./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/list-properties/list_search-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/list-properties/list_search-2.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash b1ea7ddff382751fa0e11562333bdb4981cac7bdbf1d356a007804e7e2e5a289 --- Real Ultimate output --- This is Ultimate 0.2.2-839c364b5d67a0f615c82cb70ab247790648d4a9-839c364 [2021-12-14 13:36:19,890 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-14 13:36:19,891 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-14 13:36:19,915 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-14 13:36:19,915 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-14 13:36:19,918 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-14 13:36:19,919 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-14 13:36:19,921 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-14 13:36:19,923 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-14 13:36:19,926 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-14 13:36:19,927 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-14 13:36:19,928 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-14 13:36:19,928 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-14 13:36:19,930 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-14 13:36:19,935 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-14 13:36:19,936 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-14 13:36:19,937 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-14 13:36:19,937 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-14 13:36:19,940 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-14 13:36:19,944 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-14 13:36:19,945 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-14 13:36:19,946 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-14 13:36:19,947 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-14 13:36:19,948 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-14 13:36:19,952 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-14 13:36:19,953 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-14 13:36:19,953 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-14 13:36:19,954 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-14 13:36:19,954 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-14 13:36:19,955 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-14 13:36:19,955 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-14 13:36:19,956 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-14 13:36:19,957 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-14 13:36:19,958 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-14 13:36:19,959 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-14 13:36:19,960 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-14 13:36:19,960 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-14 13:36:19,960 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-14 13:36:19,961 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-14 13:36:19,961 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-14 13:36:19,961 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-14 13:36:19,962 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-14 13:36:19,992 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-14 13:36:19,993 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-14 13:36:19,993 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-14 13:36:19,993 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-14 13:36:19,994 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-14 13:36:19,994 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-14 13:36:19,995 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-14 13:36:19,995 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-14 13:36:19,995 INFO L138 SettingsManager]: * Use SBE=true [2021-12-14 13:36:19,995 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-14 13:36:19,996 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-14 13:36:19,996 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-14 13:36:19,996 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-14 13:36:19,996 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-14 13:36:19,996 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-14 13:36:20,001 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-14 13:36:20,001 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-14 13:36:20,002 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-14 13:36:20,002 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-14 13:36:20,002 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-14 13:36:20,002 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-14 13:36:20,002 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-14 13:36:20,002 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-14 13:36:20,002 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-14 13:36:20,002 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-14 13:36:20,003 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-14 13:36:20,003 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-14 13:36:20,004 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-14 13:36:20,004 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-14 13:36:20,004 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-14 13:36:20,004 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-14 13:36:20,004 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-14 13:36:20,004 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-14 13:36:20,005 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-14 13:36:20,005 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b1ea7ddff382751fa0e11562333bdb4981cac7bdbf1d356a007804e7e2e5a289 [2021-12-14 13:36:20,164 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-14 13:36:20,181 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-14 13:36:20,183 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-14 13:36:20,184 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-14 13:36:20,184 INFO L275 PluginConnector]: CDTParser initialized [2021-12-14 13:36:20,185 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-properties/list_search-2.i [2021-12-14 13:36:20,233 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7755ef2cc/b9eca01cf2a844fabc702967b645aeb9/FLAGfb69ede66 [2021-12-14 13:36:20,691 INFO L306 CDTParser]: Found 1 translation units. [2021-12-14 13:36:20,692 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-properties/list_search-2.i [2021-12-14 13:36:20,713 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7755ef2cc/b9eca01cf2a844fabc702967b645aeb9/FLAGfb69ede66 [2021-12-14 13:36:20,724 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7755ef2cc/b9eca01cf2a844fabc702967b645aeb9 [2021-12-14 13:36:20,725 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-14 13:36:20,726 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-14 13:36:20,727 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-14 13:36:20,727 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-14 13:36:20,729 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-14 13:36:20,730 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:36:20" (1/1) ... [2021-12-14 13:36:20,730 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@221d3a7b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:36:20, skipping insertion in model container [2021-12-14 13:36:20,730 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:36:20" (1/1) ... [2021-12-14 13:36:20,735 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-14 13:36:20,761 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-14 13:36:20,856 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/list-properties/list_search-2.i[813,826] [2021-12-14 13:36:21,006 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-14 13:36:21,012 INFO L203 MainTranslator]: Completed pre-run [2021-12-14 13:36:21,019 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/list-properties/list_search-2.i[813,826] [2021-12-14 13:36:21,040 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-14 13:36:21,072 INFO L208 MainTranslator]: Completed translation [2021-12-14 13:36:21,072 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:36:21 WrapperNode [2021-12-14 13:36:21,073 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-14 13:36:21,076 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-14 