./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/id_i25_o25-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive-simple/id_i25_o25-1.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 2409cd2f018515417b0b6bf5d396e4bc80c02540769112137ebf388167bdf776 --- Real Ultimate output --- This is Ultimate 0.2.2-839c364b5d67a0f615c82cb70ab247790648d4a9-839c364 [2021-12-14 14:49:58,225 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-14 14:49:58,226 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-14 14:49:58,254 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-14 14:49:58,255 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-14 14:49:58,258 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-14 14:49:58,260 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-14 14:49:58,265 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-14 14:49:58,267 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-14 14:49:58,271 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-14 14:49:58,272 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-14 14:49:58,273 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-14 14:49:58,273 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-14 14:49:58,275 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-14 14:49:58,276 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-14 14:49:58,280 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-14 14:49:58,281 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-14 14:49:58,281 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-14 14:49:58,282 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-14 14:49:58,283 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-14 14:49:58,286 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-14 14:49:58,287 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-14 14:49:58,288 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-14 14:49:58,289 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-14 14:49:58,290 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-14 14:49:58,293 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-14 14:49:58,294 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-14 14:49:58,294 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-14 14:49:58,295 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-14 14:49:58,296 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-14 14:49:58,296 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-14 14:49:58,297 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-14 14:49:58,298 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-14 14:49:58,298 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-14 14:49:58,299 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-14 14:49:58,300 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-14 14:49:58,300 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-14 14:49:58,301 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-14 14:49:58,301 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-14 14:49:58,301 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-14 14:49:58,302 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-14 14:49:58,302 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-14 14:49:58,322 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-14 14:49:58,323 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-14 14:49:58,324 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-14 14:49:58,324 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-14 14:49:58,325 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-14 14:49:58,325 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-14 14:49:58,325 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-14 14:49:58,325 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-14 14:49:58,325 INFO L138 SettingsManager]: * Use SBE=true [2021-12-14 14:49:58,326 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-14 14:49:58,326 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-14 14:49:58,327 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-14 14:49:58,327 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-14 14:49:58,327 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-14 14:49:58,327 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-14 14:49:58,327 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-14 14:49:58,327 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-14 14:49:58,327 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-14 14:49:58,328 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-14 14:49:58,328 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-14 14:49:58,328 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-14 14:49:58,328 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-14 14:49:58,328 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-14 14:49:58,328 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-14 14:49:58,329 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-14 14:49:58,329 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-14 14:49:58,329 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-14 14:49:58,330 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-14 14:49:58,330 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-14 14:49:58,330 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-14 14:49:58,330 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-14 14:49:58,330 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-14 14:49:58,331 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-14 14:49:58,331 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-14 14:49:58,331 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2409cd2f018515417b0b6bf5d396e4bc80c02540769112137ebf388167bdf776 [2021-12-14 14:49:58,506 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-14 14:49:58,533 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-14 14:49:58,535 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-14 14:49:58,536 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-14 14:49:58,537 INFO L275 PluginConnector]: CDTParser initialized [2021-12-14 14:49:58,537 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id_i25_o25-1.c [2021-12-14 14:49:58,600 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7446be5f6/bac72f259a3448e28991b83df0e8965b/FLAG60b129747 [2021-12-14 14:49:58,897 INFO L306 CDTParser]: Found 1 translation units. [2021-12-14 14:49:58,897 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_i25_o25-1.c [2021-12-14 14:49:58,902 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7446be5f6/bac72f259a3448e28991b83df0e8965b/FLAG60b129747 [2021-12-14 14:49:59,337 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7446be5f6/bac72f259a3448e28991b83df0e8965b [2021-12-14 14:49:59,353 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-14 14:49:59,354 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-14 14:49:59,355 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-14 14:49:59,355 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-14 14:49:59,357 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-14 14:49:59,358 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 02:49:59" (1/1) ... [2021-12-14 14:49:59,360 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6bd8b3b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:59, skipping insertion in model container [2021-12-14 14:49:59,360 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 02:49:59" (1/1) ... [2021-12-14 14:49:59,364 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-14 14:49:59,373 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-14 14:49:59,497 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/recursive-simple/id_i25_o25-1.c[454,467] [2021-12-14 14:49:59,501 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-14 14:49:59,506 INFO L203 MainTranslator]: Completed pre-run [2021-12-14 14:49:59,518 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/recursive-simple/id_i25_o25-1.c[454,467] [2021-12-14 14:49:59,519 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-14 14:49:59,528 INFO L208 MainTranslator]: Completed translation [2021-12-14 14:49:59,529 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:59 WrapperNode [2021-12-14 14:49:59,529 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-14 14:49:59,531 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-14 14:49:59,531 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-14 14:49:59,531 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-14 14:49:59,536 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:59" (1/1) ... [2021-12-14 14:49:59,542 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:59" (1/1) ... [2021-12-14 14:49:59,551 INFO L137 Inliner]: procedures = 13, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 19 [2021-12-14 14:49:59,551 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-14 14:49:59,552 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-14 14:49:59,552 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-14 14:49:59,552 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-14 14:49:59,557 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:59" (1/1) ... [2021-12-14 14:49:59,558 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:59" (1/1) ... [2021-12-14 14:49:59,559 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:59" (1/1) ... [2021-12-14 14:49:59,559 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:59" (1/1) ... [2021-12-14 14:49:59,560 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:59" (1/1) ... [2021-12-14 14:49:59,561 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:59" (1/1) ... [2021-12-14 14:49:59,562 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:59" (1/1) ... [2021-12-14 14:49:59,562 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-14 14:49:59,563 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-14 14:49:59,563 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-14 14:49:59,564 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-14 14:49:59,565 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:59" (1/1) ... [2021-12-14 14:49:59,571 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-14 14:49:59,583 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:49:59,637 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 14:49:59,638 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 14:49:59,664 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-14 14:49:59,664 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-14 14:49:59,664 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-14 14:49:59,664 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-14 14:49:59,665 INFO L130 BoogieDeclarations]: Found specification of procedure id [2021-12-14 14:49:59,665 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2021-12-14 14:49:59,706 INFO L236 CfgBuilder]: Building ICFG [2021-12-14 14:49:59,707 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-14 14:49:59,803 INFO L277 CfgBuilder]: Performing block encoding [2021-12-14 14:49:59,807 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-14 14:49:59,810 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-12-14 14:49:59,812 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 02:49:59 BoogieIcfgContainer [2021-12-14 14:49:59,812 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-14 14:49:59,813 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-14 14:49:59,814 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-14 14:49:59,816 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-14 14:49:59,817 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 02:49:59" (1/3) ... [2021-12-14 14:49:59,817 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d7eff30 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 02:49:59, skipping insertion in model container [2021-12-14 14:49:59,817 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 02:49:59" (2/3) ... [2021-12-14 14:49:59,818 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d7eff30 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 02:49:59, skipping insertion in model container [2021-12-14 14:49:59,818 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 02:49:59" (3/3) ... [2021-12-14 14:49:59,819 INFO L111 eAbstractionObserver]: Analyzing ICFG id_i25_o25-1.c [2021-12-14 14:49:59,823 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-14 14:49:59,824 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-14 14:49:59,863 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-14 14:49:59,870 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 14:49:59,870 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-14 14:49:59,884 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-14 14:49:59,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-12-14 14:49:59,890 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:49:59,891 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:49:59,891 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:49:59,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:49:59,895 INFO L85 PathProgramCache]: Analyzing trace with hash -358017204, now seen corresponding path program 1 times [2021-12-14 14:49:59,901 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:49:59,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045097260] [2021-12-14 14:49:59,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:49:59,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:49:59,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:00,039 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:00,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:00,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-14 14:50:00,084 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:00,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045097260] [2021-12-14 14:50:00,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2045097260] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-14 14:50:00,085 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-14 14:50:00,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-14 14:50:00,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671324393] [2021-12-14 14:50:00,087 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-14 14:50:00,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-14 14:50:00,100 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 14:50:00,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-14 14:50:00,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-14 14:50:00,132 INFO L87 Difference]: Start difference. First operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-14 14:50:00,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 14:50:00,177 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2021-12-14 14:50:00,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-14 14:50:00,180 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-12-14 14:50:00,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 14:50:00,191 INFO L225 Difference]: With dead ends: 25 [2021-12-14 14:50:00,192 INFO L226 Difference]: Without dead ends: 15 [2021-12-14 14:50:00,194 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-14 14:50:00,197 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 11 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 14:50:00,198 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 36 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 14:50:00,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-12-14 14:50:00,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-12-14 14:50:00,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 11 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-12-14 14:50:00,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-12-14 14:50:00,225 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2021-12-14 14:50:00,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 14:50:00,226 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-12-14 14:50:00,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-14 14:50:00,226 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-12-14 14:50:00,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-12-14 14:50:00,227 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:50:00,227 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:50:00,227 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-14 14:50:00,228 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:50:00,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:50:00,228 INFO L85 PathProgramCache]: Analyzing trace with hash 679465686, now seen corresponding path program 1 times [2021-12-14 14:50:00,229 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:50:00,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791478438] [2021-12-14 14:50:00,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:00,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:50:00,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:00,256 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:00,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:00,282 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:00,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:00,308 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-14 14:50:00,309 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:00,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791478438] [2021-12-14 14:50:00,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [791478438] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 14:50:00,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1407766195] [2021-12-14 14:50:00,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:00,309 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:00,310 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:50:00,325 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 14:50:00,334 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 14:50:00,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:00,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2021-12-14 14:50:00,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 14:50:00,482 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-14 14:50:00,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 14:50:00,643 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-14 14:50:00,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1407766195] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 14:50:00,644 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 14:50:00,644 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 11 [2021-12-14 14:50:00,645 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498741979] [2021-12-14 14:50:00,645 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 14:50:00,645 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-14 14:50:00,646 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 14:50:00,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-14 14:50:00,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2021-12-14 14:50:00,646 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 11 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 11 states have internal predecessors, (20), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-14 14:50:00,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 14:50:00,693 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2021-12-14 14:50:00,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-14 14:50:00,694 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 11 states have internal predecessors, (20), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 5 states have call successors, (5) Word has length 16 [2021-12-14 14:50:00,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 14:50:00,695 INFO L225 Difference]: With dead ends: 22 [2021-12-14 14:50:00,696 INFO L226 Difference]: Without dead ends: 18 [2021-12-14 14:50:00,697 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2021-12-14 14:50:00,699 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 22 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 14:50:00,700 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 36 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 14:50:00,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-12-14 14:50:00,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-12-14 14:50:00,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 13 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-14 14:50:00,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-12-14 14:50:00,724 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2021-12-14 14:50:00,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 14:50:00,725 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-12-14 14:50:00,725 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 11 states have internal predecessors, (20), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-14 14:50:00,725 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-12-14 14:50:00,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-12-14 14:50:00,725 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:50:00,725 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:50:00,749 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-14 14:50:00,926 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:00,926 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:50:00,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:50:00,927 INFO L85 PathProgramCache]: Analyzing trace with hash -41010676, now seen corresponding path program 2 times [2021-12-14 14:50:00,927 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:50:00,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812069200] [2021-12-14 14:50:00,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:00,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:50:00,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:00,951 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:00,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:00,982 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:00,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:01,011 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:01,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:01,034 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-14 14:50:01,034 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:01,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812069200] [2021-12-14 14:50:01,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812069200] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 14:50:01,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1184687406] [2021-12-14 14:50:01,035 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 14:50:01,035 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:01,035 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:50:01,056 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 14:50:01,072 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 14:50:01,089 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 14:50:01,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 14:50:01,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 8 conjunts are in the unsatisfiable core [2021-12-14 14:50:01,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 14:50:01,172 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-14 14:50:01,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 14:50:01,427 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-14 14:50:01,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1184687406] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 14:50:01,427 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 14:50:01,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 13 [2021-12-14 14:50:01,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207756837] [2021-12-14 14:50:01,428 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 14:50:01,429 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-14 14:50:01,429 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 14:50:01,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-14 14:50:01,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2021-12-14 14:50:01,431 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 13 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 13 states have internal predecessors, (24), 6 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (8), 3 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-14 14:50:01,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 14:50:01,475 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2021-12-14 14:50:01,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-14 14:50:01,476 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 13 states have internal predecessors, (24), 6 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (8), 3 states have call predecessors, (8), 6 states have call successors, (8) Word has length 22 [2021-12-14 14:50:01,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 14:50:01,476 INFO L225 Difference]: With dead ends: 25 [2021-12-14 14:50:01,477 INFO L226 Difference]: Without dead ends: 21 [2021-12-14 14:50:01,477 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=163, Unknown=0, NotChecked=0, Total=240 [2021-12-14 14:50:01,478 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 12 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 14:50:01,478 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 48 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 14:50:01,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-12-14 14:50:01,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-12-14 14:50:01,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 15 states have internal predecessors, (15), 2 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-14 14:50:01,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-12-14 14:50:01,482 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 22 [2021-12-14 14:50:01,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 14:50:01,482 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-12-14 14:50:01,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 13 states have internal predecessors, (24), 6 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (8), 3 states have call predecessors, (8), 6 states have call successors, (8) [2021-12-14 14:50:01,483 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-12-14 14:50:01,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-12-14 14:50:01,483 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:50:01,483 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:50:01,499 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-12-14 14:50:01,691 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-12-14 14:50:01,692 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:50:01,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:50:01,692 INFO L85 PathProgramCache]: Analyzing trace with hash 1769866774, now seen corresponding path program 3 times [2021-12-14 14:50:01,692 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:50:01,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1418509984] [2021-12-14 14:50:01,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:01,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:50:01,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:01,726 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:01,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:01,744 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:01,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:01,760 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:01,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:01,773 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:01,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:01,783 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-14 14:50:01,784 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:01,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1418509984] [2021-12-14 14:50:01,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1418509984] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 14:50:01,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189103748] [2021-12-14 14:50:01,784 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 14:50:01,784 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:01,785 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:50:01,786 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 14:50:01,787 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 14:50:01,816 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-12-14 14:50:01,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 14:50:01,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-14 14:50:01,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 14:50:01,883 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-14 14:50:01,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 14:50:02,224 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-14 14:50:02,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [189103748] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 