021-12-21 12:20:34,661 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 277 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 277 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:34,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [277 Valid, 236 Invalid, 358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:34,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2021-12-21 12:20:34,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 67. [2021-12-21 12:20:34,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.1818181818181819) internal successors, (78), 66 states have internal predecessors, (78), 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) [2021-12-21 12:20:34,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 78 transitions. [2021-12-21 12:20:34,735 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 78 transitions. Word has length 47 [2021-12-21 12:20:34,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:34,735 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 78 transitions. [2021-12-21 12:20:34,735 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.1707317073170733) internal successors, (89), 41 states have internal predecessors, (89), 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) [2021-12-21 12:20:34,735 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 78 transitions. [2021-12-21 12:20:34,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-21 12:20:34,736 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:34,736 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:34,752 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Ended with exit code 0 [2021-12-21 12:20:34,952 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,63 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:34,952 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:34,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:34,953 INFO L85 PathProgramCache]: Analyzing trace with hash 491131000, now seen corresponding path program 9 times [2021-12-21 12:20:34,953 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:34,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [124809273] [2021-12-21 12:20:34,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:34,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:34,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:35,121 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 101 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:35,121 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:35,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [124809273] [2021-12-21 12:20:35,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [124809273] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:35,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666519065] [2021-12-21 12:20:35,121 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-21 12:20:35,121 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:35,121 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:35,122 INFO L229 MonitoredProcess]: Starting monitored process 64 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:35,123 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-12-21 12:20:35,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-12-21 12:20:35,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:35,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-21 12:20:35,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:35,404 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:35,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:35,470 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:35,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666519065] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:35,470 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:35,470 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 40 [2021-12-21 12:20:35,470 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336187533] [2021-12-21 12:20:35,470 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:35,470 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-12-21 12:20:35,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:35,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-12-21 12:20:35,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=1244, Unknown=0, NotChecked=0, Total=1560 [2021-12-21 12:20:35,471 INFO L87 Difference]: Start difference. First operand 67 states and 78 transitions. Second operand has 40 states, 40 states have (on average 2.2) internal successors, (88), 40 states have internal predecessors, (88), 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) [2021-12-21 12:20:36,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:36,405 INFO L93 Difference]: Finished difference Result 478 states and 501 transitions. [2021-12-21 12:20:36,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-12-21 12:20:36,406 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.2) internal successors, (88), 40 states have internal predecessors, (88), 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 47 [2021-12-21 12:20:36,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:36,420 INFO L225 Difference]: With dead ends: 478 [2021-12-21 12:20:36,424 INFO L226 Difference]: Without dead ends: 444 [2021-12-21 12:20:36,424 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1428 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=941, Invalid=4029, Unknown=0, NotChecked=0, Total=4970 [2021-12-21 12:20:36,425 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 394 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 394 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:36,425 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [394 Valid, 211 Invalid, 319 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 269 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:36,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 444 states. [2021-12-21 12:20:36,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 444 to 69. [2021-12-21 12:20:36,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.1911764705882353) internal successors, (81), 68 states have internal predecessors, (81), 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) [2021-12-21 12:20:36,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 81 transitions. [2021-12-21 12:20:36,508 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 81 transitions. Word has length 47 [2021-12-21 12:20:36,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:36,508 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 81 transitions. [2021-12-21 12:20:36,508 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.2) internal successors, (88), 40 states have internal predecessors, (88), 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) [2021-12-21 12:20:36,508 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 81 transitions. [2021-12-21 12:20:36,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-21 12:20:36,508 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:36,509 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:36,525 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Ended with exit code 0 [2021-12-21 12:20:36,723 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2021-12-21 12:20:36,724 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:36,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:36,724 INFO L85 PathProgramCache]: Analyzing trace with hash -1809280333, now seen corresponding path program 18 times [2021-12-21 12:20:36,724 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:36,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437619484] [2021-12-21 12:20:36,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:36,725 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:36,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:36,837 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 45 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:36,838 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:36,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437619484] [2021-12-21 12:20:36,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1437619484] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:36,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [452761567] [2021-12-21 12:20:36,838 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-21 12:20:36,839 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:36,839 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:36,852 INFO L229 MonitoredProcess]: Starting monitored process 65 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:36,853 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-12-21 12:20:36,891 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-12-21 12:20:36,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:36,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 