13:36:21,076 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-14 13:36:21,076 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-14 13:36:21,091 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:36:21" (1/1) ... [2021-12-14 13:36:21,112 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:36:21" (1/1) ... [2021-12-14 13:36:21,138 INFO L137 Inliner]: procedures = 226, calls = 29, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 101 [2021-12-14 13:36:21,139 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-14 13:36:21,140 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-14 13:36:21,140 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-14 13:36:21,140 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-14 13:36:21,145 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:36:21" (1/1) ... [2021-12-14 13:36:21,145 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:36:21" (1/1) ... [2021-12-14 13:36:21,147 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:36:21" (1/1) ... [2021-12-14 13:36:21,147 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:36:21" (1/1) ... [2021-12-14 13:36:21,168 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:36:21" (1/1) ... [2021-12-14 13:36:21,176 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:36:21" (1/1) ... [2021-12-14 13:36:21,178 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:36:21" (1/1) ... [2021-12-14 13:36:21,180 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-14 13:36:21,183 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-14 13:36:21,183 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-14 13:36:21,183 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-14 13:36:21,184 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:36:21" (1/1) ... [2021-12-14 13:36:21,191 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-14 13:36:21,212 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:36:21,221 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-14 13:36:21,230 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-14 13:36:21,258 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-14 13:36:21,259 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-14 13:36:21,259 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-14 13:36:21,259 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-14 13:36:21,259 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-14 13:36:21,259 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-14 13:36:21,259 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-14 13:36:21,259 INFO L130 BoogieDeclarations]: Found specification of procedure insert_list [2021-12-14 13:36:21,259 INFO L138 BoogieDeclarations]: Found implementation of procedure insert_list [2021-12-14 13:36:21,260 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-14 13:36:21,260 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-14 13:36:21,260 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-14 13:36:21,352 INFO L236 CfgBuilder]: Building ICFG [2021-12-14 13:36:21,353 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-14 13:36:21,525 INFO L277 CfgBuilder]: Performing block encoding [2021-12-14 13:36:21,529 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-14 13:36:21,530 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-12-14 13:36:21,531 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:36:21 BoogieIcfgContainer [2021-12-14 13:36:21,531 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-14 13:36:21,532 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-14 13:36:21,533 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-14 13:36:21,535 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-14 13:36:21,536 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 01:36:20" (1/3) ... [2021-12-14 13:36:21,536 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c131cd5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:36:21, skipping insertion in model container [2021-12-14 13:36:21,537 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:36:21" (2/3) ... [2021-12-14 13:36:21,537 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c131cd5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:36:21, skipping insertion in model container [2021-12-14 13:36:21,537 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:36:21" (3/3) ... [2021-12-14 13:36:21,538 INFO L111 eAbstractionObserver]: Analyzing ICFG list_search-2.i [2021-12-14 13:36:21,542 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-14 13:36:21,542 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-14 13:36:21,573 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-14 13:36:21,577 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-14 13:36:21,578 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-14 13:36:21,592 INFO L276 IsEmpty]: Start isEmpty. Operand has 36 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 30 states have internal predecessors, (42), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-14 13:36:21,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-14 13:36:21,596 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:36:21,596 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:36:21,596 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:36:21,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:36:21,600 INFO L85 PathProgramCache]: Analyzing trace with hash 1135484681, now seen corresponding path program 1 times [2021-12-14 13:36:21,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:36:21,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651874047] [2021-12-14 13:36:21,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:36:21,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:36:21,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:21,843 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 13:36:21,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:21,913 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 13:36:21,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:21,960 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-14 13:36:21,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:21,970 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-14 13:36:21,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:22,003 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-14 13:36:22,005 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:36:22,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [651874047] [2021-12-14 13:36:22,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [651874047] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:36:22,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [992689489] [2021-12-14 13:36:22,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:36:22,007 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:36:22,007 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:36:22,008 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:36:22,009 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-14 13:36:22,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:22,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 367 conjuncts, 1 conjunts are in the unsatisfiable core [2021-12-14 13:36:22,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:36:22,205 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-12-14 13:36:22,205 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-14 13:36:22,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [992689489] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 13:36:22,206 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-14 13:36:22,206 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [7] total 7 [2021-12-14 13:36:22,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607864991] [2021-12-14 13:36:22,210 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 13:36:22,213 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-14 13:36:22,214 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:36:22,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-14 13:36:22,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-12-14 13:36:22,236 INFO L87 Difference]: Start difference. First operand has 36 states, 29 states have (on average 1.4482758620689655) internal successors, (42), 30 states have internal predecessors, (42), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 2 states, 2 states have (on