14:50:02,224 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 14:50:02,224 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 15 [2021-12-14 14:50:02,225 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792759182] [2021-12-14 14:50:02,225 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 14:50:02,225 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-14 14:50:02,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 14:50:02,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-14 14:50:02,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2021-12-14 14:50:02,226 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 15 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 15 states have internal predecessors, (28), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (11), 4 states have call predecessors, (11), 7 states have call successors, (11) [2021-12-14 14:50:02,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 14:50:02,287 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2021-12-14 14:50:02,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-14 14:50:02,287 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 15 states have internal predecessors, (28), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (11), 4 states have call predecessors, (11), 7 states have call successors, (11) Word has length 28 [2021-12-14 14:50:02,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 14:50:02,289 INFO L225 Difference]: With dead ends: 28 [2021-12-14 14:50:02,289 INFO L226 Difference]: Without dead ends: 24 [2021-12-14 14:50:02,290 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=110, Invalid=232, Unknown=0, NotChecked=0, Total=342 [2021-12-14 14:50:02,292 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 27 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 14:50:02,293 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 48 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 14:50:02,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-12-14 14:50:02,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-12-14 14:50:02,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.0625) internal successors, (17), 17 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 5 states have return successors, (6), 5 states have call predecessors, (6), 2 states have call successors, (6) [2021-12-14 14:50:02,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-12-14 14:50:02,301 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 28 [2021-12-14 14:50:02,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 14:50:02,301 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-12-14 14:50:02,301 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 15 states have internal predecessors, (28), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (11), 4 states have call predecessors, (11), 7 states have call successors, (11) [2021-12-14 14:50:02,302 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-12-14 14:50:02,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-12-14 14:50:02,303 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:50:02,303 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:50:02,327 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 14:50:02,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:02,519 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:50:02,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:50:02,520 INFO L85 PathProgramCache]: Analyzing trace with hash 371264716, now seen corresponding path program 4 times [2021-12-14 14:50:02,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:50:02,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951359047] [2021-12-14 14:50:02,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:02,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:50:02,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:02,554 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:02,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:02,575 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:02,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:02,594 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:02,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:02,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:02,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:02,628 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:02,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:02,638 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-12-14 14:50:02,638 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:02,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [951359047] [2021-12-14 14:50:02,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [951359047] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 14:50:02,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1194724573] [2021-12-14 14:50:02,638 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-14 14:50:02,639 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:02,639 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:50:02,639 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 14:50:02,640 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 14:50:02,669 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-14 14:50:02,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 14:50:02,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-14 14:50:02,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 14:50:02,765 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-12-14 14:50:02,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 14:50:03,300 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-14 14:50:03,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1194724573] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 14:50:03,301 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 14:50:03,301 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 17 [2021-12-14 14:50:03,301 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470016178] [2021-12-14 14:50:03,301 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 14:50:03,302 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-12-14 14:50:03,302 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 14:50:03,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-12-14 14:50:03,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=194, Unknown=0, NotChecked=0, Total=272 [2021-12-14 14:50:03,302 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 17 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 17 states have internal predecessors, (32), 8 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (14), 5 states have call predecessors, (14), 8 states have call successors, (14) [2021-12-14 14:50:03,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 14:50:03,373 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2021-12-14 14:50:03,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-14 14:50:03,373 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 17 states have internal predecessors, (32), 8 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (14), 5 states have call predecessors, (14), 8 states have call successors, (14) Word has length 34 [2021-12-14 14:50:03,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 14:50:03,374 INFO L225 Difference]: With dead ends: 31 [2021-12-14 14:50:03,374 INFO L226 Difference]: Without dead ends: 27 [2021-12-14 14:50:03,374 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=149, Invalid=313, Unknown=0, NotChecked=0, Total=462 [2021-12-14 14:50:03,375 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 39 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 14:50:03,375 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 65 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 14:50:03,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-12-14 14:50:03,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-12-14 14:50:03,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 19 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 6 states have return successors, (7), 6 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-14 14:50:03,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-12-14 14:50:03,378 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 34 [2021-12-14 14:50:03,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 14:50:03,379 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-12-14 14:50:03,379 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 17 states have internal predecessors, (32), 8 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (14), 5 states have call predecessors, (14), 8 states have call successors, (14) [2021-12-14 14:50:03,379 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-12-14 14:50:03,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-14 14:50:03,380 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:50:03,380 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:50:03,396 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-12-14 14:50:03,589 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:03,590 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:50:03,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:50:03,590 INFO L85 PathProgramCache]: Analyzing trace with hash -886339242, now seen corresponding path program 5 times [2021-12-14 14:50:03,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:50:03,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038385845] [2021-12-14 14:50:03,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:03,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:50:03,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:03,617 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:03,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:03,652 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:03,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:03,666 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:03,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:03,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:03,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:03,712 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:03,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:03,724 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:03,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:03,739 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-12-14 14:50:03,739 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:03,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038385845] [2021-12-14 14:50:03,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1038385845] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 14:50:03,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [381014562] [2021-12-14 14:50:03,739 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-14 14:50:03,739 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:03,740 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:50:03,740 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 14:50:03,741 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 14:50:03,778 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-12-14 14:50:03,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 14:50:03,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-14 14:50:03,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 14:50:03,860 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-12-14 14:50:03,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 14:50:04,650 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-14 14:50:04,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [381014562] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 14:50:04,650 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 14:50:04,650 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 19 [2021-12-14 14:50:04,650 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462679575] [2021-12-14 14:50:04,650 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 14:50:04,651 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-14 14:50:04,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 14:50:04,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-14 14:50:04,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=245, Unknown=0, NotChecked=0, Total=342 [2021-12-14 14:50:04,652 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 19 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 19 states have internal predecessors, (36), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (17), 6 states have call predecessors, (17), 9 states have call successors, (17) [2021-12-14 14:50:04,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 14:50:04,719 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2021-12-14 14:50:04,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-14 14:50:04,719 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 19 states have internal predecessors, (36), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (17), 6 states have call predecessors, (17), 9 states have call successors, (17) Word has length 40 [2021-12-14 14:50:04,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 14:50:04,720 INFO L225 Difference]: With dead ends: 34 [2021-12-14 14:50:04,720 INFO L226 Difference]: Without dead ends: 30 [2021-12-14 14:50:04,720 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=194, Invalid=406, Unknown=0, NotChecked=0, Total=600 [2021-12-14 14:50:04,721 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 32 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 14:50:04,721 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 74 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 14:50:04,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-12-14 14:50:04,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-12-14 14:50:04,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.05) internal successors, (21), 21 states have internal predecessors, (21), 2 states have call successors, (2), 1 states have call predecessors, (2), 7 states have return successors, (8), 7 states have call predecessors, (8), 2 states have call successors, (8) [2021-12-14 14:50:04,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-12-14 14:50:04,725 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 40 [2021-12-14 14:50:04,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 14:50:04,725 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-12-14 14:50:04,725 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 19 states have internal