23 conjunts are in the unsatisfiable core [2021-12-21 12:20:36,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:36,974 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 55 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:36,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:37,053 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 55 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:37,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [452761567] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:37,054 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:37,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 16 [2021-12-21 12:20:37,056 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097180222] [2021-12-21 12:20:37,056 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:37,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-21 12:20:37,057 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:37,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-21 12:20:37,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2021-12-21 12:20:37,057 INFO L87 Difference]: Start difference. First operand 69 states and 81 transitions. Second operand has 16 states, 16 states have (on average 3.5) internal successors, (56), 16 states have internal predecessors, (56), 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) [2021-12-21 12:20:37,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:37,274 INFO L93 Difference]: Finished difference Result 80 states and 92 transitions. [2021-12-21 12:20:37,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-21 12:20:37,274 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.5) internal successors, (56), 16 states have internal predecessors, (56), 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 48 [2021-12-21 12:20:37,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:37,274 INFO L225 Difference]: With dead ends: 80 [2021-12-21 12:20:37,275 INFO L226 Difference]: Without dead ends: 78 [2021-12-21 12:20:37,275 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=266, Invalid=490, Unknown=0, NotChecked=0, Total=756 [2021-12-21 12:20:37,275 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 62 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:37,275 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 182 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:37,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-12-21 12:20:37,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 72. [2021-12-21 12:20:37,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.1830985915492958) internal successors, (84), 71 states have internal predecessors, (84), 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) [2021-12-21 12:20:37,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 84 transitions. [2021-12-21 12:20:37,384 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 84 transitions. Word has length 48 [2021-12-21 12:20:37,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:37,384 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 84 transitions. [2021-12-21 12:20:37,384 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.5) internal successors, (56), 16 states have internal predecessors, (56), 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) [2021-12-21 12:20:37,384 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 84 transitions. [2021-12-21 12:20:37,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-21 12:20:37,385 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:37,385 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:37,427 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:37,600 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,65 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:37,600 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:37,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:37,601 INFO L85 PathProgramCache]: Analyzing trace with hash 1574007517, now seen corresponding path program 19 times [2021-12-21 12:20:37,601 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:37,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322300860] [2021-12-21 12:20:37,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:37,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:37,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:37,819 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 127 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:37,820 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:37,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322300860] [2021-12-21 12:20:37,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322300860] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:37,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1775306623] [2021-12-21 12:20:37,820 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:20:37,820 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:37,820 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:37,821 INFO L229 MonitoredProcess]: Starting monitored process 66 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:37,822 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-12-21 12:20:37,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:37,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-21 12:20:37,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:38,442 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:38,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:38,559 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:38,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1775306623] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:38,559 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:38,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2021-12-21 12:20:38,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669184574] [2021-12-21 12:20:38,559 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:38,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-12-21 12:20:38,559 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:38,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-12-21 12:20:38,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=527, Invalid=2229, Unknown=0, NotChecked=0, Total=2756 [2021-12-21 12:20:38,560 INFO L87 Difference]: Start difference. First operand 72 states and 84 transitions. Second operand has 53 states, 53 states have (on average 1.9811320754716981) internal successors, (105), 53 states have internal predecessors, (105), 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) [2021-12-21 12:20:39,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:39,012 INFO L93 Difference]: Finished difference Result 155 states and 169 transitions. [2021-12-21 12:20:39,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-21 12:20:39,013 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.9811320754716981) internal successors, (105), 53 states have internal predecessors, (105), 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 51 [2021-12-21 12:20:39,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:39,013 INFO L225 Difference]: With dead ends: 155 [2021-12-21 12:20:39,013 INFO L226 Difference]: Without dead ends: 118 [2021-12-21 12:20:39,014 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1912 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1107, Invalid=4745, Unknown=0, NotChecked=0, Total=5852 [2021-12-21 12:20:39,014 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 44 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:39,014 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 188 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:39,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-12-21 12:20:39,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 73. [2021-12-21 12:20:39,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.1805555555555556) internal successors, (85), 72 states have internal predecessors, (85), 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) [2021-12-21 12:20:39,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 85 transitions. [2021-12-21 12:20:39,106 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 85 transitions. Word has length 51 [2021-12-21 12:20:39,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:39,106 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 85 transitions. [2021-12-21 12:20:39,106 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.9811320754716981) internal successors, (105), 53 states have internal predecessors, (105), 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) [2021-12-21 12:20:39,106 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 85 transitions. [2021-12-21 12:20:39,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-21 12:20:39,107 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:39,107 