average 8.5) internal successors, (17), 2 states have internal predecessors, (17), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-14 13:36:22,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:36:22,254 INFO L93 Difference]: Finished difference Result 56 states and 78 transitions. [2021-12-14 13:36:22,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-14 13:36:22,256 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 8.5) internal successors, (17), 2 states have internal predecessors, (17), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 37 [2021-12-14 13:36:22,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:36:22,266 INFO L225 Difference]: With dead ends: 56 [2021-12-14 13:36:22,266 INFO L226 Difference]: Without dead ends: 25 [2021-12-14 13:36:22,269 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-12-14 13:36:22,272 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:36:22,274 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:36:22,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-12-14 13:36:22,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-12-14 13:36:22,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-14 13:36:22,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2021-12-14 13:36:22,300 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 37 [2021-12-14 13:36:22,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:36:22,302 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2021-12-14 13:36:22,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 8.5) internal successors, (17), 2 states have internal predecessors, (17), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-14 13:36:22,303 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2021-12-14 13:36:22,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-14 13:36:22,304 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:36:22,304 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:36:22,321 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-12-14 13:36:22,515 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-12-14 13:36:22,515 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:36:22,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:36:22,516 INFO L85 PathProgramCache]: Analyzing trace with hash 1275349378, now seen corresponding path program 1 times [2021-12-14 13:36:22,516 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:36:22,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1319091361] [2021-12-14 13:36:22,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:36:22,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:36:22,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:22,576 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 13:36:22,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:22,614 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 13:36:22,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:22,640 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-14 13:36:22,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:22,651 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-14 13:36:22,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:22,661 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-14 13:36:22,661 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:36:22,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1319091361] [2021-12-14 13:36:22,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1319091361] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:36:22,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [142181848] [2021-12-14 13:36:22,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:36:22,663 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:36:22,663 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:36:22,664 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:36:22,665 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-14 13:36:22,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:22,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-14 13:36:22,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:36:22,874 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 21 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-14 13:36:22,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:36:23,011 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 22 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-14 13:36:23,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [142181848] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:36:23,011 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:36:23,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 8 [2021-12-14 13:36:23,012 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403211217] [2021-12-14 13:36:23,012 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:36:23,012 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-14 13:36:23,012 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:36:23,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-14 13:36:23,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-12-14 13:36:23,013 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 3 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (6), 2 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-14 13:36:23,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:36:23,123 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2021-12-14 13:36:23,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-14 13:36:23,124 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 3 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (6), 2 states have call predecessors, (6), 3 states have call successors, (6) Word has length 39 [2021-12-14 13:36:23,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:36:23,125 INFO L225 Difference]: With dead ends: 51 [2021-12-14 13:36:23,125 INFO L226 Difference]: Without dead ends: 31 [2021-12-14 13:36:23,126 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 81 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2021-12-14 13:36:23,127 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 42 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:36:23,127 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 86 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:36:23,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-12-14 13:36:23,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2021-12-14 13:36:23,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-14 13:36:23,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-12-14 13:36:23,132 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 39 [2021-12-14 13:36:23,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:36:23,132 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-12-14 13:36:23,133 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 3 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (6), 2 states have call predecessors, (6), 3 states have call successors, (6) [2021-12-14 13:36:23,133 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-12-14 13:36:23,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-14 13:36:23,134 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:36:23,134 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:36:23,153 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-14 13:36:23,351 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,SelfDestructingSolverStorable1 [2021-12-14 13:36:23,351 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:36:23,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:36:23,352 INFO L85 PathProgramCache]: Analyzing trace with hash 177460864, now seen corresponding path program 1 times [2021-12-14 13:36:23,352 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:36:23,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224765313] [2021-12-14 13:36:23,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:36:23,352 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:36:23,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:23,414 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 13:36:23,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:23,420 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 13:36:23,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:23,427 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-14 13:36:23,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:23,441 