predecessors, (36), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (17), 6 states have call predecessors, (17), 9 states have call successors, (17) [2021-12-14 14:50:04,725 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-12-14 14:50:04,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-12-14 14:50:04,726 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:50:04,726 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:50:04,743 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 14:50:04,939 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:04,940 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:50:04,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:50:04,940 INFO L85 PathProgramCache]: Analyzing trace with hash -918712436, now seen corresponding path program 6 times [2021-12-14 14:50:04,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:50:04,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730883496] [2021-12-14 14:50:04,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:04,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:50:04,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:04,977 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:04,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:04,992 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:04,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:05,006 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:05,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:05,029 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:05,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:05,053 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:05,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:05,064 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:05,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:05,075 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:05,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:05,089 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-12-14 14:50:05,089 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:05,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730883496] [2021-12-14 14:50:05,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730883496] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 14:50:05,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962095418] [2021-12-14 14:50:05,090 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-14 14:50:05,090 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:05,090 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:50:05,104 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 14:50:05,105 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 14:50:05,157 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-12-14 14:50:05,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 14:50:05,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 16 conjunts are in the unsatisfiable core [2021-12-14 14:50:05,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 14:50:05,271 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-12-14 14:50:05,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 14:50:06,316 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-14 14:50:06,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962095418] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 14:50:06,317 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 14:50:06,317 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 17] total 21 [2021-12-14 14:50:06,317 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441067827] [2021-12-14 14:50:06,317 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 14:50:06,318 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-14 14:50:06,318 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 14:50:06,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-14 14:50:06,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=302, Unknown=0, NotChecked=0, Total=420 [2021-12-14 14:50:06,319 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 21 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 21 states have internal predecessors, (40), 10 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (20), 7 states have call predecessors, (20), 10 states have call successors, (20) [2021-12-14 14:50:06,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 14:50:06,402 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2021-12-14 14:50:06,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-14 14:50:06,402 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 21 states have internal predecessors, (40), 10 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (20), 7 states have call predecessors, (20), 10 states have call successors, (20) Word has length 46 [2021-12-14 14:50:06,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 14:50:06,405 INFO L225 Difference]: With dead ends: 37 [2021-12-14 14:50:06,405 INFO L226 Difference]: Without dead ends: 33 [2021-12-14 14:50:06,405 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=245, Invalid=511, Unknown=0, NotChecked=0, Total=756 [2021-12-14 14:50:06,406 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 83 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 14:50:06,406 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 69 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 14:50:06,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-12-14 14:50:06,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-12-14 14:50:06,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 23 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 8 states have return successors, (9), 8 states have call predecessors, (9), 2 states have call successors, (9) [2021-12-14 14:50:06,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-12-14 14:50:06,418 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 46 [2021-12-14 14:50:06,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 14:50:06,418 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-12-14 14:50:06,420 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 21 states have internal predecessors, (40), 10 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (20), 7 states have call predecessors, (20), 10 states have call successors, (20) [2021-12-14 14:50:06,420 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-12-14 14:50:06,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-12-14 14:50:06,425 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:50:06,425 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:50:06,442 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 14:50:06,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:06,640 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:50:06,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:50:06,640 INFO L85 PathProgramCache]: Analyzing trace with hash -626238314, now seen corresponding path program 7 times [2021-12-14 14:50:06,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:50:06,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892138113] [2021-12-14 14:50:06,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:06,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:50:06,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:06,662 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:06,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:06,682 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:06,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:06,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:06,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:06,720 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:06,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:06,735 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:06,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:06,747 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:06,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:06,762 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:06,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:06,784 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:06,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:06,795 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-12-14 14:50:06,795 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:06,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892138113] [2021-12-14 14:50:06,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1892138113] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 14:50:06,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50442272] [2021-12-14 14:50:06,796 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-14 14:50:06,796 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:06,796 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:50:06,797 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 14:50:06,810 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 14:50:06,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:06,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-14 14:50:06,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 14:50:06,976 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-12-14 14:50:06,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 14:50:08,397 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-14 14:50:08,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [50442272] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 14:50:08,398 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 14:50:08,398 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 23 [2021-12-14 14:50:08,398 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814653737] [2021-12-14 14:50:08,398 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 14:50:08,398 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-14 14:50:08,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 14:50:08,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-14 14:50:08,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=365, Unknown=0, NotChecked=0, Total=506 [2021-12-14 14:50:08,399 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 23 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 23 states have internal predecessors, (44), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (23), 8 states have call predecessors, (23), 11 states have call successors, (23) [2021-12-14 14:50:08,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 14:50:08,472 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2021-12-14 14:50:08,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-14 14:50:08,472 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 23 states have internal predecessors, (44), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (23), 8 states have call predecessors, (23), 11 states have call successors, (23) Word has length 52 [2021-12-14 14:50:08,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 14:50:08,474 INFO L225 Difference]: With dead ends: 40 [2021-12-14 14:50:08,474 INFO L226 Difference]: Without dead ends: 36 [2021-12-14 14:50:08,475 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=302, Invalid=628, Unknown=0, NotChecked=0, Total=930 [2021-12-14 14:50:08,475 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 43 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 14:50:08,475 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 78 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 14:50:08,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-12-14 14:50:08,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-12-14 14:50:08,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 25 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 9 states have return successors, (10), 9 states have call predecessors, (10), 2 states have call successors, (10) [2021-12-14 14:50:08,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-12-14 14:50:08,483 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 52 [2021-12-14 14:50:08,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 14:50:08,483 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-12-14 14:50:08,483 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 23 states have internal predecessors, (44), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (23), 8 states have call predecessors, (23), 11 states have call successors, (23) [2021-12-14 14:50:08,484 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-12-14 14:50:08,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-12-14 14:50:08,485 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:50:08,486 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:50:08,519 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 14:50:08,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:08,695 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:50:08,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:50:08,696 INFO L85 PathProgramCache]: Analyzing trace with hash -960511412, now seen corresponding path program 8 times [2021-12-14 14:50:08,696 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:50:08,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843182613] [2021-12-14 14:50:08,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:08,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:50:08,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:08,716 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:08,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:08,736 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:08,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:08,753 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:08,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:08,770 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:08,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:08,783 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:08,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:08,794 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:08,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:08,806 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:08,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:08,819 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:08,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:08,830 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:08,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:08,843 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-12-14 14:50:08,843 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:08,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843182613] [2021-12-14 