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:39,123 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2021-12-21 12:20:39,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2021-12-21 12:20:39,324 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:39,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:39,324 INFO L85 PathProgramCache]: Analyzing trace with hash -2142136548, now seen corresponding path program 37 times [2021-12-21 12:20:39,325 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:39,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1340215986] [2021-12-21 12:20:39,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:39,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:39,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:39,554 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 127 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:39,555 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:39,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1340215986] [2021-12-21 12:20:39,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1340215986] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:39,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15813285] [2021-12-21 12:20:39,555 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-21 12:20:39,555 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:39,555 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:39,556 INFO L229 MonitoredProcess]: Starting monitored process 67 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:39,557 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-12-21 12:20:39,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:39,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-21 12:20:39,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:40,118 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 155 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:40,118 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:40,220 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 155 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:40,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [15813285] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:40,220 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:40,220 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2021-12-21 12:20:40,220 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625066245] [2021-12-21 12:20:40,220 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:40,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-12-21 12:20:40,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:40,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-12-21 12:20:40,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=493, Invalid=2159, Unknown=0, NotChecked=0, Total=2652 [2021-12-21 12:20:40,221 INFO L87 Difference]: Start difference. First operand 73 states and 85 transitions. Second operand has 52 states, 52 states have (on average 2.0) internal successors, (104), 52 states have internal predecessors, (104), 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) [2021-12-21 12:20:40,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-21 12:20:40,847 INFO L93 Difference]: Finished difference Result 200 states and 215 transitions. [2021-12-21 12:20:40,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-12-21 12:20:40,847 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.0) internal successors, (104), 52 states have internal predecessors, (104), 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 51 [2021-12-21 12:20:40,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-21 12:20:40,848 INFO L225 Difference]: With dead ends: 200 [2021-12-21 12:20:40,848 INFO L226 Difference]: Without dead ends: 163 [2021-12-21 12:20:40,848 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2411 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1310, Invalid=6000, Unknown=0, NotChecked=0, Total=7310 [2021-12-21 12:20:40,849 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 67 mSDsluCounter, 191 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 371 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-21 12:20:40,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 215 Invalid, 371 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-21 12:20:40,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-12-21 12:20:40,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 73. [2021-12-21 12:20:40,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.1805555555555556) internal successors, (85), 72 states have internal predecessors, (85), 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) [2021-12-21 12:20:40,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 85 transitions. [2021-12-21 12:20:40,945 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 85 transitions. Word has length 51 [2021-12-21 12:20:40,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-21 12:20:40,945 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 85 transitions. [2021-12-21 12:20:40,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.0) internal successors, (104), 52 states have internal predecessors, (104), 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) [2021-12-21 12:20:40,945 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 85 transitions. [2021-12-21 12:20:40,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-21 12:20:40,946 INFO L506 BasicCegarLoop]: Found error trace [2021-12-21 12:20:40,946 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-21 12:20:40,962 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2021-12-21 12:20:41,160 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-12-21 12:20:41,161 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-21 12:20:41,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-21 12:20:41,161 INFO L85 PathProgramCache]: Analyzing trace with hash 2032955133, now seen corresponding path program 38 times [2021-12-21 12:20:41,161 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-21 12:20:41,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528900669] [2021-12-21 12:20:41,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-21 12:20:41,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-21 12:20:41,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-21 12:20:41,381 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 127 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:41,381 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-21 12:20:41,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528900669] [2021-12-21 12:20:41,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [528900669] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-21 12:20:41,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946749628] [2021-12-21 12:20:41,381 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-21 12:20:41,381 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-21 12:20:41,381 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-21 12:20:41,382 INFO L229 MonitoredProcess]: Starting monitored process 68 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-21 12:20:41,383 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-12-21 12:20:41,419 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-21 12:20:41,419 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-21 12:20:41,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-21 12:20:41,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-21 12:20:41,886 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 155 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:41,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-21 12:20:42,003 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 155 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-21 12:20:42,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [946749628] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-21 12:20:42,003 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-21 12:20:42,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 51 [2021-12-21 12:20:42,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119020609] [2021-12-21 12:20:42,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-21 12:20:42,004 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-12-21 12:20:42,004 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-21 12:20:42,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-12-21 12:20:42,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=2087, Unknown=0, NotChecked=0, Total=2550 [2021-12-21 12:20:42,005 INFO L87 Difference]: Start difference. First operand 73 states and 85 transitions. Second operand has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 51 states have internal predecessors, (103), 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)