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-14 13:36:23,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:23,479 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-14 13:36:23,480 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:36:23,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1224765313] [2021-12-14 13:36:23,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1224765313] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 13:36:23,481 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 13:36:23,482 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-14 13:36:23,482 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227336170] [2021-12-14 13:36:23,482 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 13:36:23,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-14 13:36:23,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:36:23,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-14 13:36:23,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-14 13:36:23,484 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 1 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-14 13:36:23,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:36:23,557 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2021-12-14 13:36:23,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-14 13:36:23,558 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 1 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 39 [2021-12-14 13:36:23,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:36:23,559 INFO L225 Difference]: With dead ends: 41 [2021-12-14 13:36:23,559 INFO L226 Difference]: Without dead ends: 32 [2021-12-14 13:36:23,560 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-12-14 13:36:23,561 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 23 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:36:23,561 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 83 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:36:23,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-12-14 13:36:23,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-12-14 13:36:23,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 states have internal predecessors, (28), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-14 13:36:23,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2021-12-14 13:36:23,565 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 39 [2021-12-14 13:36:23,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:36:23,566 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2021-12-14 13:36:23,566 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 1 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-14 13:36:23,566 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2021-12-14 13:36:23,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-14 13:36:23,567 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:36:23,567 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:36:23,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-14 13:36:23,567 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:36:23,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:36:23,571 INFO L85 PathProgramCache]: Analyzing trace with hash 104078038, now seen corresponding path program 1 times [2021-12-14 13:36:23,571 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:36:23,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704421151] [2021-12-14 13:36:23,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:36:23,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:36:23,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:23,648 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 13:36:23,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:23,656 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 13:36:23,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:23,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-14 13:36:23,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:23,667 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-14 13:36:23,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:23,675 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-12-14 13:36:23,675 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:36:23,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1704421151] [2021-12-14 13:36:23,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1704421151] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 13:36:23,676 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 13:36:23,676 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-12-14 13:36:23,676 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915282001] [2021-12-14 13:36:23,676 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 13:36:23,676 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-14 13:36:23,677 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:36:23,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-14 13:36:23,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-12-14 13:36:23,677 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-14 13:36:23,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:36:23,732 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2021-12-14 13:36:23,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-14 13:36:23,732 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 40 [2021-12-14 13:36:23,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:36:23,733 INFO L225 Difference]: With dead ends: 37 [2021-12-14 13:36:23,733 INFO L226 Difference]: Without dead ends: 32 [2021-12-14 13:36:23,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2021-12-14 13:36:23,734 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 15 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:36:23,734 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 123 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:36:23,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-12-14 13:36:23,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-12-14 13:36:23,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 25 states have (on average 1.16) internal successors, (29), 25 states have internal predecessors, (29), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-14 13:36:23,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2021-12-14 13:36:23,738 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 40 [2021-12-14 13:36:23,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:36:23,738 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2021-12-14 13:36:23,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-14 13:36:23,739 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2021-12-14 13:36:23,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-14 13:36:23,739 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:36:23,739 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:36:23,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-14 13:36:23,740 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:36:23,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:36:23,740 INFO L85 PathProgramCache]: Analyzing trace with hash 161336340, now seen corresponding path program 1 times [2021-12-14 13:36:23,740 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:36:23,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442845152] [2021-12-14 13:36:23,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:36:23,741 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:36:23,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:23,798 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 13:36:23,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:23,809 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 13:36:23,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:23,822 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-14 13:36:23,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:23,827 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-14 13:36:23,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:23,852 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-14 13:36:23,852 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:36:23,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442845152] [2021-12-14 13:36:23,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [442845152] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:36:23,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36547784] [2021-12-14 