14:50:08,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1843182613] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 14:50:08,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396856436] [2021-12-14 14:50:08,843 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 14:50:08,843 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:08,844 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:50:08,844 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 14:50:08,845 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 14:50:08,938 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 14:50:08,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 14:50:08,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-14 14:50:08,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 14:50:09,063 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-12-14 14:50:09,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 14:50:11,021 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-12-14 14:50:11,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396856436] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 14:50:11,022 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 14:50:11,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 21] total 25 [2021-12-14 14:50:11,022 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201086435] [2021-12-14 14:50:11,022 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 14:50:11,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-12-14 14:50:11,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 14:50:11,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-12-14 14:50:11,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=434, Unknown=0, NotChecked=0, Total=600 [2021-12-14 14:50:11,024 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 25 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 25 states have internal predecessors, (48), 12 states have call successors, (12), 1 states have call predecessors, (12), 10 states have return successors, (26), 9 states have call predecessors, (26), 12 states have call successors, (26) [2021-12-14 14:50:11,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 14:50:11,113 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2021-12-14 14:50:11,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-14 14:50:11,114 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 25 states have internal predecessors, (48), 12 states have call successors, (12), 1 states have call predecessors, (12), 10 states have return successors, (26), 9 states have call predecessors, (26), 12 states have call successors, (26) Word has length 58 [2021-12-14 14:50:11,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 14:50:11,115 INFO L225 Difference]: With dead ends: 43 [2021-12-14 14:50:11,115 INFO L226 Difference]: Without dead ends: 39 [2021-12-14 14:50:11,116 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=365, Invalid=757, Unknown=0, NotChecked=0, Total=1122 [2021-12-14 14:50:11,117 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 47 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 14:50:11,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 88 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 14:50:11,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-12-14 14:50:11,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-12-14 14:50:11,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 27 states have internal predecessors, (27), 2 states have call successors, (2), 1 states have call predecessors, (2), 10 states have return successors, (11), 10 states have call predecessors, (11), 2 states have call successors, (11) [2021-12-14 14:50:11,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-12-14 14:50:11,123 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 58 [2021-12-14 14:50:11,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 14:50:11,124 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-12-14 14:50:11,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 25 states have internal predecessors, (48), 12 states have call successors, (12), 1 states have call predecessors, (12), 10 states have return successors, (26), 9 states have call predecessors, (26), 12 states have call successors, (26) [2021-12-14 14:50:11,124 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-12-14 14:50:11,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-12-14 14:50:11,125 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:50:11,125 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:50:11,142 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-14 14:50:11,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-12-14 14:50:11,332 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:50:11,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:50:11,332 INFO L85 PathProgramCache]: Analyzing trace with hash -366706730, now seen corresponding path program 9 times [2021-12-14 14:50:11,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:50:11,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1423192669] [2021-12-14 14:50:11,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:11,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:50:11,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:11,358 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:11,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:11,381 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:11,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:11,399 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:11,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:11,417 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:11,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:11,430 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:11,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:11,452 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:11,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:11,465 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:11,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:11,482 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:11,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:11,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:11,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:11,506 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:11,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:11,520 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-12-14 14:50:11,520 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:11,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1423192669] [2021-12-14 14:50:11,520 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1423192669] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 14:50:11,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435831656] [2021-12-14 14:50:11,520 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 14:50:11,521 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:11,521 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:50:11,521 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 14:50:11,522 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-14 14:50:11,643 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-12-14 14:50:11,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 14:50:11,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 22 conjunts are in the unsatisfiable core [2021-12-14 14:50:11,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 14:50:11,761 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-12-14 14:50:11,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 14:50:14,250 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-12-14 14:50:14,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1435831656] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 14:50:14,250 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 14:50:14,251 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 27 [2021-12-14 14:50:14,251 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521169120] [2021-12-14 14:50:14,251 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 14:50:14,251 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-14 14:50:14,251 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 14:50:14,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-14 14:50:14,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=509, Unknown=0, NotChecked=0, Total=702 [2021-12-14 14:50:14,252 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 27 states, 25 states have (on average 2.08) internal successors, (52), 27 states have internal predecessors, (52), 13 states have call successors, (13), 1 states have call predecessors, (13), 11 states have return successors, (29), 10 states have call predecessors, (29), 13 states have call successors, (29) [2021-12-14 14:50:14,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 14:50:14,365 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2021-12-14 14:50:14,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-12-14 14:50:14,366 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 2.08) internal successors, (52), 27 states have internal predecessors, (52), 13 states have call successors, (13), 1 states have call predecessors, (13), 11 states have return successors, (29), 10 states have call predecessors, (29), 13 states have call successors, (29) Word has length 64 [2021-12-14 14:50:14,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 14:50:14,367 INFO L225 Difference]: With dead ends: 46 [2021-12-14 14:50:14,367 INFO L226 Difference]: Without dead ends: 42 [2021-12-14 14:50:14,367 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=434, Invalid=898, Unknown=0, NotChecked=0, Total=1332 [2021-12-14 14:50:14,368 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 136 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 14:50:14,368 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 85 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 14:50:14,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-12-14 14:50:14,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-12-14 14:50:14,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 29 states have internal predecessors, (29), 2 states have call successors, (2), 1 states have call predecessors, (2), 11 states have return successors, (12), 11 states have call predecessors, (12), 2 states have call successors, (12) [2021-12-14 14:50:14,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2021-12-14 14:50:14,371 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 64 [2021-12-14 14:50:14,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 14:50:14,371 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2021-12-14 14:50:14,371 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 2.08) internal successors, (52), 27 states have internal predecessors, (52), 13 states have call successors, (13), 1 states have call predecessors, (13), 11 states have return successors, (29), 10 states have call predecessors, (29), 13 states have call successors, (29) [2021-12-14 14:50:14,371 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2021-12-14 14:50:14,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-12-14 14:50:14,372 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:50:14,372 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:50:14,390 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-12-14 14:50:14,577 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-14 14:50:14,577 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:50:14,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:50:14,577 INFO L85 PathProgramCache]: Analyzing trace with hash -1719425780, now seen corresponding path program 10 times [2021-12-14 14:50:14,577 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:50:14,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [194800204] [2021-12-14 14:50:14,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:14,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:50:14,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:14,599 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:14,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:14,619 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:14,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:14,634 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:14,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:14,650 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:14,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:14,665 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:14,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:14,682 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:14,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:14,695 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:14,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:14,708 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:14,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:14,723 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:14,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:14,740 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:14,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:14,754 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:14,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:14,766 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-12-14 14:50:14,766 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:14,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [194800204] [2021-12-14 14:50:14,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [194800204] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 14:50:14,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2027533132] [2021-12-14 14:50:14,767 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-14 14:50:14,767 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:14,767 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:50:14,768 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 14:50:14,794 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-14 14:50:14,941 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-14 14:50:14,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 14:50:14,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-14 14:50:14,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 14:50:15,114 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-12-14 14:50:15,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 14:50:18,343 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-12-14 14:50:18,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2027533132] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 14:50:18,343 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 14:50:18,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 25] total 29 [2021-12-14 14:50:18,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580529928] [2021-12-14 14:50:18,343 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 14:50:18,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-12-14 14:50:18,344 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 14:50:18,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-12-14 14:50:18,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=590, Unknown=0, NotChecked=0, Total=812 [2021-12-14 14:50:18,345 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 29 states, 27 states have (on average 2.074074074074074) internal successors, (56), 29 states have internal predecessors, (56), 14 states have call successors, (14), 1 states have call predecessors, (14), 12 states have return successors, (32), 11 states have call predecessors, (32), 14 states have call successors, (32) [2021-12-14 14:50:18,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 14:50:18,475 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2021-12-14 14:50:18,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-14 14:50:18,476 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 27 states have (on average 2.074074074074074) internal successors, (56), 29 states have internal predecessors, (56), 14 states have call successors, (14), 1 states have call predecessors, (14), 12 states have return successors, (32), 11 states have call predecessors, (32), 14 states have call successors, (32) Word has length 70 [2021-12-14 14:50:18,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 14:50:18,476 INFO L225 Difference]: With dead ends: 49 [2021-12-14 14:50:18,476 INFO L226 Difference]: Without dead ends: 45 [2021-12-14 14:50:18,477 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=509, Invalid=1051, Unknown=0, NotChecked=0, Total=1560 [2021-12-14 14:50:18,477 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 76 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 14:50:18,478 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 99 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-14 14:50:18,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-12-14 14:50:18,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-12-14 14:50:18,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 31 states have internal predecessors, (31), 2 states have call successors, (2), 1 states have call predecessors, (2), 12 states have return successors, (13), 12 states have call predecessors, (13), 2 states have call successors, (13) [2021-12-14 14:50:18,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2021-12-14 14:50:18,485 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 70 [2021-12-14 14:50:18,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 14:50:18,486 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2021-12-14 14:50:18,486 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 27 states have (on average 2.074074074074074) internal successors, (56), 29 states have internal predecessors, (56), 14 states have call successors, (14), 1 states have call predecessors, (14), 12 states have return successors, (32), 11 states have call predecessors, (32), 14 states have call successors, (32) [2021-12-14 14:50:18,486 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2021-12-14 14:50:18,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-12-14 14:50:18,487 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:50:18,487 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:50:18,509 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-12-14 14:50:18,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-12-14 14:50:18,709 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:50:18,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:50:18,710 INFO L85 PathProgramCache]: Analyzing trace with hash 1354232598, now seen corresponding path program 11 times [2021-12-14 14:50:18,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:50:18,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1865423661] [2021-12-14 14:50:18,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:18,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:50:18,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:18,732 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:18,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:18,753 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:18,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:18,769 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:18,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:18,792 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:18,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:18,808 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:18,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:18,824 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:18,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:18,838 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:18,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:18,850 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:18,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:18,862 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:18,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:18,874 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:18,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:18,887 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:18,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:18,899 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:18,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:18,912 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-12-14 14:50:18,912 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:18,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1865423661] [2021-12-14 14:50:18,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1865423661] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 14:50:18,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [740577728] [2021-12-14 14:50:18,913 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-14 14:50:18,913 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:18,913 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:50:18,915 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 14:50:18,917 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-14 14:50:19,185 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-12-14 14:50:19,186 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 14:50:19,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-14 14:50:19,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 14:50:19,305 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-12-14 14:50:19,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 14:50:23,286 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-12-14 14:50:23,286 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [740577728] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 14:50:23,287 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 14:50:23,287 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 27] total 31 [2021-12-14 14:50:23,287 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373655052] [2021-12-14 14:50:23,287 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 14:50:23,288 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-12-14 14:50:23,288 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 14:50:23,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-12-14 14:50:23,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=677, Unknown=0, NotChecked=0, Total=930 [2021-12-14 14:50:23,289 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand has 31 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 31 states have internal predecessors, (60), 15 states have call successors, (15), 1 states have call predecessors, (15), 13 states have return successors, (35), 12 states have call predecessors, (35), 15 states have call successors, (35) [2021-12-14 14:50:23,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 14:50:23,451 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2021-12-14 14:50:23,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-12-14 14:50:23,458 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 31 states have internal predecessors, (60), 15 states have call successors, (15), 1 states have call predecessors, (15), 13 states have return successors, (35), 12 states have call predecessors, (35), 15 states have call successors, (35) Word has length 76 [2021-12-14 14:50:23,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 14:50:23,458 INFO L225 Difference]: With dead ends: 52 [2021-12-14 14:50:23,458 INFO L226 Difference]: Without dead ends: 48 [2021-12-14 14:50:23,459 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=590, Invalid=1216, Unknown=0, NotChecked=0, Total=1806 [2021-12-14 14:50:23,459 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 213 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 14:50:23,460 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [227 Valid, 116 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-14 14:50:23,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-12-14 14:50:23,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-12-14 14:50:23,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 32 states have (on average 1.03125) internal successors, (33), 33 states have internal predecessors, (33), 2 states have call successors, (2), 1 states have call predecessors, (2), 13 states have return successors, (14), 13 states have call predecessors, (14), 2 states have call successors, (14) [2021-12-14 14:50:23,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2021-12-14 14:50:23,462 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 76 [2021-12-14 14:50:23,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 14:50:23,463 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2021-12-14 14:50:23,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 31 states have internal predecessors, (60), 15 states have call successors, (15), 1 states have call predecessors, (15), 13 states have return successors, (35), 12 states have call predecessors, (35), 15 states have call successors, (35) [2021-12-14 14:50:23,463 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2021-12-14 14:50:23,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-12-14 14:50:23,463 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:50:23,464 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:50:23,496 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-12-14 14:50:23,679 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-12-14 14:50:23,679 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:50:23,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:50:23,680 INFO L85 PathProgramCache]: Analyzing trace with hash 1734686668, now seen corresponding path program 12 times [2021-12-14 14:50:23,680 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:50:23,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [188176565] [2021-12-14 14:50:23,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:23,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:50:23,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:23,701 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:23,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:23,719 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:23,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:23,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:23,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:23,753 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:23,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:23,767 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:23,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:23,781 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:23,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:23,794 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:23,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:23,807 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:23,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:23,819 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:23,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:23,832 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:23,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:23,845 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:23,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:23,858 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:23,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:23,870 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:23,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:23,883 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-12-14 14:50:23,884 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:23,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [188176565] [2021-12-14 14:50:23,884 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [188176565] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 14:50:23,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [83670057] [2021-12-14 14:50:23,884 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-14 14:50:23,884 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:23,884 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:50:23,885 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 14:50:23,886 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-14 14:50:24,199 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-12-14 14:50:24,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 14:50:24,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 28 conjunts are in the unsatisfiable core [2021-12-14 14:50:24,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 14:50:24,383 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-12-14 14:50:24,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 14:50:29,460 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-12-14 14:50:29,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [83670057] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 14:50:29,460 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 14:50:29,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 