13:36:23,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:36:23,853 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:36:23,853 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:36:23,867 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:36:23,868 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-14 13:36:23,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:23,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-14 13:36:23,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:36:24,053 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-14 13:36:24,053 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-14 13:36:24,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [36547784] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 13:36:24,053 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-14 13:36:24,053 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 10 [2021-12-14 13:36:24,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771305610] [2021-12-14 13:36:24,054 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 13:36:24,054 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-14 13:36:24,054 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:36:24,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-14 13:36:24,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-12-14 13:36:24,055 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-14 13:36:24,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:36:24,104 INFO L93 Difference]: Finished difference Result 45 states and 53 transitions. [2021-12-14 13:36:24,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-14 13:36:24,109 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 40 [2021-12-14 13:36:24,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:36:24,110 INFO L225 Difference]: With dead ends: 45 [2021-12-14 13:36:24,110 INFO L226 Difference]: Without dead ends: 36 [2021-12-14 13:36:24,110 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-12-14 13:36:24,111 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 23 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 13:36:24,111 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 93 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 13:36:24,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-12-14 13:36:24,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2021-12-14 13:36:24,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 27 states have internal predecessors, (31), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-14 13:36:24,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-12-14 13:36:24,114 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 40 [2021-12-14 13:36:24,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:36:24,115 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-12-14 13:36:24,115 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-14 13:36:24,115 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-12-14 13:36:24,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-14 13:36:24,115 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:36:24,115 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:36:24,134 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-14 13:36:24,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:36:24,324 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:36:24,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:36:24,324 INFO L85 PathProgramCache]: Analyzing trace with hash -1968420967, now seen corresponding path program 1 times [2021-12-14 13:36:24,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:36:24,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641902134] [2021-12-14 13:36:24,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:36:24,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:36:24,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:24,387 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 13:36:24,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:24,392 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 13:36:24,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:24,397 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-14 13:36:24,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:24,412 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-14 13:36:24,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:24,460 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 20 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-14 13:36:24,460 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:36:24,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641902134] [2021-12-14 13:36:24,461 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1641902134] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:36:24,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [354515866] [2021-12-14 13:36:24,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:36:24,461 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:36:24,461 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:36:24,476 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:36:24,477 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-14 13:36:24,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:24,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-14 13:36:24,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:36:24,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-14 13:36:24,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2021-12-14 13:36:24,752 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 19 proven. 5 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-14 13:36:24,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:36:24,931 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 19 proven. 5 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-14 13:36:24,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [354515866] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:36:24,931 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:36:24,931 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 10] total 22 [2021-12-14 13:36:24,931 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041438793] [2021-12-14 13:36:24,931 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:36:24,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-14 13:36:24,932 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:36:24,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-14 13:36:24,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2021-12-14 13:36:24,932 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 18 states have internal predecessors, (48), 3 states have call successors, (9), 4 states have call predecessors, (9), 6 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) [2021-12-14 13:36:25,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:36:25,336 INFO L93 Difference]: Finished difference Result 52 states and 61 transitions. [2021-12-14 13:36:25,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-14 13:36:25,336 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 18 states have internal predecessors, (48), 3 states have call successors, (9), 4 states have call predecessors, (9), 6 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) Word has length 43 [2021-12-14 13:36:25,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:36:25,337 INFO L225 Difference]: With dead ends: 52 [2021-12-14 13:36:25,337 INFO L226 Difference]: Without dead ends: 40 [2021-12-14 13:36:25,337 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=257, Invalid=1075, Unknown=0, NotChecked=0, Total=1332 [2021-12-14 13:36:25,338 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 65 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-14 13:36:25,338 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 231 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-14 13:36:25,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-12-14 13:36:25,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 35. [2021-12-14 13:36:25,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-14 13:36:25,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2021-12-14 13:36:25,342 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 43 [2021-12-14 13:36:25,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:36:25,342 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2021-12-14 