29] total 33 [2021-12-14 14:50:29,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140841755] [2021-12-14 14:50:29,461 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 14:50:29,461 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-12-14 14:50:29,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 14:50:29,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-12-14 14:50:29,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=770, Unknown=0, NotChecked=0, Total=1056 [2021-12-14 14:50:29,462 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 33 states, 31 states have (on average 2.064516129032258) internal successors, (64), 33 states have internal predecessors, (64), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (38), 13 states have call predecessors, (38), 16 states have call successors, (38) [2021-12-14 14:50:29,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 14:50:29,604 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2021-12-14 14:50:29,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-12-14 14:50:29,605 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 2.064516129032258) internal successors, (64), 33 states have internal predecessors, (64), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (38), 13 states have call predecessors, (38), 16 states have call successors, (38) Word has length 82 [2021-12-14 14:50:29,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 14:50:29,605 INFO L225 Difference]: With dead ends: 55 [2021-12-14 14:50:29,605 INFO L226 Difference]: Without dead ends: 51 [2021-12-14 14:50:29,606 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 533 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=677, Invalid=1393, Unknown=0, NotChecked=0, Total=2070 [2021-12-14 14:50:29,606 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 32 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 14:50:29,607 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 121 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 14:50:29,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-12-14 14:50:29,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-12-14 14:50:29,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 35 states have internal predecessors, (35), 2 states have call successors, (2), 1 states have call predecessors, (2), 14 states have return successors, (15), 14 states have call predecessors, (15), 2 states have call successors, (15) [2021-12-14 14:50:29,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2021-12-14 14:50:29,610 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 82 [2021-12-14 14:50:29,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 14:50:29,610 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2021-12-14 14:50:29,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 2.064516129032258) internal successors, (64), 33 states have internal predecessors, (64), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (38), 13 states have call predecessors, (38), 16 states have call successors, (38) [2021-12-14 14:50:29,610 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2021-12-14 14:50:29,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-12-14 14:50:29,611 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:50:29,611 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:50:29,631 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-12-14 14:50:29,829 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-12-14 14:50:29,830 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:50:29,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:50:29,830 INFO L85 PathProgramCache]: Analyzing trace with hash -1433749930, now seen corresponding path program 13 times [2021-12-14 14:50:29,830 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:50:29,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1016918401] [2021-12-14 14:50:29,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:29,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:50:29,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:29,856 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:29,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:29,878 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:29,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:29,896 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:29,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:29,913 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:29,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:29,928 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:29,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:29,942 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:29,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:29,956 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:29,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:29,990 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:29,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:30,008 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:30,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:30,028 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:30,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:30,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:30,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:30,068 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:30,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:30,082 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:30,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:30,096 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:30,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:30,112 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-12-14 14:50:30,112 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:30,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1016918401] [2021-12-14 14:50:30,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1016918401] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 14:50:30,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758439029] [2021-12-14 14:50:30,113 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-14 14:50:30,113 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:30,113 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:50:30,124 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 14:50:30,126 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-14 14:50:30,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:30,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 30 conjunts are in the unsatisfiable core [2021-12-14 14:50:30,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 14:50:30,755 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-12-14 14:50:30,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 14:50:36,991 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-12-14 14:50:36,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [758439029] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 14:50:36,991 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 14:50:36,991 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 31] total 35 [2021-12-14 14:50:36,991 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256579065] [2021-12-14 14:50:36,991 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 14:50:36,992 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-12-14 14:50:36,992 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 14:50:36,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-12-14 14:50:37,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=869, Unknown=0, NotChecked=0, Total=1190 [2021-12-14 14:50:37,008 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 35 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 35 states have internal predecessors, (68), 17 states have call successors, (17), 1 states have call predecessors, (17), 15 states have return successors, (41), 14 states have call predecessors, (41), 17 states have call successors, (41) [2021-12-14 14:50:37,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 14:50:37,143 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2021-12-14 14:50:37,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-12-14 14:50:37,143 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 35 states have internal predecessors, (68), 17 states have call successors, (17), 1 states have call predecessors, (17), 15 states have return successors, (41), 14 states have call predecessors, (41), 17 states have call successors, (41) Word has length 88 [2021-12-14 14:50:37,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 14:50:37,144 INFO L225 Difference]: With dead ends: 58 [2021-12-14 14:50:37,144 INFO L226 Difference]: Without dead ends: 54 [2021-12-14 14:50:37,144 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 616 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=770, Invalid=1582, Unknown=0, NotChecked=0, Total=2352 [2021-12-14 14:50:37,145 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 64 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 14:50:37,145 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 135 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 14:50:37,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-12-14 14:50:37,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-12-14 14:50:37,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 37 states have internal predecessors, (37), 2 states have call successors, (2), 1 states have call predecessors, (2), 15 states have return successors, (16), 15 states have call predecessors, (16), 2 states have call successors, (16) [2021-12-14 14:50:37,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-12-14 14:50:37,148 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 88 [2021-12-14 14:50:37,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 14:50:37,148 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-12-14 14:50:37,148 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 35 states have internal predecessors, (68), 17 states have call successors, (17), 1 states have call predecessors, (17), 15 states have return successors, (41), 14 states have call predecessors, (41), 17 states have call successors, (41) [2021-12-14 14:50:37,148 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-12-14 14:50:37,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-12-14 14:50:37,149 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:50:37,149 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:50:37,167 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-14 14:50:37,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-12-14 14:50:37,368 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:50:37,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:50:37,368 INFO L85 PathProgramCache]: Analyzing trace with hash -1321174388, now seen corresponding path program 14 times [2021-12-14 14:50:37,368 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:50:37,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1835832272] [2021-12-14 14:50:37,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:37,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:50:37,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:37,404 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:37,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:37,426 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:37,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:37,443 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:37,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:37,460 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:37,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:37,479 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:37,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:37,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:37,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:37,508 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:37,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:37,522 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:37,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:37,541 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:37,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:37,554 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:37,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:37,568 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:37,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:37,581 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:37,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:37,608 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:37,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:37,622 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:37,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:37,637 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:37,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:37,654 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2021-12-14 14:50:37,654 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:37,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1835832272] [2021-12-14 14:50:37,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1835832272] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 14:50:37,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [654193159] [2021-12-14 14:50:37,655 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-14 14:50:37,655 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:37,655 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:50:37,656 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 14:50:37,657 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-14 14:50:38,142 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-14 14:50:38,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 14:50:38,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2021-12-14 14:50:38,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 14:50:38,300 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2021-12-14 14:50:38,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 14:50:46,026 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-12-14 14:50:46,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [654193159] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 14:50:46,027 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 14:50:46,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 33] total 37 [2021-12-14 