13:36:25,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 18 states have internal predecessors, (48), 3 states have call successors, (9), 4 states have call predecessors, (9), 6 states have return successors, (7), 5 states have call predecessors, (7), 3 states have call successors, (7) [2021-12-14 13:36:25,342 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2021-12-14 13:36:25,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-12-14 13:36:25,342 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:36:25,342 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:36:25,359 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-12-14 13:36:25,555 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:36:25,556 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:36:25,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:36:25,556 INFO L85 PathProgramCache]: Analyzing trace with hash 2034659567, now seen corresponding path program 2 times [2021-12-14 13:36:25,556 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:36:25,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [873221803] [2021-12-14 13:36:25,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:36:25,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:36:25,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:25,643 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 13:36:25,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:25,649 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 13:36:25,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:25,655 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-14 13:36:25,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:25,678 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-14 13:36:25,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:25,758 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-14 13:36:25,758 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:36:25,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [873221803] [2021-12-14 13:36:25,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [873221803] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:36:25,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1755625516] [2021-12-14 13:36:25,758 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 13:36:25,759 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:36:25,759 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:36:25,760 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:36:25,761 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-14 13:36:25,881 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 13:36:25,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:36:25,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 23 conjunts are in the unsatisfiable core [2021-12-14 13:36:25,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:36:25,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-14 13:36:25,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-14 13:36:26,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 19 [2021-12-14 13:36:26,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2021-12-14 13:36:26,044 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-12-14 13:36:26,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:36:26,175 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-12-14 13:36:26,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1755625516] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 13:36:26,175 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 13:36:26,176 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8, 8] total 19 [2021-12-14 13:36:26,176 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746566228] [2021-12-14 13:36:26,176 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 13:36:26,176 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-14 13:36:26,176 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:36:26,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-14 13:36:26,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=293, Unknown=0, NotChecked=0, Total=342 [2021-12-14 13:36:26,177 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 19 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 2 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-12-14 13:36:26,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:36:26,509 INFO L93 Difference]: Finished difference Result 53 states and 62 transitions. [2021-12-14 13:36:26,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-14 13:36:26,509 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 2 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 44 [2021-12-14 13:36:26,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:36:26,510 INFO L225 Difference]: With dead ends: 53 [2021-12-14 13:36:26,510 INFO L226 Difference]: Without dead ends: 44 [2021-12-14 13:36:26,511 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=163, Invalid=767, Unknown=0, NotChecked=0, Total=930 [2021-12-14 13:36:26,511 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 73 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-14 13:36:26,511 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 151 Invalid, 307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-14 13:36:26,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-12-14 13:36:26,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 38. [2021-12-14 13:36:26,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 31 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-14 13:36:26,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2021-12-14 13:36:26,515 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 44 [2021-12-14 13:36:26,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:36:26,515 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2021-12-14 13:36:26,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 2 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-12-14 13:36:26,516 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2021-12-14 13:36:26,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-14 13:36:26,516 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:36:26,516 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:36:26,536 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-12-14 13:36:26,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:36:26,717 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:36:26,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:36:26,717 INFO L85 PathProgramCache]: Analyzing trace with hash 1693757662, now seen corresponding path program 3 times [2021-12-14 13:36:26,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:36:26,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413883332] [2021-12-14 13:36:26,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:36:26,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:36:26,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:26,833 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 13:36:26,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:26,841 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 13:36:26,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:26,871 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-14 13:36:26,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:26,936 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-14 13:36:26,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:27,022 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 22 proven. 11 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-14 13:36:27,023 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:36:27,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413883332] [2021-12-14 13:36:27,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1413883332] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:36:27,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [48533150] [2021-12-14 13:36:27,023 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 13:36:27,023 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:36:27,023 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:36:27,024 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:36:27,025 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-14 13:36:27,167 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-14 13:36:27,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:36:27,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 76 conjunts are in the unsatisfiable core [2021-12-14 13:36:27,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:36:27,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-14 13:36:27,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-14 13:36:27,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-14 13:36:27,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 14 [2021-12-14 13:36:27,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 14 [2021-12-14 13:36:27,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 13:36:27,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 46 [2021-12-14 13:36:27,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 13:36:27,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 50 [2021-12-14 13:36:27,559 INFO L354 Elim1Store]: treesize reduction 4, result has 71.4 percent of original size [2021-12-14 13:36:27,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 17 [2021-12-14 13:36:27,746 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-14 13:36:27,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:36:27,937 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-14 13:36:27,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 20 [2021-12-14 13:36:27,942 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-14 13:36:27,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 20 [2021-12-14 13:36:27,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [48533150] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:36:27,995 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-14 13:36:27,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13] total 28 [2021-12-14 13:36:27,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833361311] [2021-12-14 13:36:27,995 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-14 13:36:27,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-12-14 13:36:27,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:36:27,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-12-14 13:36:27,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=951, Unknown=5, NotChecked=0, Total=1056 [2021-12-14 13:36:27,996 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 25 states have internal predecessors, (59), 4 states have call successors, (8), 3 states have call predecessors, (8), 6 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-14 13:36:28,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:36:28,696 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2021-12-14 13:36:28,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-14 13:36:28,697 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 25 states have internal predecessors, (59), 4 states have call successors, (8), 3 states have call predecessors, (8), 6 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) Word has length 47 [2021-12-14 13:36:28,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:36:28,698 INFO L225 Difference]: With dead ends: 61 [2021-12-14 13:36:28,698 INFO L226 Difference]: Without dead ends: 46 [2021-12-14 13:36:28,699 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 504 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=263, Invalid=2177, Unknown=10, NotChecked=0, Total=2450 [2021-12-14 13:36:28,699 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 67 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 347 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 347 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 49 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-14 13:36:28,699 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 224 Invalid, 438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 347 Invalid, 0 Unknown, 49 Unchecked, 0.2s Time] [2021-12-14 13:36:28,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-12-14 13:36:28,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2021-12-14 13:36:28,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 35 states have internal predecessors, (39), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-14 13:36:28,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2021-12-14 13:36:28,703 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 47 [2021-12-14 13:36:28,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:36:28,703 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2021-12-14 13:36:28,703 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 25 states have internal predecessors, (59), 4 states have call successors, (8), 3 states have call predecessors, (8), 6 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2021-12-14 13:36:28,703 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2021-12-14 13:36:28,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-14 13:36:28,703 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:36:28,704 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:36:28,725 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-12-14 13:36:28,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:36:28,915 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:36:28,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:36:28,916 INFO L85 PathProgramCache]: Analyzing trace with hash 361857145, now seen corresponding path program 4 times [2021-12-14 13:36:28,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:36:28,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892786642] [2021-12-14 13:36:28,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:36:28,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:36:28,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:29,122 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 13:36:29,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:29,155 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 13:36:29,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:29,249 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-14 13:36:29,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:29,360 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-14 13:36:29,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:29,496 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 16 proven. 31 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-14 13:36:29,496 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:36:29,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892786642] [2021-12-14 13:36:29,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [892786642] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:36:29,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34516723] [2021-12-14 13:36:29,496 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-14 13:36:29,497 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:36:29,497 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:36:29,497 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:36:29,498 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-14 13:36:29,658 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-14 13:36:29,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:36:29,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 100 conjunts are in the unsatisfiable core [2021-12-14 13:36:29,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:36:29,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-14 13:36:29,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-14 13:36:29,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 14 [2021-12-14 13:36:29,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-14 13:36:30,017 INFO L354 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-12-14 13:36:30,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 29 [2021-12-14 13:36:30,026 INFO L354 Elim1Store]: treesize reduction 33, result has 25.0 percent of original size [2021-12-14 13:36:30,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 20 [2021-12-14 13:36:30,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 14 [2021-12-14 13:36:30,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 14 [2021-12-14 13:36:30,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 13:36:30,256 INFO L354 Elim1Store]: treesize reduction 31, result has 13.9 percent of original size [2021-12-14 13:36:30,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 80 treesize of output 65 [2021-12-14 13:36:30,266 INFO L354 Elim1Store]: treesize reduction 49, result has 29.0 percent of original size [2021-12-14 13:36:30,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 30 [2021-12-14 13:36:30,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-14 13:36:30,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 23 [2021-12-14 13:36:30,725 INFO L354 Elim1Store]: treesize reduction 15, result has 6.3 percent of original size [2021-12-14 13:36:30,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 99 treesize of output 60 [2021-12-14 13:36:30,804 INFO L354 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2021-12-14 13:36:30,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 52 treesize of output 34 [2021-12-14 13:36:30,822 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 13 proven. 