14:50:46,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748435237] [2021-12-14 14:50:46,027 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 14:50:46,028 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-12-14 14:50:46,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 14:50:46,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-12-14 14:50:46,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=974, Unknown=0, NotChecked=0, Total=1332 [2021-12-14 14:50:46,030 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 37 states, 35 states have (on average 2.057142857142857) internal successors, (72), 37 states have internal predecessors, (72), 18 states have call successors, (18), 1 states have call predecessors, (18), 16 states have return successors, (44), 15 states have call predecessors, (44), 18 states have call successors, (44) [2021-12-14 14:50:46,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 14:50:46,171 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2021-12-14 14:50:46,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-14 14:50:46,172 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 35 states have (on average 2.057142857142857) internal successors, (72), 37 states have internal predecessors, (72), 18 states have call successors, (18), 1 states have call predecessors, (18), 16 states have return successors, (44), 15 states have call predecessors, (44), 18 states have call successors, (44) Word has length 94 [2021-12-14 14:50:46,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 14:50:46,173 INFO L225 Difference]: With dead ends: 61 [2021-12-14 14:50:46,173 INFO L226 Difference]: Without dead ends: 57 [2021-12-14 14:50:46,177 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 199 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 705 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=869, Invalid=1783, Unknown=0, NotChecked=0, Total=2652 [2021-12-14 14:50:46,179 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 71 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-14 14:50:46,180 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 132 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-14 14:50:46,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-12-14 14:50:46,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-12-14 14:50:46,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 39 states have internal predecessors, (39), 2 states have call successors, (2), 1 states have call predecessors, (2), 16 states have return successors, (17), 16 states have call predecessors, (17), 2 states have call successors, (17) [2021-12-14 14:50:46,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2021-12-14 14:50:46,197 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 94 [2021-12-14 14:50:46,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 14:50:46,197 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2021-12-14 14:50:46,197 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 35 states have (on average 2.057142857142857) internal successors, (72), 37 states have internal predecessors, (72), 18 states have call successors, (18), 1 states have call predecessors, (18), 16 states have return successors, (44), 15 states have call predecessors, (44), 18 states have call successors, (44) [2021-12-14 14:50:46,197 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2021-12-14 14:50:46,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-12-14 14:50:46,199 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:50:46,199 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:50:46,217 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-12-14 14:50:46,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:46,418 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:50:46,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:50:46,418 INFO L85 PathProgramCache]: Analyzing trace with hash 415287702, now seen corresponding path program 15 times [2021-12-14 14:50:46,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:50:46,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129867744] [2021-12-14 14:50:46,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:46,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:50:46,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,459 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:46,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,487 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:46,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,525 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:46,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,547 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:46,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,567 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:46,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,588 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:46,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,610 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:46,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,630 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:46,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,654 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:46,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,671 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:46,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,687 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:46,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,704 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:46,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,718 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:46,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,733 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:46,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,748 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:46,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,763 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:46,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:46,777 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-12-14 14:50:46,778 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:46,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129867744] [2021-12-14 14:50:46,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [129867744] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 14:50:46,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [887669904] [2021-12-14 14:50:46,778 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-14 14:50:46,779 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:46,779 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:50:46,796 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 14:50:46,835 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-14 14:50:47,535 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-12-14 14:50:47,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 14:50:47,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 34 conjunts are in the unsatisfiable core [2021-12-14 14:50:47,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 14:50:47,729 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2021-12-14 14:50:47,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-14 14:50:57,192 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-12-14 14:50:57,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [887669904] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-14 14:50:57,192 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-14 14:50:57,193 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 35] total 39 [2021-12-14 14:50:57,193 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044696481] [2021-12-14 14:50:57,193 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-14 14:50:57,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-12-14 14:50:57,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-14 14:50:57,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-12-14 14:50:57,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1085, Unknown=0, NotChecked=0, Total=1482 [2021-12-14 14:50:57,194 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand has 39 states, 37 states have (on average 2.054054054054054) internal successors, (76), 39 states have internal predecessors, (76), 19 states have call successors, (19), 1 states have call predecessors, (19), 17 states have return successors, (47), 16 states have call predecessors, (47), 19 states have call successors, (47) [2021-12-14 14:50:57,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-14 14:50:57,402 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2021-12-14 14:50:57,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-12-14 14:50:57,402 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 37 states have (on average 2.054054054054054) internal successors, (76), 39 states have internal predecessors, (76), 19 states have call successors, (19), 1 states have call predecessors, (19), 17 states have return successors, (47), 16 states have call predecessors, (47), 19 states have call successors, (47) Word has length 100 [2021-12-14 14:50:57,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-14 14:50:57,403 INFO L225 Difference]: With dead ends: 64 [2021-12-14 14:50:57,403 INFO L226 Difference]: Without dead ends: 60 [2021-12-14 14:50:57,404 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 212 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 800 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=974, Invalid=1996, Unknown=0, NotChecked=0, Total=2970 [2021-12-14 14:50:57,404 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 406 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 190 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 424 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 190 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-14 14:50:57,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [424 Valid, 139 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [190 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-14 14:50:57,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-12-14 14:50:57,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-12-14 14:50:57,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 40 states have (on average 1.025) internal successors, (41), 41 states have internal predecessors, (41), 2 states have call successors, (2), 1 states have call predecessors, (2), 17 states have return successors, (18), 17 states have call predecessors, (18), 2 states have call successors, (18) [2021-12-14 14:50:57,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2021-12-14 14:50:57,407 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 100 [2021-12-14 14:50:57,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-14 14:50:57,407 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2021-12-14 14:50:57,408 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 37 states have (on average 2.054054054054054) internal successors, (76), 39 states have internal predecessors, (76), 19 states have call successors, (19), 1 states have call predecessors, (19), 17 states have return successors, (47), 16 states have call predecessors, (47), 19 states have call successors, (47) [2021-12-14 14:50:57,408 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2021-12-14 14:50:57,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-12-14 14:50:57,408 INFO L506 BasicCegarLoop]: Found error trace [2021-12-14 14:50:57,408 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-14 14:50:57,428 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-12-14 14:50:57,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-12-14 14:50:57,615 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-14 14:50:57,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-14 14:50:57,616 INFO L85 PathProgramCache]: Analyzing trace with hash 317812044, now seen corresponding path program 16 times [2021-12-14 14:50:57,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-14 14:50:57,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217966346] [2021-12-14 14:50:57,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-14 14:50:57,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-14 14:50:57,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,646 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,665 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,683 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,715 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,732 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,762 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,777 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,792 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,806 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,822 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,847 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,861 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,874 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,889 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,902 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,915 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-14 14:50:57,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-14 14:50:57,930 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-12-14 14:50:57,930 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-14 14:50:57,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217966346] [2021-12-14 14:50:57,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1217966346] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-14 14:50:57,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1053223596] [2021-12-14 14:50:57,930 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-14 14:50:57,930 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-14 14:50:57,931 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-14 14:50:57,931 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-14 14:50:57,932 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-14 14:50:58,686 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-14 14:50:58,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-14 14:50:58,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 36 conjunts are in the unsatisfiable core [2021-12-14 14:50:58,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-14 14:50:58,865 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-12-14 14:50:58,866 INFO L328 TraceCheckSpWp]: Computing backward predicates...