35 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-14 13:36:30,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:36:31,143 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-14 13:36:31,143 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 41 [2021-12-14 13:36:31,147 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-14 13:36:31,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 38 [2021-12-14 13:36:31,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [34516723] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:36:31,212 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-14 13:36:31,212 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 26] total 43 [2021-12-14 13:36:31,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1649487139] [2021-12-14 13:36:31,212 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-14 13:36:31,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-12-14 13:36:31,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 13:36:31,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-12-14 13:36:31,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=2185, Unknown=0, NotChecked=0, Total=2352 [2021-12-14 13:36:31,213 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand has 43 states, 43 states have (on average 1.697674418604651) internal successors, (73), 39 states have internal predecessors, (73), 6 states have call successors, (8), 5 states have call predecessors, (8), 8 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-14 13:36:32,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 13:36:32,761 INFO L93 Difference]: Finished difference Result 65 states and 71 transitions. [2021-12-14 13:36:32,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-12-14 13:36:32,762 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.697674418604651) internal successors, (73), 39 states have internal predecessors, (73), 6 states have call successors, (8), 5 states have call predecessors, (8), 8 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) Word has length 51 [2021-12-14 13:36:32,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 13:36:32,762 INFO L225 Difference]: With dead ends: 65 [2021-12-14 13:36:32,762 INFO L226 Difference]: Without dead ends: 56 [2021-12-14 13:36:32,763 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 53 SyntacticMatches, 6 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1520 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=503, Invalid=5047, Unknown=0, NotChecked=0, Total=5550 [2021-12-14 13:36:32,764 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 31 mSDsluCounter, 396 mSDsCounter, 0 mSdLazyCounter, 544 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 416 SdHoareTripleChecker+Invalid, 689 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 544 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 97 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-14 13:36:32,764 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 416 Invalid, 689 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 544 Invalid, 0 Unknown, 97 Unchecked, 0.3s Time] [2021-12-14 13:36:32,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-12-14 13:36:32,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-12-14 13:36:32,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 46 states have internal predecessors, (50), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-12-14 13:36:32,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2021-12-14 13:36:32,769 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 51 [2021-12-14 13:36:32,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 13:36:32,769 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2021-12-14 13:36:32,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.697674418604651) internal successors, (73), 39 states have internal predecessors, (73), 6 states have call successors, (8), 5 states have call predecessors, (8), 8 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-14 13:36:32,770 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2021-12-14 13:36:32,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-12-14 13:36:32,770 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 13:36:32,770 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 13:36:32,789 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-12-14 13:36:32,989 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:36:32,989 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 13:36:32,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 13:36:32,990 INFO L85 PathProgramCache]: Analyzing trace with hash 1742339348, now seen corresponding path program 5 times [2021-12-14 13:36:32,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 13:36:32,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916397223] [2021-12-14 13:36:32,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 13:36:32,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 13:36:33,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:33,114 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 13:36:33,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:33,137 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2021-12-14 13:36:33,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:33,195 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-12-14 13:36:33,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:33,296 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-14 13:36:33,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 13:36:33,406 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 13 proven. 17 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-12-14 13:36:33,407 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 13:36:33,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916397223] [2021-12-14 13:36:33,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [916397223] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 13:36:33,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900195335] [2021-12-14 13:36:33,407 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-14 13:36:33,407 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 13:36:33,407 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 13:36:33,408 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 13:36:33,409 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-14 13:36:33,582 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-12-14 13:36:33,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 13:36:33,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 42 conjunts are in the unsatisfiable core [2021-12-14 13:36:33,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 13:36:36,968 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-14 13:36:36,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 6 new quantified variables, introduced 3 case distinctions, treesize of input 149 treesize of output 114 [2021-12-14 13:36:36,982 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-14 13:36:36,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 111 treesize of output 97 [2021-12-14 13:36:37,090 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-12-14 13:36:37,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 13:36:37,574 INFO L354 Elim1Store]: treesize reduction 36, result has 86.5 percent of original size [2021-12-14 13:36:37,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 12 new quantified variables, introduced 15 case distinctions, treesize of input 184 treesize of output 333 [2021-12-14 13:36:37,727 INFO L354 Elim1Store]: treesize reduction 37, result has 80.1 percent of original size [2021-12-14 13:36:37,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 10 new quantified variables, introduced 15 case distinctions, treesize of input 410 treesize of output 366